diff options
| author | Jaehyun Chung <jaehyun.chung@amd.com> | 2020-08-06 00:28:53 +0300 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2020-08-17 21:09:06 +0300 |
| commit | e0f7ff99c92ff5e033e169c30cff607ff7c17192 (patch) | |
| tree | 729e7cb863247456840ebf7acc24f4d1cbc2a52a /drivers/gpu/drm/amd/display/dc/dsc | |
| parent | 5ab7943187f22b572fd12d517bd699771b88ce91 (diff) | |
| download | linux-e0f7ff99c92ff5e033e169c30cff607ff7c17192.tar.xz | |
drm/amd/display: Mask DPCD field to avoid reading unsupported field value
[Why]
DSC will be disabled if DPCD 0006F[6:3] is set to a non-zero value
because bits 6:3 are not currently supported. When 6:3 is populated, an
unsupported INCREMENT OF bits_per_pixel value is read (DPCD 0006F[2:0])
[How]
Mask the INCREMENT OF bits_per_pixel field so that values in the
unsupported field are ignored.
Signed-off-by: Jaehyun Chung <jaehyun.chung@amd.com>
Reviewed-by: Wenjing Liu <Wenjing.Liu@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/dsc')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c b/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c index da1b654833d5..4c844cfaa956 100644 --- a/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c +++ b/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c @@ -192,8 +192,10 @@ static bool dsc_throughput_from_dpcd(int dpcd_throughput, int *throughput) } -static bool dsc_bpp_increment_div_from_dpcd(int bpp_increment_dpcd, uint32_t *bpp_increment_div) +static bool dsc_bpp_increment_div_from_dpcd(uint8_t bpp_increment_dpcd, uint32_t *bpp_increment_div) { + // Mask bpp increment dpcd field to avoid reading other fields + bpp_increment_dpcd &= 0x7; switch (bpp_increment_dpcd) { case 0: |