* Regression in Linux next with dma cma changes
@ 2019-02-26 20:01 Tony Lindgren
2019-02-26 20:15 ` Nicolin Chen
0 siblings, 1 reply; 2+ messages in thread
From: Tony Lindgren @ 2019-02-26 20:01 UTC (permalink / raw)
To: Nicolin Chen, Christoph Hellwig
Cc: linux-kernel, dri-devel, Sebastian Reichel, Tomi Valkeinen,
Laurent Pinchart, linux-omap, linux-arm-kernel, Marek Szyprowski
Hi,
Looks like commit d222e42e8816 ("dma-contiguous: do not allocate a
single page from CMA area") caused a regression at least for
omap dss where we now get the following error on init:
omapdss_dispc 58001000.dispc:
dispc_errata_i734_wa_init: dma_alloc_writecombine failed
Any ideas what might be going wrong?
Regards,
Tony
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* Re: Regression in Linux next with dma cma changes
2019-02-26 20:01 Regression in Linux next with dma cma changes Tony Lindgren
@ 2019-02-26 20:15 ` Nicolin Chen
0 siblings, 0 replies; 2+ messages in thread
From: Nicolin Chen @ 2019-02-26 20:15 UTC (permalink / raw)
To: Tony Lindgren
Cc: linux-kernel, dri-devel, Sebastian Reichel, Tomi Valkeinen,
Laurent Pinchart, linux-omap, Christoph Hellwig,
linux-arm-kernel, Marek Szyprowski
On Tue, Feb 26, 2019 at 12:01:55PM -0800, Tony Lindgren wrote:
> Looks like commit d222e42e8816 ("dma-contiguous: do not allocate a
> single page from CMA area") caused a regression at least for
> omap dss where we now get the following error on init:
>
> omapdss_dispc 58001000.dispc:
> dispc_errata_i734_wa_init: dma_alloc_writecombine failed
>
> Any ideas what might be going wrong?
It's probably because the dma_alloc_from_contiguous() call in
this path doesn't rebound to allocate a normal single page.
And I guess we should have left the change within dma-direct.
Christoph, do you agree?
I am submitting a revert first.
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2019-02-26 20:01 Regression in Linux next with dma cma changes Tony Lindgren
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