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| author | Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> | 2018-07-27 23:47:02 +0300 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2018-07-30 17:09:10 +0300 |
| commit | a5ec5a7bfd1f28d1905499641c9f589be36808c1 (patch) | |
| tree | 592320d7a604f9ca492a29a293983231bbe19a1b /drivers/ata/libahci.c | |
| parent | 04ba9488199e3ee9971769cee585ec6847013ed2 (diff) | |
| download | linux-a5ec5a7bfd1f28d1905499641c9f589be36808c1.tar.xz | |
ata: ahci: Support state with min power but Partial low power state
Currently when min_power policy is selected, the partial low power state
is not entered and link will try aggressively enter to only slumber state.
Add a new policy which still enable DEVSLP but also try to enter partial
low power state. This policy is presented as "min_power_with_partial".
For information the difference between partial and slumber
Partial – PHY logic is powered up, and in a reduced power state. The link
PM exit latency to active state maximum is 10 ns.
Slumber – PHY logic is powered up, and in a reduced power state. The link
PM exit latency to active state maximum is 10 ms.
Devslp – PHY logic is powered down. The link PM exit latency from this
state to active state maximum is 20 ms, unless otherwise specified by
DETO.
Suggested-and-reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'drivers/ata/libahci.c')
| -rw-r--r-- | drivers/ata/libahci.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c index 5038cee7d982..f79dce613e54 100644 --- a/drivers/ata/libahci.c +++ b/drivers/ata/libahci.c @@ -800,6 +800,8 @@ static int ahci_set_lpm(struct ata_link *link, enum ata_lpm_policy policy, cmd |= PORT_CMD_ALPE; if (policy == ATA_LPM_MIN_POWER) cmd |= PORT_CMD_ASP; + else if (policy == ATA_LPM_MIN_POWER_WITH_PARTIAL) + cmd &= ~PORT_CMD_ASP; /* write out new cmd value */ writel(cmd, port_mmio + PORT_CMD); @@ -810,7 +812,8 @@ static int ahci_set_lpm(struct ata_link *link, enum ata_lpm_policy policy, if ((hpriv->cap2 & HOST_CAP2_SDS) && (hpriv->cap2 & HOST_CAP2_SADM) && (link->device->flags & ATA_DFLAG_DEVSLP)) { - if (policy == ATA_LPM_MIN_POWER) + if (policy == ATA_LPM_MIN_POWER || + policy == ATA_LPM_MIN_POWER_WITH_PARTIAL) ahci_set_aggressive_devslp(ap, true); else ahci_set_aggressive_devslp(ap, false); |