Re: [PATCH] Revert "drm/display/dp_mst: Move all payload info into the atomic state"

13 Jan 2023

On Fri, Jan 13, 2023 at 12:16:57PM +0200, Jani Nikula wrote:
...
Cc: intel-gfx, drm maintainers
Please have the courtesy of Cc'ing us for changes impacting us, and
maybe try to involve us earlier instead of surprising us like
this. Looks like this has been debugged for at least three months, and
the huge revert at this point is going to set us back with what's been
developed on top of it for i915 DP MST and DSC.
tbf I assumed this wont land when I've seen it fly by. It feels a bit much
like living under a rock for half a year and then creating a mess for
everyone else who's been building on top of this is not great.
Like yes it's a regression, but apparently not a blantantly obvious one,
and I think if we just ram this in there's considerable community goodwill
down the drain. Someone needs to get that goodwill up the drain again.
...
It's a regression, I get that, but this is also going to be really nasty
to deal with. It's a 2500-line commit, plus the dependencies, which I
don't think are accounted for here. (What's the baseline for the revert
anyway?) I don't expect all the dependent commits to be easy to revert
or backport to v6.1 or v6.2.
*sad trombone*
Yeah that's the other thing. 2500 patch revert is not cc stable material.
So this isn't even really helping users all that much.
Unless it also comes with full amounts of backports of the reverts on all
affected drivers for all curent stable trees, fully validated.
This is bad. I do think we need to have some understanding first of what
"fix this in amdgpu" would look like as plan B. Because plan A does not
look like a happy one at all.
-Daniel
...
BR,
Jani.
On Thu, 12 Jan 2023, Wayne Lin Wayne.Lin@amd.com wrote:
...
This reverts commit 4d07b0bc403403438d9cf88450506240c5faf92f.
[Why]
Changes cause regression on amdgpu mst.
E.g.
In fill_dc_mst_payload_table_from_drm(), amdgpu expects to add/remove payload
one by one and call fill_dc_mst_payload_table_from_drm() to update the HW
maintained payload table. But previous change tries to go through all the
payloads in mst_state and update amdpug hw maintained table in once everytime
driver only tries to add/remove a specific payload stream only. The newly
design idea conflicts with the implementation in amdgpu nowadays.
[How]
Revert this patch first. After addressing all regression problems caused by
this previous patch, will add it back and adjust it.
Signed-off-by: Wayne Lin Wayne.Lin@amd.com
Link: https://gitlab.freedesktop.org/drm/amd/-/issues/2171
Cc: stable@vger.kernel.org # 6.1
Cc: Lyude Paul lyude@redhat.com
Cc: Harry Wentland harry.wentland@amd.com
Cc: Mario Limonciello mario.limonciello@amd.com
Cc: Ville Syrjälä ville.syrjala@linux.intel.com
Cc: Ben Skeggs bskeggs@redhat.com
Cc: Stanislav Lisovskiy stanislav.lisovskiy@intel.com
Cc: Fangzhi Zuo Jerry.Zuo@amd.com

.../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |  53 +-
 .../amd/display/amdgpu_dm/amdgpu_dm_helpers.c | 106 ++-
 .../display/amdgpu_dm/amdgpu_dm_mst_types.c   |  87 ++-
 .../amd/display/include/link_service_types.h  |   3 -
 drivers/gpu/drm/display/drm_dp_mst_topology.c | 724 ++++++++++++------
 drivers/gpu/drm/i915/display/intel_dp_mst.c   |  67 +-
 drivers/gpu/drm/i915/display/intel_hdcp.c     |  24 +-
 drivers/gpu/drm/nouveau/dispnv50/disp.c       | 167 ++--
 include/drm/display/drm_dp_mst_helper.h       | 177 +++--
 9 files changed, 878 insertions(+), 530 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 77277d90b6e2..674f5dc1102b 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -6548,7 +6548,6 @@ static int dm_encoder_helper_atomic_check(struct drm_encoder *encoder,
   const struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
   struct drm_dp_mst_topology_mgr *mst_mgr;
   struct drm_dp_mst_port *mst_port;

struct drm_dp_mst_topology_state *mst_state;
enum dc_color_depth color_depth;
int clock, bpp = 0;
bool is_y420 = false;

@@ -6562,13 +6561,6 @@ static int dm_encoder_helper_atomic_check(struct drm_encoder *encoder,
   if (!crtc_state->connectors_changed && !crtc_state->mode_changed)
   	return 0;

mst_state = drm_atomic_get_mst_topology_state(state, mst_mgr);
if (IS_ERR(mst_state))
return PTR_ERR(mst_state);



if (!mst_state->pbn_div)
mst_state->pbn_div = dm_mst_get_pbn_divider(aconnector->mst_port->dc_link);


if (!state->duplicated) {
  int max_bpc = conn_state->max_requested_bpc;
  is_y420 = drm_mode_is_420_also(&connector->display_info, adjusted_mode) &&

@@ -6580,10 +6572,11 @@ static int dm_encoder_helper_atomic_check(struct drm_encoder *encoder,
   	clock = adjusted_mode->clock;
   	dm_new_connector_state->pbn = drm_dp_calc_pbn_mode(clock, bpp, false);
   }


dm_new_connector_state->vcpi_slots =
drm_dp_atomic_find_time_slots(state, mst_mgr, mst_port,


			      dm_new_connector_state->pbn);




dm_new_connector_state->vcpi_slots = drm_dp_atomic_find_time_slots(state,
							   mst_mgr,


							   mst_port,


							   dm_new_connector_state->pbn,


							   dm_mst_get_pbn_divider(aconnector->dc_link));

if (dm_new_connector_state->vcpi_slots < 0) {
DRM_DEBUG_ATOMIC("failed finding vcpi slots: %d\n", (int)dm_new_connector_state->vcpi_slots);
return dm_new_connector_state->vcpi_slots;

@@ -6654,14 +6647,17 @@ static int dm_update_mst_vcpi_slots_for_dsc(struct drm_atomic_state *state,
   		dm_conn_state->vcpi_slots = slot_num;
 
   		ret = drm_dp_mst_atomic_enable_dsc(state, aconnector->port,

					   dm_conn_state->pbn, false);




					   dm_conn_state->pbn, 0, false);
if (ret < 0)
	return ret;



continue;
   	}

vcpi = drm_dp_mst_atomic_enable_dsc(state, aconnector->port, pbn, true);




vcpi = drm_dp_mst_atomic_enable_dsc(state,


				    aconnector->port,


				    pbn, pbn_div,


				    true);

if (vcpi < 0)
	return vcpi;

@@ -9497,6 +9493,8 @@ static int amdgpu_dm_atomic_check(struct drm_device *dev,
   struct dm_crtc_state *dm_old_crtc_state, *dm_new_crtc_state;
 #if defined(CONFIG_DRM_AMD_DC_DCN)
   struct dsc_mst_fairness_vars vars[MAX_PIPES];

struct drm_dp_mst_topology_state *mst_state;
struct drm_dp_mst_topology_mgr *mgr;

#endif
 
   trace_amdgpu_dm_atomic_check_begin(state);
@@ -9744,6 +9742,33 @@ static int amdgpu_dm_atomic_check(struct drm_device *dev,
   	lock_and_validation_needed = true;
   }
 
+#if defined(CONFIG_DRM_AMD_DC_DCN)

/* set the slot info for each mst_state based on the link encoding format */
for_each_new_mst_mgr_in_state(state, mgr, mst_state, i) {
struct amdgpu_dm_connector *aconnector;


struct drm_connector *connector;


struct drm_connector_list_iter iter;


u8 link_coding_cap;



if (!mgr->mst_state )


	continue;



drm_connector_list_iter_begin(dev, &iter);


drm_for_each_connector_iter(connector, &iter) {


	int id = connector->index;



	if (id == mst_state->mgr->conn_base_id) {


		aconnector = to_amdgpu_dm_connector(connector);


		link_coding_cap = dc_link_dp_mst_decide_link_encoding_format(aconnector->dc_link);


		drm_dp_mst_update_slots(mst_state, link_coding_cap);



		break;


	}


}


drm_connector_list_iter_end(&iter);



}

+#endif
   /**
    * Streams and planes are reset when there are changes that affect
    * bandwidth. Anything that affects bandwidth needs to go through
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
index 6994c9a1ed85..ac5a8cad0695 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
@@ -27,7 +27,6 @@
 #include <linux/acpi.h>
 #include <linux/i2c.h>
 
-#include <drm/drm_atomic.h>
 #include <drm/drm_probe_helper.h>
 #include <drm/amdgpu_drm.h>
 #include <drm/drm_edid.h>
@@ -120,27 +119,40 @@ enum dc_edid_status dm_helpers_parse_edid_caps(
 }
 
 static void
-fill_dc_mst_payload_table_from_drm(struct drm_dp_mst_topology_state *mst_state,

		   struct amdgpu_dm_connector *aconnector,


		   struct dc_dp_mst_stream_allocation_table *table)



-{

struct dc_dp_mst_stream_allocation_table new_table = { 0 };
struct dc_dp_mst_stream_allocation *sa;
struct drm_dp_mst_atomic_payload *payload;

/* Fill payload info*/
list_for_each_entry(payload, &mst_state->payloads, next) {
if (payload->delete)


	continue;



sa = &new_table.stream_allocations[new_table.stream_count];


sa->slot_count = payload->time_slots;


sa->vcp_id = payload->vcpi;


new_table.stream_count++;



+fill_dc_mst_payload_table_from_drm(struct amdgpu_dm_connector *aconnector,

		   struct dc_dp_mst_stream_allocation_table *proposed_table)



+{

int i;
struct drm_dp_mst_topology_mgr *mst_mgr =
	&aconnector->mst_port->mst_mgr;



mutex_lock(&mst_mgr->payload_lock);

proposed_table->stream_count = 0;

/* number of active streams */
for (i = 0; i < mst_mgr->max_payloads; i++) {
if (mst_mgr->payloads[i].num_slots == 0)


	break; /* end of vcp_id table */



ASSERT(mst_mgr->payloads[i].payload_state !=


		DP_PAYLOAD_DELETE_LOCAL);



if (mst_mgr->payloads[i].payload_state == DP_PAYLOAD_LOCAL ||


	mst_mgr->payloads[i].payload_state ==


			DP_PAYLOAD_REMOTE) {



	struct dc_dp_mst_stream_allocation *sa =


			&proposed_table->stream_allocations[


				proposed_table->stream_count];



	sa->slot_count = mst_mgr->payloads[i].num_slots;


	sa->vcp_id = mst_mgr->proposed_vcpis[i]->vcpi;


	proposed_table->stream_count++;


}

}


/* Overwrite the old table */
*table = new_table;


mutex_unlock(&mst_mgr->payload_lock);

}
 
 void dm_helpers_dp_update_branch_info(
@@ -158,9 +170,11 @@ bool dm_helpers_dp_mst_write_payload_allocation_table(
   	bool enable)
 {
   struct amdgpu_dm_connector *aconnector;

struct drm_dp_mst_topology_state *mst_state;
struct drm_dp_mst_atomic_payload *payload;


struct dm_connector_state *dm_conn_state;
struct drm_dp_mst_topology_mgr *mst_mgr;
struct drm_dp_mst_port *mst_port;
bool ret;
u8 link_coding_cap = DP_8b_10b_ENCODING;

aconnector = (struct amdgpu_dm_connector *)stream->dm_stream_context;
   /* Accessing the connector state is required for vcpi_slots allocation
@@ -171,21 +185,40 @@ bool dm_helpers_dp_mst_write_payload_allocation_table(
   if (!aconnector || !aconnector->mst_port)
   	return false;

dm_conn_state = to_dm_connector_state(aconnector->base.state);
mst_mgr = &aconnector->mst_port->mst_mgr;


mst_state = to_drm_dp_mst_topology_state(mst_mgr->base.state);



if (!mst_mgr->mst_state)
return false;



mst_port = aconnector->port;


+#if defined(CONFIG_DRM_AMD_DC_DCN)

link_coding_cap = dc_link_dp_mst_decide_link_encoding_format(aconnector->dc_link);

+#endif


if (enable) {

ret = drm_dp_mst_allocate_vcpi(mst_mgr, mst_port,


			       dm_conn_state->pbn,


			       dm_conn_state->vcpi_slots);


if (!ret)


	return false;



} else {
drm_dp_mst_reset_vcpi_slots(mst_mgr, mst_port);


}

/* It's OK for this to fail */

payload = drm_atomic_get_mst_payload_state(mst_state, aconnector->port);
if (enable)
drm_dp_add_payload_part1(mst_mgr, mst_state, payload);


else
drm_dp_remove_payload(mst_mgr, mst_state, payload);




drm_dp_update_payload_part1(mst_mgr, (link_coding_cap == DP_CAP_ANSI_128B132B) ? 0:1);

