linux-kernel - Re: [PATCH] Revert "dma-contiguous: do not allocate a single page from CMA area"

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Date:   Wed, 27 Feb 2019 14:04:25 +0000
From:   Jon Hunter <jonathanh@...dia.com>
To:     Nicolin Chen <nicoleotsuka@...il.com>, <hch@....de>,
        <m.szyprowski@...sung.com>, <robin.murphy@....com>,
        <tony@...mide.com>
CC:     <vdumpa@...dia.com>, <iommu@...ts.linux-foundation.org>,
        <linux-kernel@...r.kernel.org>, <tomi.valkeinen@...com>,
        <laurent.pinchart@...asonboard.com>, <sre@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-omap@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        linux-tegra <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH] Revert "dma-contiguous: do not allocate a single page
 from CMA area"


On 26/02/2019 20:23, Nicolin Chen wrote:
> This reverts commit d222e42e88168fd67e6d131984b86477af1fc256.
> 
> The original change breaks omap dss:
>     omapdss_dispc 58001000.dispc:
>         dispc_errata_i734_wa_init: dma_alloc_writecombine failed
> 
> Let's revert it first and then find a safer solution instead.
> 
> Reported-by: Tony Lindgren <tony@...mide.com>
> Signed-off-by: Nicolin Chen <nicoleotsuka@...il.com>
> ---
> Tony,
> 	
> Would you please test and verify? Thanks!

This also fixes various memory allocation failures we have seen on
32-bit Tegra as well.

Tested-by: Jon Hunter <jonathanh@...dia.com>

Cheers
Jon

-- 
nvpublic