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serial: samsung: Simplify DMA engine initialization code

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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>
This commit is contained in:
Marek Szyprowski 2016-12-16 10:56:53 +01:00 committed by Greg Kroah-Hartman
parent f87fa71e6f
commit ba3d6f8f10
2 changed files with 6 additions and 15 deletions
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17
drivers/tty/serial/samsung.c
View File

@ -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);

4
drivers/tty/serial/samsung.h
View File

@ -44,10 +44,6 @@ struct s3c24xx_serial_drv_data {
};
struct s3c24xx_uart_dma {
dma_filter_fn fn;
void *rx_param;
void *tx_param;
unsigned int rx_chan_id;
unsigned int tx_chan_id;