/* mst_mgr->->payloads are VC payload notify MST branch using DPCD or
    * AUX message. The sequence is slot 1-63 allocated sequence for each
    * stream. AMD ASIC stream slot allocation should follow the same
    * sequence. copy DRM MST allocation to dc */

fill_dc_mst_payload_table_from_drm(mst_state, aconnector, proposed_table);



fill_dc_mst_payload_table_from_drm(aconnector, proposed_table);

return true;
 }
@@ -242,9 +275,8 @@ bool dm_helpers_dp_mst_send_payload_allocation(
   	bool enable)
 {
   struct amdgpu_dm_connector *aconnector;

struct drm_dp_mst_topology_state *mst_state;
struct drm_dp_mst_topology_mgr *mst_mgr;
struct drm_dp_mst_atomic_payload *payload;


struct drm_dp_mst_port *mst_port;
enum mst_progress_status set_flag = MST_ALLOCATE_NEW_PAYLOAD;
enum mst_progress_status clr_flag = MST_CLEAR_ALLOCATED_PAYLOAD;

@@ -253,16 +285,19 @@ bool dm_helpers_dp_mst_send_payload_allocation(
   if (!aconnector || !aconnector->mst_port)
   	return false;

mst_port = aconnector->port;
mst_mgr = &aconnector->mst_port->mst_mgr;


mst_state = to_drm_dp_mst_topology_state(mst_mgr->base.state);


payload = drm_atomic_get_mst_payload_state(mst_state, aconnector->port);


if (!mst_mgr->mst_state)
return false;


if (!enable) {
  set_flag = MST_CLEAR_ALLOCATED_PAYLOAD;
  clr_flag = MST_ALLOCATE_NEW_PAYLOAD;
 }


if (enable && drm_dp_add_payload_part2(mst_mgr, mst_state->base.state, payload)) {


if (drm_dp_update_payload_part2(mst_mgr)) {
amdgpu_dm_set_mst_status(&aconnector->mst_status,
	set_flag, false);
} else {

@@ -272,6 +307,9 @@ bool dm_helpers_dp_mst_send_payload_allocation(
   		clr_flag, false);
   }

if (!enable)
drm_dp_mst_deallocate_vcpi(mst_mgr, mst_port);


return true;

}
 
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
index 1edf7385f8d8..6207026a200f 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
@@ -598,8 +598,15 @@ void amdgpu_dm_initialize_dp_connector(struct amdgpu_display_manager *dm,
 
   dc_link_dp_get_max_link_enc_cap(aconnector->dc_link, &max_link_enc_cap);
   aconnector->mst_mgr.cbs = &dm_mst_cbs;

drm_dp_mst_topology_mgr_init(&aconnector->mst_mgr, adev_to_drm(dm->adev),
		     &aconnector->dm_dp_aux.aux, 16, 4, aconnector->connector_id);




drm_dp_mst_topology_mgr_init(
&aconnector->mst_mgr,


adev_to_drm(dm->adev),


&aconnector->dm_dp_aux.aux,


16,


4,


max_link_enc_cap.lane_count,


drm_dp_bw_code_to_link_rate(max_link_enc_cap.link_rate),


aconnector->connector_id);



drm_connector_attach_dp_subconnector_property(&aconnector->base);
 }
@@ -710,13 +717,12 @@ static int bpp_x16_from_pbn(struct dsc_mst_fairness_params param, int pbn)
   return dsc_config.bits_per_pixel;
 }
 
-static int increase_dsc_bpp(struct drm_atomic_state *state,

	    struct drm_dp_mst_topology_state *mst_state,


	    struct dc_link *dc_link,


	    struct dsc_mst_fairness_params *params,


	    struct dsc_mst_fairness_vars *vars,


	    int count,


	    int k)



+static bool increase_dsc_bpp(struct drm_atomic_state *state,

	     struct dc_link *dc_link,


	     struct dsc_mst_fairness_params *params,


	     struct dsc_mst_fairness_vars *vars,


	     int count,


	     int k)



{
   int i;
   bool bpp_increased[MAX_PIPES];
@@ -724,10 +730,13 @@ static int increase_dsc_bpp(struct drm_atomic_state *state,
   int min_initial_slack;
   int next_index;
   int remaining_to_increase = 0;

int pbn_per_timeslot;
int link_timeslots_used;
int fair_pbn_alloc;
int ret = 0;


pbn_per_timeslot = dm_mst_get_pbn_divider(dc_link);
for (i = 0; i < count; i++) {
  if (vars[i + k].dsc_enabled) {
  	initial_slack[i] =

@@ -758,17 +767,18 @@ static int increase_dsc_bpp(struct drm_atomic_state *state,
   	link_timeslots_used = 0;
 
   	for (i = 0; i < count; i++)

	link_timeslots_used += DIV_ROUND_UP(vars[i + k].pbn, mst_state->pbn_div);




	link_timeslots_used += DIV_ROUND_UP(vars[i + k].pbn, pbn_per_timeslot);




fair_pbn_alloc =


	(63 - link_timeslots_used) / remaining_to_increase * mst_state->pbn_div;




fair_pbn_alloc = (63 - link_timeslots_used) / remaining_to_increase * pbn_per_timeslot;



if (initial_slack[next_index] > fair_pbn_alloc) {
   		vars[next_index].pbn += fair_pbn_alloc;

ret = drm_dp_atomic_find_time_slots(state,
				    params[next_index].port->mgr,
				    params[next_index].port,




					    vars[next_index].pbn);




					    vars[next_index].pbn,


					    pbn_per_timeslot);
if (ret < 0)
	return ret;



@@ -780,7 +790,8 @@ static int increase_dsc_bpp(struct drm_atomic_state *state,
   			ret = drm_dp_atomic_find_time_slots(state,
   							    params[next_index].port->mgr,
   							    params[next_index].port,

						    vars[next_index].pbn);




						    vars[next_index].pbn,


						    pbn_per_timeslot);
	if (ret < 0)
		return ret;
}



@@ -789,7 +800,8 @@ static int increase_dsc_bpp(struct drm_atomic_state *state,
   		ret = drm_dp_atomic_find_time_slots(state,
   						    params[next_index].port->mgr,
   						    params[next_index].port,

					    vars[next_index].pbn);




					    vars[next_index].pbn,


					    pbn_per_timeslot);
if (ret < 0)
	return ret;



@@ -801,7 +813,8 @@ static int increase_dsc_bpp(struct drm_atomic_state *state,
   			ret = drm_dp_atomic_find_time_slots(state,
   							    params[next_index].port->mgr,
   							    params[next_index].port,

						    vars[next_index].pbn);




						    vars[next_index].pbn,


						    pbn_per_timeslot);
	if (ret < 0)
		return ret;
}



@@ -857,10 +870,12 @@ static int try_disable_dsc(struct drm_atomic_state *state,
   		break;
 
   	vars[next_index].pbn = kbps_to_peak_pbn(params[next_index].bw_range.stream_kbps);

ret = drm_dp_atomic_find_time_slots(state,
  				    params[next_index].port->mgr,
  				    params[next_index].port,


				    vars[next_index].pbn);




				    vars[next_index].pbn,


				    dm_mst_get_pbn_divider(dc_link));

if (ret < 0)
	return ret;

@@ -870,10 +885,12 @@ static int try_disable_dsc(struct drm_atomic_state *state,
   		vars[next_index].bpp_x16 = 0;
   	} else {
   		vars[next_index].pbn = kbps_to_peak_pbn(params[next_index].bw_range.max_kbps);

ret = drm_dp_atomic_find_time_slots(state,
				    params[next_index].port->mgr,
				    params[next_index].port,




					    vars[next_index].pbn);




					    vars[next_index].pbn,


					    dm_mst_get_pbn_divider(dc_link));
if (ret < 0)
	return ret;

}

@@ -884,31 +901,21 @@ static int try_disable_dsc(struct drm_atomic_state *state,
   return 0;
 }
 
-static int compute_mst_dsc_configs_for_link(struct drm_atomic_state *state,

			    struct dc_state *dc_state,


			    struct dc_link *dc_link,


			    struct dsc_mst_fairness_vars *vars,


			    struct drm_dp_mst_topology_mgr *mgr,


			    int *link_vars_start_index)



+static bool compute_mst_dsc_configs_for_link(struct drm_atomic_state *state,

			     struct dc_state *dc_state,


			     struct dc_link *dc_link,


			     struct dsc_mst_fairness_vars *vars,


			     int *link_vars_start_index)



{

int i, k, ret;
struct dc_stream_state *stream;
struct dsc_mst_fairness_params params[MAX_PIPES];
struct amdgpu_dm_connector *aconnector;


struct drm_dp_mst_topology_state *mst_state = drm_atomic_get_mst_topology_state(state, mgr);
int count = 0;
int i, k, ret;
bool debugfs_overwrite = false;

memset(params, 0, sizeof(params));

if (IS_ERR(mst_state))
return PTR_ERR(mst_state);



mst_state->pbn_div = dm_mst_get_pbn_divider(dc_link);

-#if defined(CONFIG_DRM_AMD_DC_DCN)

drm_dp_mst_update_slots(mst_state, dc_link_dp_mst_decide_link_encoding_format(dc_link));

-#endif

/* Set up params */
 for (i = 0; i < dc_state->stream_count; i++) {
  struct dc_dsc_policy dsc_policy = {0};

@@ -968,7 +975,7 @@ static int compute_mst_dsc_configs_for_link(struct drm_atomic_state *state,
   	vars[i + k].dsc_enabled = false;
   	vars[i + k].bpp_x16 = 0;
   	ret = drm_dp_atomic_find_time_slots(state, params[i].port->mgr, params[i].port,

				    vars[i + k].pbn);




				    vars[i + k].pbn, dm_mst_get_pbn_divider(dc_link));

if (ret < 0)
	return ret;
}

@@ -987,7 +994,7 @@ static int compute_mst_dsc_configs_for_link(struct drm_atomic_state *state,
   		vars[i + k].dsc_enabled = true;
   		vars[i + k].bpp_x16 = params[i].bw_range.min_target_bpp_x16;
   		ret = drm_dp_atomic_find_time_slots(state, params[i].port->mgr,

					    params[i].port, vars[i + k].pbn);




					    params[i].port, vars[i + k].pbn, dm_mst_get_pbn_divider(dc_link));
if (ret < 0)
	return ret;

} else {

@@ -995,7 +1002,7 @@ static int compute_mst_dsc_configs_for_link(struct drm_atomic_state *state,
   		vars[i + k].dsc_enabled = false;
   		vars[i + k].bpp_x16 = 0;
   		ret = drm_dp_atomic_find_time_slots(state, params[i].port->mgr,

					    params[i].port, vars[i + k].pbn);




					    params[i].port, vars[i + k].pbn, dm_mst_get_pbn_divider(dc_link));
if (ret < 0)
	return ret;

}

@@ -1005,7 +1012,7 @@ static int compute_mst_dsc_configs_for_link(struct drm_atomic_state *state,
   	return ret;
 
   /* Optimize degree of compression */

ret = increase_dsc_bpp(state, mst_state, dc_link, params, vars, count, k);


ret = increase_dsc_bpp(state, dc_link, params, vars, count, k);
if (ret < 0)
return ret;

@@ -1155,7 +1162,7 @@ int compute_mst_dsc_configs_for_state(struct drm_atomic_state *state,
   		continue;
 
   	mst_mgr = aconnector->port->mgr;

ret = compute_mst_dsc_configs_for_link(state, dc_state, stream->link, vars, mst_mgr,




ret = compute_mst_dsc_configs_for_link(state, dc_state, stream->link, vars,
			       &link_vars_start_index);

if (ret != 0)
	return ret;

@@ -1213,7 +1220,7 @@ static int pre_compute_mst_dsc_configs_for_state(struct drm_atomic_state *state,
   		continue;
 
   	mst_mgr = aconnector->port->mgr;

ret = compute_mst_dsc_configs_for_link(state, dc_state, stream->link, vars, mst_mgr,




ret = compute_mst_dsc_configs_for_link(state, dc_state, stream->link, vars,
			       &link_vars_start_index);

if (ret != 0)
	return ret;

diff --git a/drivers/gpu/drm/amd/display/include/link_service_types.h b/drivers/gpu/drm/amd/display/include/link_service_types.h
index d1e91d31d151..0889c2a86733 100644
--- a/drivers/gpu/drm/amd/display/include/link_service_types.h
+++ b/drivers/gpu/drm/amd/display/include/link_service_types.h
@@ -252,9 +252,6 @@ union dpcd_training_lane_set {

_ONLY_ be filled out from DM and then passed to DC, do NOT use these for _any_ kind of atomic
state calculations in DM, or you will break something.

