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| author | Alvin Lee <alvin.lee2@amd.com> | 2023-12-01 06:25:07 -0700 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2023-12-06 15:59:17 -0500 |
| commit | fec05adc40c25a028c9dfa9d540f800a2d433f80 (patch) | |
| tree | 5ae3e9616646bb755a4ee89d3a58015493c23be1 | |
| parent | d6a57588666301acd9d42d3b00d74240964f07f6 (diff) | |
| download | linux-fec05adc40c25a028c9dfa9d540f800a2d433f80.tar.gz | |
drm/amd/display: Use channel_width = 2 for vram table 3.0
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 This is because channel_width in the vram table no longer
represents the memory width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>
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/bios/bios_parser2.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/bios/bios_parser2.c b/drivers/gpu/drm/amd/display/dc/bios/bios_parser2.c index 7cdb1a8a0ba06b..6a96810a477e67 100644 --- a/drivers/gpu/drm/amd/display/dc/bios/bios_parser2.c +++ b/drivers/gpu/drm/amd/display/dc/bios/bios_parser2.c @@ -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 This is because the channel_width + * param in the VRAM info table is changed in 7000 series and + * no longer represents the memory channel width.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; } |