linux-kernel - Re: [PATCH] ACPI / platform / LPSS: disable async suspend/resume of LPSS devices

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Date:	Sat, 13 Sep 2014 01:53:55 +0800
From:	"Fu, Zhonghui" <zhonghui.fu@...ux.intel.com>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>
CC:	rjw@...ysocki.net, lenb@...nel.org, linux-acpi@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ACPI / platform / LPSS: disable async suspend/resume
 of LPSS devices


On 2014/9/10 15:50, Mika Westerberg wrote:
> On Tue, Sep 09, 2014 at 01:36:48PM +0800, Fu, Zhonghui wrote:
>> >From 6deb00230f5df68da3ca7490402a0c537bf386bb Mon Sep 17 00:00:00 2001
>> From: Fu Zhonghui <zhonghui.fu@...ux.intel.com>
>> Date: Tue, 9 Sep 2014 13:02:25 +0800
>> Subject: [PATCH] ACPI / platform / LPSS: disable async suspend/resume of LPSS devices
>>
>> LPSS devices must suspend/resume in fixed order. Or some LPSS devices
>> will hang during the transition to ACPI_STATE_D0 state.
> In addition to the comment from Rafael, I would like to have more
> details here why we must suspend/resume the LPSS devices in certain
> order.
Sorry for late response.

After the patch "ACPI / platform / LPSS: Enable async suspend/resume of LPSS devices(commit ID: 8ce62f85a81f57e86bc120ab690facc612223188)" was merged into upstream kernel, some LPSS devices(UART, I2C) frequently hang during resume. So, my patch is actually reverting that patch.


>
>> Signed-off-by: Li Aubrey <aubrey.li@...ux.intel.com>
>> Signed-off-by: Fu Zhonghui <zhonghui.fu@...ux.intel.com>
>> ---
>>  drivers/acpi/acpi_lpss.c |    2 +-
>>  1 files changed, 1 insertions(+), 1 deletions(-)
>>
>> diff --git a/drivers/acpi/acpi_lpss.c b/drivers/acpi/acpi_lpss.c
>> index fddc1e8..54e5c97 100644
>> --- a/drivers/acpi/acpi_lpss.c
>> +++ b/drivers/acpi/acpi_lpss.c
>> @@ -419,7 +419,7 @@ static int acpi_lpss_create_device(struct acpi_device *adev,
>>  	adev->driver_data = pdata;
>>  	pdev = acpi_create_platform_device(adev);
>>  	if (!IS_ERR_OR_NULL(pdev)) {
>> -		device_enable_async_suspend(&pdev->dev);
>> +		device_disable_async_suspend(&pdev->dev);
>>  		return 1;
>>  	}
>>  
>> -- 1.7.1
>>
>> --
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