*/



-struct drm_dp_mst_port;



/* DP MST stream allocation (payload bandwidth number) */
 struct dc_dp_mst_stream_allocation {
   uint8_t vcp_id;
diff --git a/drivers/gpu/drm/display/drm_dp_mst_topology.c b/drivers/gpu/drm/display/drm_dp_mst_topology.c
index 51a46689cda7..95ff57d20216 100644
--- a/drivers/gpu/drm/display/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/display/drm_dp_mst_topology.c
@@ -68,7 +68,8 @@ static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr,
 static void drm_dp_mst_topology_put_port(struct drm_dp_mst_port *port);
 
 static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr,

		     int id, u8 start_slot, u8 num_slots);




		     int id,


		     struct drm_dp_payload *payload);



static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr,
   			 struct drm_dp_mst_port *port,
@@ -1234,6 +1235,57 @@ build_query_stream_enc_status(struct drm_dp_sideband_msg_tx *msg, u8 stream_id,
   return 0;
 }
 
+static int drm_dp_mst_assign_payload_id(struct drm_dp_mst_topology_mgr *mgr,

			struct drm_dp_vcpi *vcpi)



+{

int ret, vcpi_ret;

mutex_lock(&mgr->payload_lock);
ret = find_first_zero_bit(&mgr->payload_mask, mgr->max_payloads + 1);
if (ret > mgr->max_payloads) {
ret = -EINVAL;


drm_dbg_kms(mgr->dev, "out of payload ids %d\n", ret);


goto out_unlock;


}

vcpi_ret = find_first_zero_bit(&mgr->vcpi_mask, mgr->max_payloads + 1);
if (vcpi_ret > mgr->max_payloads) {
ret = -EINVAL;


drm_dbg_kms(mgr->dev, "out of vcpi ids %d\n", ret);


goto out_unlock;


}

set_bit(ret, &mgr->payload_mask);
set_bit(vcpi_ret, &mgr->vcpi_mask);
vcpi->vcpi = vcpi_ret + 1;
mgr->proposed_vcpis[ret - 1] = vcpi;

+out_unlock:

mutex_unlock(&mgr->payload_lock);
return ret;

+}



+static void drm_dp_mst_put_payload_id(struct drm_dp_mst_topology_mgr *mgr,

		      int vcpi)



+{

int i;

if (vcpi == 0)
return;



mutex_lock(&mgr->payload_lock);
drm_dbg_kms(mgr->dev, "putting payload %d\n", vcpi);
clear_bit(vcpi - 1, &mgr->vcpi_mask);

for (i = 0; i < mgr->max_payloads; i++) {
if (mgr->proposed_vcpis[i] &&


    mgr->proposed_vcpis[i]->vcpi == vcpi) {


	mgr->proposed_vcpis[i] = NULL;


	clear_bit(i + 1, &mgr->payload_mask);


}


}
mutex_unlock(&mgr->payload_lock);

+}



static bool check_txmsg_state(struct drm_dp_mst_topology_mgr *mgr,
   		      struct drm_dp_sideband_msg_tx *txmsg)
 {
@@ -1686,7 +1738,7 @@ drm_dp_mst_dump_port_topology_history(struct drm_dp_mst_port *port) {}
 #define save_port_topology_ref(port, type)
 #endif
 
-struct drm_dp_mst_atomic_payload *
+static struct drm_dp_mst_atomic_payload *
 drm_atomic_get_mst_payload_state(struct drm_dp_mst_topology_state *state,
   			 struct drm_dp_mst_port *port)
 {
@@ -1698,7 +1750,6 @@ drm_atomic_get_mst_payload_state(struct drm_dp_mst_topology_state *state,
 
   return NULL;
 }
-EXPORT_SYMBOL(drm_atomic_get_mst_payload_state);
 
 static void drm_dp_destroy_mst_branch_device(struct kref *kref)
 {
@@ -3201,8 +3252,6 @@ int drm_dp_send_query_stream_enc_status(struct drm_dp_mst_topology_mgr *mgr,
   	struct drm_dp_mst_port *port,
   	struct drm_dp_query_stream_enc_status_ack_reply *status)
 {

struct drm_dp_mst_topology_state *state;
struct drm_dp_mst_atomic_payload *payload;
struct drm_dp_sideband_msg_tx *txmsg;
u8 nonce[7];
int ret;

@@ -3219,10 +3268,6 @@ int drm_dp_send_query_stream_enc_status(struct drm_dp_mst_topology_mgr *mgr,
 
   get_random_bytes(nonce, sizeof(nonce));

drm_modeset_lock(&mgr->base.lock, NULL);
state = to_drm_dp_mst_topology_state(mgr->base.state);
payload = drm_atomic_get_mst_payload_state(state, port);
/*
"Source device targets the QUERY_STREAM_ENCRYPTION_STATUS message
transaction at the MST Branch device directly connected to the



@@ -3230,7 +3275,7 @@ int drm_dp_send_query_stream_enc_status(struct drm_dp_mst_topology_mgr *mgr,
    */
   txmsg->dst = mgr->mst_primary;

build_query_stream_enc_status(txmsg, payload->vcpi, nonce);


build_query_stream_enc_status(txmsg, port->vcpi.vcpi, nonce);

drm_dp_queue_down_tx(mgr, txmsg);
 
@@ -3247,7 +3292,6 @@ int drm_dp_send_query_stream_enc_status(struct drm_dp_mst_topology_mgr *mgr,
   memcpy(status, &txmsg->reply.u.enc_status, sizeof(*status));
 
 out:

drm_modeset_unlock(&mgr->base.lock);
drm_dp_mst_topology_put_port(port);

out_get_port:
   kfree(txmsg);
@@ -3256,162 +3300,238 @@ int drm_dp_send_query_stream_enc_status(struct drm_dp_mst_topology_mgr *mgr,
 EXPORT_SYMBOL(drm_dp_send_query_stream_enc_status);
 
 static int drm_dp_create_payload_step1(struct drm_dp_mst_topology_mgr *mgr,

		       struct drm_dp_mst_atomic_payload *payload)




		       int id,


		       struct drm_dp_payload *payload)



{

return drm_dp_dpcd_write_payload(mgr, payload->vcpi, payload->vc_start_slot,
			 payload->time_slots);




int ret;

ret = drm_dp_dpcd_write_payload(mgr, id, payload);
if (ret < 0) {
payload->payload_state = 0;


return ret;


}
payload->payload_state = DP_PAYLOAD_LOCAL;
return 0;

}
 
 static int drm_dp_create_payload_step2(struct drm_dp_mst_topology_mgr *mgr,

		       struct drm_dp_mst_atomic_payload *payload)




		       struct drm_dp_mst_port *port,


		       int id,


		       struct drm_dp_payload *payload)



{
   int ret;

struct drm_dp_mst_port *port = drm_dp_mst_topology_get_port_validated(mgr, payload->port);

if (!port)
return -EIO;




ret = drm_dp_payload_send_msg(mgr, port, payload->vcpi, payload->pbn);
drm_dp_mst_topology_put_port(port);


ret = drm_dp_payload_send_msg(mgr, port, id, port->vcpi.pbn);
if (ret < 0)
return ret;


payload->payload_state = DP_PAYLOAD_REMOTE;
return ret;

}
 
 static int drm_dp_destroy_payload_step1(struct drm_dp_mst_topology_mgr *mgr,

			struct drm_dp_mst_topology_state *mst_state,


			struct drm_dp_mst_atomic_payload *payload)




			struct drm_dp_mst_port *port,


			int id,


			struct drm_dp_payload *payload)



{
   drm_dbg_kms(mgr->dev, "\n");

/* it's okay for these to fail */
drm_dp_payload_send_msg(mgr, payload->port, payload->vcpi, 0);
drm_dp_dpcd_write_payload(mgr, payload->vcpi, payload->vc_start_slot, 0);


if (port) {
drm_dp_payload_send_msg(mgr, port, id, 0);


}


drm_dp_dpcd_write_payload(mgr, id, payload);
payload->payload_state = DP_PAYLOAD_DELETE_LOCAL;
return 0;

+}



+static int drm_dp_destroy_payload_step2(struct drm_dp_mst_topology_mgr *mgr,

			int id,


			struct drm_dp_payload *payload)



+{

payload->payload_state = 0;
return 0;

}
 
 /**


drm_dp_add_payload_part1() - Execute payload update part 1



@mgr: Manager to use.



@mst_state: The MST atomic state



@payload: The payload to write





drm_dp_update_payload_part1() - Execute payload update part 1



@mgr: manager to use.



@start_slot: this is the cur slot







NOTE: start_slot is a temporary workaround for non-atomic drivers,



this will be removed when non-atomic mst helpers are moved out of the helper






Determines the starting time slot for the given payload, and programs the VCPI for this payload



into hardware. After calling this, the driver should generate ACT and payload packets.





This iterates over all proposed virtual channels, and tries to



allocate space in the link for them. For 0->slots transitions,



this step just writes the VCPI to the MST device. For slots->0



transitions, this writes the updated VCPIs and removes the



remote VC payloads.






Returns: 0 on success, error code on failure. In the event that this fails,



@payload.vc_start_slot will also be set to -1.





after calling this the driver should generate ACT and payload



packets.

*/

-int drm_dp_add_payload_part1(struct drm_dp_mst_topology_mgr *mgr,

	     struct drm_dp_mst_topology_state *mst_state,


	     struct drm_dp_mst_atomic_payload *payload)



+int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr, int start_slot)
 {

struct drm_dp_payload req_payload;
struct drm_dp_mst_port *port;


int ret;


int i, j;
int cur_slots = start_slot;
bool skip;


port = drm_dp_mst_topology_get_port_validated(mgr, payload->port);
if (!port)
return 0;




mutex_lock(&mgr->payload_lock);
for (i = 0; i < mgr->max_payloads; i++) {
struct drm_dp_vcpi *vcpi = mgr->proposed_vcpis[i];


struct drm_dp_payload *payload = &mgr->payloads[i];


bool put_port = false;




if (mgr->payload_count == 0)
mgr->next_start_slot = mst_state->start_slot;




/* solve the current payloads - compare to the hw ones


   - update the hw view */


req_payload.start_slot = cur_slots;


if (vcpi) {


	port = container_of(vcpi, struct drm_dp_mst_port,


			    vcpi);




payload->vc_start_slot = mgr->next_start_slot;


	mutex_lock(&mgr->lock);


	skip = !drm_dp_mst_port_downstream_of_branch(port, mgr->mst_primary);


	mutex_unlock(&mgr->lock);




ret = drm_dp_create_payload_step1(mgr, payload);
drm_dp_mst_topology_put_port(port);
if (ret < 0) {
drm_warn(mgr->dev, "Failed to create MST payload for port %p: %d\n",


	 payload->port, ret);


payload->vc_start_slot = -1;


return ret;


}


	if (skip) {


		drm_dbg_kms(mgr->dev,


			    "Virtual channel %d is not in current topology\n",


			    i);


		continue;


	}


	/* Validated ports don't matter if we're releasing


	 * VCPI


	 */


	if (vcpi->num_slots) {


		port = drm_dp_mst_topology_get_port_validated(


		    mgr, port);


		if (!port) {


			if (vcpi->num_slots == payload->num_slots) {


				cur_slots += vcpi->num_slots;


				payload->start_slot = req_payload.start_slot;


				continue;


			} else {


				drm_dbg_kms(mgr->dev,


					    "Fail:set payload to invalid sink");


				mutex_unlock(&mgr->payload_lock);


				return -EINVAL;


			}


		}


		put_port = true;


	}




mgr->payload_count++;
mgr->next_start_slot += payload->time_slots;


	req_payload.num_slots = vcpi->num_slots;


	req_payload.vcpi = vcpi->vcpi;


} else {


	port = NULL;


	req_payload.num_slots = 0;


}




return 0;

-}
-EXPORT_SYMBOL(drm_dp_add_payload_part1);

payload->start_slot = req_payload.start_slot;


/* work out what is required to happen with this payload */


if (payload->num_slots != req_payload.num_slots) {



	/* need to push an update for this payload */


	if (req_payload.num_slots) {


		drm_dp_create_payload_step1(mgr, vcpi->vcpi,


					    &req_payload);


		payload->num_slots = req_payload.num_slots;


		payload->vcpi = req_payload.vcpi;



	} else if (payload->num_slots) {


		payload->num_slots = 0;


		drm_dp_destroy_payload_step1(mgr, port,


					     payload->vcpi,


					     payload);


		req_payload.payload_state =


			payload->payload_state;


		payload->start_slot = 0;


	}


	payload->payload_state = req_payload.payload_state;


}


cur_slots += req_payload.num_slots;



-/**


drm_dp_remove_payload() - Remove an MST payload



@mgr: Manager to use.



@mst_state: The MST atomic state



@payload: The payload to write







Removes a payload from an MST topology if it was successfully assigned a start slot. Also updates



the starting time slots of all other payloads which would have been shifted towards the start of



the VC table as a result. After calling this, the driver should generate ACT and payload packets.


