As the default low power policy applies to more chipsets and drives, it's
important to make sure that drives actually support the policy that a user
selected in their kernel configuration.
If the drive doesn't support slumber, don't let the default policy for the
ATA port be `min_power` or `min_power_with_partial`.
Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx>
---
drivers/ata/ahci.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 17d757ad7111..af8999453084 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -1584,8 +1584,16 @@ static int ahci_init_msi(struct pci_dev *pdev, unsigned int n_ports,
static void ahci_update_initial_lpm_policy(struct ata_port *ap,
struct ahci_host_priv *hpriv)
{
+ struct pci_dev *pdev = to_pci_dev(ap->host->dev);
int policy = CONFIG_SATA_LPM_POLICY;
+ if (policy >= ATA_LPM_MIN_POWER_WITH_PARTIAL &&
+ !(hpriv->cap & HOST_CAP_SSC)) {
+ dev_warn(&pdev->dev,
+ "This drive doesn't support slumber; ignoring default SATA policy\n");
+ return;
+ }
+
/* user modified policy via module param */
if (mobile_lpm_policy != -1) {
policy = mobile_lpm_policy;
--
2.34.1
