Re: [PATCH] drm/i915/mso: using joiner is not possible with eDP MSO

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Fri, Jun 14, 2024 at 05:23:11PM +0300, Jani Nikula wrote:
> It's not possible to use the joiner at the same time with eDP MSO. When
> a panel needs MSO, it's not optional, so MSO trumps joiner.
> 
> v3: Only change intel_dp_has_joiner(), leave debugfs alone (Ville)
> 
> Cc: stable@vger.kernel.org
> Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/1668
> Signed-off-by: Jani Nikula <jani.nikula@intel.com>

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

> 
> ---
> 
> Just the minimal fix for starters to move things along.
> ---
>  drivers/gpu/drm/i915/display/intel_dp.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> index 9a9bb0f5b7fe..ab33c9de393a 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -465,6 +465,10 @@ bool intel_dp_has_joiner(struct intel_dp *intel_dp)
>  	struct intel_encoder *encoder = &intel_dig_port->base;
>  	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
>  
> +	/* eDP MSO is not compatible with joiner */
> +	if (intel_dp->mso_link_count)
> +		return false;
> +
>  	return DISPLAY_VER(dev_priv) >= 12 ||
>  		(DISPLAY_VER(dev_priv) == 11 &&
>  		 encoder->port != PORT_A);
> -- 
> 2.39.2

-- 
Ville Syrjälä
Intel