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| author | Doug Berger <opendmb@gmail.com> | 2017-06-21 16:20:12 -0700 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2017-06-22 16:12:59 -0400 |
| commit | ef0da1bf767d9e557c6375c7066717eead54cb15 (patch) | |
| tree | b14505fb37293098d814f455272c77b7ecff9aa8 /drivers/ata | |
| parent | d0318fb3c388a4082a4ea2b94fc242cd5c064cea (diff) | |
| download | linux-stable-ef0da1bf767d9e557c6375c7066717eead54cb15.tar.gz linux-stable-ef0da1bf767d9e557c6375c7066717eead54cb15.tar.bz2 linux-stable-ef0da1bf767d9e557c6375c7066717eead54cb15.zip | |
libata: Add the AHCI_HFLAG_YES_ALPM flag
Some hardware is capable of supporting Aggresive Link Power Management
even though it is not indicated by the Host Capability register.
This commit adds the AHCI_HFLAG_YES_ALPM flag to the AHCI library to
allow indication of this quirk when the Host Capability register is
Read Only and therefore cannot be changed.
Signed-off-by: Doug Berger <opendmb@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'drivers/ata')
| -rw-r--r-- | drivers/ata/ahci.h | 1 | ||||
| -rw-r--r-- | drivers/ata/libahci.c | 5 |
2 files changed, 6 insertions, 0 deletions
diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h index 30f67a1a4f54..ee176e4af97a 100644 --- a/drivers/ata/ahci.h +++ b/drivers/ata/ahci.h @@ -248,6 +248,7 @@ enum { AHCI_HFLAG_MULTI_MSI = 0, #endif AHCI_HFLAG_WAKE_BEFORE_STOP = (1 << 22), /* wake before DMA stop */ + AHCI_HFLAG_YES_ALPM = (1 << 23), /* force ALPM cap on */ /* ap->flags bits */ diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c index b3a685ad9b87..4462f8a8cf2c 100644 --- a/drivers/ata/libahci.c +++ b/drivers/ata/libahci.c @@ -504,6 +504,11 @@ void ahci_save_initial_config(struct device *dev, struct ahci_host_priv *hpriv) cap &= ~HOST_CAP_FBS; } + if (!(cap & HOST_CAP_ALPM) && (hpriv->flags & AHCI_HFLAG_YES_ALPM)) { + dev_info(dev, "controller can do ALPM, turning on CAP_ALPM\n"); + cap |= HOST_CAP_ALPM; + } + if (hpriv->force_port_map && port_map != hpriv->force_port_map) { dev_info(dev, "forcing port_map 0x%x -> 0x%x\n", port_map, hpriv->force_port_map); |