*/

-void drm_dp_remove_payload(struct drm_dp_mst_topology_mgr *mgr,

	   struct drm_dp_mst_topology_state *mst_state,


	   struct drm_dp_mst_atomic_payload *payload)



-{

struct drm_dp_mst_atomic_payload *pos;
bool send_remove = false;


if (put_port)


	drm_dp_mst_topology_put_port(port);


}


/* We failed to make the payload, so nothing to do */
if (payload->vc_start_slot == -1)
return;




for (i = 0; i < mgr->max_payloads; /* do nothing */) {
if (mgr->payloads[i].payload_state != DP_PAYLOAD_DELETE_LOCAL) {


	i++;


	continue;


}




mutex_lock(&mgr->lock);
send_remove = drm_dp_mst_port_downstream_of_branch(payload->port, mgr->mst_primary);
mutex_unlock(&mgr->lock);


drm_dbg_kms(mgr->dev, "removing payload %d\n", i);


for (j = i; j < mgr->max_payloads - 1; j++) {


	mgr->payloads[j] = mgr->payloads[j + 1];


	mgr->proposed_vcpis[j] = mgr->proposed_vcpis[j + 1];




if (send_remove)
drm_dp_destroy_payload_step1(mgr, mst_state, payload);


else
drm_dbg_kms(mgr->dev, "Payload for VCPI %d not in topology, not sending remove\n",


	    payload->vcpi);




	if (mgr->proposed_vcpis[j] &&


	    mgr->proposed_vcpis[j]->num_slots) {


		set_bit(j + 1, &mgr->payload_mask);


	} else {


		clear_bit(j + 1, &mgr->payload_mask);


	}


}




list_for_each_entry(pos, &mst_state->payloads, next) {
if (pos != payload && pos->vc_start_slot > payload->vc_start_slot)


	pos->vc_start_slot -= payload->time_slots;




memset(&mgr->payloads[mgr->max_payloads - 1], 0,


       sizeof(struct drm_dp_payload));


mgr->proposed_vcpis[mgr->max_payloads - 1] = NULL;


clear_bit(mgr->max_payloads, &mgr->payload_mask);

}


payload->vc_start_slot = -1;


mutex_unlock(&mgr->payload_lock);


mgr->payload_count--;
mgr->next_start_slot -= payload->time_slots;


return 0;

}
-EXPORT_SYMBOL(drm_dp_remove_payload);
+EXPORT_SYMBOL(drm_dp_update_payload_part1);
 
 /**


drm_dp_add_payload_part2() - Execute payload update part 2



@mgr: Manager to use.



@state: The global atomic state



@payload: The payload to update







If @payload was successfully assigned a starting time slot by drm_dp_add_payload_part1(), this



function will send the sideband messages to finish allocating this payload.





drm_dp_update_payload_part2() - Execute payload update part 2



@mgr: manager to use.






Returns: 0 on success, negative error code on failure.





This iterates over all proposed virtual channels, and tries to



allocate space in the link for them. For 0->slots transitions,



this step writes the remote VC payload commands. For slots->0



this just resets some internal state.

*/

-int drm_dp_add_payload_part2(struct drm_dp_mst_topology_mgr *mgr,

	     struct drm_atomic_state *state,


	     struct drm_dp_mst_atomic_payload *payload)



+int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr)
 {

struct drm_dp_mst_port *port;
int i;
int ret = 0;
bool skip;


/* Skip failed payloads */
if (payload->vc_start_slot == -1) {
drm_dbg_kms(state->dev, "Part 1 of payload creation for %s failed, skipping part 2\n",


	    payload->port->connector->name);


return -EIO;


}


mutex_lock(&mgr->payload_lock);
for (i = 0; i < mgr->max_payloads; i++) {


ret = drm_dp_create_payload_step2(mgr, payload);
if (ret < 0) {
if (!payload->delete)


	drm_err(mgr->dev, "Step 2 of creating MST payload for %p failed: %d\n",


		payload->port, ret);


else


	drm_dbg_kms(mgr->dev, "Step 2 of removing MST payload for %p failed: %d\n",


		    payload->port, ret);


}


if (!mgr->proposed_vcpis[i])


	continue;




return ret;


port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi);



mutex_lock(&mgr->lock);


skip = !drm_dp_mst_port_downstream_of_branch(port, mgr->mst_primary);


mutex_unlock(&mgr->lock);



if (skip)


	continue;



drm_dbg_kms(mgr->dev, "payload %d %d\n", i, mgr->payloads[i].payload_state);


if (mgr->payloads[i].payload_state == DP_PAYLOAD_LOCAL) {


	ret = drm_dp_create_payload_step2(mgr, port, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]);


} else if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) {


	ret = drm_dp_destroy_payload_step2(mgr, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]);


}


if (ret) {


	mutex_unlock(&mgr->payload_lock);


	return ret;


}


}
mutex_unlock(&mgr->payload_lock);
return 0;

}
-EXPORT_SYMBOL(drm_dp_add_payload_part2);
+EXPORT_SYMBOL(drm_dp_update_payload_part2);
 
 static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr,
   			 struct drm_dp_mst_port *port,
@@ -3591,6 +3711,7 @@ int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool ms
   int ret = 0;
   struct drm_dp_mst_branch *mstb = NULL;

mutex_lock(&mgr->payload_lock);
mutex_lock(&mgr->lock);
if (mst_state == mgr->mst_state)
goto out_unlock;

@@ -3598,6 +3719,10 @@ int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool ms
   mgr->mst_state = mst_state;
   /* set the device into MST mode */
   if (mst_state) {

struct drm_dp_payload reset_pay;


int lane_count;


int link_rate;


WARN_ON(mgr->mst_primary);

/* get dpcd info */
@@ -3608,6 +3733,16 @@ int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool ms
   		goto out_unlock;
   	}

lane_count = min_t(int, mgr->dpcd[2] & DP_MAX_LANE_COUNT_MASK, mgr->max_lane_count);


link_rate = min_t(int, drm_dp_bw_code_to_link_rate(mgr->dpcd[1]), mgr->max_link_rate);


mgr->pbn_div = drm_dp_get_vc_payload_bw(mgr,


					link_rate,


					lane_count);


if (mgr->pbn_div == 0) {


	ret = -EINVAL;


	goto out_unlock;


}


/* add initial branch device at LCT 1 */
  mstb = drm_dp_add_mst_branch_device(1, NULL);
  if (mstb == NULL) {

@@ -3627,8 +3762,9 @@ int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool ms
   	if (ret < 0)
   		goto out_unlock;

/* Write reset payload */


drm_dp_dpcd_write_payload(mgr, 0, 0, 0x3f);




reset_pay.start_slot = 0;


reset_pay.num_slots = 0x3f;


drm_dp_dpcd_write_payload(mgr, 0, &reset_pay);



queue_work(system_long_wq, &mgr->work);
 
@@ -3640,11 +3776,19 @@ int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool ms
   	/* this can fail if the device is gone */
   	drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 0);
   	ret = 0;

memset(mgr->payloads, 0,


       mgr->max_payloads * sizeof(mgr->payloads[0]));


memset(mgr->proposed_vcpis, 0,


       mgr->max_payloads * sizeof(mgr->proposed_vcpis[0]));


mgr->payload_mask = 0;


set_bit(0, &mgr->payload_mask);


mgr->vcpi_mask = 0;

mgr->payload_id_table_cleared = false;
}

out_unlock:
   mutex_unlock(&mgr->lock);

mutex_unlock(&mgr->payload_lock);
if (mstb)
drm_dp_mst_topology_put_mstb(mstb);
return ret;

@@ -4163,18 +4307,62 @@ struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_
 }
 EXPORT_SYMBOL(drm_dp_mst_get_edid);
 
+/**


drm_dp_find_vcpi_slots() - Find time slots for this PBN value



@mgr: manager to use



@pbn: payload bandwidth to convert into slots.







Calculate the number of time slots that will be required for the given PBN



value. This function is deprecated, and should not be used in atomic



drivers.







RETURNS:



The total slots required for this port, or error.


*/

+int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr,

	   int pbn)



+{

int num_slots;

num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div);

/* max. time slots - one slot for MTP header */
if (num_slots > 63)
return -ENOSPC;


return num_slots;

+}
+EXPORT_SYMBOL(drm_dp_find_vcpi_slots);



+static int drm_dp_init_vcpi(struct drm_dp_mst_topology_mgr *mgr,

	    struct drm_dp_vcpi *vcpi, int pbn, int slots)



+{

int ret;

vcpi->pbn = pbn;
vcpi->aligned_pbn = slots * mgr->pbn_div;
vcpi->num_slots = slots;

ret = drm_dp_mst_assign_payload_id(mgr, vcpi);
if (ret < 0)
return ret;


return 0;

+}



/**

drm_dp_atomic_find_time_slots() - Find and add time slots to the state
@state: global atomic state
@mgr: MST topology manager for the port
@port: port to find time slots for
@pbn: bandwidth required for the mode in PBN



@pbn_div: divider for DSC mode that takes FEC into account






Allocates time slots to @port, replacing any previous time slot allocations it may



have had. Any atomic drivers which support MST must call this function in



their &drm_encoder_helper_funcs.atomic_check() callback unconditionally to



change the current time slot allocation for the new state, and ensure the MST



atomic state is added whenever the state of payloads in the topology changes.





Allocates time slots to @port, replacing any previous timeslot allocations it



may have had. Any atomic drivers which support MST must call this function



in their &drm_encoder_helper_funcs.atomic_check() callback to change the



current timeslot allocation for the new state, but only when



&drm_crtc_state.mode_changed or &drm_crtc_state.connectors_changed is set



to ensure compatibility with userspace applications that still use the



legacy modesetting UAPI.

Allocations set by this function are not checked against the bandwidth
restraints of @mgr until the driver calls drm_dp_mst_atomic_check().



@@ -4193,7 +4381,8 @@ EXPORT_SYMBOL(drm_dp_mst_get_edid);
  */
 int drm_dp_atomic_find_time_slots(struct drm_atomic_state *state,
   			  struct drm_dp_mst_topology_mgr *mgr,

		  struct drm_dp_mst_port *port, int pbn)




		  struct drm_dp_mst_port *port, int pbn,


		  int pbn_div)



{
   struct drm_dp_mst_topology_state *topology_state;
   struct drm_dp_mst_atomic_payload *payload = NULL;
@@ -4226,7 +4415,10 @@ int drm_dp_atomic_find_time_slots(struct drm_atomic_state *state,
   	}
   }

req_slots = DIV_ROUND_UP(pbn, topology_state->pbn_div);


if (pbn_div <= 0)
pbn_div = mgr->pbn_div;



req_slots = DIV_ROUND_UP(pbn, pbn_div);

drm_dbg_atomic(mgr->dev, "[CONNECTOR:%d:%s] [MST PORT:%p] TU %d -> %d\n",
   	       port->connector->base.id, port->connector->name,
@@ -4235,7 +4427,7 @@ int drm_dp_atomic_find_time_slots(struct drm_atomic_state *state,
   	       port->connector->base.id, port->connector->name,
   	       port, prev_bw, pbn);

/* Add the new allocation to the state, note the VCPI isn't assigned until the end */


/* Add the new allocation to the state */
if (!payload) {
payload = kzalloc(sizeof(*payload), GFP_KERNEL);
if (!payload)

@@ -4243,7 +4435,6 @@ int drm_dp_atomic_find_time_slots(struct drm_atomic_state *state,
 
   	drm_dp_mst_get_port_malloc(port);
   	payload->port = port;

payload->vc_start_slot = -1;

list_add(&payload->next, &topology_state->payloads);
}
payload->time_slots = req_slots;

@@ -4260,12 +4451,10 @@ EXPORT_SYMBOL(drm_dp_atomic_find_time_slots);

@port: The port to release the time slots from

Releases any time slots that have been allocated to a port in the atomic



state. Any atomic drivers which support MST must call this function



unconditionally in their &drm_connector_helper_funcs.atomic_check() callback.



This helper will check whether time slots would be released by the new state and



respond accordingly, along with ensuring the MST state is always added to the



atomic state whenever a new state would modify the state of payloads on the



topology.





state. Any atomic drivers which support MST must call this function in



their &drm_connector_helper_funcs.atomic_check() callback when the



connector will no longer have VCPI allocated (e.g. because its CRTC was



removed) when it had VCPI allocated in the previous atomic state.

