While testing MST hotplug events on daisy chain monitors, find out that CLEAR_PAYLOAD_ID_TABLE is not broadcasted and payload id table is not reset. Dig in deeper and find out two parts needed to be fixed.
1. Link_Count_Total & Link_Count_Remaining of Broadcast message are incorrect. Should set lct=1 & lcr=6 2. CLEAR_PAYLOAD_ID_TABLE request message is not set as path broadcast request message. Should fix this.
Wayne Lin (2): drm/dp_mst: Revise broadcast msg lct & lcr drm/dp_mst: Set CLEAR_PAYLOAD_ID_TABLE as broadcast
drivers/gpu/drm/drm_dp_mst_topology.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-)
-- 2.17.1
[Why & How] According to DP spec, broadcast message LCT equals to 1 and LCR equals to 6. Current implementation is incorrect. Fix it.
Signed-off-by: Wayne Lin Wayne.Lin@amd.com Cc: stable@vger.kernel.org --- drivers/gpu/drm/drm_dp_mst_topology.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index 17dbed0a9800..713ef3b42054 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -2727,8 +2727,14 @@ static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr, else hdr->broadcast = 0; hdr->path_msg = txmsg->path_msg; - hdr->lct = mstb->lct; - hdr->lcr = mstb->lct - 1; + if (hdr->broadcast) { + hdr->lct = 1; + hdr->lcr = 6; + } else { + hdr->lct = mstb->lct; + hdr->lcr = mstb->lct - 1; + } + if (mstb->lct > 1) memcpy(hdr->rad, mstb->rad, mstb->lct / 2);
On Mon, Feb 22, 2021 at 12:00:26PM +0800, Wayne Lin wrote:
[Why & How] According to DP spec, broadcast message LCT equals to 1 and LCR equals to 6. Current implementation is incorrect. Fix it.
Signed-off-by: Wayne Lin Wayne.Lin@amd.com Cc: stable@vger.kernel.org
drivers/gpu/drm/drm_dp_mst_topology.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index 17dbed0a9800..713ef3b42054 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -2727,8 +2727,14 @@ static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr, else hdr->broadcast = 0; hdr->path_msg = txmsg->path_msg;
- hdr->lct = mstb->lct;
- hdr->lcr = mstb->lct - 1;
- if (hdr->broadcast) {
hdr->lct = 1;hdr->lcr = 6;- } else {
hdr->lct = mstb->lct;hdr->lcr = mstb->lct - 1;- }
- if (mstb->lct > 1) memcpy(hdr->rad, mstb->rad, mstb->lct / 2);
We should also do something about RAD no?
2.17.1
dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
On Mon, Feb 22, 2021 at 07:02:03PM +0200, Ville Syrjälä wrote:
On Mon, Feb 22, 2021 at 12:00:26PM +0800, Wayne Lin wrote:
[Why & How] According to DP spec, broadcast message LCT equals to 1 and LCR equals to 6. Current implementation is incorrect. Fix it.
Signed-off-by: Wayne Lin Wayne.Lin@amd.com Cc: stable@vger.kernel.org
drivers/gpu/drm/drm_dp_mst_topology.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index 17dbed0a9800..713ef3b42054 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -2727,8 +2727,14 @@ static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr, else hdr->broadcast = 0; hdr->path_msg = txmsg->path_msg;
- hdr->lct = mstb->lct;
- hdr->lcr = mstb->lct - 1;
- if (hdr->broadcast) {
hdr->lct = 1;hdr->lcr = 6;- } else {
hdr->lct = mstb->lct;hdr->lcr = mstb->lct - 1;- }
- if (mstb->lct > 1) memcpy(hdr->rad, mstb->rad, mstb->lct / 2);
We should also do something about RAD no?
Just skip the RAD stuff by s/mstb->lct/hdr->lct/ here I guess?
[AMD Public Use]
-----Original Message----- From: Ville Syrjälä ville.syrjala@linux.intel.com Sent: Tuesday, February 23, 2021 1:09 AM To: Lin, Wayne Wayne.Lin@amd.com Cc: Brol, Eryk Eryk.Brol@amd.com; Zhuo, Qingqing Qingqing.Zhuo@amd.com; stable@vger.kernel.org; Zuo, Jerry Jerry.Zuo@amd.com; dri-devel@lists.freedesktop.org; Kazlauskas, Nicholas Nicholas.Kazlauskas@amd.com Subject: Re: [PATCH 1/2] drm/dp_mst: Revise broadcast msg lct & lcr
On Mon, Feb 22, 2021 at 07:02:03PM +0200, Ville Syrjälä wrote:
On Mon, Feb 22, 2021 at 12:00:26PM +0800, Wayne Lin wrote:
[Why & How] According to DP spec, broadcast message LCT equals to 1 and LCR equals to 6. Current implementation is incorrect. Fix it.
