Commit da73a94f authored by Philippe Schenker's avatar Philippe Schenker Committed by Neil Armstrong
Browse files

drm/bridge: lt8912b: add vsync hsync 



Currently the bridge driver does not take care whether or not the display
needs positive/negative vertical/horizontal syncs. Pass these two flags
to the bridge from the EDID that was read out from the display.

Fixes: 30e2ae94 ("drm/bridge: Introduce LT8912B DSI to HDMI bridge")
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/20220922124306.34729-2-dev@pschenker.ch
parent d8a79c03

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

+8 −1
Original line number Diff line number Diff line
@@ -268,7 +268,7 @@ static int lt8912_video_setup(struct lt8912 *lt) 
	u32 hactive, h_total, hpw, hfp, hbp;

	u32 vactive, v_total, vpw, vfp, vbp;

	u8 settle = 0x08;

	int ret;

	int ret, hsync_activehigh, vsync_activehigh;



	if (!lt)

		return -EINVAL;
@@ -278,12 +278,14 @@ static int lt8912_video_setup(struct lt8912 *lt) 
	hpw = lt->mode.hsync_len;

	hbp = lt->mode.hback_porch;

	h_total = hactive + hfp + hpw + hbp;

	hsync_activehigh = lt->mode.flags & DISPLAY_FLAGS_HSYNC_HIGH;



	vactive = lt->mode.vactive;

	vfp = lt->mode.vfront_porch;

	vpw = lt->mode.vsync_len;

	vbp = lt->mode.vback_porch;

	v_total = vactive + vfp + vpw + vbp;

	vsync_activehigh = lt->mode.flags & DISPLAY_FLAGS_VSYNC_HIGH;



	if (vactive <= 600)

		settle = 0x04;
@@ -317,6 +319,11 @@ static int lt8912_video_setup(struct lt8912 *lt) 
	ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3e, hfp & 0xff);

	ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3f, hfp >> 8);



	ret |= regmap_update_bits(lt->regmap[I2C_MAIN], 0xab, BIT(0),

				  vsync_activehigh ? BIT(0) : 0);

	ret |= regmap_update_bits(lt->regmap[I2C_MAIN], 0xab, BIT(1),

				  hsync_activehigh ? BIT(1) : 0);



	return ret;

}