bits 16:17 in SD_CTL register refer to stripe control. Added an
offset register(AZX_REG_SD_CTL_3B) to have exclusive read/write
of corresponding register byte. This helps to avoid unnecessary
32-bit read/write of SD_CTL whenever only stripe or other bits of
corresponding byte need to be updated. Also HD audio spec defines
SD_CTL as 3 byte register.
SD_CTL_STRIPE_MASK(0x3) can be used for stripe control programming
and when updating AZX_REG_SD_CTL_3B.
Signed-off-by: Sameer Pujar <spujar@xxxxxxxxxx>
Reviewed-by: Mohan Kumar D <mkumard@xxxxxxxxxx>
Reviewed-by: Ravindra Lokhande <rlokhande@xxxxxxxxxx>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
---
include/sound/hda_register.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/include/sound/hda_register.h b/include/sound/hda_register.h
index 2ab39fb..0fd3929 100644
--- a/include/sound/hda_register.h
+++ b/include/sound/hda_register.h
@@ -79,6 +79,7 @@ enum { SDI0, SDI1, SDI2, SDI3, SDO0, SDO1, SDO2, SDO3 };
/* stream register offsets from stream base */
#define AZX_REG_SD_CTL 0x00
+#define AZX_REG_SD_CTL_3B 0x02 /* 3rd byte of SD_CTL register */
#define AZX_REG_SD_STS 0x03
#define AZX_REG_SD_LPIB 0x04
#define AZX_REG_SD_CBL 0x08
@@ -165,6 +166,7 @@ enum { SDI0, SDI1, SDI2, SDI3, SDO0, SDO1, SDO2, SDO3 };
#define SD_INT_COMPLETE 0x04 /* completion interrupt */
#define SD_INT_MASK (SD_INT_DESC_ERR|SD_INT_FIFO_ERR|\
SD_INT_COMPLETE)
+#define SD_CTL_STRIPE_MASK 0x3 /* stripe control mask */
/* SD_STS */
#define SD_STS_FIFO_READY 0x20 /* FIFO ready */
--
2.7.4
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