diff options
| author | Marek Szyprowski <m.szyprowski@samsung.com> | 2016-12-16 10:56:53 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-01-12 11:51:24 +0100 |
| commit | ba3d6f8f10c3897e0edde3069beb0bfbe81783a6 (patch) | |
| tree | 9b4c9c8f512729283b250ea0cdc20bb2a4e50448 /drivers/tty/serial/samsung.c | |
| parent | f87fa71e6fb0fa7bade9c3f3bb3f49325e76a90a (diff) | |
serial: samsung: Simplify DMA engine initialization code
dma_request_slave_channel_compat() requires filter function and mask, which
are not needed on device tree based platforms, so simplify the code by
calling the more appropriate dma_request_chan() function. This additionally
gives us proper error handling, because the new function returns error
codes instead of NULL on failure.
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/samsung.c')
| -rw-r--r-- | drivers/tty/serial/samsung.c | 17 |
1 files changed, 6 insertions, 11 deletions
diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c index f44615fa474d..a9b309ba24a4 100644 --- a/drivers/tty/serial/samsung.c +++ b/drivers/tty/serial/samsung.c @@ -859,7 +859,6 @@ static void s3c24xx_serial_break_ctl(struct uart_port *port, int break_state) static int s3c24xx_serial_request_dma(struct s3c24xx_uart_port *p) { struct s3c24xx_uart_dma *dma = p->dma; - dma_cap_mask_t mask; unsigned long flags; /* Default slave configuration parameters */ @@ -876,21 +875,17 @@ static int s3c24xx_serial_request_dma(struct s3c24xx_uart_port *p) else dma->tx_conf.dst_maxburst = 1; - dma_cap_zero(mask); - dma_cap_set(DMA_SLAVE, mask); + dma->rx_chan = dma_request_chan(p->port.dev, "rx"); - dma->rx_chan = dma_request_slave_channel_compat(mask, dma->fn, - dma->rx_param, p->port.dev, "rx"); - if (!dma->rx_chan) - return -ENODEV; + if (IS_ERR(dma->rx_chan)) + return PTR_ERR(dma->rx_chan); dmaengine_slave_config(dma->rx_chan, &dma->rx_conf); - dma->tx_chan = dma_request_slave_channel_compat(mask, dma->fn, - dma->tx_param, p->port.dev, "tx"); - if (!dma->tx_chan) { + dma->tx_chan = dma_request_chan(p->port.dev, "tx"); + if (IS_ERR(dma->tx_chan)) { dma_release_channel(dma->rx_chan); - return -ENODEV; + return PTR_ERR(dma->tx_chan); } dmaengine_slave_config(dma->tx_chan, &dma->tx_conf); |