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

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Date:   Thu, 7 May 2020 16:48:59 -0500
From:   Rob Herring <robh@...nel.org>
To:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Cc:     f.fainelli@...il.com, gregkh@...uxfoundation.org, wahrenst@....net,
        helgaas@...nel.org, linux-kernel@...r.kernel.org,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com, linux-pci@...r.kernel.org,
        tim.gover@...pberrypi.org, linux-usb@...r.kernel.org,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v8 2/4] firmware: raspberrypi: Introduce vl805 init
 routine

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>