linux-kernel - Re: [PATCH v1] mmc: sdhci-msm: Enable aggressive PM

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Message-ID: <Z0a1vdps0wHidSll@cse-cd02-lnx.ap.qualcomm.com>
Date: Wed, 27 Nov 2024 14:01:33 +0800
From: Yuanjie Yang <quic_yuanjiey@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, <adrian.hunter@...el.com>,
        <ulf.hansson@...aro.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-mmc@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: <quic_tingweiz@...cinc.com>, <quic_zhgao@...cinc.com>,
        <quic_yuanjiey@...cinc.com>
Subject: Re: [PATCH v1] mmc: sdhci-msm: Enable aggressive PM

On Wed, Nov 27, 2024 at 06:00:34AM +0200, Dmitry Baryshkov wrote:
> On Wed, Nov 27, 2024 at 11:17:08AM +0800, Yuanjie Yang wrote:
> > The sdhci-msm driver supports the device in both RUNNING
> > and IDLE states, when eMMC/SD are not reading or writing,
> > eMMC/SD are in IDLE state, the power management module
> > will suspend the device(power off and reduce frequency,
> > etc.), putting the device into a low-power mode. But the
> > current sdhci-msm driver cannot put device enter into
> > low-power mode.
> > 
> > Enable aggressive PM capability to support runtime PM
> > functionality, allowing the eMMC/SD card to enter
> > lowe-power mode.
> > 
> > Signed-off-by: Yuanjie Yang <quic_yuanjiey@...cinc.com>
> 
> What is the difference to [1] ?
> 
> [1] https://lore.kernel.org/linux-arm-msm/20241104060722.10642-1-quic_sartgarg@quicinc.com

Thanks for your reminder, I didn't notice there was already a patch. I'll
check upstream first in the future. I will close this patch.

> > ---
> >  drivers/mmc/host/sdhci-msm.c | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
> > index e00208535bd1..e3444d223513 100644
> > --- a/drivers/mmc/host/sdhci-msm.c
> > +++ b/drivers/mmc/host/sdhci-msm.c
> > @@ -2627,6 +2627,7 @@ static int sdhci_msm_probe(struct platform_device *pdev)
> >  	}
> >  
> >  	msm_host->mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY | MMC_CAP_NEED_RSP_BUSY;
> > +	msm_host->mmc->caps |= MMC_CAP_AGGRESSIVE_PM;
> >  
> >  	/* Set the timeout value to max possible */
> >  	host->max_timeout_count = 0xF;
> > -- 
> > 2.34.1
> > 
> 
> -- 
> With best wishes
> Dmitry

Thanks,
Yuanjie