linux-kernel - Re: [PATCH v1 2/3] PCI: imx6: move the wait for clock stabilization to enable ref clk

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Message-ID: <ZsRAgfKJ5VZ98AZM@eichest-laptop>
Date: Tue, 20 Aug 2024 09:06:41 +0200
From: Stefan Eichenberger <eichest@...il.com>
To: Frank Li <Frank.li@....com>
Cc: hongxing.zhu@....com, l.stach@...gutronix.de, lpieralisi@...nel.org,
	kw@...ux.com, robh@...nel.org, bhelgaas@...gle.com,
	shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
	festevam@...il.com, francesco.dolcini@...adex.com,
	linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	imx@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Stefan Eichenberger <stefan.eichenberger@...adex.com>
Subject: Re: [PATCH v1 2/3] PCI: imx6: move the wait for clock stabilization
 to enable ref clk

On Mon, Aug 19, 2024 at 10:45:13AM -0400, Frank Li wrote:
> On Mon, Aug 19, 2024 at 11:03:18AM +0200, Stefan Eichenberger wrote:
> > From: Stefan Eichenberger <stefan.eichenberger@...adex.com>
> >
> > After enabling the ref clock, we should wait for the clock to stabilize.
> > To eliminate the need for code duplication in the future, move the
> > usleep to the enable_ref_clk function.
> 
> Logically, it's better wait in imx6_pcie_clk_enable(). But not sure why
> it can reduce duplication.

I'm using the imx6_pcie_clk_enable in the if statement on resume for the
i.MX6Q. If the sleep is not in there I have to add it there as well. I
will check if this is still necessary with your changes and if so would
update the commit message.