It is OK to call this even if @port has been removed from the system.
Additionally, it is OK to call this function multiple times on the same



@@ -4330,7 +4519,6 @@ int drm_dp_atomic_release_time_slots(struct drm_atomic_state *state,
   	drm_dp_mst_put_port_malloc(port);
   	payload->pbn = 0;
   	payload->delete = true;

topology_state->payload_mask &= ~BIT(payload->vcpi - 1);

}

return 0;
@@ -4381,8 +4569,7 @@ int drm_dp_mst_atomic_setup_commit(struct drm_atomic_state *state)
 EXPORT_SYMBOL(drm_dp_mst_atomic_setup_commit);
 
 /**


drm_dp_mst_atomic_wait_for_dependencies() - Wait for all pending commits on MST topologies,



prepare new MST state for commit





drm_dp_mst_atomic_wait_for_dependencies() - Wait for all pending commits on MST topologies
@state: global atomic state

Goes through any MST topologies in this atomic state, and waits for any pending commits which



@@ -4400,30 +4587,17 @@ EXPORT_SYMBOL(drm_dp_mst_atomic_setup_commit);
  */
 void drm_dp_mst_atomic_wait_for_dependencies(struct drm_atomic_state *state)
 {

struct drm_dp_mst_topology_state *old_mst_state, *new_mst_state;


struct drm_dp_mst_topology_state *old_mst_state;
struct drm_dp_mst_topology_mgr *mgr;


struct drm_dp_mst_atomic_payload *old_payload, *new_payload;
int i, j, ret;


for_each_oldnew_mst_mgr_in_state(state, mgr, old_mst_state, new_mst_state, i) {


for_each_old_mst_mgr_in_state(state, mgr, old_mst_state, i) {
for (j = 0; j < old_mst_state->num_commit_deps; j++) {
	ret = drm_crtc_commit_wait(old_mst_state->commit_deps[j]);
	if (ret < 0)
		drm_err(state->dev, "Failed to wait for %s: %d\n",
			old_mst_state->commit_deps[j]->crtc->name, ret);
}



/* Now that previous state is committed, it's safe to copy over the start slot


 * assignments


 */


list_for_each_entry(old_payload, &old_mst_state->payloads, next) {


	if (old_payload->delete)


		continue;



	new_payload = drm_atomic_get_mst_payload_state(new_mst_state,


						       old_payload->port);


	new_payload->vc_start_slot = old_payload->vc_start_slot;


}

}

}
 EXPORT_SYMBOL(drm_dp_mst_atomic_wait_for_dependencies);
@@ -4508,8 +4682,119 @@ void drm_dp_mst_update_slots(struct drm_dp_mst_topology_state *mst_state, uint8_
 }
 EXPORT_SYMBOL(drm_dp_mst_update_slots);
 
+/**


drm_dp_mst_allocate_vcpi() - Allocate a virtual channel



@mgr: manager for this port



@port: port to allocate a virtual channel for.



@pbn: payload bandwidth number to request



@slots: returned number of slots for this PBN.


*/

+bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr,

	      struct drm_dp_mst_port *port, int pbn, int slots)



+{

int ret;

if (slots < 0)
return false;



port = drm_dp_mst_topology_get_port_validated(mgr, port);
if (!port)
return false;



if (port->vcpi.vcpi > 0) {
drm_dbg_kms(mgr->dev,


	    "payload: vcpi %d already allocated for pbn %d - requested pbn %d\n",


	    port->vcpi.vcpi, port->vcpi.pbn, pbn);


if (pbn == port->vcpi.pbn) {


	drm_dp_mst_topology_put_port(port);


	return true;


}


}

ret = drm_dp_init_vcpi(mgr, &port->vcpi, pbn, slots);
if (ret) {
drm_dbg_kms(mgr->dev, "failed to init time slots=%d ret=%d\n",


	    DIV_ROUND_UP(pbn, mgr->pbn_div), ret);


drm_dp_mst_topology_put_port(port);


goto out;


}
drm_dbg_kms(mgr->dev, "initing vcpi for pbn=%d slots=%d\n", pbn, port->vcpi.num_slots);

/* Keep port allocated until its payload has been removed */
drm_dp_mst_get_port_malloc(port);
drm_dp_mst_topology_put_port(port);
return true;

+out:

return false;

+}
+EXPORT_SYMBOL(drm_dp_mst_allocate_vcpi);



+int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
+{

int slots = 0;

port = drm_dp_mst_topology_get_port_validated(mgr, port);
if (!port)
return slots;



slots = port->vcpi.num_slots;
drm_dp_mst_topology_put_port(port);
return slots;

+}
+EXPORT_SYMBOL(drm_dp_mst_get_vcpi_slots);



+/**


drm_dp_mst_reset_vcpi_slots() - Reset number of slots to 0 for VCPI



@mgr: manager for this port



@port: unverified pointer to a port.







This just resets the number of slots for the ports VCPI for later programming.


*/

+void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
+{

/*
* A port with VCPI will remain allocated until its VCPI is


* released, no verified ref needed


*/



port->vcpi.num_slots = 0;

+}
+EXPORT_SYMBOL(drm_dp_mst_reset_vcpi_slots);



+/**


drm_dp_mst_deallocate_vcpi() - deallocate a VCPI



@mgr: manager for this port



@port: port to deallocate vcpi for







This can be called unconditionally, regardless of whether



drm_dp_mst_allocate_vcpi() succeeded or not.


*/

+void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr,

		struct drm_dp_mst_port *port)



+{

bool skip;

if (!port->vcpi.vcpi)
return;



mutex_lock(&mgr->lock);
skip = !drm_dp_mst_port_downstream_of_branch(port, mgr->mst_primary);
mutex_unlock(&mgr->lock);

if (skip)
return;



drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi);
port->vcpi.num_slots = 0;
port->vcpi.pbn = 0;
port->vcpi.aligned_pbn = 0;
port->vcpi.vcpi = 0;
drm_dp_mst_put_port_malloc(port);

+}
+EXPORT_SYMBOL(drm_dp_mst_deallocate_vcpi);



static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr,

		     int id, u8 start_slot, u8 num_slots)




		     int id, struct drm_dp_payload *payload)



{
   u8 payload_alloc[3], status;
   int ret;
@@ -4519,8 +4804,8 @@ static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr,
   		   DP_PAYLOAD_TABLE_UPDATED);
 
   payload_alloc[0] = id;

payload_alloc[1] = start_slot;
payload_alloc[2] = num_slots;


payload_alloc[1] = payload->start_slot;
payload_alloc[2] = payload->num_slots;

ret = drm_dp_dpcd_write(mgr->aux, DP_PAYLOAD_ALLOCATE_SET, payload_alloc, 3);
   if (ret != 3) {
@@ -4735,9 +5020,8 @@ static void fetch_monitor_name(struct drm_dp_mst_topology_mgr *mgr,
 void drm_dp_mst_dump_topology(struct seq_file *m,
   		      struct drm_dp_mst_topology_mgr *mgr)
 {

struct drm_dp_mst_topology_state *state;
struct drm_dp_mst_atomic_payload *payload;
int i, ret;


int i;
struct drm_dp_mst_port *port;

mutex_lock(&mgr->lock);
   if (mgr->mst_primary)
@@ -4746,35 +5030,36 @@ void drm_dp_mst_dump_topology(struct seq_file *m,
   /* dump VCPIs */
   mutex_unlock(&mgr->lock);

ret = drm_modeset_lock_single_interruptible(&mgr->base.lock);
if (ret < 0)
return;




mutex_lock(&mgr->payload_lock);
seq_printf(m, "\n*** VCPI Info ***\n");
seq_printf(m, "payload_mask: %lx, vcpi_mask: %lx, max_payloads: %d\n", mgr->payload_mask, mgr->vcpi_mask, mgr->max_payloads);


state = to_drm_dp_mst_topology_state(mgr->base.state);
seq_printf(m, "\n*** Atomic state info ***\n");
seq_printf(m, "payload_mask: %x, max_payloads: %d, start_slot: %u, pbn_div: %d\n",
   state->payload_mask, mgr->max_payloads, state->start_slot, state->pbn_div);



seq_printf(m, "\n| idx | port | vcpi | slots | pbn | dsc |     sink name     |\n");


seq_printf(m, "\n|   idx   |  port # |  vcp_id | # slots |     sink name     |\n");
for (i = 0; i < mgr->max_payloads; i++) {


list_for_each_entry(payload, &state->payloads, next) {




if (mgr->proposed_vcpis[i]) {
char name[14];




	if (payload->vcpi != i || payload->delete)


		continue;



	fetch_monitor_name(mgr, payload->port, name, sizeof(name));


	seq_printf(m, " %5d %6d %6d %02d - %02d %5d %5s %19s\n",




	port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi);


	fetch_monitor_name(mgr, port, name, sizeof(name));


	seq_printf(m, "%10d%10d%10d%10d%20s\n",
	   i,




		   payload->port->port_num,


		   payload->vcpi,


		   payload->vc_start_slot,


		   payload->vc_start_slot + payload->time_slots - 1,


		   payload->pbn,


		   payload->dsc_enabled ? "Y" : "N",




		   port->port_num,


		   port->vcpi.vcpi,


		   port->vcpi.num_slots,
	   (*name != 0) ? name : "Unknown");




}




} else


	seq_printf(m, "%6d - Unused\n", i);


}
seq_printf(m, "\n*** Payload Info ***\n");
seq_printf(m, "|   idx   |  state  |  start slot  | # slots |\n");
for (i = 0; i < mgr->max_payloads; i++) {
seq_printf(m, "%10d%10d%15d%10d\n",


	   i,


	   mgr->payloads[i].payload_state,


	   mgr->payloads[i].start_slot,


	   mgr->payloads[i].num_slots);

}
mutex_unlock(&mgr->payload_lock);

seq_printf(m, "\n*** DPCD Info ***\n");
   mutex_lock(&mgr->lock);
@@ -4820,7 +5105,7 @@ void drm_dp_mst_dump_topology(struct seq_file *m,
 
 out:
   mutex_unlock(&mgr->lock);

drm_modeset_unlock(&mgr->base.lock);




}
 EXPORT_SYMBOL(drm_dp_mst_dump_topology);
 
@@ -5141,22 +5426,9 @@ drm_dp_mst_atomic_check_payload_alloc_limits(struct drm_dp_mst_topology_mgr *mgr
   			       mgr, mst_state, mgr->max_payloads);
   		return -EINVAL;
   	}


/* Assign a VCPI */


if (!payload->vcpi) {


	payload->vcpi = ffz(mst_state->payload_mask) + 1;


	drm_dbg_atomic(mgr->dev, "[MST PORT:%p] assigned VCPI #%d\n",


		       payload->port, payload->vcpi);


	mst_state->payload_mask |= BIT(payload->vcpi - 1);


}

}

if (!payload_count)
mst_state->pbn_div = 0;



drm_dbg_atomic(mgr->dev, "[MST MGR:%p] mst state %p TU pbn_div=%d avail=%d used=%d\n",
       mgr, mst_state, mst_state->pbn_div, avail_slots,


       mst_state->total_avail_slots - avail_slots);




drm_dbg_atomic(mgr->dev, "[MST MGR:%p] mst state %p TU avail=%d used=%d\n",
       mgr, mst_state, avail_slots, mst_state->total_avail_slots - avail_slots);



return 0;
 }
@@ -5227,6 +5499,7 @@ EXPORT_SYMBOL(drm_dp_mst_add_affected_dsc_crtcs);

@state: Pointer to the new drm_atomic_state
@port: Pointer to the affected MST Port
@pbn: Newly recalculated bw required for link with DSC enabled



@pbn_div: Divider to calculate correct number of pbn per slot
@enable: Boolean flag to enable or disable DSC on the port

This function enables DSC on the given Port



@@ -5237,7 +5510,8 @@ EXPORT_SYMBOL(drm_dp_mst_add_affected_dsc_crtcs);
  */
 int drm_dp_mst_atomic_enable_dsc(struct drm_atomic_state *state,
   			 struct drm_dp_mst_port *port,

		 int pbn, bool enable)




		 int pbn, int pbn_div,


		 bool enable)



{
   struct drm_dp_mst_topology_state *mst_state;
   struct drm_dp_mst_atomic_payload *payload;
@@ -5263,7 +5537,7 @@ int drm_dp_mst_atomic_enable_dsc(struct drm_atomic_state *state,
   }
 
   if (enable) {

time_slots = drm_dp_atomic_find_time_slots(state, port->mgr, port, pbn);




time_slots = drm_dp_atomic_find_time_slots(state, port->mgr, port, pbn, pbn_div);

drm_dbg_atomic(state->dev,
	       "[MST PORT:%p] Enabling DSC flag, reallocating %d time slots on the port\n",
	       port, time_slots);

@@ -5276,7 +5550,6 @@ int drm_dp_mst_atomic_enable_dsc(struct drm_atomic_state *state,
   return time_slots;
 }
 EXPORT_SYMBOL(drm_dp_mst_atomic_enable_dsc);



/**

drm_dp_mst_atomic_check - Check that the new state of an MST topology in an
atomic update is valid

@@ -5334,6 +5607,7 @@ EXPORT_SYMBOL(drm_dp_mst_topology_state_funcs);
 
 /**

drm_atomic_get_mst_topology_state: get MST topology state




@state: global atomic state
@mgr: MST topology manager, also the private object in this case




@@ -5352,31 +5626,6 @@ struct drm_dp_mst_topology_state *drm_atomic_get_mst_topology_state(struct drm_a
 }
 EXPORT_SYMBOL(drm_atomic_get_mst_topology_state);
 
-/**


drm_atomic_get_new_mst_topology_state: get new MST topology state in atomic state, if any



@state: global atomic state



@mgr: MST topology manager, also the private object in this case







This function wraps drm_atomic_get_priv_obj_state() passing in the MST atomic



state vtable so that the private object state returned is that of a MST



topology object.







