drm/msm/dpu: Fix pixel extension sub-sampling

In _dpu_plane_setup_pixel_ext function instead of dividing just chroma
source resolution once (component 1 and 2), second component is divided
once more because src_w and src_h variable is reused between iterations.
Third component receives wrong source resolution too (from component 2).
To fix this introduce temporary variables for each iteration.

Fixes: dabfdd8 ("drm/msm/disp/dpu1: add inline rotation support for sc7280")
Signed-off-by: Vladimir Lypak <[email protected]>
Reviewed-by: Dmitry Baryshkov <[email protected]>
Patchwork: https://patchwork.freedesktop.org/patch/681921/
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Dmitry Baryshkov <[email protected]>

Author: vldly

drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c

@@ -500,13 +500,15 @@ static void _dpu_plane_setup_pixel_ext(struct dpu_hw_scaler3_cfg *scale_cfg,
 	int i;
 
 	for (i = 0; i < DPU_MAX_PLANES; i++) {
+		uint32_t w = src_w, h = src_h;
+
 		if (i == DPU_SSPP_COMP_1_2 || i == DPU_SSPP_COMP_2) {
-			src_w /= chroma_subsmpl_h;
-			src_h /= chroma_subsmpl_v;
+			w /= chroma_subsmpl_h;
+			h /= chroma_subsmpl_v;
 		}
 
-		pixel_ext->num_ext_pxls_top[i] = src_h;
-		pixel_ext->num_ext_pxls_left[i] = src_w;
+		pixel_ext->num_ext_pxls_top[i] = h;
+		pixel_ext->num_ext_pxls_left[i] = w;
 	}
 }