Signed-off-by: Wayne Lin Wayne.Lin@amd.com Cc: stable@vger.kernel.org
drivers/gpu/drm/drm_dp_mst_topology.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index 17dbed0a9800..713ef3b42054 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -2727,8 +2727,14 @@ static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr, else hdr->broadcast = 0; hdr->path_msg = txmsg->path_msg; -hdr->lct = mstb->lct; -hdr->lcr = mstb->lct - 1; +if (hdr->broadcast) { +hdr->lct = 1; +hdr->lcr = 6; +} else { +hdr->lct = mstb->lct; +hdr->lcr = mstb->lct - 1; +}
if (mstb->lct > 1) memcpy(hdr->rad, mstb->rad, mstb->lct / 2);
We should also do something about RAD no?
Just skip the RAD stuff by s/mstb->lct/hdr->lct/ here I guess?
Thanks Ville! Since LCT=1, broadcast message doesn't have a RAD and this is taken care while we're constructing the header in drm_dp_encode_sideband_msg_hdr(). In drm_dp_encode_sideband_msg_hdr(), we skip stuffing RAD if LCT=1.
-- Ville Syrjälä Intel
Regards, Wayne Lin
On Tue, Feb 23, 2021 at 05:32:32AM +0000, Lin, Wayne wrote:
[AMD Public Use]
-----Original Message----- From: Ville Syrjälä ville.syrjala@linux.intel.com Sent: Tuesday, February 23, 2021 1:09 AM To: Lin, Wayne Wayne.Lin@amd.com Cc: Brol, Eryk Eryk.Brol@amd.com; Zhuo, Qingqing Qingqing.Zhuo@amd.com; stable@vger.kernel.org; Zuo, Jerry Jerry.Zuo@amd.com; dri-devel@lists.freedesktop.org; Kazlauskas, Nicholas Nicholas.Kazlauskas@amd.com Subject: Re: [PATCH 1/2] drm/dp_mst: Revise broadcast msg lct & lcr
On Mon, Feb 22, 2021 at 07:02:03PM +0200, Ville Syrjälä wrote:
On Mon, Feb 22, 2021 at 12:00:26PM +0800, Wayne Lin wrote:
[Why & How] According to DP spec, broadcast message LCT equals to 1 and LCR equals to 6. Current implementation is incorrect. Fix it.
Signed-off-by: Wayne Lin Wayne.Lin@amd.com Cc: stable@vger.kernel.org
drivers/gpu/drm/drm_dp_mst_topology.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index 17dbed0a9800..713ef3b42054 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -2727,8 +2727,14 @@ static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr, else hdr->broadcast = 0; hdr->path_msg = txmsg->path_msg; -hdr->lct = mstb->lct; -hdr->lcr = mstb->lct - 1; +if (hdr->broadcast) { +hdr->lct = 1; +hdr->lcr = 6; +} else { +hdr->lct = mstb->lct; +hdr->lcr = mstb->lct - 1; +}
if (mstb->lct > 1) memcpy(hdr->rad, mstb->rad, mstb->lct / 2);
We should also do something about RAD no?
Just skip the RAD stuff by s/mstb->lct/hdr->lct/ here I guess?
Thanks Ville! Since LCT=1, broadcast message doesn't have a RAD and this is taken care while we're constructing the header in drm_dp_encode_sideband_msg_hdr(). In drm_dp_encode_sideband_msg_hdr(), we skip stuffing RAD if LCT=1.
Ugh. How many levels of these do we really need... Either way I'd prefer the code be consistent so you don't have to sacrifice so many brain cells to understand what should be trivial details.