Returns:







The MST topology state, or NULL if there's no topology state for this MST mgr



in the global atomic state


*/

-struct drm_dp_mst_topology_state *
-drm_atomic_get_new_mst_topology_state(struct drm_atomic_state *state,

		      struct drm_dp_mst_topology_mgr *mgr)



-{

struct drm_private_state *priv_state =
drm_atomic_get_new_private_obj_state(state, &mgr->base);



return priv_state ? to_dp_mst_topology_state(priv_state) : NULL;

-}
-EXPORT_SYMBOL(drm_atomic_get_new_mst_topology_state);



/**

drm_dp_mst_topology_mgr_init - initialise a topology manager
@mgr: manager struct to initialise

@@ -5384,6 +5633,8 @@ EXPORT_SYMBOL(drm_atomic_get_new_mst_topology_state);

@aux: DP helper aux channel to talk to this device
@max_dpcd_transaction_bytes: hw specific DPCD transaction limit
@max_payloads: maximum number of payloads this GPU can source



@max_lane_count: maximum number of lanes this GPU supports



@max_link_rate: maximum link rate per lane this GPU supports in kHz
@conn_base_id: the connector object ID the MST device is connected to.

Return 0 for success, or negative error code on failure



@@ -5391,12 +5642,14 @@ EXPORT_SYMBOL(drm_atomic_get_new_mst_topology_state);
 int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr,
   			 struct drm_device *dev, struct drm_dp_aux *aux,
   			 int max_dpcd_transaction_bytes, int max_payloads,

		 int max_lane_count, int max_link_rate,
	 int conn_base_id)



{
   struct drm_dp_mst_topology_state *mst_state;
 
   mutex_init(&mgr->lock);
   mutex_init(&mgr->qlock);

mutex_init(&mgr->payload_lock);
mutex_init(&mgr->delayed_destroy_lock);
mutex_init(&mgr->up_req_lock);
mutex_init(&mgr->probe_lock);

@@ -5426,7 +5679,19 @@ int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr,
   mgr->aux = aux;
   mgr->max_dpcd_transaction_bytes = max_dpcd_transaction_bytes;
   mgr->max_payloads = max_payloads;

mgr->max_lane_count = max_lane_count;
mgr->max_link_rate = max_link_rate;
mgr->conn_base_id = conn_base_id;
if (max_payloads + 1 > sizeof(mgr->payload_mask) * 8 ||
   max_payloads + 1 > sizeof(mgr->vcpi_mask) * 8)


return -EINVAL;


mgr->payloads = kcalloc(max_payloads, sizeof(struct drm_dp_payload), GFP_KERNEL);
if (!mgr->payloads)
return -ENOMEM;


mgr->proposed_vcpis = kcalloc(max_payloads, sizeof(struct drm_dp_vcpi *), GFP_KERNEL);
if (!mgr->proposed_vcpis)
return -ENOMEM;


set_bit(0, &mgr->payload_mask);

mst_state = kzalloc(sizeof(*mst_state), GFP_KERNEL);
   if (mst_state == NULL)
@@ -5459,12 +5724,19 @@ void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr)
   	destroy_workqueue(mgr->delayed_destroy_wq);
   	mgr->delayed_destroy_wq = NULL;
   }

mutex_lock(&mgr->payload_lock);
kfree(mgr->payloads);
mgr->payloads = NULL;
kfree(mgr->proposed_vcpis);
mgr->proposed_vcpis = NULL;
mutex_unlock(&mgr->payload_lock);
mgr->dev = NULL;
mgr->aux = NULL;
drm_atomic_private_obj_fini(&mgr->base);
mgr->funcs = NULL;

mutex_destroy(&mgr->delayed_destroy_lock);

mutex_destroy(&mgr->payload_lock);
mutex_destroy(&mgr->qlock);
mutex_destroy(&mgr->lock);
mutex_destroy(&mgr->up_req_lock);

diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index 8b0e4defa3f1..4428eabc6ff7 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -57,7 +57,6 @@ static int intel_dp_mst_find_vcpi_slots_for_bpp(struct intel_encoder *encoder,
   struct drm_atomic_state *state = crtc_state->uapi.state;
   struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
   struct intel_dp *intel_dp = &intel_mst->primary->dp;

struct drm_dp_mst_topology_state *mst_state;
struct intel_connector *connector =
to_intel_connector(conn_state->connector);
struct drm_i915_private *i915 = to_i915(connector->base.dev);

@@ -66,30 +65,23 @@ static int intel_dp_mst_find_vcpi_slots_for_bpp(struct intel_encoder *encoder,
   int bpp, slots = -EINVAL;
   int ret = 0;

mst_state = drm_atomic_get_mst_topology_state(state, &intel_dp->mst_mgr);
if (IS_ERR(mst_state))
return PTR_ERR(mst_state);


crtc_state->lane_count = limits->max_lane_count;
 crtc_state->port_clock = limits->max_rate;


// TODO: Handle pbn_div changes by adding a new MST helper
if (!mst_state->pbn_div) {
mst_state->pbn_div = drm_dp_get_vc_payload_bw(&intel_dp->mst_mgr,


					      crtc_state->port_clock,


					      crtc_state->lane_count);


}


for (bpp = limits->max_bpp; bpp >= limits->min_bpp; bpp -= 2 * 3) {
crtc_state->pipe_bpp = bpp;




for (bpp = max_bpp; bpp >= min_bpp; bpp -= step) {
crtc_state->pbn = drm_dp_calc_pbn_mode(adjusted_mode->crtc_clock,
				       dsc ? bpp << 4 : bpp,
				       dsc);


drm_dbg_kms(&i915->drm, "Trying bpp %d\n", bpp);


slots = drm_dp_atomic_find_time_slots(state, &intel_dp->mst_mgr,
  				      connector->port,
				      crtc_state->pbn);




				      crtc_state->pbn,


				      drm_dp_get_vc_payload_bw(&intel_dp->mst_mgr,


							       crtc_state->port_clock,


							       crtc_state->lane_count));


if (slots == -EDEADLK)
  	return slots;

@@ -524,17 +516,21 @@ static void intel_mst_disable_dp(struct intel_atomic_state *state,
   struct intel_dp *intel_dp = &dig_port->dp;
   struct intel_connector *connector =
   	to_intel_connector(old_conn_state->connector);

struct drm_dp_mst_topology_state *mst_state =
drm_atomic_get_mst_topology_state(&state->base, &intel_dp->mst_mgr);

struct drm_i915_private *i915 = to_i915(connector->base.dev);


int start_slot = intel_dp_is_uhbr(old_crtc_state) ? 0 : 1;
int ret;

drm_dbg_kms(&i915->drm, "active links %d\n",
   	    intel_dp->active_mst_links);
 
   intel_hdcp_disable(intel_mst->connector);

drm_dp_remove_payload(&intel_dp->mst_mgr, mst_state,
	      drm_atomic_get_mst_payload_state(mst_state, connector->port));




drm_dp_mst_reset_vcpi_slots(&intel_dp->mst_mgr, connector->port);

ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr, start_slot);
if (ret) {
drm_dbg_kms(&i915->drm, "failed to update payload %d\n", ret);


}

intel_audio_codec_disable(encoder, old_crtc_state, old_conn_state);
 }
@@ -562,6 +558,8 @@ static void intel_mst_post_disable_dp(struct intel_atomic_state *state,
 
   intel_disable_transcoder(old_crtc_state);

drm_dp_update_payload_part2(&intel_dp->mst_mgr);
clear_act_sent(encoder, old_crtc_state);

intel_de_rmw(dev_priv, TRANS_DDI_FUNC_CTL(old_crtc_state->cpu_transcoder),
@@ -569,6 +567,8 @@ static void intel_mst_post_disable_dp(struct intel_atomic_state *state,
 
   wait_for_act_sent(encoder, old_crtc_state);

drm_dp_mst_deallocate_vcpi(&intel_dp->mst_mgr, connector->port);
intel_ddi_disable_transcoder_func(old_crtc_state);

if (DISPLAY_VER(dev_priv) >= 9)
@@ -635,8 +635,7 @@ static void intel_mst_pre_enable_dp(struct intel_atomic_state *state,
   struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
   struct intel_connector *connector =
   	to_intel_connector(conn_state->connector);

struct drm_dp_mst_topology_state *mst_state =
drm_atomic_get_new_mst_topology_state(&state->base, &intel_dp->mst_mgr);




int start_slot = intel_dp_is_uhbr(pipe_config) ? 0 : 1;
int ret;
bool first_mst_stream;

@@ -662,13 +661,16 @@ static void intel_mst_pre_enable_dp(struct intel_atomic_state *state,
   	dig_port->base.pre_enable(state, &dig_port->base,
   					pipe_config, NULL);

ret = drm_dp_mst_allocate_vcpi(&intel_dp->mst_mgr,
		       connector->port,


		       pipe_config->pbn,


		       pipe_config->dp_m_n.tu);


if (!ret)
drm_err(&dev_priv->drm, "failed to allocate vcpi\n");


intel_dp->active_mst_links++;


ret = drm_dp_add_payload_part1(&intel_dp->mst_mgr, mst_state,
		       drm_atomic_get_mst_payload_state(mst_state, connector->port));


if (ret < 0)
drm_err(&dev_priv->drm, "Failed to create MST payload for %s: %d\n",


	connector->base.name, ret);




ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr, start_slot);

/*
    * Before Gen 12 this is not done as part of
@@ -691,10 +693,7 @@ static void intel_mst_enable_dp(struct intel_atomic_state *state,
   struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
   struct intel_digital_port *dig_port = intel_mst->primary;
   struct intel_dp *intel_dp = &dig_port->dp;

struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
struct drm_dp_mst_topology_state *mst_state =
drm_atomic_get_new_mst_topology_state(&state->base, &intel_dp->mst_mgr);

enum transcoder trans = pipe_config->cpu_transcoder;

drm_WARN_ON(&dev_priv->drm, pipe_config->has_pch_encoder);
@@ -722,8 +721,7 @@ static void intel_mst_enable_dp(struct intel_atomic_state *state,
 
   wait_for_act_sent(encoder, pipe_config);

drm_dp_add_payload_part2(&intel_dp->mst_mgr, &state->base,
		 drm_atomic_get_mst_payload_state(mst_state, connector->port));




drm_dp_update_payload_part2(&intel_dp->mst_mgr);

if (DISPLAY_VER(dev_priv) >= 14 && pipe_config->fec_enable)
   	intel_de_rmw(dev_priv, MTL_CHICKEN_TRANS(trans), 0,
@@ -1170,6 +1168,8 @@ intel_dp_mst_encoder_init(struct intel_digital_port *dig_port, int conn_base_id)
   struct intel_dp *intel_dp = &dig_port->dp;
   enum port port = dig_port->base.port;
   int ret;

int max_source_rate =
intel_dp->source_rates[intel_dp->num_source_rates - 1];



if (!HAS_DP_MST(i915) || intel_dp_is_edp(intel_dp))
   	return 0;
@@ -1185,7 +1185,10 @@ intel_dp_mst_encoder_init(struct intel_digital_port *dig_port, int conn_base_id)
   /* create encoders */
   intel_dp_create_fake_mst_encoders(dig_port);
   ret = drm_dp_mst_topology_mgr_init(&intel_dp->mst_mgr, &i915->drm,

			   &intel_dp->aux, 16, 3, conn_base_id);




			   &intel_dp->aux, 16, 3,


			   dig_port->max_lanes,


			   max_source_rate,


			   conn_base_id);

if (ret) {
intel_dp->mst_mgr.cbs = NULL;
return ret;

diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c b/drivers/gpu/drm/i915/display/intel_hdcp.c
index 6406fd487ee5..987e02eea66a 100644
--- a/drivers/gpu/drm/i915/display/intel_hdcp.c
+++ b/drivers/gpu/drm/i915/display/intel_hdcp.c
@@ -31,30 +31,8 @@
 
 static int intel_conn_to_vcpi(struct intel_connector *connector)
 {

struct drm_dp_mst_topology_mgr *mgr;
struct drm_dp_mst_atomic_payload *payload;
struct drm_dp_mst_topology_state *mst_state;
int vcpi = 0;
/* For HDMI this is forced to be 0x0. For DP SST also this is 0x0. */
if (!connector->port)
return 0;


mgr = connector->port->mgr;

drm_modeset_lock(&mgr->base.lock, NULL);
mst_state = to_drm_dp_mst_topology_state(mgr->base.state);
payload = drm_atomic_get_mst_payload_state(mst_state, connector->port);
if (drm_WARN_ON(mgr->dev, !payload))
goto out;



vcpi = payload->vcpi;
if (drm_WARN_ON(mgr->dev, vcpi < 0)) {
vcpi = 0;


goto out;


