From: Jon Medhurst Date: Fri, 7 Nov 2014 18:05:18 +0000 (+0000) Subject: dmaengine: pl330: Limit MFIFO usage for memcpy to avoid exhausting entries X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=c27f95568d1ed2573fc9c8848d741da63ca9a34e;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git 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 Signed-off-by: Vinod Koul --- diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c index 81505420bde4..e13b51a46502 100644 --- 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 */