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ARM: 8202/1: dmaengine: pl330: Add runtime Power Management support v12
This patch adds 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. Driver uses runtime PM callbacks from amba/bus.c driver only. Suggested-by: Bartlomiej Zolnierkiewicz <[email protected]> Signed-off-by: Krzysztof Kozlowski <[email protected]> Reviewed-by: Ulf Hansson <[email protected]> Acked-by: Vinod Koul <[email protected]> Signed-off-by: Russell King <[email protected]>
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