drm/tinydrm/mipi-dbi: Add mipi_dbi_enable_flush()

Add and use a function for enabling, flushing and turning on backlight.
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Reviewed-by: David Lechner <david@lechnology.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180110185940.53841-4-noralf@tronnes.org

drivers/gpu/drm/tinydrm/ili9225.c

@@ -180,7 +180,6 @@ static void ili9225_pipe_enable(struct drm_simple_display_pipe *pipe,
 {
 	struct tinydrm_device *tdev = pipe_to_tinydrm(pipe);
 	struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev);
-	struct drm_framebuffer *fb = pipe->plane.fb;
 	struct device *dev = tdev->drm->dev;
 	int ret;
 	u8 am_id;
@@ -269,10 +268,7 @@ static void ili9225_pipe_enable(struct drm_simple_display_pipe *pipe,
 
 	ili9225_command(mipi, ILI9225_DISPLAY_CONTROL_1, 0x1017);
 
-	mipi->enabled = true;
-
-	if (fb)
-		fb->funcs->dirty(fb, NULL, 0, 0, NULL, 0);
+	mipi_dbi_enable_flush(mipi);
 }
 
 static void ili9225_pipe_disable(struct drm_simple_display_pipe *pipe)

drivers/gpu/drm/tinydrm/mipi-dbi.c

@@ -270,6 +270,26 @@ static const struct drm_framebuffer_funcs mipi_dbi_fb_funcs = {
 	.dirty		= mipi_dbi_fb_dirty,
 };
 
+/**
+ * mipi_dbi_enable_flush - MIPI DBI enable helper
+ * @mipi: MIPI DBI structure
+ *
+ * This function sets &mipi_dbi->enabled, flushes the whole framebuffer and
+ * enables the backlight. Drivers can use this in their
+ * &drm_simple_display_pipe_funcs->enable callback.
+ */
+void mipi_dbi_enable_flush(struct mipi_dbi *mipi)
+{
+	struct drm_framebuffer *fb = mipi->tinydrm.pipe.plane.fb;
+
+	mipi->enabled = true;
+	if (fb)
+		fb->funcs->dirty(fb, NULL, 0, 0, NULL, 0);
+
+	tinydrm_enable_backlight(mipi->backlight);
+}
+EXPORT_SYMBOL(mipi_dbi_enable_flush);
+
 /**
  * mipi_dbi_pipe_enable - MIPI DBI pipe enable helper
  * @pipe: Display pipe

drivers/gpu/drm/tinydrm/st7586.c

@@ -179,7 +179,6 @@ static void st7586_pipe_enable(struct drm_simple_display_pipe *pipe,
 {
 	struct tinydrm_device *tdev = pipe_to_tinydrm(pipe);
 	struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev);
-	struct drm_framebuffer *fb = pipe->plane.fb;
 	struct device *dev = tdev->drm->dev;
 	int ret;
 	u8 addr_mode;
@@ -241,10 +240,7 @@ static void st7586_pipe_enable(struct drm_simple_display_pipe *pipe,
 
 	mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_ON);
 
-	mipi->enabled = true;
-
-	if (fb)
-		fb->funcs->dirty(fb, NULL, 0, 0, NULL, 0);
+	mipi_dbi_enable_flush(mipi);
 }
 
 static void st7586_pipe_disable(struct drm_simple_display_pipe *pipe)

drivers/gpu/drm/tinydrm/st7735r.c

@@ -102,7 +102,7 @@ static void jd_t18003_t01_pipe_enable(struct drm_simple_display_pipe *pipe,
 
 	msleep(20);
 
-	mipi_dbi_pipe_enable(pipe, crtc_state);
+	mipi_dbi_enable_flush(mipi);
 }
 
 static const struct drm_simple_display_pipe_funcs jd_t18003_t01_pipe_funcs = {

include/drm/tinydrm/mipi-dbi.h

@@ -67,6 +67,7 @@ int mipi_dbi_init(struct device *dev, struct mipi_dbi *mipi,
 		  const struct drm_simple_display_pipe_funcs *pipe_funcs,
 		  struct drm_driver *driver,
 		  const struct drm_display_mode *mode, unsigned int rotation);
+void mipi_dbi_enable_flush(struct mipi_dbi *mipi);
 void mipi_dbi_pipe_enable(struct drm_simple_display_pipe *pipe,
 			  struct drm_crtc_state *crtc_state);
 void mipi_dbi_pipe_disable(struct drm_simple_display_pipe *pipe);