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When a memcpy request exceeds this limit, split it into multiple linked DMA descriptors to complete the transfer. Signed-off-by: Frank Li --- drivers/dma/ll-dma.c | 33 +++++++++++++++++++++++++++------ 1 file changed, 27 insertions(+), 6 deletions(-) diff --git a/drivers/dma/ll-dma.c b/drivers/dma/ll-dma.c index da13ba4dcdfe403af0ad3678bf4c0ff60f715a63..313ca274df945081fc569ddb6a1= 72298c25bc11c 100644 --- a/drivers/dma/ll-dma.c +++ b/drivers/dma/ll-dma.c @@ -17,6 +17,7 @@ */ #include #include +#include #include #include #include @@ -76,6 +77,15 @@ struct dma_ll_desc *vchan_dma_ll_alloc_desc(struct dma_c= han *chan, u32 n, goto err; =20 memset(desc->its[i].vaddr, 0, vchan->ll.size); + + if (!i) + continue; + + if (vchan->ll.ops->set_ll_next(desc, i - 1, + desc->its[i].paddr)) { + i++; /* Need free current one */ + goto err; + } } =20 return desc; @@ -107,21 +117,32 @@ vchan_dma_ll_prep_memcpy(struct dma_chan *chan, dma_addr_t dma_dst, dma_addr_t dma_src, size_t len, unsigned long flags) { + unsigned int max_seg =3D dma_get_max_seg_size(chan->device->dev); struct virt_dma_chan *vchan =3D to_virt_chan(chan); struct dma_ll_desc *desc; - int ret; + unsigned int ndesc; + int i, ret; =20 - desc =3D vchan_dma_ll_alloc_desc(chan, 1, flags); + ndesc =3D (len + max_seg - 1) / max_seg; + + desc =3D vchan_dma_ll_alloc_desc(chan, ndesc, flags); if (!desc) return NULL; =20 desc->iscyclic =3D false; =20 - ret =3D vchan->ll.ops->set_lli(desc, 0, dma_src, dma_dst, - len, true, NULL); + for (i =3D 0; i < ndesc; i++) { + ret =3D vchan->ll.ops->set_lli(desc, i, + dma_src, dma_dst, + min(len, max_seg), + i =3D=3D ndesc - 1, NULL); + if (ret) + goto err; =20 - if (ret) - goto err; + dma_src +=3D max_seg; + dma_dst +=3D max_seg; + len -=3D max_seg; + } =20 return __vchan_tx_prep(vchan, &desc->vdesc); =20 --=20 2.34.1