[PATCH 13/19] drm/i915: Skip some bw_state readout on pre-icl

[Govindapillai, Vinod]

On Tue, 2025-02-18 at 23:19 +0200, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> We only compute bw_state->data_rate and bw_state->num_active_planes
> on icl+. Do the same during readout so that we don't leave random
> junk inside the state.
> 
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_bw.c | 11 +++++++----
>  1 file changed, 7 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_bw.c b/drivers/gpu/drm/i915/display/intel_bw.c
> index 30e6f33d6f30..2a669b8535e0 100644
> --- a/drivers/gpu/drm/i915/display/intel_bw.c
> +++ b/drivers/gpu/drm/i915/display/intel_bw.c
> @@ -809,13 +809,16 @@ static int intel_bw_crtc_min_cdclk(const struct intel_crtc_state
> *crtc_state)
>  static void intel_bw_crtc_update(struct intel_bw_state *bw_state,
>  				 const struct intel_crtc_state *crtc_state)
>  {
> +	struct intel_display *display = to_intel_display(crtc_state);
>  	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
>  	struct drm_i915_private *i915 = to_i915(crtc->base.dev);
>  
> -	bw_state->data_rate[crtc->pipe] =
> -		intel_bw_crtc_data_rate(crtc_state);
> -	bw_state->num_active_planes[crtc->pipe] =
> -		intel_bw_crtc_num_active_planes(crtc_state);
> +	if (DISPLAY_VER(display) >= 11) {
> +		bw_state->data_rate[crtc->pipe] =
> +			intel_bw_crtc_data_rate(crtc_state);
> +		bw_state->num_active_planes[crtc->pipe] =
> +			intel_bw_crtc_num_active_planes(crtc_state);
> +	}
>  	bw_state->force_check_qgv = true;

This force_check_qgv can be within the display >= 11 as well.

Also does the below debug message need a tweak too to explain why those will be 0 in display < 11?
Or call this intel_bw_crtc_update() only for display >= 11 ?

With those sorted out,

Reviewed-by: Vinod Govindapillai <vinod.govindapillai at intel.com>


>  
>  	drm_dbg_kms(&i915->drm, "pipe %c data rate %u num active planes %u\n",