Mark a display as in use when display_enable() is called. This can avoid
a display being used by multiple video-output devices.
Signed-off-by: Simon Glass <s...@chromium.org>
---
Changes in v2: None
drivers/video/display-uclass.c | 18 +++++++++++++++++-
include/display.h | 10 ++++++++++
2 files changed, 27 insertions(+), 1 deletion(-)
diff --git a/drivers/video/display-uclass.c b/drivers/video/display-uclass.c
index e4763de..e752eb0 100644
--- a/drivers/video/display-uclass.c
+++ b/drivers/video/display-uclass.c
@@ -23,10 +23,19 @@ int display_enable(struct udevice *dev, int panel_bpp,
const struct display_timing *timing)
{
struct dm_display_ops *ops = display_get_ops(dev);
+ struct display_plat *disp_uc_plat;
+ int ret;
if (!ops || !ops->enable)
return -ENOSYS;
- return ops->enable(dev, panel_bpp, timing);
+ ret = ops->enable(dev, panel_bpp, timing);
+ if (ret)
+ return ret;
+
+ disp_uc_plat = dev_get_uclass_platdata(dev);
+ disp_uc_plat->in_use = true;
+
+ return 0;
}
int display_read_timing(struct udevice *dev, struct display_timing *timing)
@@ -48,6 +57,13 @@ int display_read_timing(struct udevice *dev, struct
display_timing *timing)
return edid_get_timing(buf, ret, timing, &panel_bits_per_colour);
}
+bool display_in_use(struct udevice *dev)
+{
+ struct display_plat *disp_uc_plat = dev_get_uclass_platdata(dev);
+
+ return disp_uc_plat->in_use;
+}
+
UCLASS_DRIVER(display) = {
.id = UCLASS_DISPLAY,
.name = "display",
diff --git a/include/display.h b/include/display.h
index b1c4766..d0a08d4 100644
--- a/include/display.h
+++ b/include/display.h
@@ -16,10 +16,12 @@ struct display_timing;
* @source_id: ID for the source of the display data, typically a video
* controller
* @src_dev: Source device providing the video
+ * @in_use: Display is being used
*/
struct display_plat {
int source_id;
struct udevice *src_dev;
+ bool in_use;
};
/**
@@ -41,6 +43,14 @@ int display_read_timing(struct udevice *dev, struct
display_timing *timing);
int display_enable(struct udevice *dev, int panel_bpp,
const struct display_timing *timing);
+/**
+ * display_in_use() - Check if a display is in use by any device
+ *
+ * @return true if the device is in use (display_enable() has been called
+ * successfully), else false
+ */
+bool display_in_use(struct udevice *dev);
+
struct dm_display_ops {
/**
* read_timing() - Read information directly
--
2.8.0.rc3.226.g39d4020
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