libata: Add the AHCI_HFLAG_YES_ALPM flag (ef0da1bf) · Commits · 戴 / test

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>

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);

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