linux-kernel - Re: [PATCH] PCI: Do not enable async suspend for JMicron chips

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Date:	Wed, 05 Nov 2014 09:35:24 +0800
From:	Aaron Lu <aaron.lu@...el.com>
To:	Chuansheng Liu <chuansheng.liu@...el.com>, bhelgaas@...gle.com,
	tj@...nel.org, rjw@...ysocki.net, mister.freeman@...oste.net
CC:	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI: Do not enable async suspend for JMicron chips

On 11/05/2014 09:33 AM, Aaron Lu wrote:
> On 11/05/2014 09:07 AM, Chuansheng Liu wrote:
>> The JMicron chip 361/363/368 contains one SATA controller and
>> one PATA controller, they are brother-relation ship in PCI tree,
>> but for powering on these both controller, we must follow the
>> sequence one by one, otherwise one of them can not be powered on
>> successfully.
>>
>> So here we disable the async suspend method for Jmicron chip.
>>
> 
> Place the buglink here?
> 
>   Buglink: https://bugzilla.kernel.org/show_bug.cgi?id=84861
>   Buglink: https://bugzilla.kernel.org/show_bug.cgi?id=81551
>> Cc: stable@...r.kernel.org # 3.15+
>> Signed-off-by: Chuansheng Liu <chuansheng.liu@...el.com>
> 
> Patch looks good to me, thanks for fixing this!

BTW, the previous change to the ATA code can be deleted now.
So maybe also put them into this patch.

Regards,
Aaron
 
>> ---
>>  drivers/pci/pci.c |   12 +++++++++++-
>>  1 file changed, 11 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
>> index 625a4ac..53128f0 100644
>> --- a/drivers/pci/pci.c
>> +++ b/drivers/pci/pci.c
>> @@ -2046,7 +2046,17 @@ void pci_pm_init(struct pci_dev *dev)
>>  	pm_runtime_forbid(&dev->dev);
>>  	pm_runtime_set_active(&dev->dev);
>>  	pm_runtime_enable(&dev->dev);
>> -	device_enable_async_suspend(&dev->dev);
>> +
>> +	/*
>> +	 * The JMicron chip 361/363/368 contains one SATA controller and
>> +	 * one PATA controller, they are brother-relation ship in PCI tree,
>> +	 * but for powering on these both controller, we must follow the
>> +	 * sequence one by one, otherwise one of them can not be powered on
>> +	 * successfully, so here we disable the async suspend method for
>> +	 * Jmicron chip.
>> +	 */
>> +	if (dev->vendor != PCI_VENDOR_ID_JMICRON)
>> +		device_enable_async_suspend(&dev->dev);
>>  	dev->wakeup_prepared = false;
>>  
>>  	dev->pm_cap = 0;
>>
> 

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