diff options
| author | Michael Ellerman <mpe@ellerman.id.au> | 2020-01-26 22:52:47 +1100 |
|---|---|---|
| committer | Jason Liu <jason.hui.liu@nxp.com> | 2020-02-26 04:17:46 +0800 |
| commit | 6446af3feb023b462636026f6e1b905a22c33ea8 (patch) | |
| tree | 4895621a5bcc8bf23753c0dc590c57142620ec5a /arch/powerpc | |
| parent | 68430e200e6de56731e5acc8c85d6e987a13db72 (diff) | |
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>
(cherry picked from commit dabf6b36b83a18d57e3d4b9d50544ed040d86255)
(cherry picked from commit 43557841be9fbf4dc9e053944a2e896c4baea73b)
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 2a70433b6f9d..fd05ff4dd41c 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -237,6 +237,7 @@ config PPC select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE select NEED_SG_DMA_LENGTH select OF + select OF_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE select OF_EARLY_FLATTREE select OLD_SIGACTION if PPC32 select OLD_SIGSUSPEND |