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authorYu Zhao <yuzhao@google.com>2018-12-04 15:42:53 -0700
committerMark Brown <broonie@kernel.org>2018-12-06 12:55:28 +0000
commit23aa128bb28d9da69bb1bdb2b70e50128857884a (patch)
treec1d003495b880eae0a0e6cbf2f89d84d7658cdf8 /sound/soc/fsl/fsl-asoc-card.c
parentd6d08273996b3363178b920ccfa74acabaf67963 (diff)
ASoC: use dma_ops of parent device for acp_audio_dma
AMD platform device acp_audio_dma can only be created by parent PCI device driver (drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c). Pass struct device of the parent to snd_pcm_lib_preallocate_pages() so dma_alloc_coherent() can use correct dma_ops. Otherwise, it will use default dma_ops which is nommu_dma_ops on x86_64 even when IOMMU is enabled and set to non passthrough mode. Though platform device inherits some dma related fields during its creation in mfd_add_device(), we can't simply pass its struct device to snd_pcm_lib_preallocate_pages() because dma_ops is not among the inherited fields. Even it were, drivers/iommu/amd_iommu.c would ignore it because get_device_id() doesn't handle platform device. This change shouldn't give us any trouble even struct device of the parent becomes null or represents some non PCI device in the future, because get_dma_ops() correctly handles null struct device or uses the default dma_ops if struct device doesn't have it set. Signed-off-by: Yu Zhao <yuzhao@google.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound/soc/fsl/fsl-asoc-card.c')
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