[PATCH v5 4/7] drm/i915/scaler: Compute scaling factors for pipe scaler

[Nautiyal, Ankit K]

On 1/15/2025 8:47 PM, Mitul Golani wrote:
> Compute scaling factors and scaler user for pipe scaler if
> particular scaler user is pipe scaler.
>
> --v2:
> - Update typo 'plane scaling' to 'pipe scaling'. [Ankit]
> - Remove FIXME tag which was added to check for pipe scaling
> factors as well. [Ankit]
> - Should be common hscale, vscale instead of local one to
> avoid garbage overwritten.
> - Typo in commit message 'perticular' to 'particular'.

Just "Fix the typos" should be sufficient.

Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal at intel.com>

>
> --v3:
> - Separate out max_scaling information. [Ankit]
> - Use max_hscale and max_vscale info instead of INT_MAX. [Ankit]
>
> Signed-off-by: Mitul Golani <mitulkumar.ajitkumar.golani at intel.com>
> ---
>   drivers/gpu/drm/i915/display/skl_scaler.c | 36 ++++++++++++++++++-----
>   1 file changed, 29 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/skl_scaler.c b/drivers/gpu/drm/i915/display/skl_scaler.c
> index a832cdccd9fa..72344044d9d3 100644
> --- a/drivers/gpu/drm/i915/display/skl_scaler.c
> +++ b/drivers/gpu/drm/i915/display/skl_scaler.c
> @@ -368,6 +368,7 @@ static int intel_atomic_setup_scaler(struct intel_crtc_state *crtc_state,
>   					&crtc_state->scaler_state;
>   	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
>   	u32 mode;
> +	int hscale, vscale, max_vscale, max_hscale;
>   
>   	if (*scaler_id < 0)
>   		*scaler_id = intel_allocate_scaler(scaler_state, crtc);
> @@ -416,15 +417,10 @@ static int intel_atomic_setup_scaler(struct intel_crtc_state *crtc_state,
>   		mode = SKL_PS_SCALER_MODE_DYN;
>   	}
>   
> -	/*
> -	 * FIXME: we should also check the scaler factors for pfit, so
> -	 * this shouldn't be tied directly to planes.
> -	 */
>   	if (plane_state && plane_state->hw.fb) {
>   		const struct drm_framebuffer *fb = plane_state->hw.fb;
>   		const struct drm_rect *src = &plane_state->uapi.src;
>   		const struct drm_rect *dst = &plane_state->uapi.dst;
> -		int hscale, vscale, max_vscale, max_hscale;
>   
>   		calculate_max_scale(crtc,
>   				    intel_format_info_is_yuv_semiplanar(fb->format, fb->modifier),
> @@ -448,11 +444,37 @@ static int intel_atomic_setup_scaler(struct intel_crtc_state *crtc_state,
>   
>   			return -EINVAL;
>   		}
> +	}
> +
> +	if (crtc_state->pch_pfit.enabled) {
> +		struct drm_rect src;
> +
> +		drm_rect_init(&src, 0, 0,
> +			      drm_rect_width(&crtc_state->pipe_src) << 16,
> +			      drm_rect_height(&crtc_state->pipe_src) << 16);
> +
> +		calculate_max_scale(crtc, 0, *scaler_id,
> +				    &max_hscale, &max_vscale);
>   
> -		scaler_state->scalers[*scaler_id].hscale = hscale;
> -		scaler_state->scalers[*scaler_id].vscale = vscale;
> +		hscale = drm_rect_calc_hscale(&src, &crtc_state->pch_pfit.dst,
> +					      0, max_hscale);
> +		vscale = drm_rect_calc_vscale(&src, &crtc_state->pch_pfit.dst,
> +					      0, max_vscale);
> +
> +		if (hscale < 0 || vscale < 0) {
> +			drm_dbg_kms(display->drm,
> +				    "Scaler %d doesn't support required pipe scaling\n",
> +				    *scaler_id);
> +			drm_rect_debug_print("src: ", &src, true);
> +			drm_rect_debug_print("dst: ", &crtc_state->pch_pfit.dst, false);
> +
> +			return -EINVAL;
> +		}
>   	}
>   
> +	scaler_state->scalers[*scaler_id].hscale = hscale;
> +	scaler_state->scalers[*scaler_id].vscale = vscale;
> +
>   	drm_dbg_kms(display->drm, "[CRTC:%d:%s] attached scaler id %u.%u to %s:%d\n",
>   		    crtc->base.base.id, crtc->base.name,
>   		    crtc->pipe, *scaler_id, name, idx);