linux-kernel - Re: [PATCH 0/2] omap: dsp: make the driver actually work

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Date:	Wed, 6 Oct 2010 00:05:44 +0300
From:	Felipe Contreras <felipe.contreras@...il.com>
To:	"Ramirez Luna, Omar" <omar.ramirez@...com>
Cc:	Greg KH <greg@...ah.com>, linux-omap <linux-omap@...r.kernel.org>,
	linux-main <linux-kernel@...r.kernel.org>,
	Ohad Ben-Cohen <ohad@...ery.com>,
	Tony Lindgren <tony@...mide.com>,
	Hiroshi Doyu <hiroshi.doyu@...ia.com>
Subject: Re: [PATCH 0/2] omap: dsp: make the driver actually work

On Tue, Oct 5, 2010 at 11:09 PM, Ramirez Luna, Omar <omar.ramirez@...com> wrote:
> Felipe Contreras wrote:
> ...
>>>
>>> phys_to_virt instead of ioremap should work fine, still need to try
>>> it though.
>>
>> I tried that... Didn't work. I guess we need to flush at some points
>> (since the memory is cacheable).
>
> Hmmm, because my other option was to move the reserved memory outside the kernel, but that involves specifying bootargs again and using dma_alloc_coherent with their restrictions.

Huh, if there's no contiguous memory region reserved, then the driver
is doing dma_alloc_coherent already, but that fails (apparently 5M is
too much). Plus I've read that dma_alloc_coherent is "precious";
shouldn't be used for that.

> If you are working on a different method and need any help let me know.

So, first I wanted to try reserving some region with mem=X boot param,
but that solution is ugly. If that worked, then I wanted ti see if
flushing each time we access that shm memory block works, but in the
process I wanted to reorganize the whole initialization code because
right now it's very ugly and confusing.

-- 
Felipe Contreras
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