From 7fab72f85d862572ed3281860dc550b7e737ac52 Mon Sep 17 00:00:00 2001 From: Doug Berger Date: Wed, 21 Jun 2017 16:20:13 -0700 Subject: libata: Add the AHCI_HFLAG_NO_WRITE_TO_RO flag While most hardware will simply ignore a write to a read-only register, some hardware will signal an abort if this occurs. This commit introduces the flag AHCI_HFLAG_NO_WRITE_TO_RO to prevent the AHCI library from attempting to write to the HOST_CAP, HOST_CAP2, and HOST_PORTS_IMPL registers which may be read-only. Signed-off-by: Doug Berger Signed-off-by: Tejun Heo --- drivers/ata/ahci.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'drivers/ata/ahci.h') diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h index ee176e4af97a..8b61123d2c3c 100644 --- a/drivers/ata/ahci.h +++ b/drivers/ata/ahci.h @@ -249,6 +249,8 @@ enum { #endif AHCI_HFLAG_WAKE_BEFORE_STOP = (1 << 22), /* wake before DMA stop */ AHCI_HFLAG_YES_ALPM = (1 << 23), /* force ALPM cap on */ + AHCI_HFLAG_NO_WRITE_TO_RO = (1 << 24), /* don't write to read + only registers */ /* ap->flags bits */ -- cgit v1.2.3