}

-out:

drm_modeset_unlock(&mgr->base.lock);
return vcpi;


return connector->port	? connector->port->vcpi.vcpi : 0;

}
 
 /*
diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c b/drivers/gpu/drm/nouveau/dispnv50/disp.c
index edcb2529b402..9bebe2a5e284 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/disp.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c
@@ -831,7 +831,6 @@ struct nv50_msto {
   struct nv50_head *head;
   struct nv50_mstc *mstc;
   bool disabled;

bool enabled;

};
 
 struct nouveau_encoder *nv50_real_outp(struct drm_encoder *encoder)
@@ -847,55 +846,82 @@ struct nouveau_encoder *nv50_real_outp(struct drm_encoder *encoder)
   return msto->mstc->mstm->outp;
 }
 
+static struct drm_dp_payload *
+nv50_msto_payload(struct nv50_msto *msto)
+{

struct nouveau_drm *drm = nouveau_drm(msto->encoder.dev);
struct nv50_mstc *mstc = msto->mstc;
struct nv50_mstm *mstm = mstc->mstm;
int vcpi = mstc->port->vcpi.vcpi, i;

WARN_ON(!mutex_is_locked(&mstm->mgr.payload_lock));

NV_ATOMIC(drm, "%s: vcpi %d\n", msto->encoder.name, vcpi);
for (i = 0; i < mstm->mgr.max_payloads; i++) {
struct drm_dp_payload *payload = &mstm->mgr.payloads[i];


NV_ATOMIC(drm, "%s: %d: vcpi %d start 0x%02x slots 0x%02x\n",


	  mstm->outp->base.base.name, i, payload->vcpi,


	  payload->start_slot, payload->num_slots);


}

for (i = 0; i < mstm->mgr.max_payloads; i++) {
struct drm_dp_payload *payload = &mstm->mgr.payloads[i];


if (payload->vcpi == vcpi)


	return payload;


}

return NULL;

+}



static void
-nv50_msto_cleanup(struct drm_atomic_state *state,

  struct drm_dp_mst_topology_state *mst_state,


  struct drm_dp_mst_topology_mgr *mgr,


  struct nv50_msto *msto)



+nv50_msto_cleanup(struct nv50_msto *msto)
 {
   struct nouveau_drm *drm = nouveau_drm(msto->encoder.dev);

struct drm_dp_mst_atomic_payload *payload =
drm_atomic_get_mst_payload_state(mst_state, msto->mstc->port);




struct nv50_mstc *mstc = msto->mstc;
struct nv50_mstm *mstm = mstc->mstm;

if (!msto->disabled)
return;



NV_ATOMIC(drm, "%s: msto cleanup\n", msto->encoder.name);

if (msto->disabled) {
msto->mstc = NULL;


msto->disabled = false;


} else if (msto->enabled) {
drm_dp_add_payload_part2(mgr, state, payload);


msto->enabled = false;


}


drm_dp_mst_deallocate_vcpi(&mstm->mgr, mstc->port);

msto->mstc = NULL;
msto->disabled = false;

}
 
 static void
-nv50_msto_prepare(struct drm_atomic_state *state,

  struct drm_dp_mst_topology_state *mst_state,


  struct drm_dp_mst_topology_mgr *mgr,


  struct nv50_msto *msto)



+nv50_msto_prepare(struct nv50_msto *msto)
 {
   struct nouveau_drm *drm = nouveau_drm(msto->encoder.dev);
   struct nv50_mstc *mstc = msto->mstc;
   struct nv50_mstm *mstm = mstc->mstm;

struct drm_dp_mst_atomic_payload *payload;


struct drm_dp_payload *payload = NULL;


NV_ATOMIC(drm, "%s: msto prepare\n", msto->encoder.name);


mutex_lock(&mstm->mgr.payload_lock);


payload = drm_atomic_get_mst_payload_state(mst_state, mstc->port);


NV_ATOMIC(drm, "%s: msto prepare\n", msto->encoder.name);


// TODO: Figure out if we want to do a better job of handling VCPI allocation failures here?
if (msto->disabled) {
drm_dp_remove_payload(mgr, mst_state, payload);




if (mstc->port->vcpi.vcpi > 0)
payload = nv50_msto_payload(msto);




nvif_outp_dp_mst_vcpi(&mstm->outp->outp, msto->head->base.index, 0, 0, 0, 0);


} else {
if (msto->enabled)


	drm_dp_add_payload_part1(mgr, mst_state, payload);




if (payload) {
NV_ATOMIC(drm, "%s: %s: %02x %02x %04x %04x\n",


	  msto->encoder.name, msto->head->base.base.name,


	  payload->start_slot, payload->num_slots,


	  mstc->port->vcpi.pbn, mstc->port->vcpi.aligned_pbn);



nvif_outp_dp_mst_vcpi(&mstm->outp->outp, msto->head->base.index,

		      payload->vc_start_slot, payload->time_slots,


		      payload->pbn, payload->time_slots * mst_state->pbn_div);




		      payload->start_slot, payload->num_slots,


		      mstc->port->vcpi.pbn, mstc->port->vcpi.aligned_pbn);


} else {
NV_ATOMIC(drm, "%s: %s: %02x %02x %04x %04x\n",


	  msto->encoder.name, msto->head->base.base.name, 0, 0, 0, 0);


nvif_outp_dp_mst_vcpi(&mstm->outp->outp, msto->head->base.index, 0, 0, 0, 0);

}

mutex_unlock(&mstm->mgr.payload_lock);

}
 
 static int
@@ -905,7 +931,6 @@ nv50_msto_atomic_check(struct drm_encoder *encoder,
 {
   struct drm_atomic_state *state = crtc_state->state;
   struct drm_connector *connector = conn_state->connector;

struct drm_dp_mst_topology_state *mst_state;
struct nv50_mstc *mstc = nv50_mstc(connector);
struct nv50_mstm *mstm = mstc->mstm;
struct nv50_head_atom *asyh = nv50_head_atom(crtc_state);

@@ -933,18 +958,8 @@ nv50_msto_atomic_check(struct drm_encoder *encoder,
   					    false);
   }

mst_state = drm_atomic_get_mst_topology_state(state, &mstm->mgr);
if (IS_ERR(mst_state))
return PTR_ERR(mst_state);



if (!mst_state->pbn_div) {
struct nouveau_encoder *outp = mstc->mstm->outp;



mst_state->pbn_div = drm_dp_get_vc_payload_bw(&mstm->mgr,


					      outp->dp.link_bw, outp->dp.link_nr);


}

slots = drm_dp_atomic_find_time_slots(state, &mstm->mgr, mstc->port, asyh->dp.pbn);


slots = drm_dp_atomic_find_time_slots(state, &mstm->mgr, mstc->port,
			      asyh->dp.pbn, 0);

if (slots < 0)
return slots;

@@ -976,6 +991,7 @@ nv50_msto_atomic_enable(struct drm_encoder *encoder, struct drm_atomic_state *st
   struct drm_connector *connector;
   struct drm_connector_list_iter conn_iter;
   u8 proto;

bool r;

drm_connector_list_iter_begin(encoder->dev, &conn_iter);
   drm_for_each_connector_iter(connector, &conn_iter) {
@@ -990,6 +1006,10 @@ nv50_msto_atomic_enable(struct drm_encoder *encoder, struct drm_atomic_state *st
   if (WARN_ON(!mstc))
   	return;

r = drm_dp_mst_allocate_vcpi(&mstm->mgr, mstc->port, asyh->dp.pbn, asyh->dp.tu);
if (!r)
DRM_DEBUG_KMS("Failed to allocate VCPI\n");


if (!mstm->links++) {
  /*XXX: MST audio. */
  nvif_outp_acquire_dp(&mstm->outp->outp, mstm->outp->dp.dpcd, 0, 0, false, true);

@@ -1004,7 +1024,6 @@ nv50_msto_atomic_enable(struct drm_encoder *encoder, struct drm_atomic_state *st
   		   nv50_dp_bpc_to_depth(asyh->or.bpc));
 
   msto->mstc = mstc;

msto->enabled = true;
mstm->modified = true;

}
 
@@ -1015,6 +1034,8 @@ nv50_msto_atomic_disable(struct drm_encoder *encoder, struct drm_atomic_state *s
   struct nv50_mstc *mstc = msto->mstc;
   struct nv50_mstm *mstm = mstc->mstm;

drm_dp_mst_reset_vcpi_slots(&mstm->mgr, mstc->port);
mstm->outp->update(mstm->outp, msto->head->base.index, NULL, 0, 0);
 mstm->modified = true;
 if (!--mstm->links)

@@ -1234,9 +1255,7 @@ nv50_mstc_new(struct nv50_mstm *mstm, struct drm_dp_mst_port *port,
 }
 
 static void
-nv50_mstm_cleanup(struct drm_atomic_state *state,

  struct drm_dp_mst_topology_state *mst_state,


  struct nv50_mstm *mstm)



+nv50_mstm_cleanup(struct nv50_mstm *mstm)
 {
   struct nouveau_drm *drm = nouveau_drm(mstm->outp->base.base.dev);
   struct drm_encoder *encoder;
@@ -1244,12 +1263,14 @@ nv50_mstm_cleanup(struct drm_atomic_state *state,
   NV_ATOMIC(drm, "%s: mstm cleanup\n", mstm->outp->base.base.name);
   drm_dp_check_act_status(&mstm->mgr);

drm_dp_update_payload_part2(&mstm->mgr);
drm_for_each_encoder(encoder, mstm->outp->base.base.dev) {
  if (encoder->encoder_type == DRM_MODE_ENCODER_DPMST) {
  	struct nv50_msto *msto = nv50_msto(encoder);
  	struct nv50_mstc *mstc = msto->mstc;
  	if (mstc && mstc->mstm == mstm)


		nv50_msto_cleanup(state, mst_state, &mstm->mgr, msto);




		nv50_msto_cleanup(msto);

}
}

@@ -1257,34 +1278,20 @@ nv50_mstm_cleanup(struct drm_atomic_state *state,
 }
 
 static void
-nv50_mstm_prepare(struct drm_atomic_state *state,

  struct drm_dp_mst_topology_state *mst_state,


  struct nv50_mstm *mstm)



+nv50_mstm_prepare(struct nv50_mstm *mstm)
 {
   struct nouveau_drm *drm = nouveau_drm(mstm->outp->base.base.dev);
   struct drm_encoder *encoder;
 
   NV_ATOMIC(drm, "%s: mstm prepare\n", mstm->outp->base.base.name);

drm_dp_update_payload_part1(&mstm->mgr, 1);


/* Disable payloads first */
drm_for_each_encoder(encoder, mstm->outp->base.base.dev) {
if (encoder->encoder_type == DRM_MODE_ENCODER_DPMST) {


	struct nv50_msto *msto = nv50_msto(encoder);


	struct nv50_mstc *mstc = msto->mstc;


	if (mstc && mstc->mstm == mstm && msto->disabled)


		nv50_msto_prepare(state, mst_state, &mstm->mgr, msto);


}


}

/* Add payloads for new heads, while also updating the start slots of any unmodified (but
* active) heads that may have had their VC slots shifted left after the previous step


*/

drm_for_each_encoder(encoder, mstm->outp->base.base.dev) {
  if (encoder->encoder_type == DRM_MODE_ENCODER_DPMST) {
  	struct nv50_msto *msto = nv50_msto(encoder);
  	struct nv50_mstc *mstc = msto->mstc;
	if (mstc && mstc->mstm == mstm && !msto->disabled)


		nv50_msto_prepare(state, mst_state, &mstm->mgr, msto);




	if (mstc && mstc->mstm == mstm)


		nv50_msto_prepare(msto);

}
}

@@ -1455,7 +1462,9 @@ nv50_mstm_new(struct nouveau_encoder *outp, struct drm_dp_aux *aux, int aux_max,
   mstm->mgr.cbs = &nv50_mstm;
 
   ret = drm_dp_mst_topology_mgr_init(&mstm->mgr, dev, aux, aux_max,

			   max_payloads, conn_base_id);




			   max_payloads, outp->dcb->dpconf.link_nr,


			   drm_dp_bw_code_to_link_rate(outp->dcb->dpconf.link_bw),


			   conn_base_id);

if (ret)
return ret;

@@ -1902,20 +1911,20 @@ nv50_pior_create(struct drm_connector *connector, struct dcb_output *dcbe)
 static void
 nv50_disp_atomic_commit_core(struct drm_atomic_state *state, u32 *interlock)
 {

struct drm_dp_mst_topology_mgr *mgr;
struct drm_dp_mst_topology_state *mst_state;
struct nouveau_drm *drm = nouveau_drm(state->dev);
struct nv50_disp *disp = nv50_disp(drm->dev);
struct nv50_core *core = disp->core;
struct nv50_mstm *mstm;
int i;


struct drm_encoder *encoder;

