drm/mipi-dbi: Remove ->enabled

The atomic helpers try really hard to not lose track of things,
duplicating enabled tracking in the driver is at best confusing.
Double-enabling or disabling is a bug in atomic helpers.

In the fb_dirty function we can just assume that the fb always exists,
simple display pipe helpers guarantee that the crtc is only enabled
together with the output, so we always have a primary plane around.

Now in the update function we need to be a notch more careful, since
that can also get called when the crtc is off. And we don't want to
upload frames when that's the case, so filter that out too.

Reviewed-by: Noralf Trønnes <noralf@tronnes.org>
Acked-by: David Lechner <david@lechnology.com>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: David Lechner <david@lechnology.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200612160056.2082681-7-daniel.vetter@ffwll.ch

drivers/gpu/drm/drm_mipi_dbi.c

@@ -268,7 +268,7 @@ static void mipi_dbi_fb_dirty(struct drm_framebuffer *fb, struct drm_rect *rect)
 	bool full;
 	void *tr;
 
-	if (!dbidev->enabled)
+	if (WARN_ON(!fb))
 		return;
 
 	if (!drm_dev_enter(fb->dev, &idx))
@@ -314,6 +314,9 @@ void mipi_dbi_pipe_update(struct drm_simple_display_pipe *pipe,
 	struct drm_plane_state *state = pipe->plane.state;
 	struct drm_rect rect;
 
+	if (!pipe->crtc.state->active)
+		return;
+
 	if (drm_atomic_helper_damage_merged(old_state, state, &rect))
 		mipi_dbi_fb_dirty(state->fb, &rect);
 }
@@ -325,9 +328,8 @@ EXPORT_SYMBOL(mipi_dbi_pipe_update);
  * @crtc_state: CRTC state
  * @plane_state: Plane state
  *
- * 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.
+ * Flushes the whole framebuffer and enables the backlight. Drivers can use this
+ * in their &drm_simple_display_pipe_funcs->enable callback.
  *
  * Note: Drivers which don't use mipi_dbi_pipe_update() because they have custom
  * framebuffer flushing, can't use this function since they both use the same
@@ -349,7 +351,6 @@ void mipi_dbi_enable_flush(struct mipi_dbi_dev *dbidev,
 	if (!drm_dev_enter(&dbidev->drm, &idx))
 		return;
 
-	dbidev->enabled = true;
 	mipi_dbi_fb_dirty(fb, &rect);
 	backlight_enable(dbidev->backlight);
 
@@ -390,13 +391,8 @@ void mipi_dbi_pipe_disable(struct drm_simple_display_pipe *pipe)
 {
 	struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev);
 
-	if (!dbidev->enabled)
-		return;
-
 	DRM_DEBUG_KMS("\n");
 
-	dbidev->enabled = false;
-
 	if (dbidev->backlight)
 		backlight_disable(dbidev->backlight);
 	else

drivers/gpu/drm/tiny/ili9225.c

@@ -89,9 +89,6 @@ static void ili9225_fb_dirty(struct drm_framebuffer *fb, struct drm_rect *rect)
 	bool full;
 	void *tr;
 
-	if (!dbidev->enabled)
-		return;
-
 	if (!drm_dev_enter(fb->dev, &idx))
 		return;
 
@@ -167,6 +164,9 @@ static void ili9225_pipe_update(struct drm_simple_display_pipe *pipe,
 	struct drm_plane_state *state = pipe->plane.state;
 	struct drm_rect rect;
 
+	if (!pipe->crtc.state->active)
+		return;
+
 	if (drm_atomic_helper_damage_merged(old_state, state, &rect))
 		ili9225_fb_dirty(state->fb, &rect);
 }
@@ -275,7 +275,6 @@ static void ili9225_pipe_enable(struct drm_simple_display_pipe *pipe,
 
 	ili9225_command(dbi, ILI9225_DISPLAY_CONTROL_1, 0x1017);
 
-	dbidev->enabled = true;
 	ili9225_fb_dirty(fb, &rect);
 out_exit:
 	drm_dev_exit(idx);
@@ -295,16 +294,11 @@ static void ili9225_pipe_disable(struct drm_simple_display_pipe *pipe)
 	 * unplug.
 	 */
 
-	if (!dbidev->enabled)
-		return;
-
 	ili9225_command(dbi, ILI9225_DISPLAY_CONTROL_1, 0x0000);
 	msleep(50);
 	ili9225_command(dbi, ILI9225_POWER_CONTROL_2, 0x0007);
 	msleep(50);
 	ili9225_command(dbi, ILI9225_POWER_CONTROL_1, 0x0a02);
-
-	dbidev->enabled = false;
 }
 
 static int ili9225_dbi_command(struct mipi_dbi *dbi, u8 *cmd, u8 *par,

drivers/gpu/drm/tiny/st7586.c

@@ -118,9 +118,6 @@ static void st7586_fb_dirty(struct drm_framebuffer *fb, struct drm_rect *rect)
 	struct mipi_dbi *dbi = &dbidev->dbi;
 	int start, end, idx, ret = 0;
 
-	if (!dbidev->enabled)
-		return;
-
 	if (!drm_dev_enter(fb->dev, &idx))
 		return;
 
@@ -161,6 +158,9 @@ static void st7586_pipe_update(struct drm_simple_display_pipe *pipe,
 	struct drm_plane_state *state = pipe->plane.state;
 	struct drm_rect rect;
 
+	if (!pipe->crtc.state->active)
+		return;
+
 	if (drm_atomic_helper_damage_merged(old_state, state, &rect))
 		st7586_fb_dirty(state->fb, &rect);
 }
@@ -237,7 +237,6 @@ static void st7586_pipe_enable(struct drm_simple_display_pipe *pipe,
 
 	msleep(100);
 
-	dbidev->enabled = true;
 	st7586_fb_dirty(fb, &rect);
 
 	mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
@@ -258,11 +257,7 @@ static void st7586_pipe_disable(struct drm_simple_display_pipe *pipe)
 
 	DRM_DEBUG_KMS("\n");
 
-	if (!dbidev->enabled)
-		return;
-
 	mipi_dbi_command(&dbidev->dbi, MIPI_DCS_SET_DISPLAY_OFF);
-	dbidev->enabled = false;
 }
 
 static const u32 st7586_formats[] = {

include/drm/drm_mipi_dbi.h

@@ -94,11 +94,6 @@ struct mipi_dbi_dev {
 	 */
 	struct drm_display_mode mode;
 
-	/**
-	 * @enabled: Pipeline is enabled
-	 */
-	bool enabled;
-
 	/**
 	 * @tx_buf: Buffer used for transfer (copy clip rect area)
 	 */