linux-kernel - RE: mmc: host: sdhci-esdhc-imx: async sdio interrupt and hardware auto-tuning

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Date:   Thu, 3 Nov 2022 02:32:12 +0000
From:   Bough Chen <haibo.chen@....com>
To:     Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     dl-linux-imx <linux-imx@....com>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "ulf.hansson@...aro.org" <ulf.hansson@...aro.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "adrian.hunter@...el.com" <adrian.hunter@...el.com>,
        "festevam@...il.com" <festevam@...il.com>
Subject: RE: mmc: host: sdhci-esdhc-imx: async sdio interrupt and hardware
 auto-tuning

> -----Original Message-----
> From: Marcel Ziswiler <marcel.ziswiler@...adex.com>
> Sent: 2022年11月3日 4:43
> To: linux-arm-kernel@...ts.infradead.org; linux-mmc@...r.kernel.org;
> linux-kernel@...r.kernel.org
> Cc: dl-linux-imx <linux-imx@....com>; kernel@...gutronix.de;
> s.hauer@...gutronix.de; Bough Chen <haibo.chen@....com>;
> ulf.hansson@...aro.org; shawnguo@...nel.org; adrian.hunter@...el.com;
> festevam@...il.com
> Subject: mmc: host: sdhci-esdhc-imx: async sdio interrupt and hardware
> auto-tuning
> 
> Hi there
> 
> When we investigated an SDIO Wi-Fi stability issue I discovered the following
> downstream-only commit in NXP's latest downstream BSP
> 5.15.52_2.1.0 [1]. The asynchronous SDIO interrupt seems to adversly affect the
> hardware auto-tuning. As a workaround what got implemented is an fsl-custom
> device tree property that limits the auto-tuning to
> 1 bit only (e.g. on DAT[0]) while the SDIO interrupt stays on DAT[1].
> 
> Does anybody know any further details about this?
> 
> Would this be a reasonable thing to also implement upstream?

Hi Marcel,

I send these patches to community few month ago, get some comments related to dts part. 
I will continue to do the upstream work for these patches.

Best Regards
Haibo Chen
> 
> Unfortunately, so far we have not really done any extensive SDIO validation
> using upstream but I plan to set something like that up so we may see whether
> or not we are also hitting such issue.
> 
> Thanks!
> 
> [1]
> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.co
> m%2Fnxp-imx%2Flinux-imx%2Fcommit%2F84c529a1474a9f6614e475e178ca5fe
> 23b6177de&amp;data=05%7C01%7Chaibo.chen%40nxp.com%7C5b75121c05a
> d48c362d708dabd12e507%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0
> %7C638030186093684545%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAw
> MDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7
> C&amp;sdata=PX17UiGkQHfMxHd9Sf2jEbIsZgWO5MCp5pF%2BIDXQIn4%3D&a
> mp;reserved=0
> 
> Cheers
> 
> Marcel