From: Stefan Wahren <[email protected]> Similar to the info generation, generate the final extra info with a separate function. This is necessary to introduce other platforms with different info bits.
Signed-off-by: Stefan Wahren <[email protected]> Signed-off-by: Dave Stevenson <[email protected]> --- drivers/dma/bcm2835-dma.c | 34 ++++++++++++++++++++++++++++------ 1 file changed, 28 insertions(+), 6 deletions(-) diff --git a/drivers/dma/bcm2835-dma.c b/drivers/dma/bcm2835-dma.c index 7cef7ff89575..ef452ebb3c15 100644 --- a/drivers/dma/bcm2835-dma.c +++ b/drivers/dma/bcm2835-dma.c @@ -229,6 +229,29 @@ static u32 bcm2835_dma_prepare_cb_info(struct bcm2835_chan *c, return result; } +static u32 bcm2835_dma_prepare_cb_extra(struct bcm2835_chan *c, + enum dma_transfer_direction direction, + bool cyclic, bool final, + unsigned long flags) +{ + u32 result = 0; + + if (cyclic) { + if (flags & DMA_PREP_INTERRUPT) + result |= BCM2835_DMA_INT_EN; + } else { + if (!final) + return 0; + + result |= BCM2835_DMA_INT_EN; + + if (direction == DMA_MEM_TO_MEM) + result |= BCM2835_DMA_WAIT_RESP; + } + + return result; +} + static void bcm2835_dma_free_cb_chain(struct bcm2835_desc *desc) { size_t i; @@ -644,7 +667,8 @@ static struct dma_async_tx_descriptor *bcm2835_dma_prep_dma_memcpy( struct bcm2835_chan *c = to_bcm2835_dma_chan(chan); struct bcm2835_desc *d; u32 info = bcm2835_dma_prepare_cb_info(c, DMA_MEM_TO_MEM, false); - u32 extra = BCM2835_DMA_INT_EN | BCM2835_DMA_WAIT_RESP; + u32 extra = bcm2835_dma_prepare_cb_extra(c, DMA_MEM_TO_MEM, false, + true, 0); size_t max_len = bcm2835_dma_max_frame_length(c); size_t frames; @@ -675,7 +699,7 @@ static struct dma_async_tx_descriptor *bcm2835_dma_prep_slave_sg( struct bcm2835_desc *d; dma_addr_t src = 0, dst = 0; u32 info = bcm2835_dma_prepare_cb_info(c, direction, false); - u32 extra = BCM2835_DMA_INT_EN; + u32 extra = bcm2835_dma_prepare_cb_extra(c, direction, false, true, 0); size_t frames; if (!is_slave_direction(direction)) { @@ -723,7 +747,7 @@ static struct dma_async_tx_descriptor *bcm2835_dma_prep_dma_cyclic( dma_addr_t src, dst; u32 info = bcm2835_dma_prepare_cb_info(c, direction, buf_addr == od->zero_page); - u32 extra = 0; + u32 extra = bcm2835_dma_prepare_cb_extra(c, direction, true, true, 0); size_t max_len = bcm2835_dma_max_frame_length(c); size_t frames; @@ -739,9 +763,7 @@ static struct dma_async_tx_descriptor *bcm2835_dma_prep_dma_cyclic( return NULL; } - if (flags & DMA_PREP_INTERRUPT) - extra |= BCM2835_DMA_INT_EN; - else + if (!(flags & DMA_PREP_INTERRUPT)) period_len = buf_len; /* -- 2.34.1
