[PATCH 4.9 067/171] ASoC: rt5677: Mark reg RT5677_PWR_ANLG2 as volatile

From: Greg Kroah-Hartman
Date: Thu Jan 02 2020 - 17:29:37 EST

From: Ben Zhang <benzh@xxxxxxxxxxxx>

[ Upstream commit eabf424f7b60246c76dcb0ea6f1e83ef9abbeaa6 ]

The codec dies when RT5677_PWR_ANLG2(MX-64h) is set to 0xACE1
while it's streaming audio over SPI. The DSP firmware turns
on PLL2 (MX-64 bit 8) when SPI streaming starts. However regmap
does not believe that register can change by itself. When
BST1 (bit 15) is turned on with regmap_update_bits(), it doesn't
read the register first before write, so PLL2 power bit is
cleared by accident.

Marking MX-64h as volatile in regmap solved the issue.

Signed-off-by: Ben Zhang <benzh@xxxxxxxxxxxx>
Signed-off-by: Curtis Malainey <cujomalainey@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20191106011335.223061-6-cujomalainey@xxxxxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
sound/soc/codecs/rt5677.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/sound/soc/codecs/rt5677.c b/sound/soc/codecs/rt5677.c
index 65ac4518ad06..49ab26e69f2f 100644
--- a/sound/soc/codecs/rt5677.c
+++ b/sound/soc/codecs/rt5677.c
@@ -305,6 +305,7 @@ static bool rt5677_volatile_register(struct device *dev, unsigned int reg)
case RT5677_I2C_MASTER_CTRL7:
case RT5677_I2C_MASTER_CTRL8:
case RT5677_HAP_GENE_CTRL2:
+ case RT5677_PWR_ANLG2: /* Modified by DSP firmware */
case RT5677_PWR_DSP_ST:
case RT5677_PRIV_DATA:
case RT5677_ASRC_22: