drm/tinydrm/mi0283qt: Let the display pipe handle power

It's better to leave power handling and controller init to the
modesetting machinery using the simple pipe .enable and .disable
callbacks. Remove unused mipi_dbi_pipe_enable().
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Reviewed-by: David Lechner <david@lechnology.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180110185940.53841-6-noralf@tronnes.org

drivers/gpu/drm/tinydrm/mi0283qt.c

@@ -47,8 +47,11 @@
 #define ILI9341_MADCTL_MX	BIT(6)
 #define ILI9341_MADCTL_MY	BIT(7)
 
-static int mi0283qt_init(struct mipi_dbi *mipi)
+static void mi0283qt_enable(struct drm_simple_display_pipe *pipe,
+			    struct drm_crtc_state *crtc_state)
 {
+	struct tinydrm_device *tdev = pipe_to_tinydrm(pipe);
+	struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev);
 	u8 addr_mode;
 	int ret;
 
@@ -56,9 +59,9 @@ static int mi0283qt_init(struct mipi_dbi *mipi)
 
 	ret = mipi_dbi_poweron_conditional_reset(mipi);
 	if (ret < 0)
-		return ret;
+		return;
 	if (ret == 1)
-		return 0;
+		goto out_enable;
 
 	mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_OFF);
 
@@ -121,19 +124,12 @@ static int mi0283qt_init(struct mipi_dbi *mipi)
 	mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_ON);
 	msleep(100);
 
-	return 0;
-}
-
-static void mi0283qt_fini(void *data)
-{
-	struct mipi_dbi *mipi = data;
-
-	DRM_DEBUG_KMS("\n");
-	regulator_disable(mipi->regulator);
+out_enable:
+	mipi_dbi_enable_flush(mipi);
 }
 
 static const struct drm_simple_display_pipe_funcs mi0283qt_pipe_funcs = {
-	.enable = mipi_dbi_pipe_enable,
+	.enable = mi0283qt_enable,
 	.disable = mipi_dbi_pipe_disable,
 	.update = tinydrm_display_pipe_update,
 	.prepare_fb = tinydrm_display_pipe_prepare_fb,
@@ -214,17 +210,6 @@ static int mi0283qt_probe(struct spi_device *spi)
 	if (ret)
 		return ret;
 
-	ret = mi0283qt_init(mipi);
-	if (ret)
-		return ret;
-
-	/* use devres to fini after drm unregister (drv->remove is before) */
-	ret = devm_add_action(dev, mi0283qt_fini, mipi);
-	if (ret) {
-		mi0283qt_fini(mipi);
-		return ret;
-	}
-
 	spi_set_drvdata(spi, mipi);
 
 	return devm_tinydrm_register(&mipi->tinydrm);
@@ -240,25 +225,13 @@ static void mi0283qt_shutdown(struct spi_device *spi)
 static int __maybe_unused mi0283qt_pm_suspend(struct device *dev)
 {
 	struct mipi_dbi *mipi = dev_get_drvdata(dev);
-	int ret;
-
-	ret = drm_mode_config_helper_suspend(mipi->tinydrm.drm);
-	if (ret)
-		return ret;
 
-	mi0283qt_fini(mipi);
-
-	return 0;
+	return drm_mode_config_helper_suspend(mipi->tinydrm.drm);
 }
 
 static int __maybe_unused mi0283qt_pm_resume(struct device *dev)
 {
 	struct mipi_dbi *mipi = dev_get_drvdata(dev);
-	int ret;
-
-	ret = mi0283qt_init(mipi);
-	if (ret)
-		return ret;
 
 	drm_mode_config_helper_resume(mipi->tinydrm.drm);
 

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

@@ -290,31 +290,6 @@ void mipi_dbi_enable_flush(struct mipi_dbi *mipi)
 }
 EXPORT_SYMBOL(mipi_dbi_enable_flush);
 
-/**
- * mipi_dbi_pipe_enable - MIPI DBI pipe enable helper
- * @pipe: Display pipe
- * @crtc_state: CRTC state
- *
- * This function enables backlight. Drivers can use this as their
- * &drm_simple_display_pipe_funcs->enable callback.
- */
-void mipi_dbi_pipe_enable(struct drm_simple_display_pipe *pipe,
-			  struct drm_crtc_state *crtc_state)
-{
-	struct tinydrm_device *tdev = pipe_to_tinydrm(pipe);
-	struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev);
-	struct drm_framebuffer *fb = pipe->plane.fb;
-
-	DRM_DEBUG_KMS("\n");
-
-	mipi->enabled = true;
-	if (fb)
-		fb->funcs->dirty(fb, NULL, 0, 0, NULL, 0);
-
-	tinydrm_enable_backlight(mipi->backlight);
-}
-EXPORT_SYMBOL(mipi_dbi_pipe_enable);
-
 static void mipi_dbi_blank(struct mipi_dbi *mipi)
 {
 	struct drm_device *drm = mipi->tinydrm.drm;
@@ -336,8 +311,8 @@ static void mipi_dbi_blank(struct mipi_dbi *mipi)
  * mipi_dbi_pipe_disable - MIPI DBI pipe disable helper
  * @pipe: Display pipe
  *
- * This function disables backlight if present or if not the
- * display memory is blanked. Drivers can use this as their
+ * This function disables backlight if present, if not the display memory is
+ * blanked. The regulator is disabled if in use. Drivers can use this as their
  * &drm_simple_display_pipe_funcs->disable callback.
  */
 void mipi_dbi_pipe_disable(struct drm_simple_display_pipe *pipe)
@@ -353,6 +328,9 @@ void mipi_dbi_pipe_disable(struct drm_simple_display_pipe *pipe)
 		tinydrm_disable_backlight(mipi->backlight);
 	else
 		mipi_dbi_blank(mipi);
+
+	if (mipi->regulator)
+		regulator_disable(mipi->regulator);
 }
 EXPORT_SYMBOL(mipi_dbi_pipe_disable);
 

include/drm/tinydrm/mipi-dbi.h

@@ -68,8 +68,6 @@ int mipi_dbi_init(struct device *dev, struct mipi_dbi *mipi,
 		  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);
 void mipi_dbi_hw_reset(struct mipi_dbi *mipi);
 bool mipi_dbi_display_is_on(struct mipi_dbi *mipi);