linux-kernel - [PATCH] drm: adv7511: Fix low refresh rate register for ADV7533/5

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Message-Id: <20230516164416.11616-1-alex@shruggie.ro>
Date:   Tue, 16 May 2023 19:44:16 +0300
From:   Alexandru Ardelean <alex@...uggie.ro>
To:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc:     airlied@...il.com, daniel@...ll.ch,
        Bogdan Togorean <bogdan.togorean@...log.com>,
        Alexandru Ardelean <alex@...uggie.ro>
Subject: [PATCH] drm: adv7511: Fix low refresh rate register for ADV7533/5

From: Bogdan Togorean <bogdan.togorean@...log.com>

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.

Signed-off-by: Bogdan Togorean <bogdan.togorean@...log.com>
Signed-off-by: Alexandru Ardelean <alex@...uggie.ro>
---
 drivers/gpu/drm/i2c/adv7511.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i2c/adv7511.c b/drivers/gpu/drm/i2c/adv7511.c
index 61aa824d45d2..e016105a8fbe 100644
--- a/drivers/gpu/drm/i2c/adv7511.c
+++ b/drivers/gpu/drm/i2c/adv7511.c
@@ -729,8 +729,13 @@ static void adv7511_encoder_mode_set(struct drm_encoder *encoder,
 	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));
 
-- 
2.40.1