linux-kernel - Re: [linux-sunxi] [PATCH v3 1/3] mmc: sunxi: fix timeout in sunxi_mmc_oclk

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Message-ID: <55CB5CE6.1000303@redhat.com>
Date:	Wed, 12 Aug 2015 16:49:10 +0200
From:	Hans de Goede <hdegoede@...hat.com>
To:	Michal Suchanek <hramrach@...il.com>, linux-sunxi@...glegroups.com,
	Seungwon Jeon <tgih.jun@...sung.com>,
	Jaehoon Chung <jh80.chung@...sung.com>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	David Lanzendörfer <david.lanzendoerfer@....ch>,
	Chen-Yu Tsai <wens@...e.org>,
	Tomeu Vizoso <tomeu.vizoso@...labora.com>,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [linux-sunxi] [PATCH v3 1/3] mmc: sunxi: fix timeout in
 sunxi_mmc_oclk_onoff

Hi,

On 08/12/2015 03:29 PM, Michal Suchanek wrote:
> The 250ms timeout is too short.
>
> On my system enabling the oclk takes under 50ms and disabling slightly
> over 100ms when idle. Under load disabling the clock can take over
> 350ms.
>
> This does not make mmc clock gating look like good option to have on
> sunxi but the system should not crash with mmc clock gating enabled
> nonetheless.
>
> This patch sets the timeout to 750ms.
>
> Signed-off-by: Michal Suchanek <hramrach@...il.com>
>
> ---
> v3
>   - remove debug message

Thanks, this one looks good to me:

Acked-by: Hans de Goede <hdegoede@...hat.com>

Ulf, can you apply this one please?

Thanks & Regards,

Hans


> v2
>   - fix formatting
> ---
>   drivers/mmc/host/sunxi-mmc.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c
> index 4d3e1ff..a7b7a67 100644
> --- a/drivers/mmc/host/sunxi-mmc.c
> +++ b/drivers/mmc/host/sunxi-mmc.c
> @@ -595,7 +595,7 @@ static irqreturn_t sunxi_mmc_handle_manual_stop(int irq, void *dev_id)
>
>   static int sunxi_mmc_oclk_onoff(struct sunxi_mmc_host *host, u32 oclk_en)
>   {
> -	unsigned long expire = jiffies + msecs_to_jiffies(250);
> +	unsigned long expire = jiffies + msecs_to_jiffies(750);
>   	u32 rval;
>
>   	rval = mmc_readl(host, REG_CLKCR);
>
--
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