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authorThierry Reding <treding@nvidia.com>2014-08-05 13:20:25 +0400
committerThierry Reding <treding@nvidia.com>2014-11-13 15:56:10 +0300
commit3b46d4a0def157e77000e252bf5caae7d3defe1b (patch)
treeac24dade46621c6dc0b9adeb65fef358fd7b0e34 /drivers/gpu/drm/drm_mipi_dsi.c
parent5cc0af16fc08cfb749fd0635e5e9187c31826827 (diff)
downloadlinux-3b46d4a0def157e77000e252bf5caae7d3defe1b.tar.xz
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>
Diffstat (limited to 'drivers/gpu/drm/drm_mipi_dsi.c')
-rw-r--r--drivers/gpu/drm/drm_mipi_dsi.c48
1 files changed, 48 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c
index eb5ed0bcba65..2f39372e58b6 100644
--- a/drivers/gpu/drm/drm_mipi_dsi.c
+++ b/drivers/gpu/drm/drm_mipi_dsi.c
@@ -729,6 +729,54 @@ 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
* @dsi: DSI peripheral device