NV_ATOMIC(drm, "commit core %08x\n", interlock[NV50_DISP_INTERLOCK_BASE]);

for_each_new_mst_mgr_in_state(state, mgr, mst_state, i) {
mstm = nv50_mstm(mgr);


if (mstm->modified)


	nv50_mstm_prepare(state, mst_state, mstm);




drm_for_each_encoder(encoder, drm->dev) {
if (encoder->encoder_type != DRM_MODE_ENCODER_DPMST) {


	mstm = nouveau_encoder(encoder)->dp.mstm;


	if (mstm && mstm->modified)


		nv50_mstm_prepare(mstm);


}

}

core->func->ntfy_init(disp->sync, NV50_DISP_CORE_NTFY);
@@ -1924,10 +1933,12 @@ nv50_disp_atomic_commit_core(struct drm_atomic_state *state, u32 *interlock)
   			       disp->core->chan.base.device))
   	NV_ERROR(drm, "core notifier timeout\n");

for_each_new_mst_mgr_in_state(state, mgr, mst_state, i) {
mstm = nv50_mstm(mgr);


if (mstm->modified)


	nv50_mstm_cleanup(state, mst_state, mstm);




drm_for_each_encoder(encoder, drm->dev) {
if (encoder->encoder_type != DRM_MODE_ENCODER_DPMST) {


	mstm = nouveau_encoder(encoder)->dp.mstm;


	if (mstm && mstm->modified)


		nv50_mstm_cleanup(mstm);


}

}

}
 
diff --git a/include/drm/display/drm_dp_mst_helper.h b/include/drm/display/drm_dp_mst_helper.h
index 41fd8352ab65..6b8f738bd622 100644
--- a/include/drm/display/drm_dp_mst_helper.h
+++ b/include/drm/display/drm_dp_mst_helper.h
@@ -48,6 +48,20 @@ struct drm_dp_mst_topology_ref_history {
 
 struct drm_dp_mst_branch;
 
+/**


struct drm_dp_vcpi - Virtual Channel Payload Identifier



@vcpi: Virtual channel ID.



@pbn: Payload Bandwidth Number for this channel



@aligned_pbn: PBN aligned with slot size



@num_slots: number of slots for this PBN


*/

+struct drm_dp_vcpi {

int vcpi;
int pbn;
int aligned_pbn;
int num_slots;

+};



/**

struct drm_dp_mst_port - MST port
@port_num: port number

@@ -131,6 +145,7 @@ struct drm_dp_mst_port {
   struct drm_dp_aux *passthrough_aux;
   struct drm_dp_mst_branch *parent;

struct drm_dp_vcpi vcpi;
struct drm_connector *connector;
struct drm_dp_mst_topology_mgr *mgr;

@@ -515,6 +530,19 @@ struct drm_dp_mst_topology_cbs {
   void (*poll_hpd_irq)(struct drm_dp_mst_topology_mgr *mgr);
 };
 
+#define DP_MAX_PAYLOAD (sizeof(unsigned long) * 8)



+#define DP_PAYLOAD_LOCAL 1
+#define DP_PAYLOAD_REMOTE 2
+#define DP_PAYLOAD_DELETE_LOCAL 3



+struct drm_dp_payload {

int payload_state;
int start_slot;
int num_slots;
int vcpi;

+};



#define to_dp_mst_topology_state(x) container_of(x, struct drm_dp_mst_topology_state, base)
 
 /**
@@ -527,34 +555,6 @@ struct drm_dp_mst_atomic_payload {
   /** @port: The MST port assigned to this payload */
   struct drm_dp_mst_port *port;

/**
* @vc_start_slot: The time slot that this payload starts on. Because payload start slots


* can't be determined ahead of time, the contents of this value are UNDEFINED at atomic


* check time. This shouldn't usually matter, as the start slot should never be relevant for


* atomic state computations.


*


* Since this value is determined at commit time instead of check time, this value is


* protected by the MST helpers ensuring that async commits operating on the given topology


* never run in parallel. In the event that a driver does need to read this value (e.g. to


* inform hardware of the starting timeslot for a payload), the driver may either:


*


* * Read this field during the atomic commit after


*   drm_dp_mst_atomic_wait_for_dependencies() has been called, which will ensure the


*   previous MST states payload start slots have been copied over to the new state. Note


*   that a new start slot won't be assigned/removed from this payload until


*   drm_dp_add_payload_part1()/drm_dp_remove_payload() have been called.


* * Acquire the MST modesetting lock, and then wait for any pending MST-related commits to


*   get committed to hardware by calling drm_crtc_commit_wait() on each of the


*   &drm_crtc_commit structs in &drm_dp_mst_topology_state.commit_deps.


*


* If neither of the two above solutions suffice (e.g. the driver needs to read the start


* slot in the middle of an atomic commit without waiting for some reason), then drivers


* should cache this value themselves after changing payloads.


*/


s8 vc_start_slot;

/** @vcpi: The Virtual Channel Payload Identifier */
u8 vcpi;
/**
@time_slots:
The number of timeslots allocated to this payload from the source DP Tx to



@@ -582,6 +582,8 @@ struct drm_dp_mst_topology_state {
   /** @base: Base private state for atomic */
   struct drm_private_state base;

/** @payloads: The list of payloads being created/destroyed in this state */
struct list_head payloads;
/** @mgr: The topology manager */
struct drm_dp_mst_topology_mgr *mgr;

@@ -598,21 +600,10 @@ struct drm_dp_mst_topology_state {
   /** @num_commit_deps: The number of CRTC commits in @commit_deps */
   size_t num_commit_deps;

/** @payload_mask: A bitmask of allocated VCPIs, used for VCPI assignments */
u32 payload_mask;
/** @payloads: The list of payloads being created/destroyed in this state */
struct list_head payloads;
/** @total_avail_slots: The total number of slots this topology can handle (63 or 64) */
 u8 total_avail_slots;
 /** @start_slot: The first usable time slot in this topology (1 or 0) */
 u8 start_slot;

/**
* @pbn_div: The current PBN divisor for this topology. The driver is expected to fill this


* out itself.


*/


int pbn_div;

};
 
 #define to_dp_mst_topology_mgr(x) container_of(x, struct drm_dp_mst_topology_mgr, base)
@@ -652,6 +643,14 @@ struct drm_dp_mst_topology_mgr {
    * @max_payloads: maximum number of payloads the GPU can generate.
    */
   int max_payloads;

/**
* @max_lane_count: maximum number of lanes the GPU can drive.


*/


int max_lane_count;
/**
* @max_link_rate: maximum link rate per lane GPU can output, in kHz.


*/


int max_link_rate;
/**
@conn_base_id: DRM connector ID this mgr is connected to. Only used
to build the MST connector path value.



@@ -694,20 +693,6 @@ struct drm_dp_mst_topology_mgr {
    */
   bool payload_id_table_cleared : 1;

/**
* @payload_count: The number of currently active payloads in hardware. This value is only


* intended to be used internally by MST helpers for payload tracking, and is only safe to


* read/write from the atomic commit (not check) context.


*/


u8 payload_count;

/**
* @next_start_slot: The starting timeslot to use for new VC payloads. This value is used


* internally by MST helpers for payload tracking, and is only safe to read/write from the


* atomic commit (not check) context.


*/


u8 next_start_slot;
/**
@mst_primary: Pointer to the primary/first branch device.

*/

@@ -721,6 +706,10 @@ struct drm_dp_mst_topology_mgr {
    * @sink_count: Sink count from DEVICE_SERVICE_IRQ_VECTOR_ESI0.
    */
   u8 sink_count;

/**
* @pbn_div: PBN to slots divisor.


*/


int pbn_div;

/**
    * @funcs: Atomic helper callbacks
@@ -737,6 +726,32 @@ struct drm_dp_mst_topology_mgr {
    */
   struct list_head tx_msg_downq;

/**
* @payload_lock: Protect payload information.


*/


struct mutex payload_lock;
/**
* @proposed_vcpis: Array of pointers for the new VCPI allocation. The


* VCPI structure itself is &drm_dp_mst_port.vcpi, and the size of


* this array is determined by @max_payloads.


*/


struct drm_dp_vcpi **proposed_vcpis;
/**
* @payloads: Array of payloads. The size of this array is determined


* by @max_payloads.


*/


struct drm_dp_payload *payloads;
/**
* @payload_mask: Elements of @payloads actually in use. Since


* reallocation of active outputs isn't possible gaps can be created by


* disabling outputs out of order compared to how they've been enabled.


*/


unsigned long payload_mask;
/**
* @vcpi_mask: Similar to @payload_mask, but for @proposed_vcpis.


*/


unsigned long vcpi_mask;
/**
@tx_waitq: Wait to queue stall for the tx worker.

*/

@@ -808,7 +823,9 @@ struct drm_dp_mst_topology_mgr {
 int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr,
   			 struct drm_device *dev, struct drm_dp_aux *aux,
   			 int max_dpcd_transaction_bytes,

		 int max_payloads, int conn_base_id);




		 int max_payloads,


		 int max_lane_count, int max_link_rate,


		 int conn_base_id);



void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr);
 
@@ -831,17 +848,28 @@ int drm_dp_get_vc_payload_bw(const struct drm_dp_mst_topology_mgr *mgr,
 
 int drm_dp_calc_pbn_mode(int clock, int bpp, bool dsc);
 
+bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr,

	      struct drm_dp_mst_port *port, int pbn, int slots);




+int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);




+void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);



void drm_dp_mst_update_slots(struct drm_dp_mst_topology_state *mst_state, uint8_t link_encoding_cap);
 
-int drm_dp_add_payload_part1(struct drm_dp_mst_topology_mgr *mgr,

	     struct drm_dp_mst_topology_state *mst_state,


	     struct drm_dp_mst_atomic_payload *payload);



-int drm_dp_add_payload_part2(struct drm_dp_mst_topology_mgr *mgr,

	     struct drm_atomic_state *state,


	     struct drm_dp_mst_atomic_payload *payload);



-void drm_dp_remove_payload(struct drm_dp_mst_topology_mgr *mgr,

	   struct drm_dp_mst_topology_state *mst_state,


	   struct drm_dp_mst_atomic_payload *payload);



+void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr,

		struct drm_dp_mst_port *port);





+int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr,

	   int pbn);





+int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr, int start_slot);




+int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr);
 
 int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr);
 
@@ -863,22 +891,17 @@ int drm_dp_mst_connector_late_register(struct drm_connector *connector,
 void drm_dp_mst_connector_early_unregister(struct drm_connector *connector,
   				   struct drm_dp_mst_port *port);
 
-struct drm_dp_mst_topology_state *
-drm_atomic_get_mst_topology_state(struct drm_atomic_state *state,

		  struct drm_dp_mst_topology_mgr *mgr);



-struct drm_dp_mst_topology_state *
-drm_atomic_get_new_mst_topology_state(struct drm_atomic_state *state,

		      struct drm_dp_mst_topology_mgr *mgr);



-struct drm_dp_mst_atomic_payload *
-drm_atomic_get_mst_payload_state(struct drm_dp_mst_topology_state *state,

		 struct drm_dp_mst_port *port);



+struct drm_dp_mst_topology_state *drm_atomic_get_mst_topology_state(struct drm_atomic_state *state,

						    struct drm_dp_mst_topology_mgr *mgr);



int __must_check
 drm_dp_atomic_find_time_slots(struct drm_atomic_state *state,
   		      struct drm_dp_mst_topology_mgr *mgr,

	      struct drm_dp_mst_port *port, int pbn);




	      struct drm_dp_mst_port *port, int pbn,


	      int pbn_div);



int drm_dp_mst_atomic_enable_dsc(struct drm_atomic_state *state,
   			 struct drm_dp_mst_port *port,

		 int pbn, bool enable);




		 int pbn, int pbn_div,


		 bool enable);



int __must_check
 drm_dp_mst_add_affected_dsc_crtcs(struct drm_atomic_state *state,
   			  struct drm_dp_mst_topology_mgr *mgr);
@@ -902,12 +925,6 @@ void drm_dp_mst_put_port_malloc(struct drm_dp_mst_port *port);
 
 struct drm_dp_aux *drm_dp_mst_dsc_aux_for_port(struct drm_dp_mst_port *port);
 
-static inline struct drm_dp_mst_topology_state *
-to_drm_dp_mst_topology_state(struct drm_private_state *state)
-{

return container_of(state, struct drm_dp_mst_topology_state, base);

-}



extern const struct drm_private_state_funcs drm_dp_mst_topology_state_funcs;
 
 /**
-- 
Jani Nikula, Intel Open Source Graphics Center
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

    

2024

2023

2022

2021

2020

2019

2018

2017

Re: [PATCH] Revert "drm/display/dp_mst: Move all payload info into the atomic state"