From: Andy Shevchenko Date: Tue, 26 Apr 2016 09:03:05 +0000 (+0300) Subject: ata: sata_dwc_460ex: burst size must be in items not bytes X-Git-Tag: v4.7-rc1~74^2~20 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=4ea8c205e5fd1f7cac8f634347f842e12d8af9b4;p=linux.git ata: sata_dwc_460ex: burst size must be in items not bytes The burst size as defined by DMAengine API is in items of address width. Derive burst size from AHB_DMA_BRST_DFLT (64 bytes) by dividing it to DMA_SLAVE_BUSWIDTH_4_BYTES (4 bytes) that gives us 16 items. Tested-by: Christian Lamparter Signed-off-by: Andy Shevchenko Signed-off-by: Tejun Heo --- diff --git a/drivers/ata/sata_dwc_460ex.c b/drivers/ata/sata_dwc_460ex.c index aee887350fa3..4cac27de5163 100644 --- a/drivers/ata/sata_dwc_460ex.c +++ b/drivers/ata/sata_dwc_460ex.c @@ -65,7 +65,7 @@ #define NO_IRQ 0 #endif -#define AHB_DMA_BRST_DFLT 64 /* 16 data items burst length*/ +#define AHB_DMA_BRST_DFLT 64 /* 16 data items burst length */ enum { SATA_DWC_MAX_PORTS = 1, @@ -318,8 +318,8 @@ static struct dma_async_tx_descriptor *dma_dwc_xfer_setup(struct ata_queued_cmd } sconf.direction = qc->dma_dir; - sconf.src_maxburst = AHB_DMA_BRST_DFLT; - sconf.dst_maxburst = AHB_DMA_BRST_DFLT; + sconf.src_maxburst = AHB_DMA_BRST_DFLT / 4; /* in items */ + sconf.dst_maxburst = AHB_DMA_BRST_DFLT / 4; /* in items */ sconf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; sconf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;