[PATCH 2/3] ASoC: fsl_ssi: mark some registers precious
From: Maciej S. Szmigiero <hidden>
Date: 2015-12-20 20:32:05
Mark some registers precious since their reads have side effects (like clearing flags). Signed-off-by: Maciej S. Szmigiero <redacted> --- sound/soc/fsl/fsl_ssi.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+)
diff --git a/sound/soc/fsl/fsl_ssi.c b/sound/soc/fsl/fsl_ssi.c
index cc22354d7758..40dfd8a36484 100644
--- a/sound/soc/fsl/fsl_ssi.c
+++ b/sound/soc/fsl/fsl_ssi.c@@ -157,6 +157,21 @@ static bool fsl_ssi_volatile_reg(struct device *dev, unsigned int reg) } } +static bool fsl_ssi_precious_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case CCSR_SSI_SRX0: + case CCSR_SSI_SRX1: + case CCSR_SSI_SISR: + case CCSR_SSI_SACADD: + case CCSR_SSI_SACDAT: + case CCSR_SSI_SATAG: + return true; + default: + return false; + } +} + static bool fsl_ssi_writeable_reg(struct device *dev, unsigned int reg) { switch (reg) {
@@ -179,6 +194,7 @@ static const struct regmap_config fsl_ssi_regconfig = { .num_reg_defaults = ARRAY_SIZE(fsl_ssi_reg_defaults), .readable_reg = fsl_ssi_readable_reg, .volatile_reg = fsl_ssi_volatile_reg, + .precious_reg = fsl_ssi_precious_reg, .writeable_reg = fsl_ssi_writeable_reg, .cache_type = REGCACHE_RBTREE, };