[RESEND] drm/i2c: tda998x: Reset the I2S_FORMAT (Page0, Reg 0xfc) to it's default

[Peter Ujfalusi]

Hi,

the original version was sent 14.04.2018:
https://patchwork.kernel.org/patch/10344403/

Changes since then:
- rebased on currentl drm/next

The reset value of the register is 0, the soft reset does not reset this
register and if other kernel changed this the audio is going to be
distorted.

It was observed when - accidentally - booted the kernel from eMMC on BBB
which is 3.8.13-bone79 and it sets this register to 0x0a. After reboot and
tda998x_reset() it remains 0x0a.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi at ti.com>
---
 drivers/gpu/drm/i2c/tda998x_drv.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c
index 7f34601bb515..72f93802d209 100644
--- a/drivers/gpu/drm/i2c/tda998x_drv.c
+++ b/drivers/gpu/drm/i2c/tda998x_drv.c
@@ -722,6 +722,9 @@ tda998x_reset(struct tda998x_priv *priv)
 
 	/* Write the default value MUX register */
 	reg_write(priv, REG_MUX_VP_VIP_OUT, 0x24);
+
+	/* Write the default to I2S_FORMAT register */
+	reg_write(priv, REG_I2S_FORMAT,   0x00);
 }
 
 /*
-- 
Peter

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