linux-kernel - [PATCH AUTOSEL 4.14 03/28] drm/panel: simple: fix AUO g185han01 horizontal blanking

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Date:   Tue, 24 Sep 2019 12:50:06 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Lucas Stach <l.stach@...gutronix.de>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Sam Ravnborg <sam@...nborg.org>,
        Sasha Levin <sashal@...nel.org>,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 4.14 03/28] drm/panel: simple: fix AUO g185han01 horizontal blanking

From: Lucas Stach <l.stach@...gutronix.de>

[ Upstream commit f8c6bfc612b56f02e1b8fae699dff12738aaf889 ]

The horizontal blanking periods are too short, as the values are
specified for a single LVDS channel. Since this panel is dual LVDS
they need to be doubled. With this change the panel reaches its
nominal vrefresh rate of 60Fps, instead of the 64Fps with the
current wrong blanking.

Philipp Zabel added:
The datasheet specifies 960 active clocks + 40/128/160 clocks blanking
on each of the two LVDS channels (min/typical/max), so doubled this is
now correct.

Signed-off-by: Lucas Stach <l.stach@...gutronix.de>
Reviewed-by: Philipp Zabel <p.zabel@...gutronix.de>
Reviewed-by: Sam Ravnborg <sam@...nborg.org>
Signed-off-by: Sam Ravnborg <sam@...nborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1562764060.23869.12.camel@pengutronix.de
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/panel/panel-simple.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index 7a0fd4e4e78d5..c1daed3fe8428 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -614,9 +614,9 @@ static const struct panel_desc auo_g133han01 = {
 static const struct display_timing auo_g185han01_timings = {
 	.pixelclock = { 120000000, 144000000, 175000000 },
 	.hactive = { 1920, 1920, 1920 },
-	.hfront_porch = { 18, 60, 74 },
-	.hback_porch = { 12, 44, 54 },
-	.hsync_len = { 10, 24, 32 },
+	.hfront_porch = { 36, 120, 148 },
+	.hback_porch = { 24, 88, 108 },
+	.hsync_len = { 20, 48, 64 },
 	.vactive = { 1080, 1080, 1080 },
 	.vfront_porch = { 6, 10, 40 },
 	.vback_porch = { 2, 5, 20 },
-- 
2.20.1