Commit 051ad278 authored by Francesco Dolcini's avatar Francesco Dolcini Committed by Neil Armstrong
Browse files

drm/bridge: lt8912b: fix corrupted image output 

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: 30e2ae94 ("drm/bridge: Introduce LT8912B DSI to HDMI bridge")
Signed-off-by: default avatarFrancesco Dolcini <francesco.dolcini@toradex.com>
Signed-off-by: default avatarPhilippe Schenker <philippe.schenker@toradex.com>
Acked-by: default avatarAdrien Grassein <adrien.grassein@gmail.com>
Signed-off-by: default avatarNeil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220922124306.34729-4-dev@pschenker.ch
parent 6dd1de12

drivers/gpu/drm/bridge/lontium-lt8912b.c

+1 −1
Original line number Diff line number Diff line
@@ -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)