Re: [PATCH 16/16] drm/i915/display: Extend the max dotclock limit to WCL and pre PTL platforms

[Imre Deak <imre.deak@intel.com>]

On Wed, Jan 28, 2026 at 07:36:36PM +0530, Ankit Nautiyal wrote:
> From: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
> 
> Add upper limit check for pixel clock for WCL and pre PTL platforms.
> 
> BSpec: 49199, 68912
> Signed-off-by: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
> Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>

Reviewed-by: Imre Deak <imre.deak@intel.com>

I'd like to ask to merge this one patch separately from the patchset
once it's clarified why the limits are not used in Windows for ICL-MTL.

> ---
>  drivers/gpu/drm/i915/display/intel_display.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index 9cfeb5530fd8..2cd950b57918 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -8006,8 +8006,14 @@ int intel_max_uncompressed_dotclock(struct intel_display *display)
>  	int max_dotclock = display->cdclk.max_dotclk_freq;
>  	int limit = max_dotclock;
>  
> -	if (DISPLAY_VER(display) >= 30)
> +	if (DISPLAY_VERx100(display) == 3002)
> +		limit = 937500;
> +	else if (DISPLAY_VER(display) >= 30)
>  		limit = 1350000;
> +	else if (DISPLAY_VER(display) >= 13)
> +		limit = 1200000;
> +	else
> +		limit = 1100000;
>  
>  	return min(max_dotclock, limit);
>  }
> -- 
> 2.45.2
>