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ahci: disable DEVSLP for Intel Valleyview

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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>
This commit is contained in:
Jacob Pan
2014-04-15 22:27:11 -07:00
committed by Tejun Heo
parent 8a4aeec8d2
commit 0cf4a7d6cf
3 changed files with 23 additions and 0 deletions
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drivers/ata/ahci.h
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@@ -236,6 +236,7 @@ enum {
port start (wait until
error-handling stage) */
AHCI_HFLAG_MULTI_MSI = (1 << 16), /* multiple PCI MSIs */
AHCI_HFLAG_NO_DEVSLP = (1 << 17), /* no device sleep */
/* ap->flags bits */