[AMD Public Use]
-----Original Message----- From: Ville Syrjälä ville.syrjala@linux.intel.com Sent: Tuesday, February 23, 2021 9:26 PM To: Lin, Wayne Wayne.Lin@amd.com Cc: Brol, Eryk Eryk.Brol@amd.com; Zhuo, Qingqing Qingqing.Zhuo@amd.com; stable@vger.kernel.org; Zuo, Jerry Jerry.Zuo@amd.com; dri-devel@lists.freedesktop.org; Kazlauskas, Nicholas Nicholas.Kazlauskas@amd.com Subject: Re: [PATCH 1/2] drm/dp_mst: Revise broadcast msg lct & lcr
On Tue, Feb 23, 2021 at 05:32:32AM +0000, Lin, Wayne wrote:
[AMD Public Use]
-----Original Message----- From: Ville Syrjälä ville.syrjala@linux.intel.com Sent: Tuesday, February 23, 2021 1:09 AM To: Lin, Wayne Wayne.Lin@amd.com Cc: Brol, Eryk Eryk.Brol@amd.com; Zhuo, Qingqing Qingqing.Zhuo@amd.com; stable@vger.kernel.org; Zuo, Jerry Jerry.Zuo@amd.com; dri-devel@lists.freedesktop.org; Kazlauskas, Nicholas Nicholas.Kazlauskas@amd.com Subject: Re: [PATCH 1/2] drm/dp_mst: Revise broadcast msg lct & lcr
On Mon, Feb 22, 2021 at 07:02:03PM +0200, Ville Syrjälä wrote:
On Mon, Feb 22, 2021 at 12:00:26PM +0800, Wayne Lin wrote:
[Why & How] According to DP spec, broadcast message LCT equals to 1 and LCR equals to 6. Current implementation is incorrect. Fix it.
Signed-off-by: Wayne Lin Wayne.Lin@amd.com Cc: stable@vger.kernel.org
drivers/gpu/drm/drm_dp_mst_topology.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index 17dbed0a9800..713ef3b42054 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -2727,8 +2727,14 @@ static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr, else hdr->broadcast = 0; hdr->path_msg = txmsg->path_msg; -hdr->lct = mstb->lct; -hdr->lcr = mstb->lct - 1; +if (hdr->broadcast) { +hdr->lct = 1; +hdr->lcr = 6; +} else { +hdr->lct = mstb->lct; +hdr->lcr = mstb->lct - 1; +}
if (mstb->lct > 1) memcpy(hdr->rad, mstb->rad, mstb->lct / 2);
We should also do something about RAD no?
Just skip the RAD stuff by s/mstb->lct/hdr->lct/ here I guess?
Thanks Ville! Since LCT=1, broadcast message doesn't have a RAD and this is taken care while we're constructing the header in drm_dp_encode_sideband_msg_hdr(). In drm_dp_encode_sideband_msg_hdr(), we skip stuffing RAD if LCT=1.
Ugh. How many levels of these do we really need... Either way I'd prefer the code be consistent so you don't have to sacrifice so many brain cells to understand what should be trivial details.
Hi Ville, Ya I know.. Currently it goes few levels to encapsulate the final mst packet.
From my understanding, this function is trying to prepare needed data and the actual mst packet header is constructed in drm_dp_encode_sideband_msg_hdr().
However, I will push another version by your suggestion. Thanks for your time!
-- Ville Syrjälä Intel
Regards, Wayne Lin
[Why & How] According to DP spec, CLEAR_PAYLOAD_ID_TABLE is a path broadcast request message and current implementation is incorrect. Fix it.
Signed-off-by: Wayne Lin Wayne.Lin@amd.com Cc: stable@vger.kernel.org --- drivers/gpu/drm/drm_dp_mst_topology.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index 713ef3b42054..6d73559046e5 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -1072,6 +1072,7 @@ static void build_clear_payload_id_table(struct drm_dp_sideband_msg_tx *msg)
req.req_type = DP_CLEAR_PAYLOAD_ID_TABLE; drm_dp_encode_sideband_req(&req, msg); + msg->path_msg = true; }
static int build_enum_path_resources(struct drm_dp_sideband_msg_tx *msg, @@ -2722,7 +2723,8 @@ static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr,
req_type = txmsg->msg[0] & 0x7f; if (req_type == DP_CONNECTION_STATUS_NOTIFY || - req_type == DP_RESOURCE_STATUS_NOTIFY) + req_type == DP_RESOURCE_STATUS_NOTIFY || + req_type == DP_CLEAR_PAYLOAD_ID_TABLE) hdr->broadcast = 1; else hdr->broadcast = 0;
On Mon, Feb 22, 2021 at 12:00:27PM +0800, Wayne Lin wrote:
[Why & How] According to DP spec, CLEAR_PAYLOAD_ID_TABLE is a path broadcast request message and current implementation is incorrect. Fix it.
