ASoC: fsl_ssi: mark some registers precious
Mark some registers precious since their
reads have side effects (like clearing flags).
Signed-off-by: Maciej S. Szmigiero <mail@maciej.szmigiero.name>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/sound/soc/fsl/fsl_ssi.c b/sound/soc/fsl/fsl_ssi.c
index cc22354..40dfd8a 100644
--- a/sound/soc/fsl/fsl_ssi.c
+++ b/sound/soc/fsl/fsl_ssi.c
@@ -157,6 +157,21 @@
}
}
+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 @@
.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,
};
