Merge tag 'drm-for-v4.8' of git://people.freedesktop.org/~airlied/linux

[cascardo/linux.git] / drivers / gpu / drm / drm_mipi_dsi.c

diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c
index f5d8083..af0d471 100644 (file)
--- a/drivers/gpu/drm/drm_mipi_dsi.c
+++ b/drivers/gpu/drm/drm_mipi_dsi.c
@@ -60,6 +60,21 @@ static int mipi_dsi_device_match(struct device *dev, struct device_driver *drv)
        return 0;
 }
 
+static int mipi_dsi_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+       struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
+       int err;
+
+       err = of_device_uevent_modalias(dev, env);
+       if (err != -ENODEV)
+               return err;
+
+       add_uevent_var(env, "MODALIAS=%s%s", MIPI_DSI_MODULE_PREFIX,
+                      dsi->name);
+
+       return 0;
+}
+
 static const struct dev_pm_ops mipi_dsi_device_pm_ops = {
        .runtime_suspend = pm_generic_runtime_suspend,
        .runtime_resume = pm_generic_runtime_resume,
@@ -74,6 +89,7 @@ static const struct dev_pm_ops mipi_dsi_device_pm_ops = {
 static struct bus_type mipi_dsi_bus_type = {
        .name = "mipi-dsi",
        .match = mipi_dsi_device_match,
+       .uevent = mipi_dsi_uevent,
        .pm = &mipi_dsi_device_pm_ops,
 };
 
@@ -982,6 +998,28 @@ int mipi_dsi_dcs_set_tear_on(struct mipi_dsi_device *dsi,
 }
 EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_on);
 
+/**
+ * mipi_dsi_dcs_set_tear_scanline() - set the scanline to use as trigger for
+ *    the Tearing Effect output signal of the display module
+ * @dsi: DSI peripheral device
+ * @scanline: scanline to use as trigger
+ *
+ * Return: 0 on success or a negative error code on failure
+ */
+int mipi_dsi_dcs_set_tear_scanline(struct mipi_dsi_device *dsi, u16 scanline)
+{
+       u8 payload[3] = { MIPI_DCS_SET_TEAR_SCANLINE, scanline >> 8,
+                         scanline & 0xff };
+       ssize_t err;
+
+       err = mipi_dsi_generic_write(dsi, payload, sizeof(payload));
+       if (err < 0)
+               return err;
+
+       return 0;
+}
+EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_scanline);
+
 /**
  * mipi_dsi_dcs_set_pixel_format() - sets the pixel format for the RGB image
  *    data used by the interface