linux-kernel - Re: [PATCH 1/3] amba: add no_pm_pclk_management flag to amba

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Message-ID: <20150416134158.GZ12732@n2100.arm.linux.org.uk>
Date:	Thu, 16 Apr 2015 14:41:58 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Robert Baldyga <r.baldyga@...sung.com>
Cc:	dan.j.williams@...el.com, vinod.koul@...el.com, lars@...afoo.de,
	dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
	m.szyprowski@...sung.com
Subject: Re: [PATCH 1/3] amba: add no_pm_pclk_management flag to amba_driver

On Thu, Apr 16, 2015 at 03:39:12PM +0200, Robert Baldyga wrote:
> This patch introduces no_pm_pclk_management flag in struct amba_driver.
> It causes that pclk is not touched in pm_runtime callbacks. This allows
> to manage clock in device driver independently of power domain management.

NAK.  We already have stuff in place to deal with the problem with
DMA engine using runtime PM, which causes pclk management to fall
back to the IRQ-safe clk_enable/clk_disable().

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