[PATCH] ARM: mvebu: select OF_DMA_DEFAULT_COHERENT if MACH_MVEBU_V7

[Thorsten Leemhuis]

On 04.10.22 10:17, Marek Behún wrote:
> Commit ae626eb97376 ("ARM/dma-mapping: use dma-direct unconditionally")
> caused a regression on the mvebu platform, wherein devices that are
> dma-coherent are marked as dma-noncoherent, because although
> mvebu_hwcc_notifier() after that commit still marks then as coherent,
> the arm_coherent_dma_ops() function, which is called later, overwrites
> this setting, since it is being called from drivers/of/device.c with
> coherency parameter determined by of_dma_is_coherent(), and the
> device-trees do not declare the 'dma-coherent' property.
> 
> Fix this by defaulting to dma-coherent for this platform in the
> of_dma_is_coherent() function, if neither dma-coherent nor
> dma-noncoherent is declared.
> 
> Fixes: ae626eb97376 ("ARM/dma-mapping: use dma-direct unconditionally")
> Link: https://lore.kernel.org/linux-arm-kernel/20220930151028.0e518421@dellmb/

Thx for taking care of this. One quick note: You might want to add a
"Cc: stable at ..." on the patch to ensure it's backported in a timely manner:
https://lore.kernel.org/lkml/YwZmu1ZTbjVqIY%2FC@kroah.com/

Ciao, Thorsten