[PATCH V2] drm: adv7511: Fix low refresh rate register for ADV7533/5

[Alexandru Ardelean]

From: Bogdan Togorean <bogdan.togorean@xxxxxxxxxx>

For ADV7533 and ADV7535 low refresh rate is selected using
bits [3:2] of 0x4a main register.
So depending on ADV model write 0xfb or 0x4a register.

Fixes: 2437e7cd88e8 ("drm/bridge: adv7533: Initial support for ADV7533")
Reviewed-by: Nuno Sa <nuno.sa@xxxxxxxxxx>
Signed-off-by: Bogdan Togorean <bogdan.togorean@xxxxxxxxxx>
---

Changelog v1 -> v2:
* https://lore.kernel.org/dri-devel/20190716131005.761-1-bogdan.togorean@xxxxxxxxxx/
* added Fixes: tag
* added Reviewed-by: tag for Nuno

 drivers/gpu/drm/bridge/adv7511/adv7511_drv.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
index ddceafa7b637..09290a377957 100644
--- a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
+++ b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
@@ -786,8 +786,13 @@ static void adv7511_mode_set(struct adv7511 *adv7511,
 	else
 		low_refresh_rate = ADV7511_LOW_REFRESH_RATE_NONE;
 
-	regmap_update_bits(adv7511->regmap, 0xfb,
-		0x6, low_refresh_rate << 1);
+	if (adv7511->type == ADV7511)
+		regmap_update_bits(adv7511->regmap, 0xfb,
+			0x6, low_refresh_rate << 1);
+	else
+		regmap_update_bits(adv7511->regmap, 0x4a,
+			0xc, low_refresh_rate << 2);
+
 	regmap_update_bits(adv7511->regmap, 0x17,
 		0x60, (vsync_polarity << 6) | (hsync_polarity << 5));
 
-- 
2.41.0