linux-kernel - [RFC PATCH v2 0/2] amba/dma: pl330: add Power Management support

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Message-id: <1410533779-3310-1-git-send-email-k.kozlowski@samsung.com>
Date:	Fri, 12 Sep 2014 16:56:17 +0200
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Russell King <linux@....linux.org.uk>,
	Dan Williams <dan.j.williams@...el.com>,
	Vinod Koul <vinod.koul@...el.com>,
	linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Grant Likely <grant.likely@...aro.org>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Michal Simek <michal.simek@...inx.com>
Cc:	Kyungmin Park <kyungmin.park@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>
Subject: [RFC PATCH v2 0/2] amba/dma: pl330: add Power Management support

Hi,


This is second request for comments for adding runtime PM to the pl330
driver.

The runtime PM of pl330 driver requires interrupt safe suspend/resume
callbacks which is in conflict with amba bus driver. The latter
also unprepares and prepares the AMBA bus clock which is not safe
for atomic context.

The patchset solves this in patch 1/2.

Any comments are welcome.


TODO:
=====
 - Document somewhere the suspend/resume callbacks behavior between
   amba bus driver and device driver.

Changes since v1:
=================
1. Add patch 1 (amba: Allow AMBA drivers to use their own runtime PM).
2. Patch 2/2: Apply Michal Simek's suggestions.
3. Patch 2/2: Fix atomic context safeness in pl330_issue_pending().


Best regards,
Krzysztof Kozlowski

Krzysztof Kozlowski (2):
  amba: Allow AMBA drivers to use their own runtime PM
  dma: pl330: add Power Management support

 drivers/amba/bus.c  | 15 +++++++++++-
 drivers/dma/pl330.c | 69 +++++++++++++++++++++++++++++++++++++++++++++++++----
 2 files changed, 79 insertions(+), 5 deletions(-)

-- 
1.9.1

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