On Sat, Nov 30, 2024 at 01:56:34AM +0200, Cristian Ciocaltea wrote:
> Introduce the switch to YUV420 when computing the best output format and
> RGB cannot be supported for a given color depth.
>
> While at it, add a minor improvement to the debug message indicating the
> supported format.
>
> Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@xxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/display/drm_hdmi_state_helper.c | 11 ++++++-----
> 1 file changed, 6 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/display/drm_hdmi_state_helper.c b/drivers/gpu/drm/display/drm_hdmi_state_helper.c
> index 3a55881a544a519bb1254968db891c814f831a0f..b4e865e0680f35fd2d849536789f6c1f98a48258 100644
> --- a/drivers/gpu/drm/display/drm_hdmi_state_helper.c
> +++ b/drivers/gpu/drm/display/drm_hdmi_state_helper.c
> @@ -304,7 +304,7 @@ hdmi_try_format_bpc(const struct drm_connector *connector,
> return false;
> }
>
> - drm_dbg_kms(dev, "%s output format supported with %u (TMDS char rate: %llu Hz)\n",
> + drm_dbg_kms(dev, "%s output format supported with %u bpc (TMDS char rate: %llu Hz)\n",
Correct, but irrelevant. Please split to a separate commit.
> drm_hdmi_connector_get_output_format_name(fmt),
> bpc, conn_state->hdmi.tmds_char_rate);
>
> @@ -319,15 +319,16 @@ hdmi_compute_format(const struct drm_connector *connector,
> {
> struct drm_device *dev = connector->dev;
>
> - /*
> - * TODO: Add support for YCbCr420 output for HDMI 2.0 capable
> - * devices, for modes that only support YCbCr420.
> - */
> if (hdmi_try_format_bpc(connector, conn_state, mode, bpc, HDMI_COLORSPACE_RGB)) {
> conn_state->hdmi.output_format = HDMI_COLORSPACE_RGB;
> return 0;
> }
>
> + if (hdmi_try_format_bpc(connector, conn_state, mode, bpc, HDMI_COLORSPACE_YUV420)) {
> + conn_state->hdmi.output_format = HDMI_COLORSPACE_YUV420;
> + return 0;
> + }
Should we prefer YCbCr 4:2:0 over RGB?
> +
> drm_dbg_kms(dev, "Failed. No Format Supported for that bpc count.\n");
>
> return -EINVAL;
>
> --
> 2.47.0
>
--
With best wishes
Dmitry
