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| author | Doug Berger <opendmb@gmail.com> | 2017-06-22 01:20:13 +0200 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2017-06-22 22:12:59 +0200 |
| commit | 7fab72f85d862572ed3281860dc550b7e737ac52 (patch) | |
| tree | d45443b96ebe96e3b633b822cae8acb02be9e77a /drivers/ata/ahci.h | |
| parent | libata: Add the AHCI_HFLAG_YES_ALPM flag (diff) | |
| download | linux-7fab72f85d862572ed3281860dc550b7e737ac52.tar.xz linux-7fab72f85d862572ed3281860dc550b7e737ac52.zip | |
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 <opendmb@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'drivers/ata/ahci.h')
| -rw-r--r-- | drivers/ata/ahci.h | 2 |
1 files changed, 2 insertions, 0 deletions
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 */ |