From: Lucas Stach <l.stach@pengutronix.de>
To: Robin Gong <yibin.gong@nxp.com>,
"robh@kernel.org" <robh@kernel.org>,
"broonie@kernel.org" <broonie@kernel.org>,
"shawnguo@kernel.org" <shawnguo@kernel.org>,
"s.hauer@pengutronix.de" <s.hauer@pengutronix.de>,
"festevam@gmail.com" <festevam@gmail.com>,
"mark.rutland@arm.com" <mark.rutland@arm.com>,
"vkoul@kernel.org" <vkoul@kernel.org>,
"dan.j.williams@intel.com" <dan.j.williams@intel.com>,
"u.kleine-koenig@pengutronix.de" <u.kleine-koenig@pengutronix.de>,
"plyatov@gmail.com" <plyatov@gmail.com>,
"catalin.marinas@arm.com" <catalin.marinas@arm.com>
Cc: "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-spi@vger.kernel.org" <linux-spi@vger.kernel.org>,
dl-linux-imx <linux-imx@nxp.com>,
"kernel@pengutronix.de" <kernel@pengutronix.de>,
"dmaengine@vger.kernel.org" <dmaengine@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v4 00/14] add ecspi ERR009165 for i.mx6/7 soc family
Date: Wed, 22 May 2019 12:10:29 +0200 [thread overview]
Message-ID: <1558519829.2624.40.camel@pengutronix.de> (raw)
In-Reply-To: <1558548188-1155-1-git-send-email-yibin.gong@nxp.com>
Hi Robin,
Am Mittwoch, den 22.05.2019, 09:59 +0000 schrieb Robin Gong:
> 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
I haven't tested this so asking the obvious question: what happens when
this series is applied without the RAM script being present on the
system? Will it render SPI unusable? I guess so since it changes the
flow between the SPI core and DMA controller. Can we somehow detect
that SDMA isn't using the correct RAM script and fall back to PIO mode
in the SPI driver in that case?
Currently using the RAM script is not an option in a lot of use-cases,
as it still breaks serial DMA support. The fix for the serial issue
really needs to be remove the broken serial script from the RAM
firmware, not change the serial driver to deal with the broken behavior
introduced by the RAM script.
Regards,
Lucas
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prev parent reply other threads:[~2019-05-22 10:10 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-22 9:59 [PATCH v4 00/14] add ecspi ERR009165 for i.mx6/7 soc family Robin Gong
2019-05-22 9:59 ` [PATCH v4 01/14] Revert "ARM: dts: imx6q: Use correct SDMA script for SPI5 core" Robin Gong
2019-05-22 9:59 ` [PATCH v4 02/14] Revert "ARM: dts: imx6: Use correct SDMA script for SPI cores" Robin Gong
2019-05-22 9:59 ` [PATCH v4 03/14] Revert "dmaengine: imx-sdma: refine to load context only once" Robin Gong
2019-05-22 10:00 ` [PATCH v4 04/14] dmaengine: imx-sdma: remove dupilicated sdma_load_context Robin Gong
2019-05-22 10:00 ` [PATCH v4 05/14] dmaengine: imx-sdma: add mcu_2_ecspi script Robin Gong
2019-05-22 10:00 ` [PATCH v4 06/14] spi: imx: fix ERR009165 Robin Gong
2019-05-22 10:00 ` [PATCH v4 07/14] spi: imx: remove ERR009165 workaround on i.mx6ul Robin Gong
2019-05-22 10:00 ` [PATCH v4 08/14] spi: imx: add new i.mx6ul compatible name in binding doc Robin Gong
2019-05-22 10:00 ` [PATCH v4 09/14] dmaengine: imx-sdma: remove ERR009165 on i.mx6ul Robin Gong
2019-05-22 10:00 ` [PATCH v4 10/14] dma: imx-sdma: add i.mx6ul/6sx compatible name Robin Gong
2019-05-22 13:51 ` Rob Herring
2019-05-23 2:08 ` [EXT] " Robin Gong
2019-05-22 10:00 ` [PATCH v4 11/14] dmaengine: imx-sdma: fix ecspi1 rx dma not work on i.mx8mm Robin Gong
2019-05-23 5:34 ` Vinod Koul
2019-05-22 10:00 ` [PATCH v4 12/14] ARM: dts: imx6ul: add dma support on ecspi Robin Gong
2019-05-22 10:00 ` [PATCH v4 13/14] ARM: dts: imx6sll: correct sdma compatible Robin Gong
2019-05-22 10:01 ` [PATCH v4 14/14] arm64: defconfig: Enable SDMA on i.mx8mq/8mm Robin Gong
2019-05-22 10:10 ` Lucas Stach [this message]
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