From: Fabio Estevam <festevam@gmail.com>
To: Lucas Stach <l.stach@pengutronix.de>
Cc: "BOUGH CHEN" <haibo.chen@nxp.com>,
"Angus Ainslie" <angus@akkea.ca>,
"Leonard Crestez" <leonard.crestez@nxp.com>,
"Peng Fan" <peng.fan@nxp.com>, "Abel Vesa" <abel.vesa@nxp.com>,
"Stephen Boyd" <sboyd@kernel.org>,
"Michael Turquette" <mturquette@baylibre.com>,
"Ulf Hansson" <ulf.hansson@linaro.org>,
"Guido Günther" <agx@sigxcpu.org>,
linux-mmc <linux-mmc@vger.kernel.org>,
"Adrian Hunter" <adrian.hunter@intel.com>,
dl-linux-imx <linux-imx@nxp.com>,
"Sascha Hauer" <kernel@pengutronix.de>,
"moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: sdhci timeout on imx8mq
Date: Wed, 6 Jan 2021 15:56:43 -0300 [thread overview]
Message-ID: <CAOMZO5BzAw8CjvaOzH_Ynr2eapO1MViTOWN5yZ5i_BcAhv3tWA@mail.gmail.com> (raw)
In-Reply-To: <cd99776c0107833d69c9c7fc4c8d6ba1a41ea3d7.camel@pengutronix.de>
Hi Lucas,
On Tue, Jan 5, 2021 at 12:06 PM Lucas Stach <l.stach@pengutronix.de> wrote:
> The reference manual states about this situation: "For any clock, its
> source must be left on when it is kept on. Behavior is undefined if
> this rule is violated."
> And it seems this is exactly what's happening here: some kind of glitch
> is introduced in the nand_usdhc_bus clock, which prevents the SDHCI
> controller from working, even though the clock branch is properly
> enabled later on. On my system the SDHCI timeout and following runtime
> suspend/resume cycle on the nand_usdhc_bus clock seem to get it back
> into a working state.
I think your analysis is correct and I recall helping a customer with
a similar issue:
https://community.nxp.com/t5/i-MX-Processors/External-clock-that-provide-root-clock-for-SAI3-and-SPDIF/m-p/1019834
Regards,
Fabio Estevam
next prev parent reply other threads:[~2021-01-06 18:57 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-03 19:19 sdhci timeout on imx8mq Fabio Estevam
2020-02-05 9:26 ` Guido Günther
2020-02-05 13:18 ` Fabio Estevam
2020-02-07 2:11 ` BOUGH CHEN
[not found] ` <VI1PR04MB504091C7991353F6092A8D91901A0@VI1PR04MB5040.eurprd04.prod.outlook.com>
2020-02-13 10:53 ` Fabio Estevam
2020-06-30 19:39 ` Angus Ainslie
2020-07-07 12:44 ` Fabio Estevam
2020-07-08 1:32 ` BOUGH CHEN
2020-12-18 20:07 ` Lucas Stach
2020-12-18 20:45 ` Angus Ainslie
2020-12-23 21:06 ` Angus Ainslie
2021-01-05 15:06 ` Lucas Stach
2021-01-06 9:29 ` Bough Chen
2021-01-06 15:09 ` Lucas Stach
2021-01-07 1:47 ` Bough Chen
2021-01-06 18:56 ` Fabio Estevam [this message]
2021-01-07 1:30 ` Jacky Bai
2021-01-07 11:26 ` Lucas Stach
2021-01-08 1:27 ` Jacky Bai
2021-03-09 7:35 ` Heiko Thiery
2021-01-19 2:35 ` Peng Fan
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CAOMZO5BzAw8CjvaOzH_Ynr2eapO1MViTOWN5yZ5i_BcAhv3tWA@mail.gmail.com \
--to=festevam@gmail.com \
--cc=abel.vesa@nxp.com \
--cc=adrian.hunter@intel.com \
--cc=agx@sigxcpu.org \
--cc=angus@akkea.ca \
--cc=haibo.chen@nxp.com \
--cc=kernel@pengutronix.de \
--cc=l.stach@pengutronix.de \
--cc=leonard.crestez@nxp.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-imx@nxp.com \
--cc=linux-mmc@vger.kernel.org \
--cc=mturquette@baylibre.com \
--cc=peng.fan@nxp.com \
--cc=sboyd@kernel.org \
--cc=ulf.hansson@linaro.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).