diff options
Diffstat (limited to 'common/recipes-kernel/linux/linux-yocto-4.14.71/4714-drm-amd-display-add-a-check-for-display-depth-validi.patch')
| -rw-r--r-- | common/recipes-kernel/linux/linux-yocto-4.14.71/4714-drm-amd-display-add-a-check-for-display-depth-validi.patch | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.14.71/4714-drm-amd-display-add-a-check-for-display-depth-validi.patch b/common/recipes-kernel/linux/linux-yocto-4.14.71/4714-drm-amd-display-add-a-check-for-display-depth-validi.patch new file mode 100644 index 00000000..4e2afab8 --- /dev/null +++ b/common/recipes-kernel/linux/linux-yocto-4.14.71/4714-drm-amd-display-add-a-check-for-display-depth-validi.patch @@ -0,0 +1,90 @@ +From 7456cb4d8d7f538b679b05dfa0ee7a5975d9d404 Mon Sep 17 00:00:00 2001 +From: Mikita Lipski <mikita.lipski@amd.com> +Date: Wed, 4 Jul 2018 17:27:56 -0400 +Subject: [PATCH 4714/5725] drm/amd/display: add a check for display depth + validity + +[why] +HDMI 2.0 fails to validate 4K@60 timing with 10 bpc +[how] +Adding a helper function that would verify if the display depth +assigned would pass a bandwidth validation. +Drop the display depth by one level till calculated pixel clk +is lower than maximum TMDS clk. + +Bugzilla: https://bugs.freedesktop.org/106959 + +Tested-by: Mike Lothian <mike@fireburn.co.uk> +Reviewed-by: Harry Wentland <harry.wentland@amd.com> +Signed-off-by: Mikita Lipski <mikita.lipski@amd.com> +Signed-off-by: Alex Deucher <alexander.deucher@amd.com> +Signed-off-by: Raveendra Talabattula <raveendra.talabattula@amd.com> +--- + drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 44 +++++++++++++++++++++++ + 1 file changed, 44 insertions(+) + +diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +index 8d60833..2aa0041 100644 +--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c ++++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +@@ -2364,6 +2364,47 @@ get_output_color_space(const struct dc_crtc_timing *dc_crtc_timing) + return color_space; + } + ++static void reduce_mode_colour_depth(struct dc_crtc_timing *timing_out) ++{ ++ if (timing_out->display_color_depth <= COLOR_DEPTH_888) ++ return; ++ ++ timing_out->display_color_depth--; ++} ++ ++static void adjust_colour_depth_from_display_info(struct dc_crtc_timing *timing_out, ++ const struct drm_display_info *info) ++{ ++ int normalized_clk; ++ if (timing_out->display_color_depth <= COLOR_DEPTH_888) ++ return; ++ do { ++ normalized_clk = timing_out->pix_clk_khz; ++ /* YCbCr 4:2:0 requires additional adjustment of 1/2 */ ++ if (timing_out->pixel_encoding == PIXEL_ENCODING_YCBCR420) ++ normalized_clk /= 2; ++ /* Adjusting pix clock following on HDMI spec based on colour depth */ ++ switch (timing_out->display_color_depth) { ++ case COLOR_DEPTH_101010: ++ normalized_clk = (normalized_clk * 30) / 24; ++ break; ++ case COLOR_DEPTH_121212: ++ normalized_clk = (normalized_clk * 36) / 24; ++ break; ++ case COLOR_DEPTH_161616: ++ normalized_clk = (normalized_clk * 48) / 24; ++ break; ++ default: ++ return; ++ } ++ if (normalized_clk <= info->max_tmds_clock) ++ return; ++ reduce_mode_colour_depth(timing_out); ++ ++ } while (timing_out->display_color_depth > COLOR_DEPTH_888); ++ ++} ++ + /*****************************************************************************/ + + static int +@@ -2462,6 +2503,9 @@ fill_stream_properties_from_drm_display_mode(struct dc_stream_state *stream, + stream->out_transfer_func->type = TF_TYPE_PREDEFINED; + stream->out_transfer_func->tf = TRANSFER_FUNCTION_SRGB; + ++ if (stream->sink->sink_signal == SIGNAL_TYPE_HDMI_TYPE_A) ++ adjust_colour_depth_from_display_info(timing_out, info); ++ + calculate_phy_pix_clks(stream); + } + +-- +2.7.4 + |