linux-kernel - [PATCH 4.9 28/58] drm/bridge: tc358767: fix output H/V syncs

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Date:   Mon, 18 Feb 2019 14:43:49 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Tomi Valkeinen <tomi.valkeinen@...com>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 28/58] drm/bridge: tc358767: fix output H/V syncs

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit 7923e09c7a766e2d58de7fc395bb84c18e5bc625 ]

The H and V syncs of the DP output are always set to active high. This
patch fixes the syncs by configuring them according to the videomode.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...com>
Reviewed-by: Andrzej Hajda <a.hajda@...sung.com>
Signed-off-by: Andrzej Hajda <a.hajda@...sung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190103115954.12785-7-tomi.valkeinen@ti.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/bridge/tc358767.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
index 16fa42984c50..fa3f2f039a74 100644
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -96,6 +96,8 @@
 #define DP0_STARTVAL		0x064c
 #define DP0_ACTIVEVAL		0x0650
 #define DP0_SYNCVAL		0x0654
+#define SYNCVAL_HS_POL_ACTIVE_LOW	(1 << 15)
+#define SYNCVAL_VS_POL_ACTIVE_LOW	(1 << 31)
 #define DP0_MISC		0x0658
 #define TU_SIZE_RECOMMENDED		(63) /* LSCLK cycles per TU */
 #define BPC_6				(0 << 5)
@@ -724,7 +726,9 @@ static int tc_set_video_mode(struct tc_data *tc, struct drm_display_mode *mode)
 
 	tc_write(DP0_ACTIVEVAL, (mode->vdisplay << 16) | (mode->hdisplay));
 
-	tc_write(DP0_SYNCVAL, (vsync_len << 16) | (hsync_len << 0));
+	tc_write(DP0_SYNCVAL, (vsync_len << 16) | (hsync_len << 0) |
+		 ((mode->flags & DRM_MODE_FLAG_NHSYNC) ? SYNCVAL_HS_POL_ACTIVE_LOW : 0) |
+		 ((mode->flags & DRM_MODE_FLAG_NVSYNC) ? SYNCVAL_VS_POL_ACTIVE_LOW : 0));
 
 	tc_write(DPIPXLFMT, VS_POL_ACTIVE_LOW | HS_POL_ACTIVE_LOW |
 		 DE_POL_ACTIVE_HIGH | SUB_CFG_TYPE_CONFIG1 | DPI_BPP_RGB888);
-- 
2.19.1