From: Thierry Reding treding@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@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);