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authorAddy Ke <addy.ke@rock-chips.com>2016-01-22 12:06:52 +0100
committerVinod Koul <vinod.koul@intel.com>2016-02-09 04:31:42 +0100
commit80abf8880cc6e1594c11b7c417f22dde60e25312 (patch)
tree60f88bf2b78f95530d3197854b3e2dd8f6ac8e06 /drivers/spi
parentdmaengine: pl330: add max burst for dmaengine (diff)
downloadlinux-80abf8880cc6e1594c11b7c417f22dde60e25312.tar.xz
linux-80abf8880cc6e1594c11b7c417f22dde60e25312.zip
spi: rockchip: modify DMA max burst to 1
Generic dma controller on Rockchips' platform cannot support DMAFLUSHP instruction which make dma to flush the req of non-aligned or non-multiple of what we need. That will cause an unrecoverable dma bus error. The saftest way is to set dma max burst to 1. Signed-off-by: Addy ke <addy.ke@rock-chips.com> Fixes: 64e36824b32b06 ("spi/rockchip: add driver for Rockchip...") Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com> cc: Heiko Stuebner <heiko@sntech.de> cc: Olof Johansson <olof@lixom.net> cc: Doug Anderson <dianders@chromium.org> cc: Sonny Rao <sonnyrao@chromium.org> Acked-by: Mark Brown <broonie@kernel.org> Signed-off-by: Caesar Wang <wxt@rock-chips.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/spi-rockchip.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c
index 79a8bc4f6cec..aa9561f586ab 100644
--- a/drivers/spi/spi-rockchip.c
+++ b/drivers/spi/spi-rockchip.c
@@ -199,6 +199,7 @@ struct rockchip_spi {
struct sg_table rx_sg;
struct rockchip_spi_dma_data dma_rx;
struct rockchip_spi_dma_data dma_tx;
+ struct dma_slave_caps dma_caps;
};
static inline void spi_enable_chip(struct rockchip_spi *rs, int enable)
@@ -449,7 +450,10 @@ static void rockchip_spi_prepare_dma(struct rockchip_spi *rs)
rxconf.direction = rs->dma_rx.direction;
rxconf.src_addr = rs->dma_rx.addr;
rxconf.src_addr_width = rs->n_bytes;
- rxconf.src_maxburst = rs->n_bytes;
+ if (rs->dma_caps.max_burst > 4)
+ rxconf.src_maxburst = 4;
+ else
+ rxconf.src_maxburst = 1;
dmaengine_slave_config(rs->dma_rx.ch, &rxconf);
rxdesc = dmaengine_prep_slave_sg(
@@ -466,7 +470,10 @@ static void rockchip_spi_prepare_dma(struct rockchip_spi *rs)
txconf.direction = rs->dma_tx.direction;
txconf.dst_addr = rs->dma_tx.addr;
txconf.dst_addr_width = rs->n_bytes;
- txconf.dst_maxburst = rs->n_bytes;
+ if (rs->dma_caps.max_burst > 4)
+ txconf.dst_maxburst = 4;
+ else
+ txconf.dst_maxburst = 1;
dmaengine_slave_config(rs->dma_tx.ch, &txconf);
txdesc = dmaengine_prep_slave_sg(
@@ -730,6 +737,7 @@ static int rockchip_spi_probe(struct platform_device *pdev)
}
if (rs->dma_tx.ch && rs->dma_rx.ch) {
+ dma_get_slave_caps(rs->dma_rx.ch, &(rs->dma_caps));
rs->dma_tx.addr = (dma_addr_t)(mem->start + ROCKCHIP_SPI_TXDR);
rs->dma_rx.addr = (dma_addr_t)(mem->start + ROCKCHIP_SPI_RXDR);
rs->dma_tx.direction = DMA_MEM_TO_DEV;