Commit ef0da1bf authored by Doug Berger's avatar Doug Berger Committed by Tejun Heo
Browse files

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: default avatarDoug Berger <opendmb@gmail.com>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent d0318fb3

drivers/ata/ahci.h

+1 −0
Original line number Diff line number Diff line
@@ -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 */

drivers/ata/libahci.c

+5 −0
Original line number Diff line number Diff line
@@ -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);