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serial: 8250_mid: Read RX buffer on RX DMA timeout for DNV 

In DNV, when RX DMA is used and number of bytes received is less than
transfer size, only RX DMA timeout interrupt is sent. When this happens,
read the RX buffer.

Signed-off-by: Chuah, Kim Tatt <kim.tatt.chuah@intel.com>
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chuah, Kim Tatt 2016-06-15 13:44:13 +08:00 committed by Greg Kroah-Hartman
parent fd9e516d83
commit 692aa19056
1 changed files with 4 additions and 2 deletions
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6
drivers/tty/serial/8250/8250_mid.c
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@ -96,6 +96,7 @@ static int tng_setup(struct mid8250 *mid, struct uart_port *p)
static int dnv_handle_irq(struct uart_port *p)
{
struct mid8250 *mid = p->private_data;
struct uart_8250_port *up = up_to_u8250p(p);
unsigned int fisr = serial_port_in(p, INTEL_MID_UART_DNV_FISR);
u32 status;
int ret = IRQ_NONE;
@ -103,9 +104,10 @@ static int dnv_handle_irq(struct uart_port *p)
if (fisr & BIT(2)) {
err = hsu_dma_get_status(&mid->dma_chip, 1, &status);
if (err > 0)
if (err > 0) {
serial8250_rx_dma_flush(up);
ret |= IRQ_HANDLED;
else if (err == 0)
} else if (err == 0)
ret |= hsu_dma_do_irq(&mid->dma_chip, 1, status);
}
if (fisr & BIT(1)) {