diff options
| author |   Huibin Hong <huibin.hong@rock-chips.com> | 2018-10-10 11:00:33 +0200 |
|---|---|---|
| committer |   Mark Brown <broonie@kernel.org> | 2018-10-11 15:14:37 +0100 |
| commit | dcfc861d24ec19f0d0d3d55bb016646794571fbb (patch) | |
| tree | 8d319d40fe8cf3835e3ae40f3a93f1be32b82093 /drivers/spi | |
| parent | spi: Introduce new driver for Qualcomm QuadSPI controller (diff) | |
| download | linux-dev-dcfc861d24ec19f0d0d3d55bb016646794571fbb.tar.xz linux-dev-dcfc861d24ec19f0d0d3d55bb016646794571fbb.zip | |
spi: rockchip: adjust dma watermark and burstlen
Signal tx dma when spi fifo is less than half full,
and limit tx bursts to half the fifo length.
Clamp rx burst length to 1 to avoid alignment issues.
Signed-off-by: Huibin Hong <huibin.hong@rock-chips.com>
Signed-off-by: Emil Renner Berthing <kernel@esmil.dk>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi-rockchip.c | 12 |
1 files changed, 3 insertions, 9 deletions
diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c index fdcf3076681b..2f825702cd90 100644 --- a/drivers/spi/spi-rockchip.c +++ b/drivers/spi/spi-rockchip.c @@ -455,10 +455,7 @@ static int 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; - if (rs->dma_caps.max_burst > 4) - rxconf.src_maxburst = 4; - else - rxconf.src_maxburst = 1; + rxconf.src_maxburst = 1; dmaengine_slave_config(rs->dma_rx.ch, &rxconf); rxdesc = dmaengine_prep_slave_sg( @@ -477,10 +474,7 @@ static int 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; - if (rs->dma_caps.max_burst > 4) - txconf.dst_maxburst = 4; - else - txconf.dst_maxburst = 1; + txconf.dst_maxburst = rs->fifo_len / 2; dmaengine_slave_config(rs->dma_tx.ch, &txconf); txdesc = dmaengine_prep_slave_sg( @@ -578,7 +572,7 @@ static void rockchip_spi_config(struct rockchip_spi *rs) writel_relaxed(rs->fifo_len / 2 - 1, rs->regs + ROCKCHIP_SPI_TXFTLR); writel_relaxed(rs->fifo_len / 2 - 1, rs->regs + ROCKCHIP_SPI_RXFTLR); - writel_relaxed(0, rs->regs + ROCKCHIP_SPI_DMATDLR); + writel_relaxed(rs->fifo_len / 2 - 1, rs->regs + ROCKCHIP_SPI_DMATDLR); writel_relaxed(0, rs->regs + ROCKCHIP_SPI_DMARDLR); writel_relaxed(dmacr, rs->regs + ROCKCHIP_SPI_DMACR); |