Commit b4ba1c27 authored by Yu Zhao's avatar Yu Zhao Committed by Greg Kroah-Hartman

ASoC: use dma_ops of parent device for acp_audio_dma

[ Upstream commit 23aa128b ]

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: default avatarYu Zhao <yuzhao@google.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent e6256cb1
......@@ -1151,18 +1151,21 @@ static int acp_dma_new(struct snd_soc_pcm_runtime *rtd)
struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd,
DRV_NAME);
struct audio_drv_data *adata = dev_get_drvdata(component->dev);
struct device *parent = component->dev->parent;
switch (adata->asic_type) {
case CHIP_STONEY:
ret = snd_pcm_lib_preallocate_pages_for_all(rtd->pcm,
SNDRV_DMA_TYPE_DEV,
NULL, ST_MIN_BUFFER,
parent,
ST_MIN_BUFFER,
ST_MAX_BUFFER);
break;
default:
ret = snd_pcm_lib_preallocate_pages_for_all(rtd->pcm,
SNDRV_DMA_TYPE_DEV,
NULL, MIN_BUFFER,
parent,
MIN_BUFFER,
MAX_BUFFER);
break;
}
......
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