diff options
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 30 |
1 files changed, 23 insertions, 7 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 3b5053570229c..7d609c71394bb 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 @@ -1378,8 +1378,8 @@ static uint32_t bandwidth_in_kbps_from_timing( { uint32_t bits_per_channel = 0; uint32_t kbps; - switch (timing->display_color_depth) { + switch (timing->display_color_depth) { case COLOR_DEPTH_666: bits_per_channel = 6; break; @@ -1401,14 +1401,20 @@ static uint32_t bandwidth_in_kbps_from_timing( 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; @@ -2278,6 +2284,8 @@ static bool retrieve_link_cap(struct dc_link *link) union edp_configuration_cap edp_config_cap; union dp_downstream_port_present ds_port = { 0 }; enum dc_status status = DC_ERROR_UNEXPECTED; + uint32_t read_dpcd_retry_cnt = 3; + int i; memset(dpcd_data, '\0', sizeof(dpcd_data)); memset(&down_strm_port_count, @@ -2285,11 +2293,15 @@ static bool retrieve_link_cap(struct dc_link *link) memset(&edp_config_cap, '\0', sizeof(union edp_configuration_cap)); - status = core_link_read_dpcd( - link, - DP_DPCD_REV, - dpcd_data, - sizeof(dpcd_data)); + for (i = 0; i < read_dpcd_retry_cnt; i++) { + status = core_link_read_dpcd( + link, + DP_DPCD_REV, + dpcd_data, + sizeof(dpcd_data)); + if (status == DC_OK) + break; + } if (status != DC_OK) { dm_error("%s: Read dpcd data failed.\n", __func__); @@ -2376,6 +2388,10 @@ bool detect_dp_sink_caps(struct dc_link *link) void detect_edp_sink_caps(struct dc_link *link) { retrieve_link_cap(link); + + if (link->reported_link_cap.link_rate == LINK_RATE_UNKNOWN) + link->reported_link_cap.link_rate = LINK_RATE_HIGH2; + link->verified_link_cap = link->reported_link_cap; } |