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Sun, 22 Nov 2015 02:58:24 +0000 Received: from unknown-38-66.xilinx.com ([149.199.38.66] helo=xsj-pvapsmtp01) by xsj-pvapsmtpgw01 with esmtp (Exim 4.63) (envelope-from ) id 1a0Kr9-0003uC-86; Sat, 21 Nov 2015 18:58:23 -0800 Received: from [127.0.0.1] (helo=localhost) by xsj-pvapsmtp01 with smtp (Exim 4.63) (envelope-from ) id 1a0Kr9-00059z-3O; Sat, 21 Nov 2015 18:58:23 -0800 Received: from xsj-pvapsmtp01 (mailhub.xilinx.com [149.199.38.66]) by xsj-smtp-dlp2.xlnx.xilinx.com (8.13.8/8.13.1) with ESMTP id tAM2wKKw002495; Sat, 21 Nov 2015 18:58:21 -0800 Received: from [172.19.74.49] (helo=localhost) by xsj-pvapsmtp01 with esmtp (Exim 4.63) (envelope-from ) id 1a0Kr6-00059h-TC; Sat, 21 Nov 2015 18:58:20 -0800 From: Soren Brinkmann To: Greg Kroah-Hartman , Jiri Slaby Subject: [PATCH LINUX v3 09/10] tty: xuartps: Only handle RX IRQs when RX is enabled Date: Sat, 21 Nov 2015 18:59:31 -0800 Message-ID: <1448161172-19717-10-git-send-email-soren.brinkmann@xilinx.com> X-Mailer: git-send-email 2.6.3.3.g9bb996a In-Reply-To: <1448161172-19717-1-git-send-email-soren.brinkmann@xilinx.com> References: <1448161172-19717-1-git-send-email-soren.brinkmann@xilinx.com> X-RCIS-Action: ALLOW X-TM-AS-Product-Ver: IMSS-7.1.0.1224-8.0.0.1202-21954.006 X-TM-AS-User-Approved-Sender: Yes;Yes X-EOPAttributedMessage: 0 X-Forefront-Antispam-Report: CIP:149.199.60.83; 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BCL:0; PCL:0; RULEID:; SRVR:BL2NAM02HT005; X-Forefront-PRVS: 076804FE30 X-OriginatorOrg: xilinx.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Nov 2015 02:58:24.0870 (UTC) X-MS-Exchange-CrossTenant-Id: 657af505-d5df-48d0-8300-c31994686c5c X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=657af505-d5df-48d0-8300-c31994686c5c; Ip=[149.199.60.83]; Helo=[xsj-pvapsmtpgw01] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL2NAM02HT005 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20151121_185848_428399_49080497 X-CRM114-Status: GOOD ( 13.50 ) X-Spam-Score: -1.9 (-) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Hurley , Michal Simek , linux-kernel@vger.kernel.org, Soren Brinkmann , linux-serial@vger.kernel.org, linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.8 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Ignore RX-related interrupts if RX is not enabled. Signed-off-by: Soren Brinkmann --- drivers/tty/serial/xilinx_uartps.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c index db9e23eaf300..3a1e508926c1 100644 --- a/drivers/tty/serial/xilinx_uartps.c +++ b/drivers/tty/serial/xilinx_uartps.c @@ -161,6 +161,7 @@ MODULE_PARM_DESC(rx_timeout, "Rx timeout, 1-255"); * @pclk: APB clock * @baud: Current baud rate * @clk_rate_change_nb: Notifier block for clock changes + * @flags: Driver flags */ struct cdns_uart { struct uart_port *port; @@ -168,7 +169,11 @@ struct cdns_uart { struct clk *pclk; unsigned int baud; struct notifier_block clk_rate_change_nb; + u32 flags; }; + +#define CDNS_FLAG_RX_ENABLED BIT(0) + #define to_cdns_uart(_nb) container_of(_nb, struct cdns_uart, \ clk_rate_change_nb); @@ -262,6 +267,7 @@ static void cdns_uart_handle_rx(struct uart_port *port, unsigned int isrstatus) static irqreturn_t cdns_uart_isr(int irq, void *dev_id) { struct uart_port *port = (struct uart_port *)dev_id; + struct cdns_uart *cdns_uart = port->private_data; unsigned long flags; unsigned int isrstatus, numbytes; @@ -272,7 +278,8 @@ static irqreturn_t cdns_uart_isr(int irq, void *dev_id) */ isrstatus = readl(port->membase + CDNS_UART_ISR_OFFSET); - cdns_uart_handle_rx(port, isrstatus); + if (cdns_uart->flags & CDNS_FLAG_RX_ENABLED) + cdns_uart_handle_rx(port, isrstatus); /* Dispatch an appropriate handler */ if ((isrstatus & CDNS_UART_IXR_TXEMPTY) == CDNS_UART_IXR_TXEMPTY) { @@ -579,11 +586,13 @@ static void cdns_uart_stop_tx(struct uart_port *port) static void cdns_uart_stop_rx(struct uart_port *port) { unsigned int regval; + struct cdns_uart *cdns_uart = port->private_data; regval = readl(port->membase + CDNS_UART_CR_OFFSET); regval |= CDNS_UART_CR_RX_DIS; /* Disable the receiver */ writel(regval, port->membase + CDNS_UART_CR_OFFSET); + cdns_uart->flags &= ~CDNS_FLAG_RX_ENABLED; } /** @@ -764,6 +773,7 @@ static int cdns_uart_startup(struct uart_port *port) { unsigned long flags; unsigned int retval = 0, status = 0; + struct cdns_uart *cdns_uart = port->private_data; retval = request_irq(port->irq, cdns_uart_isr, 0, CDNS_UART_NAME, (void *)port); @@ -790,6 +800,7 @@ static int cdns_uart_startup(struct uart_port *port) status &= CDNS_UART_CR_RX_DIS; status |= CDNS_UART_CR_RX_EN; writel(status, port->membase + CDNS_UART_CR_OFFSET); + cdns_uart->flags |= CDNS_FLAG_RX_ENABLED; /* Set the Mode Register with normal mode,8 data bits,1 stop bit, * no parity. @@ -833,6 +844,7 @@ static void cdns_uart_shutdown(struct uart_port *port) { int status; unsigned long flags; + struct cdns_uart *cdns_uart = port->private_data; spin_lock_irqsave(&port->lock, flags); @@ -844,6 +856,7 @@ static void cdns_uart_shutdown(struct uart_port *port) /* Disable the TX and RX */ writel(CDNS_UART_CR_TX_DIS | CDNS_UART_CR_RX_DIS, port->membase + CDNS_UART_CR_OFFSET); + cdns_uart->flags &= ~CDNS_FLAG_RX_ENABLED; spin_unlock_irqrestore(&port->lock, flags);