For YCbCr420 output, scaler is required for downsampling. Scaler can be used only when source size smaller than max_src_w and max_src_h as defined by for the platform. So go for native YCbCr420 only if there are no scaler constraints.
v2: Corrected max-width based on Display Version. v3: Updated max-width as per latest Bspec change. Signed-off-by: Ankit Nautiyal <[email protected]> --- drivers/gpu/drm/i915/display/intel_dp.c | 41 ++++++++++++++++++++++--- 1 file changed, 37 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index 81fbef30c469..f99bf52171fd 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -804,11 +804,36 @@ u8 intel_dp_dsc_get_slice_count(struct intel_dp *intel_dp, return 0; } +static bool +ycbcr420_scaler_constraints(struct drm_i915_private *i915, + const struct drm_display_mode *mode) +{ + int max_src_w, max_src_h; + + if (DISPLAY_VER(i915) < 11) { + max_src_w = 4096; + max_src_h = 4096; + } else if (DISPLAY_VER(i915) < 12) { + max_src_w = 5120; + max_src_h = 4096; + } else if (DISPLAY_VER(i915) < 14) { + max_src_w = 5120; + max_src_h = 8192; + } else { + max_src_w = 4096; + max_src_h = 8192; + } + + return mode->hdisplay > max_src_w || mode->vdisplay > max_src_h; +} + static enum intel_output_format intel_dp_output_format(struct intel_connector *connector, + const struct drm_display_mode *mode, enum intel_output_format sink_format) { struct intel_dp *intel_dp = intel_attached_dp(connector); + struct drm_i915_private *i915 = to_i915(connector->base.dev); if (!connector->base.ycbcr_420_allowed || sink_format != INTEL_OUTPUT_FORMAT_YCBCR420) @@ -820,8 +845,15 @@ intel_dp_output_format(struct intel_connector *connector, if (intel_dp->dfp.ycbcr_444_to_420) return INTEL_OUTPUT_FORMAT_YCBCR444; - else + + /* + * For YCbCr420 output, scaler is required for downsampling + * So go for native YCbCr420 only if there are no scaler constraints. + */ + if (!ycbcr420_scaler_constraints(i915, mode)) return INTEL_OUTPUT_FORMAT_YCBCR420; + + return INTEL_OUTPUT_FORMAT_RGB; } int intel_dp_min_bpp(enum intel_output_format output_format) @@ -857,7 +889,7 @@ intel_dp_mode_min_output_bpp(struct intel_connector *connector, else sink_format = INTEL_OUTPUT_FORMAT_RGB; - output_format = intel_dp_output_format(connector, sink_format); + output_format = intel_dp_output_format(connector, mode, sink_format); return intel_dp_output_bpp(output_format, intel_dp_min_bpp(output_format)); } @@ -2053,7 +2085,8 @@ intel_dp_compute_output_format(struct intel_encoder *encoder, crtc_state->sink_format = INTEL_OUTPUT_FORMAT_RGB; } - crtc_state->output_format = intel_dp_output_format(connector, crtc_state->sink_format); + crtc_state->output_format = intel_dp_output_format(connector, adjusted_mode, + crtc_state->sink_format); ret = intel_dp_compute_link_config(encoder, crtc_state, conn_state, respect_downstream_limits); @@ -2063,7 +2096,7 @@ intel_dp_compute_output_format(struct intel_encoder *encoder, return ret; crtc_state->sink_format = INTEL_OUTPUT_FORMAT_YCBCR420; - crtc_state->output_format = intel_dp_output_format(connector, + crtc_state->output_format = intel_dp_output_format(connector, adjusted_mode, crtc_state->sink_format); ret = intel_dp_compute_link_config(encoder, crtc_state, conn_state, respect_downstream_limits); -- 2.25.1
