drm/tegra: dc: Factor out DC, window and cursor commit

The sequence to commit changes to the DC, window or cursor configuration
is repetitive and can be extracted into separate functions for ease of
use.
Signed-off-by: Thierry Reding <treding@nvidia.com>

drivers/gpu/drm/tegra/dc.c

@@ -36,6 +36,26 @@ static inline struct tegra_plane *to_tegra_plane(struct drm_plane *plane)
 	return container_of(plane, struct tegra_plane, base);
 }
 
+static void tegra_dc_window_commit(struct tegra_dc *dc, unsigned int index)
+{
+	u32 value = WIN_A_ACT_REQ << index;
+
+	tegra_dc_writel(dc, value << 8, DC_CMD_STATE_CONTROL);
+	tegra_dc_writel(dc, value, DC_CMD_STATE_CONTROL);
+}
+
+static void tegra_dc_cursor_commit(struct tegra_dc *dc)
+{
+	tegra_dc_writel(dc, CURSOR_ACT_REQ << 8, DC_CMD_STATE_CONTROL);
+	tegra_dc_writel(dc, CURSOR_ACT_REQ, DC_CMD_STATE_CONTROL);
+}
+
+static void tegra_dc_commit(struct tegra_dc *dc)
+{
+	tegra_dc_writel(dc, GENERAL_ACT_REQ << 8, DC_CMD_STATE_CONTROL);
+	tegra_dc_writel(dc, GENERAL_ACT_REQ, DC_CMD_STATE_CONTROL);
+}
+
 static unsigned int tegra_dc_format(uint32_t format, uint32_t *swap)
 {
 	/* assume no swapping of fetched data */
@@ -307,8 +327,7 @@ static int tegra_dc_setup_window(struct tegra_dc *dc, unsigned int index,
 		break;
 	}
 
-	tegra_dc_writel(dc, WIN_A_UPDATE << index, DC_CMD_STATE_CONTROL);
-	tegra_dc_writel(dc, WIN_A_ACT_REQ << index, DC_CMD_STATE_CONTROL);
+	tegra_dc_window_commit(dc, index);
 
 	return 0;
 }
@@ -379,8 +398,7 @@ static int tegra_plane_disable(struct drm_plane *plane)
 	value &= ~WIN_ENABLE;
 	tegra_dc_writel(dc, value, DC_WIN_WIN_OPTIONS);
 
-	tegra_dc_writel(dc, WIN_A_UPDATE << p->index, DC_CMD_STATE_CONTROL);
-	tegra_dc_writel(dc, WIN_A_ACT_REQ << p->index, DC_CMD_STATE_CONTROL);
+	tegra_dc_window_commit(dc, p->index);
 
 	return 0;
 }
@@ -517,10 +535,8 @@ static int tegra_dc_set_base(struct tegra_dc *dc, int x, int y,
 	tegra_dc_writel(dc, h_offset, DC_WINBUF_ADDR_H_OFFSET);
 	tegra_dc_writel(dc, v_offset, DC_WINBUF_ADDR_V_OFFSET);
 
-	value = GENERAL_UPDATE | WIN_A_UPDATE;
-	tegra_dc_writel(dc, value, DC_CMD_STATE_CONTROL);
-
 	value = GENERAL_ACT_REQ | WIN_A_ACT_REQ;
+	tegra_dc_writel(dc, value << 8, DC_CMD_STATE_CONTROL);
 	tegra_dc_writel(dc, value, DC_CMD_STATE_CONTROL);
 
 	return 0;
@@ -625,11 +641,8 @@ static int tegra_dc_cursor_set2(struct drm_crtc *crtc, struct drm_file *file,
 		tegra_dc_writel(dc, value, DC_DISP_DISP_WIN_OPTIONS);
 	}
 
-	tegra_dc_writel(dc, CURSOR_ACT_REQ << 8, DC_CMD_STATE_CONTROL);
-	tegra_dc_writel(dc, CURSOR_ACT_REQ, DC_CMD_STATE_CONTROL);
-
-	tegra_dc_writel(dc, GENERAL_ACT_REQ << 8, DC_CMD_STATE_CONTROL);
-	tegra_dc_writel(dc, GENERAL_ACT_REQ, DC_CMD_STATE_CONTROL);
+	tegra_dc_cursor_commit(dc);
+	tegra_dc_commit(dc);
 
 	return 0;
 }
@@ -645,12 +658,9 @@ static int tegra_dc_cursor_move(struct drm_crtc *crtc, int x, int y)
 	value = ((y & 0x3fff) << 16) | (x & 0x3fff);
 	tegra_dc_writel(dc, value, DC_DISP_CURSOR_POSITION);
 
-	tegra_dc_writel(dc, CURSOR_ACT_REQ << 8, DC_CMD_STATE_CONTROL);
-	tegra_dc_writel(dc, CURSOR_ACT_REQ, DC_CMD_STATE_CONTROL);
-
+	tegra_dc_cursor_commit(dc);
 	/* XXX: only required on generations earlier than Tegra124? */
-	tegra_dc_writel(dc, GENERAL_ACT_REQ << 8, DC_CMD_STATE_CONTROL);
-	tegra_dc_writel(dc, GENERAL_ACT_REQ, DC_CMD_STATE_CONTROL);
+	tegra_dc_commit(dc);
 
 	return 0;
 }
@@ -939,15 +949,9 @@ static void tegra_crtc_prepare(struct drm_crtc *crtc)
 static void tegra_crtc_commit(struct drm_crtc *crtc)
 {
 	struct tegra_dc *dc = to_tegra_dc(crtc);
-	unsigned long value;
-
-	value = GENERAL_UPDATE | WIN_A_UPDATE;
-	tegra_dc_writel(dc, value, DC_CMD_STATE_CONTROL);
-
-	value = GENERAL_ACT_REQ | WIN_A_ACT_REQ;
-	tegra_dc_writel(dc, value, DC_CMD_STATE_CONTROL);
 
 	drm_vblank_post_modeset(crtc->dev, dc->pipe);
+	tegra_dc_commit(dc);
 }
 
 static void tegra_crtc_load_lut(struct drm_crtc *crtc)