From 692aa1905679bd72f84115986235d214f6096a98 Mon Sep 17 00:00:00 2001 From: "Chuah, Kim Tatt" Date: Wed, 15 Jun 2016 13:44:13 +0800 Subject: [PATCH] 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 Acked-by: Andy Shevchenko Reviewed-by: Heikki Krogerus Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_mid.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/tty/serial/8250/8250_mid.c b/drivers/tty/serial/8250/8250_mid.c index b218ff528df7..339de9cd0866 100644 --- a/drivers/tty/serial/8250/8250_mid.c +++ b/drivers/tty/serial/8250/8250_mid.c @@ -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)) { -- 2.20.1