AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2024-11-25 01:30:52 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity

spi/rockchip: fix bug that cause spi transfer timed out in DMA duplex mode

Browse Source 
In rx mode, dma must be prepared before spi is enabled.
But in tx and tr mode, spi must be enabled first.

Signed-off-by: Addy Ke <addy.ke@rock-chips.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Addy Ke 2014-10-15 19:26:18 +08:00 committed by Mark Brown
parent f9cfd52262
commit c28be31b11
1 changed files with 23 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
drivers/spi/spi-rockchip.c
View File

@ -328,6 +328,8 @@ static int rockchip_spi_unprepare_message(struct spi_master *master,
spin_unlock_irqrestore(&rs->lock, flags);
spi_enable_chip(rs, 0);
return 0;
}
@ -384,6 +386,8 @@ static int rockchip_spi_pio_transfer(struct rockchip_spi *rs)
if (rs->tx)
wait_for_idle(rs);
spi_enable_chip(rs, 0);
return 0;
}
@ -395,8 +399,10 @@ static void rockchip_spi_dma_rxcb(void *data)
spin_lock_irqsave(&rs->lock, flags);
rs->state &= ~RXBUSY;
if (!(rs->state & TXBUSY))
if (!(rs->state & TXBUSY)) {
spi_enable_chip(rs, 0);
spi_finalize_current_transfer(rs->master);
}
spin_unlock_irqrestore(&rs->lock, flags);
}
@ -512,8 +518,6 @@ static void rockchip_spi_config(struct rockchip_spi *rs)
div = max_t(u32, rs->max_freq / rs->speed, 1);
div = (div + 1) & 0xfffe;
spi_enable_chip(rs, 0);
writel_relaxed(cr0, rs->regs + ROCKCHIP_SPI_CTRLR0);
writel_relaxed(rs->len - 1, rs->regs + ROCKCHIP_SPI_CTRLR1);
@ -527,8 +531,6 @@ static void rockchip_spi_config(struct rockchip_spi *rs)
spi_set_clk(rs, div);
dev_dbg(rs->dev, "cr0 0x%x, div %d\n", cr0, div);
spi_enable_chip(rs, 1);
}
static int rockchip_spi_transfer_one(
@ -536,7 +538,7 @@ static int rockchip_spi_transfer_one(
struct spi_device *spi,
struct spi_transfer *xfer)
{
int ret = 0;
int ret = 1;
struct rockchip_spi *rs = spi_master_get_devdata(master);
WARN_ON(readl_relaxed(rs->regs + ROCKCHIP_SPI_SSIENR) &&
@ -568,17 +570,27 @@ static int rockchip_spi_transfer_one(
rs->tmode = CR0_XFM_RO;
/* we need prepare dma before spi was enabled */
if (master->can_dma && master->can_dma(master, spi, xfer)) {
if (master->can_dma && master->can_dma(master, spi, xfer))
rs->use_dma = 1;
rockchip_spi_prepare_dma(rs);
} else {
else
rs->use_dma = 0;
}
rockchip_spi_config(rs);
if (!rs->use_dma)
if (rs->use_dma) {
if (rs->tmode == CR0_XFM_RO) {
/* rx: dma must be prepared first */
rockchip_spi_prepare_dma(rs);
spi_enable_chip(rs, 1);
} else {
/* tx or tr: spi must be enabled first */
spi_enable_chip(rs, 1);
rockchip_spi_prepare_dma(rs);
}
} else {
spi_enable_chip(rs, 1);
ret = rockchip_spi_pio_transfer(rs);
}
return ret;
}