hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

serial: 8250_dma: Fix RX handling 

Overrun, parity and framing errors should be handled in
8250_core. This also adds check for the dma_status and exits
if the channel is not idle.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Heikki Krogerus 2013-04-10 16:58:25 +03:00 committed by Greg Kroah-Hartman
parent 5ea5b24da8
commit 75df022b5f
1 changed files with 16 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
drivers/tty/serial/8250/8250_dma.c
View File

@ -101,20 +101,29 @@ int serial8250_rx_dma(struct uart_8250_port *p, unsigned int iir)
struct dma_tx_state state;
int dma_status;
/*
* If RCVR FIFO trigger level was not reached, complete the transfer and
* let 8250.c copy the remaining data.
*/
if ((iir & 0x3f) == UART_IIR_RX_TIMEOUT) {
dma_status = dmaengine_tx_status(dma->rxchan, dma->rx_cookie,
&state);
dma_status = dmaengine_tx_status(dma->rxchan, dma->rx_cookie, &state);
switch (iir & 0x3f) {
case UART_IIR_RLSI:
/* 8250_core handles errors and break interrupts */
return -EIO;
case UART_IIR_RX_TIMEOUT:
/*
* If RCVR FIFO trigger level was not reached, complete the
* transfer and let 8250_core copy the remaining data.
*/
if (dma_status == DMA_IN_PROGRESS) {
dmaengine_pause(dma->rxchan);
__dma_rx_complete(p);
}
return -ETIMEDOUT;
default:
break;
}
if (dma_status)
return 0;
desc = dmaengine_prep_slave_single(dma->rxchan, dma->rx_addr,
dma->rx_size, DMA_DEV_TO_MEM,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);