On Wed, Aug 02, 2017 at 09:54:40PM +0200, Sam Ravnborg wrote:
> Hi Uwe.
>
> On Wed, Aug 02, 2017 at 09:39:05PM +0200, Uwe Kleine-König wrote:
> > Hello,
> >
> > during bringup of an i.MX7 board I am faced with cspi_2_3_xchg_single not
> > returning. I don't know yet why this happens, but with this patch set it at least
> > doesn't block barebox.
>
> Your description reminded me of a similar issue we hit with SPI transfer.
> Back then Sascha fixed it but with some open question marks.
>
> See 9da7e18573c725eaa6123c401df57d6a4f6a0ea2
> ("spi: i.MX: reset controller on init")
>
> But as this is the latest patch to the imx_spi.c file you likely
> have already looked at it.
I havn't looked at it, but it is included in my barebox as I'm using
2017.08.0 + some patches.
Reading through the patch description, it doesn't match my situation.
I'm doing USB-Booting because when I made eMMC work all my available
remote hands already called it a day. So unless the boot ROM does
something strange (impossible!) barebox is the first spi user.
What seems to be similar is that TESTREG.TXCNT is != 0. For me this
smells clk-related. On i.MX6 I recently identified a problem (but didn't
come around yet to mainline a fix) that might match at least your
problem.
Can you still reproduce? How does your clk-tree look like (clk_dump)?
Thanks for your attention
Uwe
--
Pengutronix e.K. | Uwe Kleine-König |
Industrial Linux Solutions | http://www.pengutronix.de/ |
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