From: Vinod Koul <vinod.koul@intel.com>
To: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>,
Len Brown <len.brown@intel.com>, Pavel Machek <pavel@ucw.cz>,
Russell King <linux@arm.linux.org.uk>,
Dan Williams <dan.j.williams@intel.com>,
Ulf Hansson <ulf.hansson@linaro.org>,
Alan Stern <stern@rowland.harvard.edu>,
linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org,
dmaengine@vger.kernel.org, Lars-Peter Clausen <lars@metafoo.de>,
Michal Simek <michal.simek@xilinx.com>,
Kevin Hilman <khilman@kernel.org>,
Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
Kyungmin Park <kyungmin.park@samsung.com>,
Marek Szyprowski <m.szyprowski@samsung.com>,
Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Subject: Re: [PATCH v10 4/5] dmaengine: pl330: add Power Management support
Date: Thu, 6 Nov 2014 18:15:12 +0530 [thread overview]
Message-ID: <20141106124512.GA1870@intel.com> (raw)
In-Reply-To: <1415263010-7992-5-git-send-email-k.kozlowski@samsung.com>
On Thu, Nov 06, 2014 at 09:36:49AM +0100, Krzysztof Kozlowski wrote:
> This patch adds both normal PM suspend/resume support and runtime PM
> support to pl330 DMA engine driver.
>
> The runtime power management for pl330 DMA driver allows gating of AMBA
> clock (PDMA) in FSYS clock domain, when the device is not processing any
> requests. This is necessary to enter low power modes on Exynos SoCs
> (e.g. LPA on Exynos4x12 or W-AFTR on Exynos3250).
>
> Runtime PM resuming of the device may happen in atomic context (during
> call device_issue_pending()) so pm_runtime_irq_safe() is used. This will
> lead only to disabling/enabling of the clock but this is sufficient for
> gating the clock and for reducing energy usage.
>
> During system sleep the AMBA bus clock is also unprepared.
Acked-by: Vinod Koul <vinod.koul@intel.com>
--
~Vinod
next prev parent reply other threads:[~2014-11-06 12:44 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-06 8:36 [PATCH v10 0/5] amba/dmaengine: pl330: add Power Management support Krzysztof Kozlowski
2014-11-06 8:36 ` [PATCH v10 1/5] PM / Runtime: Allow accessing irq_safe if no PM_RUNTIME Krzysztof Kozlowski
2014-11-06 10:00 ` Ulf Hansson
2014-11-06 22:51 ` Rafael J. Wysocki
2014-11-07 8:06 ` Krzysztof Kozlowski
2014-11-07 14:50 ` Alan Stern
2014-11-07 23:45 ` Rafael J. Wysocki
2014-11-10 14:11 ` Ulf Hansson
2014-11-10 16:36 ` Alan Stern
2014-11-10 18:35 ` Ulf Hansson
2014-11-10 18:59 ` Alan Stern
2014-11-12 8:56 ` Krzysztof Kozlowski
2014-11-12 10:39 ` Ulf Hansson
2014-11-12 10:44 ` Krzysztof Kozlowski
2014-11-12 16:34 ` Alan Stern
2014-11-13 10:22 ` Ulf Hansson
2014-11-13 15:55 ` Alan Stern
2014-11-10 13:38 ` Ulf Hansson
2014-11-10 13:43 ` Srikanth K
2014-11-06 8:36 ` [PATCH v10 2/5] amba: Add helpers for (un)preparing AMBA clock Krzysztof Kozlowski
2014-11-06 8:36 ` [PATCH v10 3/5] amba: Don't unprepare the clocks if device driver wants IRQ safe runtime PM Krzysztof Kozlowski
2014-11-06 10:03 ` Ulf Hansson
2014-11-06 22:52 ` Rafael J. Wysocki
2014-11-07 8:01 ` Krzysztof Kozlowski
2014-11-07 23:52 ` Rafael J. Wysocki
2014-11-06 8:36 ` [PATCH v10 4/5] dmaengine: pl330: add Power Management support Krzysztof Kozlowski
2014-11-06 12:45 ` Vinod Koul [this message]
2014-11-06 8:36 ` [PATCH v10 5/5] amba: Remove unused amba_pclk_enable/disable macros Krzysztof Kozlowski
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