Signed-off-by: Wayne Lin Wayne.Lin@amd.com Cc: stable@vger.kernel.org
drivers/gpu/drm/drm_dp_mst_topology.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index 713ef3b42054..6d73559046e5 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -1072,6 +1072,7 @@ static void build_clear_payload_id_table(struct drm_dp_sideband_msg_tx *msg) req.req_type = DP_CLEAR_PAYLOAD_ID_TABLE; drm_dp_encode_sideband_req(&req, msg);
- msg->path_msg = true;
} static int build_enum_path_resources(struct drm_dp_sideband_msg_tx *msg, @@ -2722,7 +2723,8 @@ static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr, req_type = txmsg->msg[0] & 0x7f; if (req_type == DP_CONNECTION_STATUS_NOTIFY ||
req_type == DP_RESOURCE_STATUS_NOTIFY)
req_type == DP_RESOURCE_STATUS_NOTIFY ||req_type == DP_CLEAR_PAYLOAD_ID_TABLE)
Looks correct. Reviewed-by: Ville Syrjälä ville.syrjala@linux.intel.com
Hmm. Looks like we're missing DP_POWER_DOWN_PHY and DP_POWER_UP_PHY here as well. We do try to send them as path requests, but apparently forget to mark them as broadcast messages.
else hdr->broadcast = 0; -- 2.17.1
dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
[AMD Public Use]
-----Original Message----- From: Ville Syrjälä ville.syrjala@linux.intel.com Sent: Tuesday, February 23, 2021 1:00 AM To: Lin, Wayne Wayne.Lin@amd.com Cc: dri-devel@lists.freedesktop.org; Brol, Eryk Eryk.Brol@amd.com; Zhuo, Qingqing Qingqing.Zhuo@amd.com; stable@vger.kernel.org; Zuo, Jerry Jerry.Zuo@amd.com; Kazlauskas, Nicholas Nicholas.Kazlauskas@amd.com; Dhinakaran Pandiyan dhinakaran.pandiyan@intel.com Subject: Re: [PATCH 2/2] drm/dp_mst: Set CLEAR_PAYLOAD_ID_TABLE as broadcast
On Mon, Feb 22, 2021 at 12:00:27PM +0800, Wayne Lin wrote:
[Why & How] According to DP spec, CLEAR_PAYLOAD_ID_TABLE is a path broadcast request message and current implementation is incorrect. Fix it.
Signed-off-by: Wayne Lin Wayne.Lin@amd.com Cc: stable@vger.kernel.org
drivers/gpu/drm/drm_dp_mst_topology.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index 713ef3b42054..6d73559046e5 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -1072,6 +1072,7 @@ static void build_clear_payload_id_table(struct drm_dp_sideband_msg_tx *msg)
req.req_type = DP_CLEAR_PAYLOAD_ID_TABLE; drm_dp_encode_sideband_req(&req, msg); +msg->path_msg = true; }
static int build_enum_path_resources(struct drm_dp_sideband_msg_tx *msg, @@ -2722,7 +2723,8 @@ static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr,
req_type = txmsg->msg[0] & 0x7f; if (req_type == DP_CONNECTION_STATUS_NOTIFY || -req_type == DP_RESOURCE_STATUS_NOTIFY) +req_type == DP_RESOURCE_STATUS_NOTIFY || +req_type == DP_CLEAR_PAYLOAD_ID_TABLE) hdr->broadcast = 1;
Looks correct. Reviewed-by: Ville Syrjälä ville.syrjala@linux.intel.com
Hmm. Looks like we're missing DP_POWER_DOWN_PHY and DP_POWER_UP_PHY here as well. We do try to send them as path requests, but apparently forget to mark them as broadcast messages.
Hi Ville, I also look up the spec but DP_POWER_DOWN_PHY & DP_POWER_UP_PHY seems to be defined as path or node request only. Not broadcast message. Please correct me if I'm wrong here. Appreciate for your time!
