linux-kernel - RE: [PATCH v7 6/8] PCI: dwc: Add dw_pcie_host_ops.host

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Date:   Thu, 24 Feb 2022 07:50:25 +0000
From:   Hongxing Zhu <hongxing.zhu@....com>
To:     Bjorn Helgaas <helgaas@...nel.org>
CC:     "l.stach@...gutronix.de" <l.stach@...gutronix.de>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
        "jingoohan1@...il.com" <jingoohan1@...il.com>,
        "festevam@...il.com" <festevam@...il.com>,
        "francesco.dolcini@...adex.com" <francesco.dolcini@...adex.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH v7 6/8] PCI: dwc: Add dw_pcie_host_ops.host_exit()
 callback

> -----Original Message-----
> From: Bjorn Helgaas <helgaas@...nel.org>
> Sent: 2022年2月24日 1:50
> To: Hongxing Zhu <hongxing.zhu@....com>
> Cc: l.stach@...gutronix.de; bhelgaas@...gle.com; broonie@...nel.org;
> lorenzo.pieralisi@....com; jingoohan1@...il.com; festevam@...il.com;
> francesco.dolcini@...adex.com; linux-pci@...r.kernel.org;
> linux-arm-kernel@...ts.infradead.org; linux-kernel@...r.kernel.org;
> kernel@...gutronix.de; dl-linux-imx <linux-imx@....com>
> Subject: Re: [PATCH v7 6/8] PCI: dwc: Add dw_pcie_host_ops.host_exit()
> callback
> 
> On Wed, Feb 16, 2022 at 02:21:01PM +0800, Richard Zhu wrote:
> > When link is never came up in the link training after host_init.
> > The clocks and power supplies usage counter balance should be handled
> > properly on some DWC platforms (for example, i.MX PCIe).
> >
> > Add a new host_exit() callback into dw_pcie_host_ops, then it could be
> > invoked to handle the unbalance issue in the error handling after
> > host_init() function when link is down.
> 
> Possible rewording, not sure if it captures everything you want:
> 
>   When the link never comes up after ->host_init(), some drivers,
>   especially those that don't support hotplug, want to turn off clocks
>   and power supplies.
> 
>   Add a new ->host_exit() callback in dw_pcie_host_ops so these
>   drivers can clean up if ->host_init() fails.

Thanks, it's more detailed, and easier understand. Would be updated later.

Best Regards
Richard Zhu