From 051ad2788d35ca07aec8402542e5d38429f2426a Mon Sep 17 00:00:00 2001
From: Francesco Dolcini <francesco.dolcini@toradex.com>
Date: Thu, 22 Sep 2022 14:43:05 +0200
Subject: [PATCH] drm/bridge: lt8912b: fix corrupted image output
Git-commit: 051ad2788d35ca07aec8402542e5d38429f2426a
Patch-mainline: v6.0
References: git-fixes
Alt-commit: 2ab69739209c843a47af82c0620036b233c83688
Correct I2C address for the register list in lt8912_write_lvds_config(),
these registers are on the first I2C address (0x48), the current
function is just writing garbage to the wrong registers and this creates
multiple issues (artifacts and output completely corrupted) on some HDMI
displays.
Correct I2C address comes from Lontium documentation and it is the one
used on other out-of-tree LT8912B drivers [1].
[1] https://github.com/boundarydevices/linux/blob/boundary-imx_5.10.x_2.0.0/drivers/video/lt8912.c#L296
Fixes: 30e2ae943c26 ("drm/bridge: Introduce LT8912B DSI to HDMI bridge")
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Signed-off-by: Philippe Schenker <philippe.schenker@toradex.com>
Acked-by: Adrien Grassein <adrien.grassein@gmail.com>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220922124306.34729-4-dev@pschenker.ch
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/gpu/drm/bridge/lontium-lt8912b.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/bridge/lontium-lt8912b.c b/drivers/gpu/drm/bridge/lontium-lt8912b.c
index 6a4bb7422176..5968f4af190b 100644
--- a/drivers/gpu/drm/bridge/lontium-lt8912b.c
+++ b/drivers/gpu/drm/bridge/lontium-lt8912b.c
@@ -188,7 +188,7 @@ static int lt8912_write_lvds_config(struct lt8912 *lt)
{0x03, 0xff},
};
- return regmap_multi_reg_write(lt->regmap[I2C_CEC_DSI], seq, ARRAY_SIZE(seq));
+ return regmap_multi_reg_write(lt->regmap[I2C_MAIN], seq, ARRAY_SIZE(seq));
};
static inline struct lt8912 *bridge_to_lt8912(struct drm_bridge *b)
--
2.35.3