drm/tinydrm: Use damage helper for dirtyfb

This switches to drm_atomic_helper_dirtyfb() as the framebuffer dirty
handler. All flushing will now happen in the pipe functions.

Also enable the damage plane property for all except repaper which can
only do full updates.

ili9225:
This change made ili9225_init() equal to mipi_dbi_init() so use it.

v3: Include vblank header (Sam)
    ili9225 and st7586 can't use mipi_dbi_enable_flush() (David)

v2: Remove fb check in mipi_dbi_enable_flush() it can't be NULL
    (kbuild test robot)

Cc: David Lechner <david@lechnology.com>
Cc: Eric Anholt <eric@anholt.net>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Tested-by: David Lechner <david@lechnology.com>
Reviewed-by: David Lechner <david@lechnology.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190115043643.2364-5-noralf@tronnes.org

1 files changed, 52 insertions, 27 deletions

diff --git a/drivers/gpu/drm/tinydrm/mipi-dbi.c b/drivers/gpu/drm/tinydrm/mipi-dbi.c
index 1e7e8cfc99f0..918f77c7de34 100644
--- a/drivers/gpu/drm/tinydrm/mipi-dbi.c
+++ b/drivers/gpu/drm/tinydrm/mipi-dbi.c
@@ -17,15 +17,16 @@
 #include <linux/regulator/consumer.h>
 #include <linux/spi/spi.h>
 
+#include <drm/drm_damage_helper.h>
 #include <drm/drm_drv.h>
 #include <drm/drm_fb_cma_helper.h>
 #include <drm/drm_gem_cma_helper.h>
 #include <drm/drm_fourcc.h>
 #include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_vblank.h>
 #include <drm/drm_rect.h>
 #include <drm/tinydrm/mipi-dbi.h>
 #include <drm/tinydrm/tinydrm-helpers.h>
-#include <uapi/drm/drm.h>
 #include <video/mipi_display.h>
 
 #define MIPI_DBI_MAX_SPI_READ_SPEED 2000000 /* 2MHz */
@@ -212,27 +213,22 @@ int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb,
 }
 EXPORT_SYMBOL(mipi_dbi_buf_copy);
 
-static int mipi_dbi_fb_dirty(struct drm_framebuffer *fb,
-			     struct drm_file *file_priv,
-			     unsigned int flags, unsigned int color,
-			     struct drm_clip_rect *clips,
-			     unsigned int num_clips)
+static void mipi_dbi_fb_dirty(struct drm_framebuffer *fb, struct drm_rect *rect)
 {
 	struct drm_gem_cma_object *cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
 	struct tinydrm_device *tdev = fb->dev->dev_private;
 	struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev);
+	unsigned int height = rect->y2 - rect->y1;
+	unsigned int width = rect->x2 - rect->x1;
 	bool swap = mipi->swap_bytes;
-	struct drm_rect clip;
-	struct drm_rect *rect = &clip;
 	int ret = 0;
 	bool full;
 	void *tr;
 
 	if (!mipi->enabled)
-		return 0;
+		return;
 
-	full = tinydrm_merge_clips(&clip, clips, num_clips, flags,
-				   fb->width, fb->height);
+	full = width == fb->width && height == fb->height;
 
 	DRM_DEBUG_KMS("Flushing [FB:%d] " DRM_RECT_FMT "\n", fb->base.id, DRM_RECT_ARG(rect));
 
@@ -241,7 +237,7 @@ static int mipi_dbi_fb_dirty(struct drm_framebuffer *fb,
 		tr = mipi->tx_buf;
 		ret = mipi_dbi_buf_copy(mipi->tx_buf, fb, rect, swap);
 		if (ret)
-			return ret;
+			goto err_msg;
 	} else {
 		tr = cma_obj->vaddr;
 	}
@@ -254,16 +250,38 @@ static int mipi_dbi_fb_dirty(struct drm_framebuffer *fb,
 			 ((rect->y2 - 1) >> 8) & 0xff, (rect->y2 - 1) & 0xff);
 
 	ret = mipi_dbi_command_buf(mipi, MIPI_DCS_WRITE_MEMORY_START, tr,
-				   (rect->x2 - rect->x1) * (rect->y2 - rect->y1) * 2);
-
-	return ret;
+				   width * height * 2);
+err_msg:
+	if (ret)
+		dev_err_once(fb->dev->dev, "Failed to update display %d\n", ret);
 }
 
