From: Thierry Reding <tred...@nvidia.com>
Provide small convenience wrappers to set the column and page extents of
the frame memory accessed by the host processors.
Signed-off-by: Thierry Reding <treding at nvidia.com>
---
drivers/gpu/drm/drm_mipi_dsi.c | 46 ++++++++++++++++++++++++++++++++++++++++++
include/drm/drm_mipi_dsi.h | 4 ++++
2 files changed, 50 insertions(+)
diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c
index d7ca57f1fdd3..d4d3cf752be7 100644
--- a/drivers/gpu/drm/drm_mipi_dsi.c
+++ b/drivers/gpu/drm/drm_mipi_dsi.c
@@ -671,6 +671,52 @@ 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;
+}
+
+/**
+ * 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;
+}
+
+/**
* mipi_dsi_dcs_set_tear_off() - turn off the display module's Tearing Effect
* output signal on the TE signal line
* @dsi: DSI peripheral device
diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h
index 968085b1ef73..17ef2fbb09a5 100644
--- a/include/drm/drm_mipi_dsi.h
+++ b/include/drm/drm_mipi_dsi.h
@@ -184,6 +184,10 @@ 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);
--
2.1.2
