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libata: Add the AHCI_HFLAG_YES_ALPM flag

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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>
This commit is contained in:
Doug Berger 2017-06-21 16:20:12 -07:00 committed by Tejun Heo
parent d0318fb3c3
commit ef0da1bf76
2 changed files with 6 additions and 0 deletions
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1
drivers/ata/ahci.h
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@ -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 */

5
drivers/ata/libahci.c
View file

@ -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);