linux-kernel - Re: [PATCH v3 4/4] USB: pci-quirks: Add Raspberry Pi 4 quirk

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Date:   Wed, 4 Mar 2020 10:05:55 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Cc:     linux-kernel@...r.kernel.org,
        Mathias Nyman <mathias.nyman@...el.com>,
        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,
        tim.gover@...pberrypi.org, linux-pci@...r.kernel.org,
        wahrenst@....net
Subject: Re: [PATCH v3 4/4] USB: pci-quirks: Add Raspberry Pi 4 quirk

On Mon, Mar 02, 2020 at 04:55:28PM +0100, 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,
> reflect that on the firmware interface Kconfg.
> 
> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
> 
> ---
> 
> 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 | 18 ++++++++++++++++++
>  2 files changed, 19 insertions(+)
> 
> diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig
> index ea869addc89b..40a468d712a5 100644
> --- a/drivers/firmware/Kconfig
> +++ b/drivers/firmware/Kconfig
> @@ -180,6 +180,7 @@ config ISCSI_IBFT
>  config RASPBERRYPI_FIRMWARE
>  	tristate "Raspberry Pi Firmware Driver"
>  	depends on BCM2835_MBOX
> +	default XHCI_PCI
>  	help
>  	  This option enables support for communicating with the firmware on the
>  	  Raspberry Pi.
> diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c
> index beb2efa71341..aee2eaa3f0e1 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 +1246,26 @@ 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 else, something
> +			 * failed, keep going and hope for the best.
> +			 */
> +			dev_warn(&pdev->dev,
> +				 "Failed to load VL805's firmware: %d\n",
> +				 ret);

{} please.

Also, you might want to provide a better warning, something like:
	"Failed to load VL805's firmware, will continue to attempt to
	work, but bad things might happen, you should fix this..."

or something to give people a chance to know what to do here.

thanks,

greg k-h