Re: [PATCH v2] drm/msm/display: negative x/y in cursor move

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Hi,

On Tuesday 17 July 2018 04:33 AM, Carsten Behling wrote:
modesetting X11 driver may provide negative x/y cordinates in
mdp5_crtc_cursor_move call when rotation is enabled.

Cursor buffer can overlap down to its negative width/height.

ROI has to be recalculated for negative x/y indicating using the
lower/right corner of the cursor buffer and hotspot must be set
in MDP5_LM_CURSOR_XY_SRC_Y MDP5_LM_CURSOR_XY_SRC_X.

Thanks for the patch. Could you tell how to reproduce this issue
on a db410c?

I was playing with xrandr's --rotate and --reflect options to get
a rotated output, but wasn't able to generate negative x/y
co-ordinates. I'm using linaro's debian userspace, running lxqt.

Thanks,
Archit


Signed-off-by: Carsten Behling <carsten.behling@xxxxxxxxx>
---
Changes in v2:
- fixed format specifier in debug message

  drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c | 51 ++++++++++++++++++++++++++-----
  1 file changed, 43 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c
index 10271359789e..a7f4a6688fec 100644
--- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c
+++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c
@@ -65,7 +65,7 @@ struct mdp5_crtc {
  		struct drm_gem_object *scanout_bo;
  		uint64_t iova;
  		uint32_t width, height;
-		uint32_t x, y;
+		int x, y;
  	} cursor;
  };
  #define to_mdp5_crtc(x) container_of(x, struct mdp5_crtc, base)
@@ -760,20 +760,31 @@ static void get_roi(struct drm_crtc *crtc, uint32_t *roi_w, uint32_t *roi_h)
  	 * Cursor Region Of Interest (ROI) is a plane read from cursor
  	 * buffer to render. The ROI region is determined by the visibility of
  	 * the cursor point. In the default Cursor image the cursor point will
-	 * be at the top left of the cursor image, unless it is specified
-	 * otherwise using hotspot feature.
+	 * be at the top left of the cursor image.
  	 *
+	 * Without rotation:
  	 * If the cursor point reaches the right (xres - x < cursor.width) or
  	 * bottom (yres - y < cursor.height) boundary of the screen, then ROI
  	 * width and ROI height need to be evaluated to crop the cursor image
  	 * accordingly.
  	 * (xres-x) will be new cursor width when x > (xres - cursor.width)
  	 * (yres-y) will be new cursor height when y > (yres - cursor.height)
+	 *
+	 * With rotation:
+	 * We get negative x and/or y coordinates.
+	 * (cursor.width - abs(x)) will be new cursor width when x < 0
+	 * (cursor.height - abs(y)) will be new cursor width when y < 0
  	 */
-	*roi_w = min(mdp5_crtc->cursor.width, xres -
+	if (mdp5_crtc->cursor.x >= 0)
+		*roi_w = min(mdp5_crtc->cursor.width, xres -
  			mdp5_crtc->cursor.x);
-	*roi_h = min(mdp5_crtc->cursor.height, yres -
+	else
+		*roi_w = mdp5_crtc->cursor.width - abs(mdp5_crtc->cursor.x);
+	if (mdp5_crtc->cursor.y >= 0)
+		*roi_h = min(mdp5_crtc->cursor.height, yres -
  			mdp5_crtc->cursor.y);
+	else
+		*roi_h = mdp5_crtc->cursor.height - abs(mdp5_crtc->cursor.y);
  }
static void mdp5_crtc_restore_cursor(struct drm_crtc *crtc)
@@ -783,7 +794,7 @@ static void mdp5_crtc_restore_cursor(struct drm_crtc *crtc)
  	struct mdp5_kms *mdp5_kms = get_kms(crtc);
  	const enum mdp5_cursor_alpha cur_alpha = CURSOR_ALPHA_PER_PIXEL;
  	uint32_t blendcfg, stride;
-	uint32_t x, y, width, height;
+	uint32_t x, y, src_x, src_y, width, height;
  	uint32_t roi_w, roi_h;
  	int lm;
@@ -800,6 +811,26 @@ static void mdp5_crtc_restore_cursor(struct drm_crtc *crtc) get_roi(crtc, &roi_w, &roi_h); + /* If cusror buffer overlaps due to rotation on the
+	 * upper or left screen border the pixel offset inside
+	 * the cursor buffer of the ROI is the positive overlap
+	 * distance.
+	 */
+	if (mdp5_crtc->cursor.x < 0) {
+		src_x = abs(mdp5_crtc->cursor.x);
+		x = 0;
+	} else {
+		src_x = 0;
+	}
+	if (mdp5_crtc->cursor.y < 0) {
+		src_y = abs(mdp5_crtc->cursor.y);
+		y = 0;
+	} else {
+		src_y = 0;
+	}
+	DBG("%s: x=%u, y=%u roi_w=%u roi_h=%u src_x=%u src_y=%u",
+		crtc->name, x, y, roi_w, roi_h, src_x, src_y);
+
  	mdp5_write(mdp5_kms, REG_MDP5_LM_CURSOR_STRIDE(lm), stride);
  	mdp5_write(mdp5_kms, REG_MDP5_LM_CURSOR_FORMAT(lm),
  			MDP5_LM_CURSOR_FORMAT_FORMAT(CURSOR_FMT_ARGB8888));
@@ -812,6 +843,9 @@ static void mdp5_crtc_restore_cursor(struct drm_crtc *crtc)
  	mdp5_write(mdp5_kms, REG_MDP5_LM_CURSOR_START_XY(lm),
  			MDP5_LM_CURSOR_START_XY_Y_START(y) |
  			MDP5_LM_CURSOR_START_XY_X_START(x));
+	mdp5_write(mdp5_kms, REG_MDP5_LM_CURSOR_XY(lm),
+			MDP5_LM_CURSOR_XY_SRC_Y(src_y) |
+			MDP5_LM_CURSOR_XY_SRC_X(src_x));
  	mdp5_write(mdp5_kms, REG_MDP5_LM_CURSOR_BASE_ADDR(lm),
  			mdp5_crtc->cursor.iova);
@@ -932,8 +966,9 @@ static int mdp5_crtc_cursor_move(struct drm_crtc *crtc, int x, int y)
  	if (unlikely(!crtc->state->enable))
  		return 0;
- mdp5_crtc->cursor.x = x = max(x, 0);
-	mdp5_crtc->cursor.y = y = max(y, 0);
+	/* accept negative x/y coordinates up to maximum cursor overlap */
+	mdp5_crtc->cursor.x = x = max(x, -(int)mdp5_crtc->cursor.width);
+	mdp5_crtc->cursor.y = y = max(y, -(int)mdp5_crtc->cursor.height);
get_roi(crtc, &roi_w, &roi_h);
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