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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/drivers/gpu/drm/drm_rect.c
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@@ -24,7 +24,9 @@
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 #include <linux/errno.h>
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 #include <linux/export.h>
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 #include <linux/kernel.h>
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-#include <drm/drmP.h>
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+
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+#include <drm/drm_mode.h>
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+#include <drm/drm_print.h>
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 #include <drm/drm_rect.h>
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 /**
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@@ -50,14 +52,17 @@
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 }
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 EXPORT_SYMBOL(drm_rect_intersect);
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-static u32 clip_scaled(u32 src, u32 dst, u32 clip)
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+static u32 clip_scaled(int src, int dst, int *clip)
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 {
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 	u64 tmp;
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 	if (dst == 0)
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 		return 0;
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-	tmp = mul_u32_u32(src, dst - clip);
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+	/* Only clip what we have. Keeps the result bounded. */
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+	*clip = min(*clip, dst);
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+
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+	tmp = mul_u32_u32(src, dst - *clip);
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 	/*
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 	 * Round toward 1.0 when clipping so that we don't accidentally
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@@ -76,11 +81,13 @@
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  * @clip: clip rectangle
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  *
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  * Clip rectangle @dst by rectangle @clip. Clip rectangle @src by the
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- * same amounts multiplied by @hscale and @vscale.
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+ * the corresponding amounts, retaining the vertical and horizontal scaling
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+ * factors from @src to @dst.
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  *
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  * RETURNS:
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+ *
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  * %true if rectangle @dst is still visible after being clipped,
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- * %false otherwise
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+ * %false otherwise.
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  */
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 bool drm_rect_clip_scaled(struct drm_rect *src, struct drm_rect *dst,
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 			  const struct drm_rect *clip)
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@@ -90,34 +97,34 @@
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 	diff = clip->x1 - dst->x1;
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 	if (diff > 0) {
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 		u32 new_src_w = clip_scaled(drm_rect_width(src),
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-					    drm_rect_width(dst), diff);
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+					    drm_rect_width(dst), &diff);
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-		src->x1 = clamp_t(int64_t, src->x2 - new_src_w, INT_MIN, INT_MAX);
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-		dst->x1 = clip->x1;
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+		src->x1 = src->x2 - new_src_w;
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+		dst->x1 += diff;
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 	}
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 	diff = clip->y1 - dst->y1;
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 	if (diff > 0) {
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 		u32 new_src_h = clip_scaled(drm_rect_height(src),
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-					    drm_rect_height(dst), diff);
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+					    drm_rect_height(dst), &diff);
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-		src->y1 = clamp_t(int64_t, src->y2 - new_src_h, INT_MIN, INT_MAX);
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-		dst->y1 = clip->y1;
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+		src->y1 = src->y2 - new_src_h;
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+		dst->y1 += diff;
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 	}
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 	diff = dst->x2 - clip->x2;
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 	if (diff > 0) {
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 		u32 new_src_w = clip_scaled(drm_rect_width(src),
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-					    drm_rect_width(dst), diff);
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+					    drm_rect_width(dst), &diff);
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-		src->x2 = clamp_t(int64_t, src->x1 + new_src_w, INT_MIN, INT_MAX);
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-		dst->x2 = clip->x2;
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+		src->x2 = src->x1 + new_src_w;
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+		dst->x2 -= diff;
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 	}
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 	diff = dst->y2 - clip->y2;
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 	if (diff > 0) {
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 		u32 new_src_h = clip_scaled(drm_rect_height(src),
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-					    drm_rect_height(dst), diff);
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+					    drm_rect_height(dst), &diff);
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-		src->y2 = clamp_t(int64_t, src->y1 + new_src_h, INT_MIN, INT_MAX);
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-		dst->y2 = clip->y2;
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+		src->y2 = src->y1 + new_src_h;
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+		dst->y2 -= diff;
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 	}
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 	return drm_rect_visible(dst);
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@@ -211,114 +218,6 @@
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 	return vscale;
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 }
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 EXPORT_SYMBOL(drm_rect_calc_vscale);
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-
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-/**
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- * drm_calc_hscale_relaxed - calculate the horizontal scaling factor
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- * @src: source window rectangle
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- * @dst: destination window rectangle
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- * @min_hscale: minimum allowed horizontal scaling factor
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- * @max_hscale: maximum allowed horizontal scaling factor
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- *
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- * Calculate the horizontal scaling factor as
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- * (@src width) / (@dst width).
