From: Hongxing Zhu <hongxing.zhu@nxp.com>
To: Bjorn Helgaas <helgaas@kernel.org>
Cc: "l.stach@pengutronix.de" <l.stach@pengutronix.de>,
"bhelgaas@google.com" <bhelgaas@google.com>,
"robh+dt@kernel.org" <robh+dt@kernel.org>,
"broonie@kernel.org" <broonie@kernel.org>,
"lorenzo.pieralisi@arm.com" <lorenzo.pieralisi@arm.com>,
"jingoohan1@gmail.com" <jingoohan1@gmail.com>,
"festevam@gmail.com" <festevam@gmail.com>,
"francesco.dolcini@toradex.com" <francesco.dolcini@toradex.com>,
"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"kernel@pengutronix.de" <kernel@pengutronix.de>,
dl-linux-imx <linux-imx@nxp.com>
Subject: RE: [PATCH v9 5/8] PCI: imx6: Refine the regulator usage
Date: Fri, 10 Jun 2022 07:09:35 +0000 [thread overview]
Message-ID: <AS8PR04MB86767131E8EA4AA6AC38192A8CA69@AS8PR04MB8676.eurprd04.prod.outlook.com> (raw)
In-Reply-To: <20220609172005.GA514802@bhelgaas>
> -----Original Message-----
> From: Bjorn Helgaas <helgaas@kernel.org>
> Sent: 2022年6月10日 1:20
> To: Hongxing Zhu <hongxing.zhu@nxp.com>
> Cc: l.stach@pengutronix.de; bhelgaas@google.com; robh+dt@kernel.org;
> broonie@kernel.org; lorenzo.pieralisi@arm.com; jingoohan1@gmail.com;
> festevam@gmail.com; francesco.dolcini@toradex.com;
> linux-pci@vger.kernel.org; linux-arm-kernel@lists.infradead.org;
> linux-kernel@vger.kernel.org; kernel@pengutronix.de; dl-linux-imx
> <linux-imx@nxp.com>
> Subject: Re: [PATCH v9 5/8] PCI: imx6: Refine the regulator usage
>
> On Thu, Jun 09, 2022 at 06:19:47AM +0000, Hongxing Zhu wrote:
> > > -----Original Message-----
> > > From: Bjorn Helgaas <helgaas@kernel.org>
> > > Sent: 2022年6月9日 2:55
> > > To: Hongxing Zhu <hongxing.zhu@nxp.com>
> > > Cc: l.stach@pengutronix.de; bhelgaas@google.com; robh+dt@kernel.org;
> > > broonie@kernel.org; lorenzo.pieralisi@arm.com; jingoohan1@gmail.com;
> > > festevam@gmail.com; francesco.dolcini@toradex.com;
> > > linux-pci@vger.kernel.org; linux-arm-kernel@lists.infradead.org;
> > > linux-kernel@vger.kernel.org; kernel@pengutronix.de; dl-linux-imx
> > > <linux-imx@nxp.com>
> > > Subject: Re: [PATCH v9 5/8] PCI: imx6: Refine the regulator usage
> > >
> > > On Fri, May 06, 2022 at 09:47:06AM +0800, Richard Zhu wrote:
> > > > The driver should undo any enables it did itself. The regulator
> > > > disable shouldn't be basing decisions on regulator_is_enabled().
>
> The driver should disable things if an error occurs after it has enabled
> something, or if it enabled something during probe and we're now detaching
> the driver. That doesn't look like the case here.
>
> > > > To keep the balance of the regulator usage counter, disable the
> > > > regulator just behind of imx6_pcie_assert_core_reset() in resume
> > > > and shutdown.
> > >
> > > In subject, "Refine" doesn't tell me anything about what's happening here.
> >
> > Thanks for your comments.
> > How about the following one?
> > PCI: imx6: Do regulator disable without the regulator_is_enabled check
>
> That's too low-level, like describing the C code line by line.
> I'm hoping for something about the purpose for the patch so "git log --oneline"
> can tell a coherent story.
