linux-kernel - [PATCH-RFC 0/3] mmc: switch to 1-bit mode which stopping clocks.

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Message-ID: <20150127233118.32160.11899.stgit@notabene.brown>
Date:	Wed, 28 Jan 2015 10:35:24 +1100
From:	NeilBrown <neilb@...e.de>
To:	Tony Lindgren <tony@...mide.com>,
	Ulf Hansson <ulf.hansson@...aro.org>
Cc:	GTA04 owners <gta04-owner@...delico.com>,
	linux-omap@...r.kernel.org, linux-mmc@...r.kernel.org,
	linux-kernel@...r.kernel.org, Andreas Fenkart <afenkart@...il.com>
Subject: [PATCH-RFC 0/3] mmc: switch to 1-bit mode which stopping clocks.

An mmc/sdio host which is expecting interrupts from an SDIO card
should not turn off clocks unless the bus is configured to a width
of 1-bit.  In 4-bit mode interrupts may not be generated without
the clock.

This series fixes omap_hsmmc to set 1-bit mode when appropriate
and so allows my wifi chip to work much better.

This is an RFC.  The code seems to work, but I feel it could be
structured better (so that other drivers can share more of it), and
I need to convince myself there is no room for races.

Thanks,
NeilBrown


---

NeilBrown (3):
      mmc: core: allow non-blocking form of mmc_claim_host
      mmc: core: export functions for setting bus width.
      mmc: omap_hsmmc: switch to 1-bit before turning off clocks if interrupts expected.


 drivers/mmc/core/core.c       |    4 ++-
 drivers/mmc/core/sdio.c       |    8 +++---
 drivers/mmc/host/omap_hsmmc.c |   55 ++++++++++++++++++++++++++++++++++++++++-
 include/linux/mmc/host.h      |    4 +++
 4 files changed, 64 insertions(+), 7 deletions(-)

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