drm/sti: force cursor CLUT fetch

It may happen that the cursor is displayed with wrong colors which can
be explained by a CLUT wrongly fetched at the first display.
Fetching the CLUT at each commit (=move) ensures that the right colors
are used, at least from the first cursor move.
Signed-off-by: Fabien Dessenne <fabien.dessenne@st.com>
Reviewed-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Reviewed-by: Vincent Abriou <vincent.abriou@st.com>

drivers/gpu/drm/sti/sti_cursor.c

@@ -127,7 +127,6 @@ static void sti_cursor_atomic_update(struct drm_plane *drm_plane,
 	/* src_x are in 16.16 format */
 	int src_w = state->src_w >> 16;
 	int src_h = state->src_h >> 16;
-	bool first_prepare = plane->status == STI_PLANE_DISABLED ? true : false;
 	struct drm_gem_cma_object *cma_obj;
 	u32 y, x;
 	u32 val;
@@ -193,12 +192,6 @@ static void sti_cursor_atomic_update(struct drm_plane *drm_plane,
 	val = y << 16 | x;
 	writel(val, cursor->regs + CUR_AWE);
 
-	if (first_prepare) {
-		/* Set and fetch CLUT */
-		writel(cursor->clut_paddr, cursor->regs + CUR_CML);
-		writel(CUR_CTL_CLUT_UPDATE, cursor->regs + CUR_CTL);
-	}
-
 	/* Set memory location, size, and position */
 	writel(cursor->pixmap.paddr, cursor->regs + CUR_PML);
 	writel(cursor->width, cursor->regs + CUR_PMP);
@@ -208,6 +201,10 @@ static void sti_cursor_atomic_update(struct drm_plane *drm_plane,
 	x = sti_vtg_get_pixel_number(*mode, dst_x);
 	writel((y << 16) | x, cursor->regs + CUR_VPO);
 
+	/* Set and fetch CLUT */
+	writel(cursor->clut_paddr, cursor->regs + CUR_CML);
+	writel(CUR_CTL_CLUT_UPDATE, cursor->regs + CUR_CTL);
+
 	plane->status = STI_PLANE_UPDATED;
 }