linux-kernel - Re: [PATCH v8 2/4] firmware: raspberrypi: Introduce vl805 init routine

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Date:   Sat, 09 May 2020 21:20:24 +0200
From:   Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
To:     Stefan Wahren <wahrenst@....net>
Cc:     Rob Herring <robh@...nel.org>, f.fainelli@...il.com,
        Scott Branden <sbranden@...adcom.com>,
        Ray Jui <rjui@...adcom.com>, linux-usb@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        tim.gover@...pberrypi.org, helgaas@...nel.org,
        linux-rpi-kernel@...ts.infradead.org, gregkh@...uxfoundation.org,
        bcm-kernel-feedback-list@...adcom.com,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v8 2/4] firmware: raspberrypi: Introduce vl805 init
 routine

On Sat, 2020-05-09 at 12:02 +0200, Stefan Wahren wrote:
> Hi Nicolas,
> 
> Am 07.05.20 um 23:48 schrieb Rob Herring:
> > On Tue,  5 May 2020 18:13:15 +0200, Nicolas Saenz Julienne wrote:
> > > The Raspberry Pi 4 gets its USB functionality from VL805, a PCIe chip
> > > that implements xHCI. After a PCI reset, VL805's firmware may either be
> > > loaded directly from an EEPROM or, if not present, by the SoC's
> > > co-processor, VideoCore. RPi4's VideoCore OS contains both the non public
> > > firmware load logic and the VL805 firmware blob. The function this patch
> > > introduces triggers the aforementioned process.
> > > 
> > > Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
> > > 
> > > ---
> > > 
> > > Change since v7:
> > > - Use usleep_delay()
> > > - Add comment about PCI errors
> > > - Don't wait on error
> > > - Typos
> > > 
> > > Change since v6:
> > > - Add test to avoid loading the firmware when not needed
> > > - Since we have it around, print VL805's firmware version, it'll make
> > > debugging easier in the future
> > > - Correct typos
> > > - Add a clearer view of HW topology in patch description
> > > 
> > > Changes since v4:
> > > - Inline function definition when RASPBERRYPI_FIRMWARE is not defined
> > > 
> > > Changes since v1:
> > > - Move include into .c file and add forward declaration to .h
> > > 
> > >  drivers/firmware/raspberrypi.c             | 61 ++++++++++++++++++++++
> > >  include/soc/bcm2835/raspberrypi-firmware.h |  7 +++
> > >  2 files changed, 68 insertions(+)
> > > 
> > Reviewed-by: Rob Herring <robh@...nel.org>
> 
> i modified the code a little bit for testing, but also successfully
> tested it without my modifications:
> 
> diff --git a/drivers/firmware/raspberrypi.c b/drivers/firmware/raspberrypi.c
> index 0d1422b..f3f4c2d 100644
> --- a/drivers/firmware/raspberrypi.c
> +++ b/drivers/firmware/raspberrypi.c
> @@ -337,8 +337,10 @@ int rpi_firmware_init_vl805(struct pci_dev *pdev)
>          * further down the line.
>          */
>         pci_read_config_dword(pdev, VL805_PCI_CONFIG_VERSION_OFFSET,
> &version);
> -       if (version)
> -               goto exit;
> +       if (version) {
> +               pci_info(pdev, "VL805 EEPROM firmware version %08x\n",
> version);
> +               return 0;
> +       }
>  
>         dev_addr = pdev->bus->number << 20 | PCI_SLOT(pdev->devfn) << 15 |
>                    PCI_FUNC(pdev->devfn) << 12;
> @@ -353,9 +355,8 @@ int rpi_firmware_init_vl805(struct pci_dev *pdev)
>  
>         pci_read_config_dword(pdev, VL805_PCI_CONFIG_VERSION_OFFSET,
>                               &version);
> -exit:
> -       pci_info(pdev, "VL805 firmware version %08x\n", version);
>  
> +       pci_info(pdev, "VL805 RAM firmware version %08x\n", version);
>         return 0;
>  }
>  EXPORT_SYMBOL_GPL(rpi_firmware_init_vl805);
> 
> Here are the my results with 3x Raspberry Pi 4:
> 
> VL805 EEPROM firmware version 000137ad
> VL805 EEPROM firmware version 00013701
> VL805 RAM firmware version 000137ad
> 
> So the whole patch series is:
> 
> Tested-by: Stefan Wahren <stefan.wahren@...e.com>

Thanks for taking the time!

Regards,
Nicolas


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