Messages in this thread | | | Date | Tue, 19 May 2015 09:18:37 -0300 | Subject | Re: [PATCH v2] serial: imx: Revert "initialized DMA w/o HW flow enabled" | From | Fabio Estevam <> |
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Hi Sebastian,
On Fri, May 8, 2015 at 4:13 AM, Sebastian Andrzej Siewior <sebastian@breakpoint.cc> wrote: > From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> > > This basically reverts commit 068500e08dc8 ("serial: imx: initialized > DMA w/o HW flow enabled") simply because it does not work. > I tested it on various IMX6 boards and the default SDMA firmware, that is > included in ROM, does not work properly. The SDMA interrupt counter does > not stop increment (which means the SDMA does not stop working) and I see > a lot of 0x00 (sometimes other bytes) which are added to the tty buffer > which are not part of the data transfer. > Jiada claimed that there is a firmware which makes it work but failed to > provide me a link to the firmware. All he said was that it can not be > shipped as part of the kernel due to license issues. I've found one > firmware in the FSL-tree but this firmware causes only TTY-overflows and > *no* data is transmitted. > > Currently I see no other way out.
Could you please test Philipp's patch? http://marc.info/?l=linux-serial&m=143202566332128&q=raw
It worked on my tests and DMA still works with his patch, so I would prefer his solution.
Thanks,
Fabio Estevam
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