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

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Date:   Sat, 7 Mar 2020 12:54:27 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        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

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).

[...]

MBR, Sergei