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Commit 3b46d4a0 authored by Thierry Reding's avatar Thierry Reding
Browse files

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: default avatarSean Paul <seanpaul@chromium.org>
Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
parent 5cc0af16

drivers/gpu/drm/drm_mipi_dsi.c

+48 −0
Original line number Diff line number Diff line
@@ -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

include/drm/drm_mipi_dsi.h

+4 −0
Original line number Diff line number Diff line
@@ -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);