[Intel-gfx] [PATCH v2] drm/i915/hdmi: Prune modes that require HDMI2.1 FRL

[Shankar, Uma]

> -----Original Message-----
> From: Intel-gfx <intel-gfx-bounces at lists.freedesktop.org> On Behalf Of Ankit
> Nautiyal
> Sent: Thursday, July 21, 2022 2:17 PM
> To: intel-gfx at lists.freedesktop.org
> Subject: [Intel-gfx] [PATCH v2] drm/i915/hdmi: Prune modes that require HDMI2.1
> FRL
> 
> HDMI2.1 requires some higher resolution video modes to be enumerated only if
> HDMI2.1 Fixed Rate Link (FRL) is supported.
> Current platforms do not support FRL transmission so prune modes that require
> HDMI2.1 FRL.
> 
> v2: Fixed the condition to check for dotclock > 600.
> Return MODE_CLOCK_HIGH as mode status.

Pushed the change to drm-intel-next. Thanks for the patch and reviews.

Regards,
Uma Shankar

> Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
> Reviewed-by: Arun R Murthy <arun.r.murthy at intel.com> (v1)
> ---
>  drivers/gpu/drm/i915/display/intel_hdmi.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.c
> b/drivers/gpu/drm/i915/display/intel_hdmi.c
> index ebd91aa69dd2..a88f589351fa 100644
> --- a/drivers/gpu/drm/i915/display/intel_hdmi.c
> +++ b/drivers/gpu/drm/i915/display/intel_hdmi.c
> @@ -2001,6 +2001,15 @@ intel_hdmi_mode_valid(struct drm_connector
> *connector,
>  		clock *= 2;
>  	}
> 
> +	/*
> +	 * HDMI2.1 requires higher resolution modes like 8k60, 4K120 to be
> +	 * enumerated only if FRL is supported. Current platforms do not support
> +	 * FRL so prune the higher resolution modes that require doctclock more
> +	 * than 600MHz.
> +	 */
> +	if (clock > 600000)
> +		return MODE_CLOCK_HIGH;
> +
>  	ycbcr_420_only = drm_mode_is_420_only(&connector->display_info,
> mode);
> 
>  	status = intel_hdmi_mode_clock_valid(connector, clock, has_hdmi_sink,
> ycbcr_420_only);
> --
> 2.25.1