>
> Apparently this is about disabling the power regulator when the slot isn't being
> used, so maybe it could say something about that.
>
> $ git grep -Ep "regulator_(en|dis)able" drivers/pci/controller/
>
> shows that in other drivers, this being done in
> probe/remove/suspend/resume-type paths. imx6 should be similar.
>
Got that, thanks a lot.
Best Regards
Richard Zhu
> Bjorn
next prev parent reply other threads:[~2022-06-10 7:09 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-06 1:47 [PATCH v9 0/8] PCI: imx6: refine codes and add compliance tests mode support Richard Zhu
2022-05-06 1:47 ` [PATCH v9 1/8] PCI: imx6: Encapsulate the clock enable into one standalone function Richard Zhu
2022-06-08 18:51 ` Bjorn Helgaas
2022-06-09 6:18 ` Hongxing Zhu
2022-05-06 1:47 ` [PATCH v9 2/8] PCI: imx6: Add the error propagation from host_init Richard Zhu
2022-06-08 18:53 ` Bjorn Helgaas
2022-06-09 6:19 ` Hongxing Zhu
2022-05-06 1:47 ` [PATCH v9 3/8] PCI: imx6: Move imx6_pcie_clk_disable() earlier Richard Zhu
2022-06-08 7:14 ` Lucas Stach
2022-05-06 1:47 ` [PATCH v9 4/8] PCI: imx6: Disable iMX6QDL PCIe REF clock when disable PCIe clocks Richard Zhu
2022-06-08 7:18 ` Lucas Stach
2022-05-06 1:47 ` [PATCH v9 5/8] PCI: imx6: Refine the regulator usage Richard Zhu
2022-06-08 7:26 ` Lucas Stach
2022-06-09 6:17 ` Hongxing Zhu
2022-06-09 7:47 ` Lucas Stach
2022-06-09 7:54 ` Hongxing Zhu
2022-06-08 18:54 ` Bjorn Helgaas
2022-06-09 6:19 ` Hongxing Zhu
2022-06-09 17:20 ` Bjorn Helgaas
2022-06-10 7:09 ` Hongxing Zhu [this message]
2022-05-06 1:47 ` [PATCH v9 6/8] PCI: imx6: Disable clocks and regulators after link is down Richard Zhu
2022-06-08 7:35 ` Lucas Stach
2022-06-09 6:17 ` Hongxing Zhu
2022-06-09 7:53 ` Francesco Dolcini
2022-06-09 8:36 ` Hongxing Zhu
2022-06-09 7:55 ` Lucas Stach
2022-06-09 8:30 ` Hongxing Zhu
2022-05-06 1:47 ` [PATCH v9 7/8] PCI: imx6: Move the phy driver callbacks to the proper places Richard Zhu
2022-06-08 7:44 ` Lucas Stach
2022-06-09 6:18 ` Hongxing Zhu
2022-06-08 18:57 ` Bjorn Helgaas
2022-06-09 6:20 ` Hongxing Zhu
2022-06-09 16:25 ` Bjorn Helgaas
2022-06-10 6:51 ` Hongxing Zhu
2022-05-06 1:47 ` [PATCH v9 8/8] PCI: imx6: Add compliance tests mode support Richard Zhu
2022-06-08 7:48 ` Lucas Stach
2022-06-09 6:18 ` Hongxing Zhu
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=AS8PR04MB86767131E8EA4AA6AC38192A8CA69@AS8PR04MB8676.eurprd04.prod.outlook.com \
--to=hongxing.zhu@nxp.com \
--cc=bhelgaas@google.com \
--cc=broonie@kernel.org \
--cc=festevam@gmail.com \
--cc=francesco.dolcini@toradex.com \
--cc=helgaas@kernel.org \
--cc=jingoohan1@gmail.com \
--cc=kernel@pengutronix.de \
--cc=l.stach@pengutronix.de \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-imx@nxp.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pci@vger.kernel.org \
--cc=lorenzo.pieralisi@arm.com \
--cc=robh+dt@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).