linux-kernel - Re: [PATCH v3] dmaegnine: fsl-edma: add runtime suspend/resume support

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Message-ID: <aadda4c7-a5b0-458c-bea7-59f1e983c1fd@linaro.org>
Date: Mon, 15 Sep 2025 18:40:20 +0300
From: Eugen Hristev <eugen.hristev@...aro.org>
To: Joy Zou <joy.zou@....com>, Frank Li <Frank.Li@....com>,
 Vinod Koul <vkoul@...nel.org>
Cc: imx@...ts.linux.dev, dmaengine@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] dmaegnine: fsl-edma: add runtime suspend/resume
 support



On 9/12/25 13:55, Joy Zou wrote:
> Introduce runtime suspend and resume support for FSL eDMA. Enable
> per-channel power domain management to facilitate runtime suspend and
> resume operations.
> 
> Implement runtime suspend and resume functions for the eDMA engine and
> individual channels.
> 
> Link per-channel power domain device to eDMA per-channel device instead of
> eDMA engine device. So Power Manage framework manage power state of linked
> domain device when per-channel device request runtime resume/suspend.
> 
> Trigger the eDMA engine's runtime suspend when all channels are suspended,
> disabling all common clocks through the runtime PM framework.
> 
> Signed-off-by: Joy Zou <joy.zou@....com>
> Signed-off-by: Frank Li <Frank.Li@....com>
> Reviewed-by: Frank Li <Frank.Li@....com>
> ---
> Changes for V3:
> - rebased onto commit 8f21d9da4670 ("Add linux-next specific files for 20250911")
>   to align with latest changes.
> - Remove pm_runtime_dont_use_autosuspend() from fsl_edma3_detach_pd().
>   because the autosuspend is not used.
> - Move some edma channel registers initialization after the chan_dev
>   pm_runtime_enable().
> - Add clk_prepare_enable() return check in fsl_edma_runtime_resume.
> - Add flag FSL_EDMA_DRV_HAS_DMACLK check in fsl_edma_runtime_resume/suspend().
> - Link to v2: https://lore.kernel.org/imx/20241226052643.1951886-1-joy.zou@nxp.com/
> 
> Changes for V2:
> - drop ret from fsl_edma_chan_runtime_suspend().
> - drop ret from fsl_edma_chan_runtime_resume() and return clk_prepare_enable().
> - add review tag
> - Link to v1: https://lore.kernel.org/imx/20241220021109.2102294-1-joy.zou@nxp.com/
> ---
> Changes in v4:
> - EDITME: describe what is new in this series revision.
> - EDITME: use bulletpoints and terse descriptions.
> - Link to v3: https://lore.kernel.org/r/20250912-b4-edma-runtime-v3-1-2d4a4f83603f@nxp.com
> ---

You have a typo in the subject, dmaegnine/dmaengine