6.6-stable review patch. If anyone has any objections, please let me know.
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From: Fangzhi Zuo Jerry.Zuo@amd.com
[ Upstream commit e56ad45e991128bf4db160b75a1d9f647a341d8f ]
Source --> DP2.1 MST hub --> DP1.4/2.1 monitor
When change from DP1.4 to DP2.1 from monitor manual, modes higher than 4k120 are all cutoff by mode validation. Switch back to DP1.4 gets all the modes up to 4k240 available to be enabled by dsc passthrough.
[why] Compared to DP1.4 link from hub to monitor, DP2.1 link has larger full_pbn value that causes overflow in the process of doing conversion from pbn to kbps.
[how] Change the data type accordingly to fit into the data limit during conversion calculation.
Tested-by: Daniel Wheeler daniel.wheeler@amd.com Reviewed-by: Wayne Lin wayne.lin@amd.com Signed-off-by: Fangzhi Zuo Jerry.Zuo@amd.com Signed-off-by: Rodrigo Siqueira rodrigo.siqueira@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
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 385a5a75fdf87..5858e288b3fd6 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 @@ -1578,16 +1578,16 @@ int pre_validate_dsc(struct drm_atomic_state *state, return ret; }
-static unsigned int kbps_from_pbn(unsigned int pbn) +static uint32_t kbps_from_pbn(unsigned int pbn) { - unsigned int kbps = pbn; + uint64_t kbps = (uint64_t)pbn;
kbps *= (1000000 / PEAK_FACTOR_X1000); kbps *= 8; kbps *= 54; kbps /= 64;
- return kbps; + return (uint32_t)kbps; }
static bool is_dsc_common_config_possible(struct dc_stream_state *stream,