diff options
| author | Wenjing Liu <wenjing.liu@amd.com> | 2021-04-09 14:55:18 -0400 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2021-04-28 23:35:50 -0400 |
| commit | 642d3a2bf234578da83ed1fb6ef87dba36d31dea (patch) | |
| tree | 371a293d776df14c218c31866079385fc466ff6c /drivers/gpu/drm/amd/display/dc/core/dc_link.c | |
| parent | abf1f863e08dc23764ce617dd55e1b533e525a3f (diff) | |
| download | linux-642d3a2bf234578da83ed1fb6ef87dba36d31dea.tar.bz2 | |
drm/amd/display: take max dsc stream bandwidth overhead into account
[why]
As hardware team suggested that we need to add a max dsc bw overhead
into existing stream bandwidth when DSC is used.
The formula as below:
max_dsc_bw_overhead =
v_addressable * slice_count * 256 bit * pixel clock / v_total / h_total
effective stream bandwidth = pixel clock * bpp
stream bandwidth = effective stream bandwidth + dsc stream overhead
Signed-off-by: Wenjing Liu <wenjing.liu@amd.com>
Reviewed-by: Eric Bernstein <Eric.Bernstein@amd.com>
Acked-by: Wayne Lin <waynelin@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/core/dc_link.c')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/core/dc_link.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c index 931fbb4d6169..8bbed9c90c5d 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c @@ -3486,9 +3486,10 @@ uint32_t dc_bandwidth_in_kbps_from_timing( uint32_t kbps; #if defined(CONFIG_DRM_AMD_DC_DCN) - if (timing->flags.DSC) { - return dc_dsc_stream_bandwidth_in_kbps(timing->pix_clk_100hz, timing->dsc_cfg.bits_per_pixel); - } + if (timing->flags.DSC) + return dc_dsc_stream_bandwidth_in_kbps(timing, + timing->dsc_cfg.bits_per_pixel, + timing->dsc_cfg.num_slices_h); #endif switch (timing->display_color_depth) { |