From: Fangzhi Zuo Date: Mon, 2 Dec 2024 18:30:37 +0000 (-0500) Subject: drm/amd/display: Fix Mode Cutoff in DSC Passthrough to DP2.1 Monitor X-Git-Tag: v6.14-rc1~174^2~14^2~31 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=e56ad45e991128bf4db160b75a1d9f647a341d8f;p=thirdparty%2Fkernel%2Flinux.git drm/amd/display: Fix Mode Cutoff in DSC Passthrough to DP2.1 Monitor 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 Reviewed-by: Wayne Lin Signed-off-by: Fangzhi Zuo Signed-off-by: Rodrigo Siqueira Signed-off-by: Alex Deucher --- 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 6e43594906130..ca864f71ae666 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 @@ -1688,16 +1688,16 @@ clean_exit: 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,