linux-kernel - Re: [PATCH 3/3] scsi:stex.c Add S3/S4 support

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Date:	Fri, 29 Jan 2016 19:23:41 +0800
From:	Charles Chiou <ch1102chiou@...il.com>
To:	Johannes Thumshirn <jthumshirn@...e.de>
CC:	Christoph Hellwig <hch@...radead.org>, JBottomley@...allels.com,
	Oliver Neukum <oneukum@...e.de>, grace.chang@...promise.com,
	linus.chen@...promise.com, victor.p@...mise.com,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] scsi:stex.c Add S3/S4 support

Hi all, Ping?
Does this patch has others issues need to fix? Thank you.
Charles

On 09/03/2015 10:03 PM, Johannes Thumshirn wrote:
> Charles Chiou <ch1102chiou@...il.com> writes:
>
>>  From f442518879f8f41d103b684046d912eca13844e7 Mon Sep 17 00:00:00 2001
>> From: Charles <charles.chiou@...promise.com>
>> Date: Wed, 2 Sep 2015 20:54:45 +0800
>> Subject: [PATCH 3/3] scsi:stex.c Add S3/S4 support
>>
>> Add S3/S4 support, add .suspend and .resume function in pci_driver.
>> In .suspend handler, driver send S3/S4 signal to the device.
>>
>> V2: Remove blank lines
>>
>> Signed-off-by: Charles Chiou <charles.chiou@...promise.com>
>> ---
>>   drivers/scsi/stex.c | 59 ++++++++++++++++++++++++++++++++++++++++++++++++++---
>>   1 file changed, 56 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/scsi/stex.c b/drivers/scsi/stex.c
>> index 4ef0c80..c96a86d 100644
>> --- a/drivers/scsi/stex.c
>> +++ b/drivers/scsi/stex.c
>> @@ -166,6 +166,13 @@ enum {
>>
>>   	ST_ADDITIONAL_MEM			= 0x200000,
>>   	ST_ADDITIONAL_MEM_MIN			= 0x80000,
>> +	PMIC_SHUTDOWN				= 0x0D,
>> +	PMIC_REUMSE					= 0x10,
>> +	ST_IGNORED					= -1,
>> +	ST_S3						= 3,
>> +	ST_S4						= 4,
>> +	ST_S5						= 5,
>> +	ST_S6						= 6,
>>   };
>>
>>   struct st_sgitem {
>> @@ -1733,7 +1740,7 @@ out_disable:
>>   	return err;
>>   }
>>
>> -static void stex_hba_stop(struct st_hba *hba)
>> +static void stex_hba_stop(struct st_hba *hba, int st_sleep_mic)
>>   {
>>   	struct req_msg *req;
>>   	struct st_msg_header *msg_h;
>> @@ -1749,11 +1756,18 @@ static void stex_hba_stop(struct st_hba *hba)
>>   	} else
>>   		memset(req, 0, hba->rq_size);
>>
>> -	if (hba->cardtype == st_yosemite || hba->cardtype == st_yel) {
>> +	if ((hba->cardtype == st_yosemite || hba->cardtype == st_yel)
>> +		&& st_sleep_mic == ST_IGNORED) {
>>   		req->cdb[0] = MGT_CMD;
>>   		req->cdb[1] = MGT_CMD_SIGNATURE;
>>   		req->cdb[2] = CTLR_CONFIG_CMD;
>>   		req->cdb[3] = CTLR_SHUTDOWN;
>> +	} else if (hba->cardtype == st_yel && st_sleep_mic != ST_IGNORED) {
>> +		req->cdb[0] = MGT_CMD;
>> +		req->cdb[1] = MGT_CMD_SIGNATURE;
>> +		req->cdb[2] = CTLR_CONFIG_CMD;
>> +		req->cdb[3] = PMIC_SHUTDOWN;
>> +		req->cdb[4] = st_sleep_mic;
>>   	} else {
>>   		req->cdb[0] = CONTROLLER_CMD;
>>   		req->cdb[1] = CTLR_POWER_STATE_CHANGE;
>> @@ -1773,10 +1787,12 @@ static void stex_hba_stop(struct st_hba *hba)
>>   	while (hba->ccb[tag].req_type & PASSTHRU_REQ_TYPE) {
>>   		if (time_after(jiffies, before + ST_INTERNAL_TIMEOUT * HZ)) {
>>   			hba->ccb[tag].req_type = 0;
>> +			hba->mu_status = MU_STATE_STOP;
>>   			return;
>>   		}
>>   		msleep(1);
>>   	}
>> +	hba->mu_status = MU_STATE_STOP;
>>   }
>>
>>   static void stex_hba_free(struct st_hba *hba)
>> @@ -1816,9 +1832,44 @@ static void stex_shutdown(struct pci_dev *pdev)
>>   {
>>   	struct st_hba *hba = pci_get_drvdata(pdev);
>>
>> -	stex_hba_stop(hba);
>> +	if (hba->supports_pm == 0)
>> +		stex_hba_stop(hba, ST_IGNORED);
>> +	else
>> +		stex_hba_stop(hba, ST_S5);
>> +}
>> +
>> +static int stex_choice_sleep_mic(pm_message_t state)
>> +{
>> +	switch (state.event) {
>> +	case PM_EVENT_SUSPEND:
>> +		return ST_S3;
>> +	case PM_EVENT_FREEZE:
>> +	case PM_EVENT_HIBERNATE:
>> +		return ST_S4;
>> +	default:
>> +		return ST_S4;
>> +	}
>> +}
>> +
>> +static int stex_suspend(struct pci_dev *pdev, pm_message_t state)
>> +{
>> +	struct st_hba *hba = pci_get_drvdata(pdev);
>> +
>> +	if (hba->cardtype == st_yel && hba->supports_pm == 1)
>> +		stex_hba_stop(hba, stex_choice_sleep_mic(state));
>> +	else
>> +		stex_hba_stop(hba, ST_IGNORED);
>> +	return 0;
>>   }
>>
>> +static int stex_resume(struct pci_dev *pdev)
>> +{
>> +	struct st_hba *hba = pci_get_drvdata(pdev);
>> +
>> +	hba->mu_status = MU_STATE_STARTING;
>> +	stex_handshake(hba);
>> +	return 0;
>> +}
>>   MODULE_DEVICE_TABLE(pci, stex_pci_tbl);
>>
>>   static struct pci_driver stex_pci_driver = {
>> @@ -1827,6 +1878,8 @@ static struct pci_driver stex_pci_driver = {
>>   	.probe		= stex_probe,
>>   	.remove		= stex_remove,
>>   	.shutdown	= stex_shutdown,
>> +	.suspend	= stex_suspend,
>> +	.resume		= stex_resume,
>>   };
>>
>>   static int __init stex_init(void)
>
> Looks OK from my side
> Reviewed-by: Johannes Thumshirn <jthumshirn@...e.de>
>