dmaengine: pl330: Limit MFIFO usage for memcpy to avoid exhausting entries

The MFIFO is shared by all channels so restrict each memcpy to it's fair
share. This is being over cautious, but without a global view of DMA
channel usage on a system it's not possible to come up with a more
optimum safe limit.

Signed-off-by: Jon Medhurst <tixy@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
index 81505420bde4dc817e347e10594029d6a7c23d56..e13b51a46502bc57820d1431f9f6cb512a5b9551 100644 (file)
--- a/drivers/dma/pl330.c
+++ b/drivers/dma/pl330.c
@@ -2336,7 +2336,7 @@ static inline int get_burst_len(struct dma_pl330_desc *desc, size_t len)
        int burst_len;
 
        burst_len = pl330->pcfg.data_bus_width / 8;
-       burst_len *= pl330->pcfg.data_buf_dep;
+       burst_len *= pl330->pcfg.data_buf_dep / pl330->pcfg.num_chan;
        burst_len >>= desc->rqcfg.brst_size;
 
        /* src/dst_burst_len can't be more than 16 */