We shouldn't assume CPU physical address we get from page_to_phys() is same as DMA address we get from dma_alloc_coherent(). On x86_64, we won't run into any problem with the assumption when dma_ops is nommu_dma_ops. However, DMA address is IOVA when IOMMU is enabled. And it's most likely different from CPU physical address when AMD IOMMU is not in passthrough mode.
Signed-off-by: Vijendar Mukunda <[email protected]> Tested-by: RAVULAPATI VISHNU VARDHAN RAO <[email protected]> --- sound/soc/amd/raven/acp3x-pcm-dma.c | 23 +++++++++++------------ 1 file changed, 11 insertions(+), 12 deletions(-) diff --git a/sound/soc/amd/raven/acp3x-pcm-dma.c b/sound/soc/amd/raven/acp3x-pcm-dma.c index a4ade6b..49c4872 100644 --- a/sound/soc/amd/raven/acp3x-pcm-dma.c +++ b/sound/soc/amd/raven/acp3x-pcm-dma.c @@ -31,7 +31,7 @@ struct i2s_stream_instance { u16 num_pages; u16 channels; u32 xfer_resolution; - struct page *pg; + dma_addr_t dma_addr; u64 bytescount; void __iomem *acp3x_base; }; @@ -211,11 +211,13 @@ static irqreturn_t i2s_irq_handler(int irq, void *dev_id) static void config_acp3x_dma(struct i2s_stream_instance *rtd, int direction) { u16 page_idx; - u64 addr; + dma_addr_t addr; u32 low, high, val, acp_fifo_addr; - struct page *pg = rtd->pg; - /* 8 scratch registers used to map one 64 bit address */ + addr = rtd->dma_addr; + /* 8 scratch registers used to map one 64 bit address. + * For 2 pages (8192 * 2 bytes), it will be 16 registers. + */ if (direction == SNDRV_PCM_STREAM_PLAYBACK) val = 0; else @@ -229,7 +231,6 @@ static void config_acp3x_dma(struct i2s_stream_instance *rtd, int direction) for (page_idx = 0; page_idx < rtd->num_pages; page_idx++) { /* Load the low address of page int ACP SRAM through SRBM */ - addr = page_to_phys(pg); low = lower_32_bits(addr); high = upper_32_bits(addr); @@ -239,7 +240,7 @@ static void config_acp3x_dma(struct i2s_stream_instance *rtd, int direction) + 4); /* Move to next physically contiguos page */ val += 8; - pg++; + addr += PAGE_SIZE; } if (direction == SNDRV_PCM_STREAM_PLAYBACK) { @@ -340,10 +341,8 @@ static int acp3x_dma_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params) { int status; - u64 size; - struct page *pg; - struct snd_pcm_runtime *runtime = substream->runtime; - struct i2s_stream_instance *rtd = runtime->private_data; + uint64_t size; + struct i2s_stream_instance *rtd = substream->runtime->private_data; if (!rtd) return -EINVAL; @@ -355,8 +354,8 @@ static int acp3x_dma_hw_params(struct snd_pcm_substream *substream, memset(substream->runtime->dma_area, 0, params_buffer_bytes(params)); pg = virt_to_page(substream->dma_buffer.area); - if (pg) { - rtd->pg = pg; + if (substream->dma_buffer.area) { + rtd->dma_addr = substream->dma_buffer.addr; rtd->num_pages = (PAGE_ALIGN(size) >> PAGE_SHIFT); config_acp3x_dma(rtd, substream->stream); status = 0; -- 2.7.4
