From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
To: Stefan Wahren <wahrenst@gmx.net>, helgaas@kernel.org
Cc: linux-usb@vger.kernel.org, linux-rpi-kernel@lists.infradead.org,
linux-arm-kernel@lists.infradead.org, tim.gover@raspberrypi.org,
linux-pci@vger.kernel.org, f.fainelli@gmail.com,
Greg KH <gregkh@linuxfoundation.org>,
linux-kernel@vger.kernel.org, RayJui <rjui@broadcom.com>,
ScottBranden <sbranden@broadcom.com>,
bcm-kernel-feedback-list@broadcom.com
Subject: Re: [PATCH v7 2/4] firmware: raspberrypi: Introduce vl805 init routine
Date: Mon, 04 May 2020 10:59:29 +0200 [thread overview]
Message-ID: <d105712418b93ebce7c0498d05eea77171892366.camel@suse.de> (raw)
In-Reply-To: <5fce05ca-5d7e-f4cc-be34-0764fbe4edff@gmx.net>
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Hi Stefan, thanks for the review!
On Sat, 2020-05-02 at 11:05 +0200, Stefan Wahren wrote:
> > + /* Make sure we don't trigger a firmware load unnecesarely *
> s/unnecesarely/unnecessarily/
Noted
> > + pci_read_config_dword(pdev, VL805_PCI_CONFIG_VERSION_OFFSET, &version);
> pci_read_config_dword() can fail, we might want to store the return value?
I planned on doing that, but realised that the vast majority of
pci_read_config_*() users pass on checking for errors.
Bjorn, any rule of thumb on when to check for errors here?
> > + if (version)
> > + goto exit;
> > +
> > + dev_addr = pdev->bus->number << 20 | PCI_SLOT(pdev->devfn) << 15 |
> > + PCI_FUNC(pdev->devfn) << 12;
> > +
> > + ret = rpi_firmware_property(fw, RPI_FIRMWARE_NOTIFY_XHCI_RESET,
> > + &dev_addr, sizeof(dev_addr));
> > + /* Wait for vl805 to startup */
> > + udelay(200);
>
> I know, it makes it harder to read but do we really want to wait
> unnecessarily if rpi_firmware_property failed?
Yes, I figured that it wouldn't hurt much at that faulty state, and you'll be
waiting some extra 5s further down the line in quirk_usb_handoff_xhci().
But if you feel it's more correct I'll be happy to change it.
> Btw i assume we are in non-atomic context, so maybe it's worth to use
> usleep_range() here?
Of course, I'll fix that.
Regards,
Nicolas
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next prev parent reply other threads:[~2020-05-04 8:59 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-29 16:47 [PATCH v7 0/4] USB: pci-quirks: Add Raspberry Pi 4 quirk Nicolas Saenz Julienne
2020-04-29 16:47 ` [PATCH v7 1/4] soc: bcm2835: Add notify xHCI reset property Nicolas Saenz Julienne
2020-04-29 16:47 ` [PATCH v7 2/4] firmware: raspberrypi: Introduce vl805 init routine Nicolas Saenz Julienne
2020-05-02 9:05 ` Stefan Wahren
2020-05-04 8:59 ` Nicolas Saenz Julienne [this message]
2020-05-04 19:06 ` Stefan Wahren
2020-05-04 22:52 ` Bjorn Helgaas
2020-04-29 16:47 ` [PATCH v7 3/4] PCI: brcmstb: Wait for Raspberry Pi's firmware when present Nicolas Saenz Julienne
2020-04-29 16:47 ` [PATCH v7 4/4] USB: pci-quirks: Add Raspberry Pi 4 quirk Nicolas Saenz Julienne
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