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

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Message-ID: <b3da27d4-a6ab-894f-2fac-f3cbe57dfdfb@i2se.com>
Date:   Sat, 9 May 2020 12:09:40 +0200
From:   Stefan Wahren <stefan.wahren@...e.com>
To:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
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

Am 09.05.20 um 12:02 schrieb Stefan Wahren:
> 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>
>
Sorry, for sending from the wrong address:

Tested-by: Stefan Wahren <stefan.wahren@...e.com>