linux-kernel - [RFC PATCH v2 0/2] ata: ahci: Enable DEVSLP by default on SLP

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Message-Id: <20180712222712.65310-1-srinivas.pandruvada@linux.intel.com>
Date:   Thu, 12 Jul 2018 15:27:10 -0700
From:   Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To:     tj@...nel.org, hdegoede@...hat.com
Cc:     linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
        alan.cox@...el.com, Mario.Limonciello@...l.com, rjw@...ysocki.net,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Subject: [RFC PATCH v2 0/2] ata: ahci: Enable DEVSLP by default on SLP_S0 support

One of the requirement for modern x86 system to enter lowest power mode
(SLP_S0) is SATA IP block to be off. This is true even during when
platform is suspended to idle and not only in opportunistic (runtime)
suspend.
This series is to enable DEVSLP by default.

v2
- As suggested by Hans, it is possible to have ASP with DEVSLP, so
add a new state.
- Removed usage of mem_sleep_current, instead just rely on low power
idle flag. Don't feel good to EXPORT from core suspend code.
- Depending host policy to decide if we enable DEVSLP by default.

Srinivas (1):
  ata: ahci: Enable DEVSLP by default on x86 with SLP_S0

Srinivas Pandruvada (1):
  ata: ahci: Support state with min power but Partial low power state

 drivers/ata/ahci.c        | 15 +++++++++++++++
 drivers/ata/libahci.c     |  6 +++++-
 drivers/ata/libata-core.c |  1 +
 drivers/ata/libata-scsi.c |  1 +
 include/linux/libata.h    |  3 ++-
 5 files changed, 24 insertions(+), 2 deletions(-)

-- 
2.17.1