From e8395081636734da19778b0446d65588a06bc40d Mon Sep 17 00:00:00 2001 From: Vinay Simha BN Date: Tue, 7 Jun 2016 13:15:31 +0530 Subject: 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 Cc: John Stultz Cc: Thierry Reding Cc: Sumit Semwal Cc: Jani Nikula Signed-off-by: Vinay Simha BN Reviewed-by: Sumit Semwal Reviewed-by: Jani Nikula Signed-off-by: Daniel Vetter Link: http://patchwork.freedesktop.org/patch/msgid/1465285532-12676-1-git-send-email-simhavcs@gmail.com --- drivers/gpu/drm/drm_mipi_dsi.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) (limited to 'drivers/gpu/drm/drm_mipi_dsi.c') diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c index f5d80839a90c..7938ce7ebed8 100644 --- a/drivers/gpu/drm/drm_mipi_dsi.c +++ b/drivers/gpu/drm/drm_mipi_dsi.c @@ -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 -- cgit