Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752180Ab0LCPGx (ORCPT ); Fri, 3 Dec 2010 10:06:53 -0500 Received: from eu1sys200aog105.obsmtp.com ([207.126.144.119]:60376 "EHLO eu1sys200aog105.obsmtp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750807Ab0LCPGt (ORCPT ); Fri, 3 Dec 2010 10:06:49 -0500 From: Sundar Iyer To: , , , Cc: , , Sundar Iyer Subject: [PATCH 11/20] mfd/tc3589x: fix random interrupt misses Date: Fri, 3 Dec 2010 20:35:44 +0530 Message-ID: <1291388753-14662-12-git-send-email-sundar.iyer@stericsson.com> X-Mailer: git-send-email 1.7.2.dirty In-Reply-To: <1291388753-14662-1-git-send-email-sundar.iyer@stericsson.com> References: <1291388753-14662-1-git-send-email-sundar.iyer@stericsson.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 Content-Length: 1493 Lines: 45 On the TC35892, a random delayed interrupt clear (GPIO IC) write locks up the child interrupts. In such a case, the original interrupt is active and not yet acknowledged. Re-check the IRQST bit for any pending interrupts and handle those. Signed-off-by: Sundar Iyer --- drivers/mfd/tc3589x.c | 8 ++++++-- 1 files changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/mfd/tc3589x.c b/drivers/mfd/tc3589x.c index 5672d56..e173f33 100644 --- a/drivers/mfd/tc3589x.c +++ b/drivers/mfd/tc3589x.c @@ -158,6 +158,7 @@ static irqreturn_t tc3589x_irq(int irq, void *data) struct tc3589x *tc3589x = data; int status; +again: status = tc3589x_reg_read(tc3589x, TC3589x_IRQST); if (status < 0) return IRQ_NONE; @@ -172,9 +173,12 @@ static irqreturn_t tc3589x_irq(int irq, void *data) /* * A dummy read or write (to any register) appears to be necessary to * have the last interrupt clear (for example, GPIO IC write) take - * effect. + * effect. In such a case, recheck for any interrupt which is still + * pending. */ - tc3589x_reg_read(tc3589x, TC3589x_IRQST); + status = tc3589x_reg_read(tc3589x, TC3589x_IRQST); + if (status) + goto again; return IRQ_HANDLED; } -- 1.7.2.dirty -- 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/