-static const struct drm_framebuffer_funcs mipi_dbi_fb_funcs = {
-	.destroy	= drm_gem_fb_destroy,
-	.create_handle	= drm_gem_fb_create_handle,
-	.dirty		= tinydrm_fb_dirty,
-};
+/**
+ * mipi_dbi_pipe_update - Display pipe update helper
+ * @pipe: Simple display pipe
+ * @old_state: Old plane state
+ *
+ * This function handles framebuffer flushing and vblank events. Drivers can use
+ * this as their &drm_simple_display_pipe_funcs->update callback.
+ */
+void mipi_dbi_pipe_update(struct drm_simple_display_pipe *pipe,
+			  struct drm_plane_state *old_state)
+{
+	struct drm_plane_state *state = pipe->plane.state;
+	struct drm_crtc *crtc = &pipe->crtc;
+	struct drm_rect rect;
+
+	if (drm_atomic_helper_damage_merged(old_state, state, &rect))
+		mipi_dbi_fb_dirty(state->fb, &rect);
+
+	if (crtc->state->event) {
+		spin_lock_irq(&crtc->dev->event_lock);
+		drm_crtc_send_vblank_event(crtc, crtc->state->event);
+		spin_unlock_irq(&crtc->dev->event_lock);
+		crtc->state->event = NULL;
+	}
+}
+EXPORT_SYMBOL(mipi_dbi_pipe_update);
 
 /**
  * mipi_dbi_enable_flush - MIPI DBI enable helper
@@ -274,18 +292,25 @@ static const struct drm_framebuffer_funcs mipi_dbi_fb_funcs = {
  * 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.
+ *
+ * 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
+ * flushing code.
  */
 void mipi_dbi_enable_flush(struct mipi_dbi *mipi,
 			   struct drm_crtc_state *crtc_state,
 			   struct drm_plane_state *plane_state)
 {
-	struct tinydrm_device *tdev = &mipi->tinydrm;
 	struct drm_framebuffer *fb = plane_state->fb;
+	struct drm_rect rect = {
+		.x1 = 0,
+		.x2 = fb->width,
+		.y1 = 0,
+		.y2 = fb->height,
+	};
 
 	mipi->enabled = true;
-	if (fb)
-		tdev->fb_dirty(fb, NULL, 0, 0, NULL, 0);
-
+	mipi_dbi_fb_dirty(fb, &rect);
 	backlight_enable(mipi->backlight);
 }
 EXPORT_SYMBOL(mipi_dbi_enable_flush);
@@ -377,12 +402,10 @@ int mipi_dbi_init(struct device *dev, struct mipi_dbi *mipi,
 	if (!mipi->tx_buf)
 		return -ENOMEM;
 
-	ret = devm_tinydrm_init(dev, tdev, &mipi_dbi_fb_funcs, driver);
+	ret = devm_tinydrm_init(dev, tdev, driver);
 	if (ret)
 		return ret;
 
-	tdev->fb_dirty = mipi_dbi_fb_dirty;
-
 	/* TODO: Maybe add DRM_MODE_CONNECTOR_SPI */
 	ret = tinydrm_display_pipe_init(tdev, pipe_funcs,
 					DRM_MODE_CONNECTOR_VIRTUAL,
@@ -392,6 +415,8 @@ int mipi_dbi_init(struct device *dev, struct mipi_dbi *mipi,
 	if (ret)
 		return ret;
 
+	drm_plane_enable_fb_damage_clips(&tdev->pipe.plane);
+
 	tdev->drm->mode_config.preferred_depth = 16;
 	mipi->rotation = rotation;