From: Stanley Chu <stanley.chu@mediatek.com>
To: Can Guo <cang@codeaurora.org>
Cc: linux-scsi@vger.kernel.org, martin.petersen@oracle.com,
andy.teng@mediatek.com, jejb@linux.ibm.com,
chun-hung.wu@mediatek.com, kuohong.wang@mediatek.com,
linux-kernel@vger.kernel.org, avri.altman@wdc.com,
linux-mediatek@lists.infradead.org, peter.wang@mediatek.com,
alim.akhtar@samsung.com, matthias.bgg@gmail.com,
asutoshd@codeaurora.org, bvanassche@acm.org,
linux-arm-kernel@lists.infradead.org, beanhuo@micron.com
Subject: Re: [PATCH v1 1/2] scsi: ufs: add required delay after gating reference clock
Date: Mon, 17 Feb 2020 21:12:48 +0800 [thread overview]
Message-ID: <1581945168.26304.4.camel@mtksdccf07> (raw)
In-Reply-To: <c6874825dd60ea04ed401fbd1b5cb568@codeaurora.org>
Hi Can,
> > } else if (!on && clki->enabled) {
> > clk_disable_unprepare(clki->clk);
> > + wait_us = hba->dev_info.clk_gating_wait_us;
> > + if (ref_clk && wait_us)
> > + usleep_range(wait_us, wait_us + 10);
>
> Hi Stanley,
>
> If wait_us is 1us, it would be inappropriate to use usleep_range() here.
> You have checks of the delay in patch #2, but why it is not needed here?
>
> Thanks,
> Can Guo.
You are right. I could make that delay checking as common function so it
can be used here as well to cover all possible values.
Thanks for suggestion.
Stanley
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next prev parent reply other threads:[~2020-02-17 13:13 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-17 9:35 [PATCH v1 0/2] scsi: ufs: fix waiting time for reference clock Stanley Chu
2020-02-17 9:35 ` [PATCH v1 1/2] scsi: ufs: add required delay after gating " Stanley Chu
2020-02-17 12:58 ` Can Guo
2020-02-17 13:12 ` Stanley Chu [this message]
2020-02-17 13:22 ` Can Guo
2020-02-17 13:34 ` Stanley Chu
2020-02-17 13:42 ` Can Guo
2020-02-19 2:35 ` Can Guo
2020-02-19 9:11 ` Stanley Chu
2020-02-19 10:33 ` Can Guo
2020-02-20 13:30 ` Stanley Chu
2020-02-17 16:17 ` Bart Van Assche
2020-02-18 0:50 ` Stanley Chu
2020-02-17 9:35 ` [PATCH v1 2/2] scsi: ufs: ufs-mediatek: add waiting time for " Stanley Chu
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