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authorSrinivas Pandruvada <srinivas.pandruvada@linux.intel.com>2018-07-27 23:47:02 +0300
committerTejun Heo <tj@kernel.org>2018-07-30 17:09:10 +0300
commita5ec5a7bfd1f28d1905499641c9f589be36808c1 (patch)
tree592320d7a604f9ca492a29a293983231bbe19a1b /drivers/ata/libahci.c
parent04ba9488199e3ee9971769cee585ec6847013ed2 (diff)
downloadlinux-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.c5
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);