[PATCH 03/22] drm/i915: Disable live M/N updates when using bigjoiner

[Murthy, Arun R]

> -----Original Message-----
> From: Intel-gfx <intel-gfx-bounces at lists.freedesktop.org> On Behalf Of Ville
> Syrjala
> Sent: Friday, March 29, 2024 6:43 AM
> To: intel-gfx at lists.freedesktop.org
> Subject: [PATCH 03/22] drm/i915: Disable live M/N updates when using
> bigjoiner
> 
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> All joined pipes share the same transcoder/timing generator.
> Currently we just do the commits per-pipe, which doesn't really work if we need
> to change the timings at the same time. For now just disable live M/N updates
> when bigjoiner is needed.
> 
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
Reviewed-by: Arun R Murthy <arun.r.murthy at intel.com>

Thanks and Regards,
Arun R Murthy
--------------------
> ---
>  drivers/gpu/drm/i915/display/intel_dp.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c
> b/drivers/gpu/drm/i915/display/intel_dp.c
> index f755fd974da2..bc9d6efc99ee 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -2719,7 +2719,11 @@ intel_dp_drrs_compute_config(struct
> intel_connector *connector,
>  		intel_panel_downclock_mode(connector, &pipe_config-
> >hw.adjusted_mode);
>  	int pixel_clock;
> 
> -	if (has_seamless_m_n(connector))
> +	/*
> +	 * FIXME all joined pipes share the same transcoder.
> +	 * Need to account for that when updating M/N live.
> +	 */
> +	if (has_seamless_m_n(connector) && !pipe_config->bigjoiner_pipes)
>  		pipe_config->update_m_n = true;
> 
>  	if (!can_enable_drrs(connector, pipe_config, downclock_mode)) {
> --
> 2.43.2