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From: Stanley Chu <stanley.chu@mediatek.com>
To: <asutoshd@codeaurora.org>
Cc: linux-scsi-owner@vger.kernel.org, linux-scsi@vger.kernel.org,
	martin.petersen@oracle.com, subhashj@codeaurora.org,
	jejb@linux.ibm.com, chun-hung.wu@mediatek.com,
	kuohong.wang@mediatek.com, linux-kernel@vger.kernel.org,
	stable@vger.kernel.org, avri.altman@wdc.com, cang@codeaurora.org,
	linux-mediatek@lists.infradead.org, peter.wang@mediatek.com,
	alim.akhtar@samsung.com, andy.teng@mediatek.com,
	matthias.bgg@gmail.com, beanhuo@micron.com,
	pedrom.sousa@synopsys.com, linux-arm-kernel@lists.infradead.org,
	bvanassche@acm.org
Subject: Re: [PATCH v1 1/2] scsi: ufs: set device as default active power mode during initialization only
Date: Tue, 31 Dec 2019 09:07:49 +0800	[thread overview]
Message-ID: <1577754469.13164.5.camel@mtkswgap22> (raw)
In-Reply-To: <fd129b859c013852bd80f60a36425757@codeaurora.org>

Hi Asutosh,


> I see that there's a get_sync done before.
> So, how would the suspend be triggered in that case?
> 

Would you mean pm_runtime_get_sync() in ufshcd_init()?
If yes, it will only happen during initialization.

The runtime resume path may go through ufshcd_probe_hba() without
ufshcd_init() invoked before, for example,

ufshcd_probe_hba+0xe10/0x1874
ufshcd_host_reset_and_restore+0x114/0x1a4
ufshcd_resume+0x1d0/0x480
ufshcd_runtime_resume+0x40/0x188
ufshcd_pltfrm_runtime_resume+0x10/0x18
pm_generic_runtime_resume+0x24/0x44
__rpm_callback+0x100/0x250
rpm_resume+0x548/0x7c8
rpm_resume+0x2b4/0x7c8
rpm_resume+0x2b4/0x7c8
rpm_resume+0x2b4/0x7c8
pm_runtime_work+0x9c/0xa0
process_one_work+0x210/0x4e0
worker_thread+0x390/0x520
kthread+0x154/0x18c
ret_from_fork+0x10/0x18

This case happens if link is in "off" state while resume.

Thanks,
Stanley
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  reply	other threads:[~2019-12-31  1:08 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-30  8:12 [PATCH v1 0/2] scsi: ufs: fix device power mode during PM flow Stanley Chu
2019-12-30  8:12 ` [PATCH v1 1/2] scsi: ufs: set device as default active power mode during initialization only Stanley Chu
2019-12-30 23:24   ` asutoshd
2019-12-31  1:07     ` Stanley Chu [this message]
2019-12-31  2:13       ` Can Guo
2019-12-31  4:22         ` Stanley Chu
2019-12-31  7:44           ` Stanley Chu
2019-12-31  8:35             ` Can Guo
2020-01-02  6:38               ` Stanley Chu
2020-01-03  1:51                 ` Can Guo
2020-01-03  5:28                   ` Can Guo
2020-01-17  7:57                     ` Stanley Chu
2020-01-05  7:55                 ` Avri Altman
2019-12-31  8:05           ` Can Guo
2019-12-30  8:12 ` [PATCH v1 2/2] scsi: ufs: remove link_startup_again flow in ufshcd_link_startup Stanley Chu

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