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| author | Doug Berger <opendmb@gmail.com> | 2017-06-21 16:20:13 -0700 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2017-06-22 16:12:59 -0400 |
| commit | 7fab72f85d862572ed3281860dc550b7e737ac52 (patch) | |
| tree | d45443b96ebe96e3b633b822cae8acb02be9e77a /drivers/ata/libahci.c | |
| parent | ef0da1bf767d9e557c6375c7066717eead54cb15 (diff) | |
| download | linux-rpi-7fab72f85d862572ed3281860dc550b7e737ac52.tar.gz linux-rpi-7fab72f85d862572ed3281860dc550b7e737ac52.tar.bz2 linux-rpi-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/libahci.c')
| -rw-r--r-- | drivers/ata/libahci.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c index 4462f8a8cf2c..3e286d86ab42 100644 --- a/drivers/ata/libahci.c +++ b/drivers/ata/libahci.c @@ -945,7 +945,8 @@ int ahci_reset_controller(struct ata_host *host) /* Some registers might be cleared on reset. Restore * initial values. */ - ahci_restore_initial_config(host); + if (!(hpriv->flags & AHCI_HFLAG_NO_WRITE_TO_RO)) + ahci_restore_initial_config(host); } else dev_info(host->dev, "skipping global host reset\n"); |