[PATCH] drm/connector: Allow clearing HDMI infoframes

[Dmitry Baryshkov]

On Mon, Dec 02, 2024 at 12:19:39PM -0600, Derek Foreman wrote:
> Our infoframe setting code currently lacks the ability to clear
> infoframes. For some of the infoframes, we only need to replace them,
> so if an error occurred when generating a new infoframe we would leave
> a stale frame instead of clearing the frame.
> 
> However, the Dynamic Range and Mastering (DRM) infoframe should only
> be present when displaying HDR content (ie: the HDR_OUTPUT_METADATA blob
> is set). If we can't clear infoframes, the stale DRM infoframe will
> remain and we can never set the display back to SDR mode.
> 
> With this change, we clear infoframes when they can not, or should not,
> be generated. This fixes switching to an SDR mode from an HDR one.
> 
> Fixes: f378b77227bc4 ("drm/connector: hdmi: Add Infoframes generation")
> Signed-off-by: Derek Foreman <derek.foreman at collabora.com>
> ---
>  drivers/gpu/drm/display/drm_hdmi_state_helper.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>

-- 
With best wishes
Dmitry