linux-kernel - [PATCH v7 0/3] mmc: dw_mmc: fixes for suspend/resume on exynos

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Date:	Thu, 29 Aug 2013 09:39:07 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	Chris Ball <cjb@...top.org>
Cc:	Jaehoon Chung <jh80.chung@...sung.com>,
	Seungwon Jeon <tgih.jun@...sung.com>,
	James Hogan <james.hogan@...tec.com>,
	Grant Grundler <grundler@...omium.org>,
	Alim Akhtar <alim.akhtar@...sung.com>,
	Abhilash Kesavan <a.kesavan@...sung.com>,
	Tomasz Figa <tomasz.figa@...il.com>,
	Olof Johansson <olof@...om.net>,
	Doug Anderson <dianders@...omium.org>,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mmc@...r.kernel.org, Kukjin Kim <kgene.kim@...sung.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v7 0/3] mmc: dw_mmc: fixes for suspend/resume on exynos

This series of patches addresses some suspend/resume problems with
dw_mmc on exynos platforms, espeically exynos5420.  This patchset was
tested on the current ToT Chromeos 3.8 tree (which has lots of
backports from 3.10/3.11) and on ToT Linux (v3.11-rc6).  I have
confirmed basic booting and that SD cards work across suspend/resume
(both if they are plugged in and if they are not plugged in).

I have received confirmation from Samsung that the problem solved for
exynos5420 is a silicon errata and that this is a good fix.

Changes in v7:
- Avoid printing the same clock over and over again w/ MMC_CLKGATE.

Changes in v6:
- Took out TODO comment copied from main platform code.
- Replaces previous pathes that ensured saving/restoring clocks.

Changes in v5:
- Cleaned up dw_mci_exynos_resume_noirq() comment as per Seungwon.
- Don't memcpy dev_pm_ops structure, define a new one.

Changes in v4:
- Take Seungwon's suggestion and don't add any dw_mmc-pltfm code.

Changes in v3:
- Add freeze/thaw and poweroff/restore noirq entries.

Changes in v2:
- Use suspend_noirq as per James Hogan.

Doug Anderson (3):
  mmc: dw_mmc: Add exynos resume_noirq callback to clear WAKEUP_INT
  mmc: dw_mmc: Honor requests to set the clock to 0 (turn off clock)
  mmc: dw_mmc: Set timeout to max upon resume

 drivers/mmc/host/dw_mmc-exynos.c | 53 +++++++++++++++++++++++++++++++++++++++-
 drivers/mmc/host/dw_mmc.c        | 39 ++++++++++++++++++-----------
 2 files changed, 77 insertions(+), 15 deletions(-)

-- 
1.8.4

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