summaryrefslogtreecommitdiff
path: root/drivers/ata/libahci.c
diff options
context:
space:
mode:
authorDoug Berger <opendmb@gmail.com>2017-06-22 02:20:12 +0300
committerTejun Heo <tj@kernel.org>2017-06-22 23:12:59 +0300
commitef0da1bf767d9e557c6375c7066717eead54cb15 (patch)
treeb14505fb37293098d814f455272c77b7ecff9aa8 /drivers/ata/libahci.c
parentd0318fb3c388a4082a4ea2b94fc242cd5c064cea (diff)
downloadlinux-ef0da1bf767d9e557c6375c7066717eead54cb15.tar.xz
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/libahci.c')
-rw-r--r--drivers/ata/libahci.c5
1 files changed, 5 insertions, 0 deletions
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);