On 2018-07-04 04:40 PM, mikita.lip...@amd.com wrote:
> From: Mikita Lipski <mikita.lip...@amd.com>
>
> [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
>
> Signed-off-by: Mikita Lipski <mikita.lip...@amd.com>
> ---
> drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 42
> +++++++++++++++++++++++
> 1 file changed, 42 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 ed09e36..c572e86 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -2218,6 +2218,46 @@ 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 check_if_display_depth_is_supported(struct dc_crtc_timing
> *timing_out,
Doesn't this update timing_out->display_color_depth? We should probably name
this something else, maybe "pick_max_supported_color_depth" or something
similar.
Harry
> + 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
> @@ -2273,6 +2313,8 @@ 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)
> + check_if_display_depth_is_supported(timing_out, info);
> }
>
> static void fill_audio_info(struct audio_info *audio_info,
>
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