linux-kernel - Re: [PATCH v2 0/7] PolarFire SoC Auto Update Support

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Date:   Sun, 02 Apr 2023 09:23:03 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Xu Yilun <yilun.xu@...el.com>,
        Conor Dooley <conor.dooley@...rochip.com>
CC:     linux-fpga@...r.kernel.org,
        Daire McNamara <daire.mcnamara@...rochip.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Moritz Fischer <mdf@...nel.org>, Wu Hao <hao.wu@...el.com>,
        Tom Rix <trix@...hat.com>, linux-riscv@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/7] PolarFire SoC Auto Update Support



On 2 April 2023 09:00:34 IST, Xu Yilun <yilun.xu@...el.com> wrote:
>On 2023-03-31 at 08:18:16 +0100, Conor Dooley wrote:
>> Hey all,
>> 
>> This patchset adds support for the "Auto Update" feature on PolarFire
>> SoC that allows for writing an FPGA bistream to the SPI flash connected
>> to the system controller.
>> On powercycle (or reboot depending on how the firmware implements the
>> openSBI SRST extension) "Auto Update" will take place, and program the
>> FPGA with the contents of the SPI flash - provided that that image is
>> valid and an actual upgrade from that already programmed!
>> 
>> Unfortunately, this series is not really testable yet - the Engineering
>> Sample silicon on most dev boards has a bug in the QSPI controller
>> connected to the system controller's flash and cannot access it.
>> Pre-production and later silicon has this bug fixed.
>> 
>> I previously posted an RFC about my approach in this driver, since as a
>> flash-based FPGA we are somewhat different to the existing
>> self-reprogramming drivers here. That RFC is here:
>> https://lore.kernel.org/linux-fpga/20221121225748.124900-1-conor@kernel.org/
>> 
>> This series depends on the following fixes:
>> https://lore.kernel.org/all/d7c3ec51-8493-444a-bdec-2a30b0a15bdc@spud/
>
>Is that series already merged? If yes, just remove this line.
>If no, either put all of them in one series, or still make this series
>as RFC until the dependency is resolved.

Merged into what?
I'll be applying the dependencies tomorrow probably.

>
>Thanks,
>Yilun
>
>> 
>> The patch adding the driver depends on the soc patches earlier in the
>> series, so taking both through the same tree makes sense. Depending on
>> sequencing with the dependencies, me taking it through the soc tree
>> (with Acks etc of course) may make the most sense.
>> 
>> Cheers,
>> Conor.
>> 
>> Changes in v2:
>> - per Russ' suggestion, the driver has been switched to using the
>>   firmware-upload API rather than the fpga one
>> - as a result of that change, the structure of the driver has changed
>>   significantly, although most of that is reshuffling existing code
>>   around
>> - check if the upgrade is possible in probe and fail if it isn't
>> - only write the image index if it is not already set
>> - delete the now unneeded debugfs bits
>> 
>> CC: Conor Dooley <conor.dooley@...rochip.com>
>> CC: Daire McNamara <daire.mcnamara@...rochip.com>
>> CC: Rob Herring <robh+dt@...nel.org>
>> CC: Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
>> CC: Moritz Fischer <mdf@...nel.org>
>> CC: Wu Hao <hao.wu@...el.com>
>> CC: Xu Yilun <yilun.xu@...el.com>
>> CC: Tom Rix <trix@...hat.com>
>> CC; Russ Weight <russell.h.weight@...el.com>
>> CC: linux-riscv@...ts.infradead.org
>> CC: devicetree@...r.kernel.org
>> CC: linux-kernel@...r.kernel.org
>> CC: linux-fpga@...r.kernel.org
>> 
>> Conor Dooley (7):
>>   soc: microchip: mpfs: add a prefix to rx_callback()
>>   dt-bindings: soc: microchip: add a property for system controller
>>     flash
>>   soc: microchip: mpfs: enable access to the system controller's flash
>>   soc: microchip: mpfs: print service status in warning message
>>   soc: microchip: mpfs: add auto-update subdev to system controller
>>   fpga: add PolarFire SoC Auto Update support
>>   riscv: dts: microchip: add the mpfs' system controller qspi &
>>     associated flash
>> 
>>  .../microchip,mpfs-sys-controller.yaml        |  10 +
>>  .../boot/dts/microchip/mpfs-icicle-kit.dts    |  21 +
>>  arch/riscv/boot/dts/microchip/mpfs.dtsi       |  24 +-
>>  drivers/fpga/Kconfig                          |  11 +
>>  drivers/fpga/Makefile                         |   3 +-
>>  drivers/fpga/microchip-auto-update.c          | 494 ++++++++++++++++++
>>  drivers/soc/microchip/Kconfig                 |   1 +
>>  drivers/soc/microchip/mpfs-sys-controller.c   |  37 +-
>>  include/soc/microchip/mpfs.h                  |   2 +
>>  9 files changed, 591 insertions(+), 12 deletions(-)
>>  create mode 100644 drivers/fpga/microchip-auto-update.c
>> 
>> -- 
>> 2.39.2
>>