From: Philippe Schenker <philippe.schenker@xxxxxxxxxxx>
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: 30e2ae943c26 ("drm/bridge: Introduce LT8912B DSI to HDMI bridge")
Signed-off-by: Philippe Schenker <philippe.schenker@xxxxxxxxxxx>
---
drivers/gpu/drm/bridge/lontium-lt8912b.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/bridge/lontium-lt8912b.c b/drivers/gpu/drm/bridge/lontium-lt8912b.c
index 28bad30dc4e5..0fd3472e767c 100644
--- a/drivers/gpu/drm/bridge/lontium-lt8912b.c
+++ b/drivers/gpu/drm/bridge/lontium-lt8912b.c
@@ -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;
}
--
2.37.3
