linux-kernel - Re: [PATCH] dmaengine: ti: omap-dma: Configure LCH

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Date:   Fri, 23 Nov 2018 13:49:26 +0200
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     Russell King - ARM Linux <linux@...linux.org.uk>,
        Aaro Koskinen <aaro.koskinen@....fi>
CC:     <vkoul@...nel.org>, <dan.j.williams@...el.com>,
        <dmaengine@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <tony@...mide.com>, <linux-omap@...r.kernel.org>
Subject: Re: [PATCH] dmaengine: ti: omap-dma: Configure LCH_TYPE for OMAP1



On 22/11/2018 12.29, Russell King - ARM Linux wrote:
> On Tue, Nov 20, 2018 at 11:04:06PM +0200, Aaro Koskinen wrote:
>> I had switched to PIO mode in 2015 since the WARNs about legacy DMA
>> API were too annoying and flooding the console. And now that I tried
>> using DMA again with g_ether, it doesn't work anymore. The device get's
>> recognized on host side, but no traffic goes through. Switching back to
>> PIO makes it to work again.
> 
> A solution to that would be to do what the warning message says, and
> update the driver to the DMAengine API.

Yep, omap_udc is the last user of legacy omap_dma API. It is a slow
progress as I do the conversion in my free time, onenand/omap2 and tusb
was converted not too long ago, let's see how the omap_udc is going to go.

> The reason it didn't get updated when the DMAengine conversion happened
> is because I don't have hardware for it, so had no way to test, and no
> one seemed to know that anyone was using it.  Eventually, the WARN_ON()
> was added to try and root out any users and generate interest in
> updating the drivers.  Obviously that didn't happen, because people
> just worked around the warning rather than saying anything.
> 
> I'm afraid we're long past the time that I'd be willing to update the
> omap_udc driver now as I've dropped most of my knowledge on that as
> it's been four years, and Peter has been looking after OMAP DMAengine
> issues since.
> 
> Sorry.
> 

- Péter

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