[alsa-devel] [PATCH 3/5] ALSA: hda: add register offset for stripe control

[Sameer Pujar]

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.

Signed-off-by: Sameer Pujar <spujar at nvidia.com>
Reviewed-by: Mohan Kumar D <mkumard at nvidia.com>
Reviewed-by: Ravindra Lokhande <rlokhande at nvidia.com>
---
 include/sound/hda_register.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/sound/hda_register.h b/include/sound/hda_register.h
index 2ab39fb..5b1f5d8 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
-- 
2.7.4


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