else hdr->broadcast = 0; -- 2.17.1
dri-devel mailing list dri-devel@lists.freedesktop.org https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flist s.freedesktop.org%2Fmailman%2Flistinfo%2Fdri-devel&data=04%7C01%7C Wayne.Lin%40amd.com%7C372bbed7b5354ca05f5608d8d753533a%7C3dd8961fe4884 e608e11a82d994e183d%7C0%7C0%7C637496100180287539%7CUnknown%7CTWFpbGZsb 3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D% 7C1000&sdata=2uhm9Nf31hfhf%2FbmwfqYW7b6ay9swWb8oS10Uc%2FVFRQ%3D&am p;reserved=0
-- Ville Syrjälä Intel
Regards, Wayne Lin
On Tue, Feb 23, 2021 at 05:32:36AM +0000, Lin, Wayne wrote:
[AMD Public Use]
-----Original Message----- From: Ville Syrjälä ville.syrjala@linux.intel.com Sent: Tuesday, February 23, 2021 1:00 AM To: Lin, Wayne Wayne.Lin@amd.com Cc: dri-devel@lists.freedesktop.org; Brol, Eryk Eryk.Brol@amd.com; Zhuo, Qingqing Qingqing.Zhuo@amd.com; stable@vger.kernel.org; Zuo, Jerry Jerry.Zuo@amd.com; Kazlauskas, Nicholas Nicholas.Kazlauskas@amd.com; Dhinakaran Pandiyan dhinakaran.pandiyan@intel.com Subject: Re: [PATCH 2/2] drm/dp_mst: Set CLEAR_PAYLOAD_ID_TABLE as broadcast
On Mon, Feb 22, 2021 at 12:00:27PM +0800, Wayne Lin wrote:
[Why & How] According to DP spec, CLEAR_PAYLOAD_ID_TABLE is a path broadcast request message and current implementation is incorrect. Fix it.
Signed-off-by: Wayne Lin Wayne.Lin@amd.com Cc: stable@vger.kernel.org
drivers/gpu/drm/drm_dp_mst_topology.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index 713ef3b42054..6d73559046e5 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -1072,6 +1072,7 @@ static void build_clear_payload_id_table(struct drm_dp_sideband_msg_tx *msg)
req.req_type = DP_CLEAR_PAYLOAD_ID_TABLE; drm_dp_encode_sideband_req(&req, msg); +msg->path_msg = true; }
static int build_enum_path_resources(struct drm_dp_sideband_msg_tx *msg, @@ -2722,7 +2723,8 @@ static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr,
req_type = txmsg->msg[0] & 0x7f; if (req_type == DP_CONNECTION_STATUS_NOTIFY || -req_type == DP_RESOURCE_STATUS_NOTIFY) +req_type == DP_RESOURCE_STATUS_NOTIFY || +req_type == DP_CLEAR_PAYLOAD_ID_TABLE) hdr->broadcast = 1;
Looks correct. Reviewed-by: Ville Syrjälä ville.syrjala@linux.intel.com
Hmm. Looks like we're missing DP_POWER_DOWN_PHY and DP_POWER_UP_PHY here as well. We do try to send them as path requests, but apparently forget to mark them as broadcast messages.
Hi Ville, I also look up the spec but DP_POWER_DOWN_PHY & DP_POWER_UP_PHY seems to be defined as path or node request only. Not broadcast message. Please correct me if I'm wrong here.
Doh. Yeah, you're correct. Not sure what section I was reading earlier when I came to that conclusion.
Appreciate for your time!
else hdr->broadcast = 0; -- 2.17.1
dri-devel mailing list dri-devel@lists.freedesktop.org https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flist s.freedesktop.org%2Fmailman%2Flistinfo%2Fdri-devel&data=04%7C01%7C Wayne.Lin%40amd.com%7C372bbed7b5354ca05f5608d8d753533a%7C3dd8961fe4884 e608e11a82d994e183d%7C0%7C0%7C637496100180287539%7CUnknown%7CTWFpbGZsb 3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D% 7C1000&sdata=2uhm9Nf31hfhf%2FbmwfqYW7b6ay9swWb8oS10Uc%2FVFRQ%3D&am p;reserved=0
-- Ville Syrjälä Intel
Regards, Wayne Lin
ooh, nice catches! For the whole series this is:
Reviewed-by: Lyude Paul lyude@redhat.com
I will go ahead and push these to drm-misc-next
On Mon, 2021-02-22 at 12:00 +0800, Wayne Lin wrote:
While testing MST hotplug events on daisy chain monitors, find out that CLEAR_PAYLOAD_ID_TABLE is not broadcasted and payload id table is not reset. Dig in deeper and find out two parts needed to be fixed.
- Link_Count_Total & Link_Count_Remaining of Broadcast message are
incorrect. Should set lct=1 & lcr=6 2. CLEAR_PAYLOAD_ID_TABLE request message is not set as path broadcast request message. Should fix this.
Wayne Lin (2): drm/dp_mst: Revise broadcast msg lct & lcr drm/dp_mst: Set CLEAR_PAYLOAD_ID_TABLE as broadcast
drivers/gpu/drm/drm_dp_mst_topology.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-)
-- 2.17.1
linux-stable-mirror@lists.linaro.org
-
Lin, Wayne -
Lyude Paul -
Ville Syrjälä -
Wayne Lin