Re: [PATCH] drm/i915/display: Disable casf with joiner

[Jani Nikula <jani.nikula@linux.intel.com>]

On Mon, 05 Jan 2026, Nemesa Garg <nemesa.garg@intel.com> wrote:
> Currently pipe scaling is not supported with the
> joiner. As casf requires pipe scaling, fail the
> atomic commit whenever joiner comes into picture.
>
> Signed-off-by: Nemesa Garg <nemesa.garg@intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_casf.c | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_casf.c b/drivers/gpu/drm/i915/display/intel_casf.c
> index 95339b496f24..259bc50d5ed8 100644
> --- a/drivers/gpu/drm/i915/display/intel_casf.c
> +++ b/drivers/gpu/drm/i915/display/intel_casf.c
> @@ -116,6 +116,11 @@ int intel_casf_compute_config(struct intel_crtc_state *crtc_state)
>  		return 0;
>  	}
>  
> +	if (crtc_state->joiner_pipes) {
> +		drm_WARN(display->drm, 0, "CASF not supported with joiner\n");

With a backtrace?!

> +		return -EINVAL;
> +	}
> +
>  	crtc_state->hw.casf_params.casf_enable = true;
>  
>  	/*

-- 
Jani Nikula, Intel