@@ -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 */
@@ -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);
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> --- drivers/ata/ahci.h | 1 + drivers/ata/libahci.c | 5 +++++ 2 files changed, 6 insertions(+)