[PATCH 4.19 067/168] drm/mipi: use dcs write for mipi_dsi_dcs_set_tear_scanline

[Greg Kroah-Hartman]

From: Emil Velikov <emil.velikov@xxxxxxxxxxxxx>

[ Upstream commit 7a05c3b6d24b8460b3cec436cf1d33fac43c8450 ]

The helper uses the MIPI_DCS_SET_TEAR_SCANLINE, although it's currently
using the generic write. This does not look right.

Perhaps some platforms don't distinguish between the two writers?

Cc: Robert Chiras <robert.chiras@xxxxxxx>
Cc: Vinay Simha BN <simhavcs@xxxxxxxxx>
Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
Cc: Thierry Reding <treding@xxxxxxxxxx>
Fixes: e83950816367 ("drm/dsi: Implement set tear scanline")
Signed-off-by: Emil Velikov <emil.velikov@xxxxxxxxxxxxx>
Reviewed-by: Thierry Reding <treding@xxxxxxxxxx>
Signed-off-by: Sam Ravnborg <sam@xxxxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20200505160329.2976059-3-emil.l.velikov@xxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/gpu/drm/drm_mipi_dsi.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c
index 80b75501f5c6a..7ed8e510565ec 100644
--- a/drivers/gpu/drm/drm_mipi_dsi.c
+++ b/drivers/gpu/drm/drm_mipi_dsi.c
@@ -1034,11 +1034,11 @@ EXPORT_SYMBOL(mipi_dsi_dcs_set_pixel_format);
  */
 int mipi_dsi_dcs_set_tear_scanline(struct mipi_dsi_device *dsi, u16 scanline)
 {
-	u8 payload[3] = { MIPI_DCS_SET_TEAR_SCANLINE, scanline >> 8,
-			  scanline & 0xff };
+	u8 payload[2] = { scanline >> 8, scanline & 0xff };
 	ssize_t err;
 
-	err = mipi_dsi_generic_write(dsi, payload, sizeof(payload));
+	err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_TEAR_SCANLINE, payload,
+				 sizeof(payload));
 	if (err < 0)
 		return err;
 
-- 
2.25.1