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- *
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- * If the calculated scaling factor is below @min_vscale,
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- * decrease the height of rectangle @dst to compensate.
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- *
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- * If the calculated scaling factor is above @max_vscale,
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- * decrease the height of rectangle @src to compensate.
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- *
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- * If the scale is below 1 << 16, round down. If the scale is above
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- * 1 << 16, round up. This will calculate the scale with the most
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- * pessimistic limit calculation.
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- *
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- * RETURNS:
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- * The horizontal scaling factor.
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- */
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-int drm_rect_calc_hscale_relaxed(struct drm_rect *src,
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-				 struct drm_rect *dst,
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-				 int min_hscale, int max_hscale)
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-{
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-	int src_w = drm_rect_width(src);
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-	int dst_w = drm_rect_width(dst);
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-	int hscale = drm_calc_scale(src_w, dst_w);
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-
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-	if (hscale < 0 || dst_w == 0)
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-		return hscale;
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-
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-	if (hscale < min_hscale) {
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-		int max_dst_w = src_w / min_hscale;
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-
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-		drm_rect_adjust_size(dst, max_dst_w - dst_w, 0);
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-
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-		return min_hscale;
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-	}
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-
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-	if (hscale > max_hscale) {
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-		int max_src_w = dst_w * max_hscale;
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-
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-		drm_rect_adjust_size(src, max_src_w - src_w, 0);
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-
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-		return max_hscale;
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-	}
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-
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-	return hscale;
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-}
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-EXPORT_SYMBOL(drm_rect_calc_hscale_relaxed);
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-
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-/**
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- * drm_rect_calc_vscale_relaxed - calculate the vertical scaling factor
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- * @src: source window rectangle
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- * @dst: destination window rectangle
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- * @min_vscale: minimum allowed vertical scaling factor
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- * @max_vscale: maximum allowed vertical scaling factor
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- *
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- * Calculate the vertical scaling factor as
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- * (@src height) / (@dst height).
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- *
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- * If the calculated scaling factor is below @min_vscale,
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- * decrease the height of rectangle @dst to compensate.
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- *
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- * If the calculated scaling factor is above @max_vscale,
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- * decrease the height of rectangle @src to compensate.
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- *
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- * If the scale is below 1 << 16, round down. If the scale is above
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- * 1 << 16, round up. This will calculate the scale with the most
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- * pessimistic limit calculation.
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- *
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- * RETURNS:
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- * The vertical scaling factor.
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- */
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-int drm_rect_calc_vscale_relaxed(struct drm_rect *src,
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-				 struct drm_rect *dst,
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-				 int min_vscale, int max_vscale)
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-{
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-	int src_h = drm_rect_height(src);
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-	int dst_h = drm_rect_height(dst);
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-	int vscale = drm_calc_scale(src_h, dst_h);
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-
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-	if (vscale < 0 || dst_h == 0)
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-		return vscale;
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-
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-	if (vscale < min_vscale) {
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-		int max_dst_h = src_h / min_vscale;
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-
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-		drm_rect_adjust_size(dst, 0, max_dst_h - dst_h);
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-
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-		return min_vscale;
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-	}
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-
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-	if (vscale > max_vscale) {
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-		int max_src_h = dst_h * max_vscale;
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-
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-		drm_rect_adjust_size(src, 0, max_src_h - src_h);
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-
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-		return max_vscale;
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-	}
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-
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-	return vscale;
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-}
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-EXPORT_SYMBOL(drm_rect_calc_vscale_relaxed);
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 /**
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  * drm_rect_debug_print - print the rectangle information