linux-kernel - Re: [PATCH V3 2/2] PCI: vmd: Override ASPM on TGL/ADL VMD devices

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Date:   Tue, 14 Dec 2021 09:33:11 -0800
From:   "David E. Box" <david.e.box@...ux.intel.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     nirmal.patel@...ux.intel.com, jonathan.derrick@...ux.dev,
        lorenzo.pieralisi@....com, robh@...nel.org, kw@...ux.com,
        bhelgaas@...gle.com, michael.a.bottini@...ux.intel.com,
        rafael@...nel.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, Adhitya Mohan <me@...ityamohan.in>
Subject: Re: [PATCH V3 2/2] PCI: vmd: Override ASPM on TGL/ADL VMD devices

On Mon, 2021-12-13 at 23:56 -0800, Christoph Hellwig wrote:
> On Thu, Dec 09, 2021 at 12:12:35PM -0800, David E. Box wrote:
> > +static int vmd_enable_aspm(struct pci_dev *pdev, void *userdata)
> > +{
> > +	int features = *(int *)userdata;
> > +
> > +	if (features & VMD_FEAT_QUIRK_OVERRIDE_ASPM &&
> > +	    pdev->class == PCI_CLASS_STORAGE_EXPRESS) {
> > +		int pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_LTR);
> > +
> > +		if (pos) {
> > +			pci_write_config_word(pdev, pos + PCI_LTR_MAX_SNOOP_LAT,
> > 0x1003);
> > +			pci_write_config_word(pdev, pos +
> > PCI_LTR_MAX_NOSNOOP_LAT, 0x1003);
> > +			if (pcie_aspm_policy_override(pdev))
> > +				pci_info(pdev, "Unable of override ASPM
> > policy\n");
> > +		}
> 
> This is completely unredable due to the long lines.  Just return early on
> the two conditionals and it will all be fine.

Sure.

Thanks.