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-rw-r--r--include/linux/ata.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/ata.h b/include/linux/ata.h
index c494e1c0531e..3671af869696 100644
--- a/include/linux/ata.h
+++ b/include/linux/ata.h
@@ -181,6 +181,9 @@ enum {
XFER_PIO_0 = 0x08,
XFER_PIO_SLOW = 0x00,
+ SETFEATURES_WC_ON = 0x02, /* Enable write cache */
+ SETFEATURES_WC_OFF = 0x82, /* Disable write cache */
+
/* ATAPI stuff */
ATAPI_PKT_DMA = (1 << 0),
ATAPI_DMADIR = (1 << 2), /* ATAPI data dir: