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Commit e8395081 authored by Vinay Simha BN's avatar Vinay Simha BN Committed by Daniel Vetter
Browse files

drm/dsi: Implement set tear scanline 



Provide a small convenience wrapper that transmits
a set_tear_scanline command.

v2:
  * helper function suggested by Thierry
    for set_tear_scanline
  * Also includes small build fixes from Sumit Semwal.

v3: one scanline parameter suggested by jani

v4: passing the payload properly as suggested by jani

Cc: Archit Taneja <archit.taneja@gmail.com>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Signed-off-by: default avatarVinay Simha BN <simhavcs@gmail.com>
Reviewed-by: default avatarSumit Semwal <sumit.semwal@linaro.org>
Reviewed-by: default avatarJani Nikula <jani.nikula@intel.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1465285532-12676-1-git-send-email-simhavcs@gmail.com
parent ce0c5757

drivers/gpu/drm/drm_mipi_dsi.c

+22 −0
Original line number Diff line number Diff line
@@ -982,6 +982,28 @@ int mipi_dsi_dcs_set_tear_on(struct mipi_dsi_device *dsi, 
}

EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_on);



/**

 * mipi_dsi_set_tear_scanline() - turn on the display module's Tearing Effect

 * output signal on the TE signal line when display module reaches line N

 * defined by STS[n:0].

 * @dsi: DSI peripheral device

 * @param: STS[10:0]

 * Return: 0 on success or a negative error code on failure

 */

int mipi_dsi_set_tear_scanline(struct mipi_dsi_device *dsi, u16 param)

{

	u8 payload[3] = { MIPI_DCS_SET_TEAR_SCANLINE, param >> 8,

			  param & 0xff };

	ssize_t err;



	err = mipi_dsi_generic_write(dsi, payload, sizeof(payload));

	if (err < 0)

		return err;



	return 0;

}

EXPORT_SYMBOL(mipi_dsi_set_tear_scanline);



/**

 * mipi_dsi_dcs_set_pixel_format() - sets the pixel format for the RGB image

 *    data used by the interface

include/drm/drm_mipi_dsi.h

+1 −0
Original line number Diff line number Diff line
@@ -263,6 +263,7 @@ 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_set_tear_scanline(struct mipi_dsi_device *dsi, u16 param);

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);