Commit 400443e8 authored by Mikita Lipski's avatar Mikita Lipski Committed by Alex Deucher

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/106959Signed-off-by: default avatarMikita Lipski <mikita.lipski@amd.com>
Tested-by: default avatarMike Lothian <mike@fireburn.co.uk>
Reviewed-by: default avatarHarry Wentland <harry.wentland@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent fe61a2f1
......@@ -2176,6 +2176,46 @@ 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 void
......@@ -2232,6 +2272,8 @@ 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);
}
static void fill_audio_info(struct audio_info *audio_info,
......
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