drm/dsi: Implement DCS get_power_mode command
Provide a small convenience wrapper that transmits a DCS get_power_mode
command. A set of bitmasks for the mode bits is also provided.
Acked-by: Andrzej Hajda <a.hajda@samsung.com>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>
diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c
index b3c28fe..80d9301 100644
--- a/drivers/gpu/drm/drm_mipi_dsi.c
+++ b/drivers/gpu/drm/drm_mipi_dsi.c
@@ -603,6 +603,31 @@
EXPORT_SYMBOL(mipi_dsi_dcs_soft_reset);
/**
+ * mipi_dsi_dcs_get_power_mode() - query the display module's current power
+ * mode
+ * @dsi: DSI peripheral device
+ * @mode: return location for the current power mode
+ *
+ * Return: 0 on success or a negative error code on failure.
+ */
+int mipi_dsi_dcs_get_power_mode(struct mipi_dsi_device *dsi, u8 *mode)
+{
+ ssize_t err;
+
+ err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_POWER_MODE, mode,
+ sizeof(*mode));
+ if (err <= 0) {
+ if (err == 0)
+ err = -ENODATA;
+
+ return err;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(mipi_dsi_dcs_get_power_mode);
+
+/**
* mipi_dsi_dcs_enter_sleep_mode() - disable all unnecessary blocks inside the
* display module except interface communication
* @dsi: DSI peripheral device