linux-kernel - Re: [PATCH] memory: mtk-smi: Add PM suspend and resume ops

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Message-ID: <20191015123053.GA17570@8bytes.org>
Date:   Tue, 15 Oct 2019 14:30:53 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Yong Wu <yong.wu@...iatek.com>
Cc:     Matthias Brugger <matthias.bgg@...il.com>,
        Will Deacon <will.deacon@....com>,
        Evan Green <evgreen@...omium.org>,
        Robin Murphy <robin.murphy@....com>,
        Tomasz Figa <tfiga@...gle.com>,
        linux-mediatek@...ts.infradead.org, srv_heupstream@...iatek.com,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org, youlin.pei@...iatek.com,
        Nicolas Boichat <drinkcat@...omium.org>, anan.sun@...iatek.com,
        ming-fan.chen@...iatek.com
Subject: Re: [PATCH] memory: mtk-smi: Add PM suspend and resume ops

On Wed, Oct 09, 2019 at 07:59:33PM +0800, Yong Wu wrote:
> In the commit 4f0a1a1ae351 ("memory: mtk-smi: Invoke pm runtime_callback
> to enable clocks"), we use pm_runtime callback to enable/disable the smi
> larb clocks. It will cause the larb's clock may not be disabled when
> suspend. That is because device_prepare will call pm_runtime_get_noresume
> which will keep the larb's PM runtime status still is active when suspend,
> then it won't enter our pm_runtime suspend callback to disable the
> corresponding clocks.
> 
> This patch adds suspend pm_ops to force disable the clocks, Use "LATE" to
> make sure it disable the larb's clocks after the multimedia devices.
> 
> Fixes: 4f0a1a1ae351 ("memory: mtk-smi: Invoke pm runtime_callback to enable clocks")
> Signed-off-by: Anan Sun <anan.sun@...iatek.com>
> Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> ---
> base on v5.4-rc1.
> ---
>  drivers/memory/mtk-smi.c | 4 ++++
>  1 file changed, 4 insertions(+)

Applied, thanks.