diff options
| author |   Eric Yang <Eric.Yang2@amd.com> | 2018-03-23 13:56:16 -0400 |
|---|---|---|
| committer |   Alex Deucher <alexander.deucher@amd.com> | 2018-04-11 13:08:08 -0500 |
| commit | cf65ebeb687678812eb3ddd5ef253bacf7ef330a (patch) | |
| tree | 51a5e36792707c7c952a72f0157fdd6aa0154a86 /drivers/gpu/drm | |
| parent | drm/amd/display: remove unused enum (diff) | |
| download | linux-dev-cf65ebeb687678812eb3ddd5ef253bacf7ef330a.tar.xz linux-dev-cf65ebeb687678812eb3ddd5ef253bacf7ef330a.zip | |
drm/amd/display: fix link bw calculation for 422 and 420 encoding
Link bw required is reduced when we have chroma subsampling.
Signed-off-by: Eric Yang <Eric.Yang2@amd.com>
Reviewed-by: Charlene Liu <Charlene.Liu@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 53 |
1 files changed, 32 insertions, 21 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c index b86325bb636f..07cc4385a7c1 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c @@ -1378,37 +1378,48 @@ static uint32_t bandwidth_in_kbps_from_timing( { uint32_t bits_per_channel = 0; uint32_t kbps; - switch (timing->display_color_depth) { - case COLOR_DEPTH_666: - bits_per_channel = 6; - break; - case COLOR_DEPTH_888: - bits_per_channel = 8; - break; - case COLOR_DEPTH_101010: - bits_per_channel = 10; - break; - case COLOR_DEPTH_121212: + if (timing->pixel_encoding == PIXEL_ENCODING_YCBCR422) bits_per_channel = 12; - break; - case COLOR_DEPTH_141414: - bits_per_channel = 14; - break; - case COLOR_DEPTH_161616: - bits_per_channel = 16; - break; - default: - break; + else{ + + switch (timing->display_color_depth) { + + case COLOR_DEPTH_666: + bits_per_channel = 6; + break; + case COLOR_DEPTH_888: + bits_per_channel = 8; + break; + case COLOR_DEPTH_101010: + bits_per_channel = 10; + break; + case COLOR_DEPTH_121212: + bits_per_channel = 12; + break; + case COLOR_DEPTH_141414: + bits_per_channel = 14; + break; + case COLOR_DEPTH_161616: + bits_per_channel = 16; + break; + default: + break; + } } ASSERT(bits_per_channel != 0); kbps = timing->pix_clk_khz; kbps *= bits_per_channel; - if (timing->flags.Y_ONLY != 1) + if (timing->flags.Y_ONLY != 1) { /*Only YOnly make reduce bandwidth by 1/3 compares to RGB*/ kbps *= 3; + if (timing->pixel_encoding == PIXEL_ENCODING_YCBCR420) + kbps /= 2; + else if (timing->pixel_encoding == PIXEL_ENCODING_YCBCR422) + kbps = kbps * 2 / 3; + } return kbps; |