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authorJacob Pan <jacob.jun.pan@linux.intel.com>2014-04-15 22:27:11 -0700
committerTejun Heo <tj@kernel.org>2014-04-24 10:26:26 -0400
commit0cf4a7d6cf23715276fcd0f1cd1cabc6a9b46942 (patch)
tree5fe2093fe6dca045f7c068fb5f39548b6b419b4f /drivers/ata/ahci.c
parent8a4aeec8d2d6a3edeffbdfae451cdf05cbf0fefd (diff)
downloadlinux-0cf4a7d6cf23715276fcd0f1cd1cabc6a9b46942.tar.bz2
ahci: disable DEVSLP for Intel Valleyview
On Intel Valleyview SoC, SATA device sleep is not reliable. When DEVSLP is attempted on certain SSDs, port_devslp write would fail and result in malfunction of AHCI controller. AHCI controller may be not shown in PCI enumeration after reset. Complete power source removal may be required to recover from this failure. So we blacklist this device and override host device reported capabilities such that device LPM will only attempt slumber but not DEVSLP. Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com> Acked-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'drivers/ata/ahci.c')
-rw-r--r--drivers/ata/ahci.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 71e15b73513d..60707814a84b 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -1115,6 +1115,17 @@ static bool ahci_broken_online(struct pci_dev *pdev)
return pdev->bus->number == (val >> 8) && pdev->devfn == (val & 0xff);
}
+static bool ahci_broken_devslp(struct pci_dev *pdev)
+{
+ /* device with broken DEVSLP but still showing SDS capability */
+ static const struct pci_device_id ids[] = {
+ { PCI_VDEVICE(INTEL, 0x0f23)}, /* Valleyview SoC */
+ {}
+ };
+
+ return pci_match_id(ids, pdev);
+}
+
#ifdef CONFIG_ATA_ACPI
static void ahci_gtf_filter_workaround(struct ata_host *host)
{
@@ -1364,6 +1375,10 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
hpriv->mmio = pcim_iomap_table(pdev)[ahci_pci_bar];
+ /* must set flag prior to save config in order to take effect */
+ if (ahci_broken_devslp(pdev))
+ hpriv->flags |= AHCI_HFLAG_NO_DEVSLP;
+
/* save initial config */
ahci_pci_save_initial_config(pdev, hpriv);