linux-kernel - Re: One bug of SDHCI driver

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Message-id: <53D8691B.8080904@samsung.com>
Date:	Wed, 30 Jul 2014 12:40:11 +0900
From:	Jaehoon Chung <jh80.chung@...sung.com>
To:	"Fu, Zhonghui" <zhonghui.fu@...ux.intel.com>,
	Chris Ball <chris@...ntf.net>
Cc:	ulf.hansson@...aro.org, tgih.jun@...sung.com, aaron.lu@...el.com,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	jackey.shen@....com, gregkh@...uxfoundation.org
Subject: Re: One bug of SDHCI driver

Hi, Zhonghui.

On 07/30/2014 11:47 AM, Fu, Zhonghui wrote:
> 
> Hi,
> 
> In the resume function, SDIO irq must be enabled, or the interrupts from devices on SDIO bus can't be acknowledged. I also uploaded this new patch to https://bugzilla.kernel.org/show_bug.cgi?id=80151.
> Could you please help to review it?
> 
> 
> 
> 
> Thanks,
> Zhonghui
> 
> On 2014/7/24 23:27, Fu, Zhonghui wrote:
>> Hi,
>>
>> Any comments for this new patch?
>>
>> Thanks,
>> Zhonghui
>> On 2014/7/20 22:51, Fu, Zhonghui wrote:
>>> Hi,
>>>
>>> Chris' patch is not enough to fix this bug. I made a patch as follows and verified it can work.  Could you please give out some comments about this patch?
>>>
>>>
>>> Thanks,
>>> Zhonghui
>>>
>>> >From 72d6f5b56fa04290fd3a055a3333de1d89e7c8d4 Mon Sep 17 00:00:00 2001
>>> From: Fu Zhonghui <zhonghui.fu@...ux.intel.com>
>>> Date: Sun, 20 Jul 2014 22:29:53 +0800
>>> Subject: [PATCH] mmc: core: sdio: Fix unconditional wake_up_process() on sdio thread
>>>
>>> 781e989cf59 ("mmc: sdhci: convert to new SDIO IRQ handling") and
>>> bf3b5ec66bd ("mmc: sdio_irq: rework sdio irq handling") disabled
>>> the use of our own custom threaded IRQ handler, but left in an
>>> unconditional wake_up_process() on that handler at resume-time.
>>>
>>> Signed-off-by: Fu Zhonghui <zhonghui.fu@...ux.intel.com>
>>> ---
>>>  drivers/mmc/core/sdio.c |   14 ++++++++++++--
>>>  1 files changed, 12 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
>>> index e636d9e..8369e56 100644
>>> --- a/drivers/mmc/core/sdio.c
>>> +++ b/drivers/mmc/core/sdio.c
>>> @@ -992,8 +992,18 @@ static int mmc_sdio_resume(struct mmc_host *host)
>>>  		}
>>>  	}
>>>  
>>> -	if (!err && host->sdio_irqs)
>>> -		wake_up_process(host->sdio_irq_thread);
>>> +	if (!err && host->sdio_irqs) {
>>> +		if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD)) {
>>> +			wake_up_process(host->sdio_irq_thread);
>>> +		} else {
>>> +			mmc_release_host(host);
>>> +			mmc_host_clk_hold(host);
>>> +			host->ops->enable_sdio_irq(host, 1);
>>> +			mmc_host_clk_release(host);
>>> +			mmc_claim_host(host);
>>> +		}
>>> +	}
If you enable the sdio_irq, I think it needs to check whether MMC_CAP_SDIO_IRQ is set or not.


Best Regards,
Jaehoon Chung
>>> +
>>>  	mmc_release_host(host);
>>>  
>>>  	host->pm_flags &= ~MMC_PM_KEEP_POWER;
>>> -- 1.7.1
>>>
>>>
>>>
>>> On 2014/7/15 12:40, Jaehoon Chung wrote:
>>>> From: Chris Ball <chris@...ntf.net>
>>>> Subject: [PATCH] mmc: core: sdio: Fix unconditional wake_up_process() on sdio thread
>>>>
>>>> 781e989cf59 ("mmc: sdhci: convert to new SDIO IRQ handling") and
>>>> bf3b5ec66bd ("mmc: sdio_irq: rework sdio irq handling") disabled
>>>> the use of our own custom threaded IRQ handler, but left in an
>>>> unconditional wake_up_process() on that handler at resume-time.
>>>>
>>>> Reported-by: Fu, Zhonghui <zhonghui.fu@...ux.intel.com>
>>>> [Patch suggested by Jaehoon Chung]
>>>> Signed-off-by: Chris Ball <chris@...ntf.net>
>>>> ---
>>>>  drivers/mmc/core/sdio.c |    3 ++-
>>>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>>>
>>>> diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
>>>> index e636d9e..11cc4e0 100644
>>>> --- a/drivers/mmc/core/sdio.c
>>>> +++ b/drivers/mmc/core/sdio.c
>>>> @@ -992,7 +992,8 @@ static int mmc_sdio_resume(struct mmc_host *host)
>>>>  		}
>>>>  	}
>>>>  
>>>> -	if (!err && host->sdio_irqs)
>>>> +	if (!err && host->sdio_irqs &&
>>>> +			!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD))
>>>>  		wake_up_process(host->sdio_irq_thread);
>>>>  	mmc_release_host(host);
>>>>  
>>> --
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> 

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