From 3b46d4a0def157e77000e252bf5caae7d3defe1b Mon Sep 17 00:00:00 2001 From: Thierry Reding Date: Tue, 5 Aug 2014 11:20:25 +0200 Subject: 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 Signed-off-by: Thierry Reding --- drivers/gpu/drm/drm_mipi_dsi.c | 48 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) (limited to 'drivers/gpu/drm') 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 @@ -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 -- cgit v1.2.3