[PATCH 04/10] drm/client: Add drm_client_framebuffer_flush()

[Noralf Trønnes]

Some drivers need explicit flushing of buffer changes, add a function
that does that.

Signed-off-by: Noralf Trønnes <noralf at tronnes.org>
---
 drivers/gpu/drm/drm_client.c | 31 +++++++++++++++++++++++++++++++
 include/drm/drm_client.h     |  1 +
 2 files changed, 32 insertions(+)

diff --git a/drivers/gpu/drm/drm_client.c b/drivers/gpu/drm/drm_client.c
index cb5ee9f1ffaa..8dbc2ecdcaea 100644
--- a/drivers/gpu/drm/drm_client.c
+++ b/drivers/gpu/drm/drm_client.c
@@ -483,6 +483,37 @@ void drm_client_framebuffer_delete(struct drm_client_buffer *buffer)
 }
 EXPORT_SYMBOL(drm_client_framebuffer_delete);
 
+/**
+ * drm_client_framebuffer_flush - Manually flush client framebuffer
+ * @buffer: DRM client buffer (can be NULL)
+ * @rect: Damage rectangle (if NULL flushes all)
+ *
+ * This calls &drm_framebuffer_funcs->dirty (if present) to flush buffer changes
+ * for drivers that need it.
+ *
+ * Returns:
+ * Zero on success or negative error code on failure.
+ */
+int drm_client_framebuffer_flush(struct drm_client_buffer *buffer, struct drm_rect *rect)
+{
+	struct drm_clip_rect clip_rect, *clip = NULL;
+
+	if (!buffer || !buffer->fb || !buffer->fb->funcs->dirty)
+		return 0;
+
+	if (rect) {
+		clip = &clip_rect;
+		clip->x1 = rect->x1;
+		clip->y1 = rect->y1;
+		clip->x2 = rect->x2;
+		clip->y2 = rect->y2;
+	}
+
+	return buffer->fb->funcs->dirty(buffer->fb, buffer->client->file,
+					0, 0, clip, clip ? 1 : 0);
+}
+EXPORT_SYMBOL(drm_client_framebuffer_flush);
+
 #ifdef CONFIG_DEBUG_FS
 static int drm_client_debugfs_internal_clients(struct seq_file *m, void *data)
 {
diff --git a/include/drm/drm_client.h b/include/drm/drm_client.h
index bbb5689fa9a8..6ef5364d6dfb 100644
--- a/include/drm/drm_client.h
+++ b/include/drm/drm_client.h
@@ -156,6 +156,7 @@ struct drm_client_buffer {
 struct drm_client_buffer *
 drm_client_framebuffer_create(struct drm_client_dev *client, u32 width, u32 height, u32 format);
 void drm_client_framebuffer_delete(struct drm_client_buffer *buffer);
+int drm_client_framebuffer_flush(struct drm_client_buffer *buffer, struct drm_rect *rect);
 void *drm_client_buffer_vmap(struct drm_client_buffer *buffer);
 void drm_client_buffer_vunmap(struct drm_client_buffer *buffer);
 
-- 
2.23.0