linux-kernel - Re: [PATCH v4 4/4] USB: pci-quirks: Add Raspberry Pi 4 quirk

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Date:   Mon, 09 Mar 2020 12:09:26 +0100
From:   Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
To:     Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        linux-kernel@...r.kernel.org,
        Mathias Nyman <mathias.nyman@...el.com>
Cc:     linux-usb@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        bcm-kernel-feedback-list@...adcom.com, f.fainelli@...il.com,
        gregkh@...uxfoundation.org, tim.gover@...pberrypi.org,
        linux-pci@...r.kernel.org, wahrenst@....net
Subject: Re: [PATCH v4 4/4] USB: pci-quirks: Add Raspberry Pi 4 quirk

On Sat, 2020-03-07 at 12:54 +0300, Sergei Shtylyov wrote:
> Hello!
> 
> On 06.03.2020 14:43, Nicolas Saenz Julienne wrote:
> 
> > On the Raspberry Pi 4, after a PCI reset, VL805's firmware may either be
> > loaded directly from an EEPROM or, if not present, by the SoC's
> > VideCore. Inform VideCore that VL805 was just reset.
> > 
> > Also, as this creates a dependency between XHCI_PCI and VideoCore's
> > firmware interface, reflect that on the firmware interface Kconfg.
> > 
> > Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
> > ---
> > 
> > Changes since v3:
> >   - Add more complete error message.
> >   - Add braces around if statement
> > 
> > Changes since v1:
> >   - Make RASPBERRYPI_FIRMWARE dependent on this quirk to make sure it
> >     gets compiled when needed.
> > 
> >   drivers/firmware/Kconfig      |  1 +
> >   drivers/usb/host/pci-quirks.c | 16 ++++++++++++++++
> >   2 files changed, 17 insertions(+)
> [...]
> > diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c
> > index beb2efa71341..452f5f12b042 100644
> > --- a/drivers/usb/host/pci-quirks.c
> > +++ b/drivers/usb/host/pci-quirks.c
> > @@ -16,6 +16,9 @@
> >   #include <linux/export.h>
> >   #include <linux/acpi.h>
> >   #include <linux/dmi.h>
> > +
> > +#include <soc/bcm2835/raspberrypi-firmware.h>
> > +
> >   #include "pci-quirks.h"
> >   #include "xhci-ext-caps.h"
> >   
> > @@ -1243,11 +1246,24 @@ static void quirk_usb_handoff_xhci(struct pci_dev
> > *pdev)
> >   
> >   static void quirk_usb_early_handoff(struct pci_dev *pdev)
> >   {
> > +	int ret;
> > +
> >   	/* Skip Netlogic mips SoC's internal PCI USB controller.
> >   	 * This device does not need/support EHCI/OHCI handoff
> >   	 */
> >   	if (pdev->vendor == 0x184e)	/* vendor Netlogic */
> >   		return;
> > +
> > +	if (pdev->vendor == PCI_VENDOR_ID_VIA && pdev->device == 0x3483) {
> > +		ret = rpi_firmware_init_vl805(pdev);
> > +		if (ret) {
> > +			/* Firmware might be outdated, or something failed */
> > +			dev_warn(&pdev->dev, "Failed to load VL805's firmware:
> > %d\n", ret);
> > +			dev_warn(&pdev->dev, "Will continue to attempt to work,
> > "
> > +				 "but bad things might happen. You should fix
> > this...\n");
> 
>     Don't break up the long kernel messages (checkpatch.pl should not
> complain 
> about them).

I generally don't, but in this specific case IMO it went way too long, as in
140 charaters long, so I figured it'd be better to split it. That said, I don't
really care, so I'll happily change it for v5.

Regards,
Nicolas


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