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drm/amd/display: Use channel_width = 2 for vram table 3.0

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VBIOS has suggested to use channel_width=2 for any ASIC that uses vram
info 3.0. This is because channel_width in the vram table no longer
represents the memory width

Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Reviewed-by: Samson Tam <samson.tam@amd.com>
Acked-by: Rodrigo Siqueira <rodrigo.siqueira@amd.com>
Signed-off-by: Alvin Lee <alvin.lee2@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alvin Lee 2023-12-01 06:25:07 -07:00 • committed by Alex Deucher
parent d6a5758866
commit fec05adc40
1 changed files with 7 additions and 1 deletions
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8
drivers/gpu/drm/amd/display/dc/bios/bios_parser2.c
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@ -2386,7 +2386,13 @@ static enum bp_result get_vram_info_v30(
return BP_RESULT_BADBIOSTABLE;
info->num_chans = info_v30->channel_num;
info->dram_channel_width_bytes = (1 << info_v30->channel_width) / 8;
/* As suggested by VBIOS we should always use
* dram_channel_width_bytes = 2 when using VRAM
* table version 3.0. This is because the channel_width
* param in the VRAM info table is changed in 7000 series and
* no longer represents the memory channel width.
*/
info->dram_channel_width_bytes = 2;
return result;
}