drm/dsi: Implement DCS set_{column,page}_address commands

Provide small convenience wrappers to set the column and page extents of
the frame memory accessed by the host processors.

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 eb5ed0bcba65548050c5f9d8aa2dcddcb7ce00c7..2f39372e58b61cb737e87ac0cc32f9adf986a8e9 100644 (file)
--- a/drivers/gpu/drm/drm_mipi_dsi.c
+++ b/drivers/gpu/drm/drm_mipi_dsi.c
@@ -728,6 +728,54 @@ int mipi_dsi_dcs_set_display_on(struct mipi_dsi_device *dsi)
 }
 EXPORT_SYMBOL(mipi_dsi_dcs_set_display_on);
 
+/**
+ * mipi_dsi_dcs_set_column_address() - define the column extent of the frame
+ *    memory accessed by the host processor
+ * @dsi: DSI peripheral device
+ * @start: first column of frame memory
+ * @end: last column of frame memory
+ *
+ * Return: 0 on success or a negative error code on failure.
+ */
+int mipi_dsi_dcs_set_column_address(struct mipi_dsi_device *dsi, u16 start,
+                                   u16 end)
+{
+       u8 payload[4] = { start >> 8, start & 0xff, end >> 8, end & 0xff };
+       ssize_t err;
+
+       err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_COLUMN_ADDRESS, payload,
+                                sizeof(payload));
+       if (err < 0)
+               return err;
+
+       return 0;
+}
+EXPORT_SYMBOL(mipi_dsi_dcs_set_column_address);
+
+/**
+ * mipi_dsi_dcs_set_page_address() - define the page extent of the frame
+ *    memory accessed by the host processor
+ * @dsi: DSI peripheral device
+ * @start: first page of frame memory
+ * @end: last page of frame memory
+ *
+ * Return: 0 on success or a negative error code on failure.
+ */
+int mipi_dsi_dcs_set_page_address(struct mipi_dsi_device *dsi, u16 start,
+                                 u16 end)
+{
+       u8 payload[4] = { start >> 8, start & 0xff, end >> 8, end & 0xff };
+       ssize_t err;
+
+       err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_PAGE_ADDRESS, payload,
+                                sizeof(payload));
+       if (err < 0)
+               return err;
+
+       return 0;
+}
+EXPORT_SYMBOL(mipi_dsi_dcs_set_page_address);
+
 /**
  * mipi_dsi_dcs_set_tear_off() - turn off the display module's Tearing Effect
  *    output signal on the TE signal line

diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h
index 79927f2d4b6c0d8e6f26ccae078c6e4addb997ea..061a792daf7d1ddee5266577dadc2668badea6a7 100644 (file)
--- a/include/drm/drm_mipi_dsi.h
+++ b/include/drm/drm_mipi_dsi.h
@@ -205,6 +205,10 @@ int mipi_dsi_dcs_enter_sleep_mode(struct mipi_dsi_device *dsi);
 int mipi_dsi_dcs_exit_sleep_mode(struct mipi_dsi_device *dsi);
 int mipi_dsi_dcs_set_display_off(struct mipi_dsi_device *dsi);
 int mipi_dsi_dcs_set_display_on(struct mipi_dsi_device *dsi);
+int mipi_dsi_dcs_set_column_address(struct mipi_dsi_device *dsi, u16 start,
+                                   u16 end);
+int mipi_dsi_dcs_set_page_address(struct mipi_dsi_device *dsi, u16 start,
+                                 u16 end);
 int mipi_dsi_dcs_set_tear_off(struct mipi_dsi_device *dsi);
 int mipi_dsi_dcs_set_tear_on(struct mipi_dsi_device *dsi,
                             enum mipi_dsi_dcs_tear_mode mode);