From: Sascha Hauer <s.hauer@pengutronix.de>
To: Barebox List <barebox@lists.infradead.org>
Subject: Re: [PATCH] ARM: i.MX: Disable OTG controller during startup
Date: Tue, 21 Aug 2018 09:02:56 +0200 [thread overview]
Message-ID: <20180821070256.4owzz75fhuumiaxl@pengutronix.de> (raw)
In-Reply-To: <20180816072116.2946-1-s.hauer@pengutronix.de>
On Thu, Aug 16, 2018 at 09:21:16AM +0200, Sascha Hauer wrote:
> When booting from USB it's sometimes observed that the USB stack on
> the remote host gets confused. This happens when we adjust the PLLs
> the USB controller is hanging on. The ROM just leaves the USB controller
> enabled when it passes control to the bootloader, so make sure we
> disable it before doing any critical clock operations.
>
> This is currently done for i.MX51, i.MX53 and i.MX6, but a similar thing
> can happen on other i.MXes aswell.
>
> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
I won't apply this one. With this patch we can't make sure that the
clocks for the USB controller are enabled. When they are not, the bus
accesses can hang the system. Checking if the clocks are turned on is
SoC specific, so this needs a bit more work.
Sascha
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prev parent reply other threads:[~2018-08-21 7:03 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-16 7:21 Sascha Hauer
2018-08-21 7:02 ` Sascha Hauer [this message]
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