Re: [PATCH v4 2/2] drm/i915/display: Disable pipe joiner on WCL

["Borah, Chaitanya Kumar" <chaitanya.kumar.borah@intel.com>]

On 10/28/2026 12:34 PM, Vidya Srinivas wrote:
> Pipe joining is not supported in the WCL display configuration.
> Report no joiner support on WCL so that modes which would require
> joining are rejected, matching the 4k 60Hz maximum resolution
> documented for the platform.
> 
> v2: Rebase onto latest upstream
> v3: Fix up the commit message
> v4: Split the scaler and joiner changes into separate patches (Jani)
> 
> Bspec: 74286
> Cc: stable@vger.kernel.org

Won't we need a Fixes tag to tell where this change need to go to?

> Suggested-by: Charlton Lin <charlton.lin@intel.com>
> Reviewed-by: Uma Shankar <uma.shankar@intel.com>
> Signed-off-by: Vidya Srinivas <vidya.srinivas@intel.com>
> ---
>   drivers/gpu/drm/i915/display/intel_dp.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> index 00e02e019d25..ef164a797618 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -485,9 +485,9 @@ bool intel_dp_has_joiner(struct intel_dp *intel_dp)
>   			return false;
>   	}
>   
> -	return DISPLAY_VER(display) >= 12 ||
> +	return ((DISPLAY_VER(display) >= 12 && DISPLAY_VERx100(display) != 3002) ||
>   		(DISPLAY_VER(display) == 11 &&
> -		 encoder->port != PORT_A);
> +		 encoder->port != PORT_A));
>   }
>   
>   static int dg2_max_source_rate(struct intel_dp *intel_dp)