Commit 6f7cc98b authored by Addy Ke's avatar Addy Ke Committed by Kamal Mostafa

spi: rockchip: modify DMA max burst to 1

commit 80abf888 upstream.

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: default avatarAddy ke <addy.ke@rock-chips.com>
Fixes: 64e36824 ("spi/rockchip: add driver for Rockchip...")
Signed-off-by: default avatarShawn 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: default avatarMark Brown <broonie@kernel.org>
Signed-off-by: default avatarCaesar Wang <wxt@rock-chips.com>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
Signed-off-by: default avatarKamal Mostafa <kamal@canonical.com>
parent 17e44975
......@@ -198,6 +198,7 @@ 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)
......@@ -441,7 +442,10 @@ 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(
......@@ -457,7 +461,10 @@ 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(
......@@ -701,6 +708,7 @@ 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;
......
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