From patchwork Thu Sep 6 12:45:23 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Felipe Balbi X-Patchwork-Id: 1414551 Return-Path: X-Original-To: patchwork-linux-omap@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork1.kernel.org (Postfix) with ESMTP id 10E093FC71 for ; Thu, 6 Sep 2012 12:55:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755561Ab2IFMzx (ORCPT ); Thu, 6 Sep 2012 08:55:53 -0400 Received: from na3sys009aog114.obsmtp.com ([74.125.149.211]:54466 "EHLO na3sys009aog114.obsmtp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755016Ab2IFMuV (ORCPT ); Thu, 6 Sep 2012 08:50:21 -0400 Received: from mail-lpp01m010-f46.google.com ([209.85.215.46]) (using TLSv1) by na3sys009aob114.postini.com ([74.125.148.12]) with SMTP ID DSNKUEicDJTsqqvMypQm2jDI5WR3EOlkEq0s@postini.com; Thu, 06 Sep 2012 05:50:20 PDT Received: by lagy9 with SMTP id y9so1063005lag.19 for ; Thu, 06 Sep 2012 05:50:18 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=from:to:cc:subject:date:message-id:x-mailer:in-reply-to:references :x-gm-message-state; bh=GU5PJAbUggwYhCwprMwvyTzH/z2n794gPbhvzQfryRk=; b=C9l8wmh28hTxNR3fTnsh4IfkmBNonq6vovxN7NVYxO/Q7TPvokMROg99SQICiSOVTe 7dA0ZKn1601sA0Vd+gTlI4zm+bJ6/zkE/8P4QCIZijSqD/kxuRXaxDoOOiBr/irE6s92 cxsxliCKUMeBomQBMNi4e3vKC6e3jQ7RsHwV+aqBoOYnpzKyM4mEQ1L9TCQoL6ck0ny0 kC29gwCU3Z1XorKvTcyqpkKq9k58jD5guMT/JeLGv18buUdFkwWHsxd841HIITZMxG5l ZGb1SNlyC4MRZimVv7fW3ERY8+sdn8L7k7X9GkVNZssQ2JwJLq4icEkBRbl9QaCN7bSB v+rw== Received: by 10.112.17.163 with SMTP id p3mr783534lbd.83.1346935818616; Thu, 06 Sep 2012 05:50:18 -0700 (PDT) Received: from localhost (cs78217178.pp.htv.fi. [62.78.217.178]) by mx.google.com with ESMTPS id xx8sm2059090lab.10.2012.09.06.05.50.16 (version=TLSv1/SSLv3 cipher=OTHER); Thu, 06 Sep 2012 05:50:17 -0700 (PDT) From: Felipe Balbi To: Greg KH Cc: alan@linux.intel.com, Tony Lindgren , Kevin Hilman , Linux OMAP Mailing List , Linux ARM Kernel Mailing List , linux-serial@vger.kernel.org, Linux Kernel Mailing List , Santosh Shilimkar , Shubhrajyoti Datta , Sourav Poddar , Felipe Balbi Subject: [PATCH v4 04/21] serial: omap: simplify IRQ handling Date: Thu, 6 Sep 2012 15:45:23 +0300 Message-Id: <1346935540-1792-5-git-send-email-balbi@ti.com> X-Mailer: git-send-email 1.7.12.rc3 In-Reply-To: <1346935540-1792-1-git-send-email-balbi@ti.com> References: <20120906122948.GC29202@arwen.pp.htv.fi> <1346935540-1792-1-git-send-email-balbi@ti.com> X-Gm-Message-State: ALoCoQlspuPX3e5O+ELQLXx8BjPrE6iQ1qy7FBYPmEd8tk1cLUuqDPqYPGOOaWjjO/eLPPtR7dDD Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org quite a few changes here, though they are pretty obvious. In summary we're making sure to detect which interrupt type we need to handle before calling the underlying interrupt handling procedure. Tested-by: Shubhrajyoti D Acked-by: Santosh Shilimkar Signed-off-by: Felipe Balbi --- drivers/tty/serial/omap-serial.c | 51 ++++++++++++++++++++++++++++++---------- 1 file changed, 38 insertions(+), 13 deletions(-) diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c index dd3971f..d5a08cb 100644 --- a/drivers/tty/serial/omap-serial.c +++ b/drivers/tty/serial/omap-serial.c @@ -351,33 +351,58 @@ static inline irqreturn_t serial_omap_irq(int irq, void *dev_id) { struct uart_omap_port *up = dev_id; unsigned int iir, lsr; + unsigned int type; unsigned long flags; + irqreturn_t ret = IRQ_NONE; + spin_lock_irqsave(&up->port.lock, flags); pm_runtime_get_sync(up->dev); iir = serial_in(up, UART_IIR); - if (iir & UART_IIR_NO_INT) { - pm_runtime_mark_last_busy(up->dev); - pm_runtime_put_autosuspend(up->dev); - return IRQ_NONE; - } +again: + if (iir & UART_IIR_NO_INT) + goto out; - spin_lock_irqsave(&up->port.lock, flags); + ret = IRQ_HANDLED; lsr = serial_in(up, UART_LSR); - if (iir & UART_IIR_RLSI) { + + /* extract IRQ type from IIR register */ + type = iir & 0x3e; + + switch (type) { + case UART_IIR_MSI: + check_modem_status(up); + break; + case UART_IIR_THRI: + if (lsr & UART_LSR_THRE) + transmit_chars(up); + break; + case UART_IIR_RDI: if (lsr & UART_LSR_DR) receive_chars(up, &lsr); + break; + case UART_IIR_RLSI: + if (lsr & UART_LSR_BRK_ERROR_BITS) + receive_chars(up, &lsr); + break; + case UART_IIR_RX_TIMEOUT: + receive_chars(up, &lsr); + break; + case UART_IIR_CTS_RTS_DSR: + iir = serial_in(up, UART_IIR); + goto again; + case UART_IIR_XOFF: + /* FALLTHROUGH */ + default: + break; } - check_modem_status(up); - if ((lsr & UART_LSR_THRE) && (iir & UART_IIR_THRI)) - transmit_chars(up); - +out: spin_unlock_irqrestore(&up->port.lock, flags); pm_runtime_mark_last_busy(up->dev); pm_runtime_put_autosuspend(up->dev); - up->port_activity = jiffies; - return IRQ_HANDLED; + + return ret; } static unsigned int serial_omap_tx_empty(struct uart_port *port)