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| author | Michael Ellerman <mpe@ellerman.id.au> | 2020-01-26 14:52:47 +0300 |
|---|---|---|
| committer | Rob Herring <robh@kernel.org> | 2020-01-28 17:26:20 +0300 |
| commit | dabf6b36b83a18d57e3d4b9d50544ed040d86255 (patch) | |
| tree | be02aaf9a02b27d300c787643a913c1a4ae0270d /drivers/of/Kconfig | |
| parent | 9243f296916794d86dfcabd802b4dac1ac1448a9 (diff) | |
| download | linux-dabf6b36b83a18d57e3d4b9d50544ed040d86255.tar.xz | |
of: Add OF_DMA_DEFAULT_COHERENT & select it on powerpc
There's an OF helper called of_dma_is_coherent(), which checks if a
device has a "dma-coherent" property to see if the device is coherent
for DMA.
But on some platforms devices are coherent by default, and on some
platforms it's not possible to update existing device trees to add the
"dma-coherent" property.
So add a Kconfig symbol to allow arch code to tell
of_dma_is_coherent() that devices are coherent by default, regardless
of the presence of the property.
Select that symbol on powerpc when NOT_COHERENT_CACHE is not set, ie.
when the system has a coherent cache.
Fixes: 92ea637edea3 ("of: introduce of_dma_is_coherent() helper")
Cc: stable@vger.kernel.org # v3.16+
Reported-by: Christian Zigotzky <chzigotzky@xenosoft.de>
Tested-by: Christian Zigotzky <chzigotzky@xenosoft.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Rob Herring <robh@kernel.org>
Diffstat (limited to 'drivers/of/Kconfig')
| -rw-r--r-- | drivers/of/Kconfig | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig index 37c2ccbefecd..d91618641be6 100644 --- a/drivers/of/Kconfig +++ b/drivers/of/Kconfig @@ -103,4 +103,8 @@ config OF_OVERLAY config OF_NUMA bool +config OF_DMA_DEFAULT_COHERENT + # arches should select this if DMA is coherent by default for OF devices + bool + endif # OF |