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drm/amd/display: Fix Mode Cutoff in DSC Passthrough to DP2.1 Monitor

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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>
This commit is contained in:
Fangzhi Zuo
2024-12-02 13:30:37 -05:00
committed by Alex Deucher
parent e823421d6c
commit e56ad45e99
1 changed files with 3 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
View File

@@ -1688,16 +1688,16 @@ 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,