Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755308AbaLIJLs (ORCPT ); Tue, 9 Dec 2014 04:11:48 -0500 Received: from relay1.mentorg.com ([192.94.38.131]:62405 "EHLO relay1.mentorg.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752730AbaLIJLn (ORCPT ); Tue, 9 Dec 2014 04:11:43 -0500 From: Jiada Wang To: , , , CC: , , Subject: [PATCH v1 01/15] serial: imx: add CREAD flag support Date: Tue, 9 Dec 2014 18:11:22 +0900 Message-ID: <1418116296-12082-2-git-send-email-jiada_wang@mentor.com> X-Mailer: git-send-email 1.9.3 In-Reply-To: <1418116296-12082-1-git-send-email-jiada_wang@mentor.com> References: <1418116296-12082-1-git-send-email-jiada_wang@mentor.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add CREAD flag hanlding in set_termios and UART DMA mode which ignores all received chars when CREAD flag cleared. Signed-off-by: Jiada Wang Signed-off-by: Anton Bondarenko --- drivers/tty/serial/imx.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index 8f62a3c..4d3fa53 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -74,6 +74,7 @@ #define IMX21_UTS 0xb4 /* UART Test Register on all other i.mx*/ /* UART Control Register Bit Fields.*/ +#define URXD_DUMMY_READ (1<<16) #define URXD_CHARRDY (1<<15) #define URXD_ERR (1<<14) #define URXD_OVRRUN (1<<13) @@ -710,6 +711,9 @@ static irqreturn_t imx_rxint(int irq, void *dev_id) #endif } + if (sport->port.ignore_status_mask & URXD_DUMMY_READ) + goto out; + tty_insert_flip_char(port, rx, flg); } @@ -910,7 +914,8 @@ static void dma_rx_callback(void *data) dev_dbg(sport->port.dev, "We get %d bytes.\n", count); if (count) { - tty_insert_flip_string(port, sport->rx_buf, count); + if (!(sport->port.ignore_status_mask & URXD_DUMMY_READ)) + tty_insert_flip_string(port, sport->rx_buf, count); tty_flip_buffer_push(port); start_rx_dma(sport); @@ -1382,6 +1387,9 @@ imx_set_termios(struct uart_port *port, struct ktermios *termios, sport->port.ignore_status_mask |= URXD_OVRRUN; } + if ((termios->c_cflag & CREAD) == 0) + sport->port.ignore_status_mask |= URXD_DUMMY_READ; + /* * Update the per-port timeout. */ -- 1.9.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/