From: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
To: tj@kernel.org, hdegoede@redhat.com
Cc: linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org,
alan.cox@intel.com, Mario.Limonciello@dell.com,
rjw@rjwysocki.net,
Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Subject: [PATCH 1/2] ata: ahci: Support state with min power but Partial low power state
Date: Thu, 19 Jul 2018 17:01:55 -0700 [thread overview]
Message-ID: <20180720000156.77759-2-srinivas.pandruvada@linux.intel.com> (raw)
In-Reply-To: <20180720000156.77759-1-srinivas.pandruvada@linux.intel.com>
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-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
---
drivers/ata/libahci.c | 5 ++++-
drivers/ata/libata-core.c | 1 +
drivers/ata/libata-scsi.c | 1 +
include/linux/libata.h | 3 ++-
4 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index 4c49c7c2a42c..94dcec2a8a5b 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);
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 27d15ed7fa3d..773b5f8eed1e 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -3967,6 +3967,7 @@ int sata_link_scr_lpm(struct ata_link *link, enum ata_lpm_policy policy,
scontrol |= (0x6 << 8);
break;
case ATA_LPM_MED_POWER_WITH_DIPM:
+ case ATA_LPM_MIN_POWER_WITH_PARTIAL:
case ATA_LPM_MIN_POWER:
if (ata_link_nr_enabled(link) > 0)
/* no restrictions on LPM transitions */
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 6a91d04351d9..4648bd5cee15 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -110,6 +110,7 @@ static const char *ata_lpm_policy_names[] = {
[ATA_LPM_MAX_POWER] = "max_performance",
[ATA_LPM_MED_POWER] = "medium_power",
[ATA_LPM_MED_POWER_WITH_DIPM] = "med_power_with_dipm",
+ [ATA_LPM_MIN_POWER_WITH_PARTIAL] = "min_power_with_partial",
[ATA_LPM_MIN_POWER] = "min_power",
};
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 8b8946dd63b9..975543f8c1ff 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -522,7 +522,8 @@ enum ata_lpm_policy {
ATA_LPM_MAX_POWER,
ATA_LPM_MED_POWER,
ATA_LPM_MED_POWER_WITH_DIPM, /* Med power + DIPM as win IRST does */
- ATA_LPM_MIN_POWER,
+ ATA_LPM_MIN_POWER_WITH_PARTIAL, /* Min Power + partial and slumber */
+ ATA_LPM_MIN_POWER, /* Min power + no partial (slumber only) */
};
enum ata_lpm_hints {
--
2.17.1
next prev parent reply other threads:[~2018-07-20 0:02 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-20 0:01 [PATCH 0/2] ata: ahci: Enable DEVSLP by default on SLP_S0 support Srinivas Pandruvada
2018-07-20 0:01 ` Srinivas Pandruvada [this message]
2018-07-20 0:01 ` [PATCH 2/2] ata: ahci: Enable DEVSLP by default on x86 with SLP_S0 Srinivas Pandruvada
2018-07-27 12:36 ` Hans de Goede
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