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-rw-r--r--include/sound/cs4271.h15
1 files changed, 15 insertions, 0 deletions
diff --git a/include/sound/cs4271.h b/include/sound/cs4271.h
index dd8c48d..70f4535 100644
--- a/include/sound/cs4271.h
+++ b/include/sound/cs4271.h
@@ -20,6 +20,21 @@
struct cs4271_platform_data {
int gpio_nreset; /* GPIO driving Reset pin, if any */
bool amutec_eq_bmutec; /* flag to enable AMUTEC=BMUTEC */
+
+ /*
+ * The CS4271 requires its LRCLK and MCLK to be stable before its RESET
+ * line is de-asserted. That also means that clocks cannot be changed
+ * without putting the chip back into hardware reset, which also requires
+ * a complete re-initialization of all registers.
+ *
+ * One (undocumented) workaround is to assert and de-assert the PDN bit
+ * in the MODE2 register. This workaround can be enabled with the
+ * following flag.
+ *
+ * Note that this is not needed in case the clocks are stable
+ * throughout the entire runtime of the codec.
+ */
+ bool enable_soft_reset;
};
#endif /* __CS4271_H */
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