drm/amdgpu/dce10: Use cursor_set2 hook for enabling / disabling the HW cursor

The cursor_set2 hook provides the cursor hotspot position within the
cursor image. When the hotspot position changes, we can adjust the cursor
position such that the hotspot doesn't move on the screen. This prevents
the cursor from appearing to intermittently jump around on the screen
when the position of the hotspot within the cursor image changes.

Port of radeon commits:
78b1a6010b46a69bcd47b723a80f92693f26d17b
3feba08d79c32777a845c3c8a4ab93092bdf6f19

Reviewed-by: Michel Dänzer <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h

···
 	uint32_t crtc_offset;
 	struct drm_gem_object *cursor_bo;
 	uint64_t cursor_addr;
+	int cursor_x;
+	int cursor_y;
+	int cursor_hot_x;
+	int cursor_hot_y;
 	int cursor_width;
 	int cursor_height;
 	int max_cursor_width;

drivers/gpu/drm/amd/amdgpu/dce_v10_0.c

···
 	WREG32_IDX(mmCUR_CONTROL + amdgpu_crtc->crtc_offset, tmp);
 }
 
-static void dce_v10_0_set_cursor(struct drm_crtc *crtc, struct drm_gem_object *obj,
-			      uint64_t gpu_addr)
-{
-	struct amdgpu_crtc *amdgpu_crtc = to_amdgpu_crtc(crtc);
-	struct amdgpu_device *adev = crtc->dev->dev_private;
-
-	WREG32(mmCUR_SURFACE_ADDRESS_HIGH + amdgpu_crtc->crtc_offset,
-	       upper_32_bits(gpu_addr));
-	WREG32(mmCUR_SURFACE_ADDRESS + amdgpu_crtc->crtc_offset,
-	       lower_32_bits(gpu_addr));
-}
-
-static int dce_v10_0_crtc_cursor_move(struct drm_crtc *crtc,
-				     int x, int y)
+static int dce_v10_0_cursor_move_locked(struct drm_crtc *crtc,
+					int x, int y)
 {
 	struct amdgpu_crtc *amdgpu_crtc = to_amdgpu_crtc(crtc);
 	struct amdgpu_device *adev = crtc->dev->dev_private;
···
 		y = 0;
 	}
 
-	dce_v10_0_lock_cursor(crtc, true);
 	WREG32(mmCUR_POSITION + amdgpu_crtc->crtc_offset, (x << 16) | y);
 	WREG32(mmCUR_HOT_SPOT + amdgpu_crtc->crtc_offset, (xorigin << 16) | yorigin);
 	WREG32(mmCUR_SIZE + amdgpu_crtc->crtc_offset,
 	       ((amdgpu_crtc->cursor_width - 1) << 16) | (amdgpu_crtc->cursor_height - 1));
-	dce_v10_0_lock_cursor(crtc, false);
+
+	amdgpu_crtc->cursor_x = x;
+	amdgpu_crtc->cursor_y = y;
 
 	return 0;
 }
 
-static int dce_v10_0_crtc_cursor_set(struct drm_crtc *crtc,
-				    struct drm_file *file_priv,
-				    uint32_t handle,
-				    uint32_t width,
-				    uint32_t height)
+static void dce_v10_0_set_cursor(struct drm_crtc *crtc, struct drm_gem_object *obj,
+				 uint64_t gpu_addr, int hot_x, int hot_y)
+{
+	struct amdgpu_crtc *amdgpu_crtc = to_amdgpu_crtc(crtc);
+	struct amdgpu_device *adev = crtc->dev->dev_private;
+
+	WREG32(mmCUR_SURFACE_ADDRESS_HIGH + amdgpu_crtc->crtc_offset,
+	       upper_32_bits(gpu_addr));
+	WREG32(mmCUR_SURFACE_ADDRESS + amdgpu_crtc->crtc_offset,
+	       lower_32_bits(gpu_addr));
+
+	if (hot_x != amdgpu_crtc->cursor_hot_x ||
+	    hot_y != amdgpu_crtc->cursor_hot_y) {
+		int x, y;
+
+		x = amdgpu_crtc->cursor_x + amdgpu_crtc->cursor_hot_x - hot_x;
+		y = amdgpu_crtc->cursor_y + amdgpu_crtc->cursor_hot_y - hot_y;
+
+		dce_v10_0_cursor_move_locked(crtc, x, y);
+
+		amdgpu_crtc->cursor_hot_x = hot_x;
+		amdgpu_crtc->cursor_hot_y = hot_y;
+	}
+}
+
+static int dce_v10_0_crtc_cursor_move(struct drm_crtc *crtc,
+				      int x, int y)
+{
+	int ret;
+
+	dce_v10_0_lock_cursor(crtc, true);
+	ret = dce_v10_0_cursor_move_locked(crtc, x, y);
+	dce_v10_0_lock_cursor(crtc, false);
+
+	return ret;
+}
+
+static int dce_v10_0_crtc_cursor_set2(struct drm_crtc *crtc,
+				      struct drm_file *file_priv,
+				      uint32_t handle,
+				      uint32_t width,
+				      uint32_t height,
+				      int32_t hot_x,
+				      int32_t hot_y)
 {
 	struct amdgpu_crtc *amdgpu_crtc = to_amdgpu_crtc(crtc);
 	struct drm_gem_object *obj;
···
 	amdgpu_crtc->cursor_height = height;
 
 	dce_v10_0_lock_cursor(crtc, true);
-	dce_v10_0_set_cursor(crtc, obj, gpu_addr);
+	dce_v10_0_set_cursor(crtc, obj, gpu_addr, hot_x, hot_y);
 	dce_v10_0_show_cursor(crtc);
 	dce_v10_0_lock_cursor(crtc, false);
 
···
 }
 
 static const struct drm_crtc_funcs dce_v10_0_crtc_funcs = {
-	.cursor_set = dce_v10_0_crtc_cursor_set,
+	.cursor_set2 = dce_v10_0_crtc_cursor_set2,
 	.cursor_move = dce_v10_0_crtc_cursor_move,
 	.gamma_set = dce_v10_0_crtc_gamma_set,
 	.set_config = amdgpu_crtc_set_config,