linux-kernel - Re: [PATCH v7 00/13] add ecspi ERR009165 for i.mx6/7 soc family

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Message-ID: <CANh8QzwanSewjJ98HL_yR1juiHo1RN77JQyNNKrMrud3B0dnww@mail.gmail.com>
Date:   Wed, 15 Apr 2020 11:47:11 +0200
From:   "Fuzzey, Martin" <martin.fuzzey@...wbird.group>
To:     Robin Gong <yibin.gong@....com>
Cc:     Sascha Hauer <s.hauer@...gutronix.de>, vkoul@...nel.org,
        Shawn Guo <shawnguo@...nel.org>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Fabio Estevam <festevam@...il.com>, dan.j.williams@...el.com,
        mark.rutland@....com, catalin.marinas@....com,
        Will Deacon <will.deacon@....com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Sascha Hauer <kernel@...gutronix.de>,
        linux-spi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        "Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>, dmaengine@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v7 00/13] add ecspi ERR009165 for i.mx6/7 soc family

Hi Robin,


On Wed, 11 Mar 2020 at 09:35, Robin Gong <yibin.gong@....com> wrote:
>
> There is ecspi ERR009165 on i.mx6/7 soc family, which cause FIFO
> transfer to be send twice in DMA mode. Please get more information from:
> https://www.nxp.com/docs/en/errata/IMX6DQCE.pdf. The workaround is adding
> new sdma ram script which works in XCH  mode as PIO inside sdma instead
> of SMC mode, meanwhile, 'TX_THRESHOLD' should be 0. The issue should be
> exist on all legacy i.mx6/7 soc family before i.mx6ul.
> NXP fix this design issue from i.mx6ul, so newer chips including i.mx6ul/
> 6ull/6sll do not need this workaroud anymore. All other i.mx6/7/8 chips
> still need this workaroud. This patch set add new 'fsl,imx6ul-ecspi'
> for ecspi driver and 'ecspi_fixed' in sdma driver to choose if need errata
> or not.
> The first two reverted patches should be the same issue, though, it
> seems 'fixed' by changing to other shp script. Hope Sean or Sascha could
> have the chance to test this patch set if could fix their issues.
> Besides, enable sdma support for i.mx8mm/8mq and fix ecspi1 not work
> on i.mx8mm because the event id is zero.
>
> PS:
>    Please get sdma firmware from below linux-firmware and copy it to your
> local rootfs /lib/firmware/imx/sdma.
> https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/tree/imx/sdma
>

A couple of questions

1) Is this series needed for the i.MX6DL? (the document you linked
only seems to mention i.MX6D/Q
2) If the laterst SDMA firmware mentionned above is used will this
break systems running mainline kernels without this patch series
applied?

Regards,

Martin