From patchwork Wed Dec 10 13:36:14 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Geert Uytterhoeven X-Patchwork-Id: 5469251 X-Patchwork-Delegate: geert@linux-m68k.org Return-Path: X-Original-To: patchwork-linux-sh@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 78918BEEA8 for ; Wed, 10 Dec 2014 13:36:26 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 631D02015A for ; Wed, 10 Dec 2014 13:36:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2A30920121 for ; Wed, 10 Dec 2014 13:36:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754662AbaLJNgX (ORCPT ); Wed, 10 Dec 2014 08:36:23 -0500 Received: from michel.telenet-ops.be ([195.130.137.88]:59515 "EHLO michel.telenet-ops.be" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753091AbaLJNgW (ORCPT ); Wed, 10 Dec 2014 08:36:22 -0500 Received: from ayla.of.borg ([84.193.93.87]) by michel.telenet-ops.be with bizsmtp id RpcK1p00M1t5w8s06pcKlZ; Wed, 10 Dec 2014 14:36:20 +0100 Received: from ramsan.of.borg ([192.168.97.29] helo=ramsan) by ayla.of.borg with esmtp (Exim 4.82) (envelope-from ) id 1XyhRD-0004QS-EP; Wed, 10 Dec 2014 14:36:19 +0100 Received: from geert by ramsan with local (Exim 4.82) (envelope-from ) id 1XyhRF-0004c0-Ij; Wed, 10 Dec 2014 14:36:21 +0100 From: Geert Uytterhoeven To: Linus Walleij , Alexandre Courbot , Thomas Gleixner Cc: Santosh Shilimkar , Ingo Molnar , linux-gpio@vger.kernel.org, linux-sh@vger.kernel.org, linux-kernel@vger.kernel.org, Geert Uytterhoeven Subject: [PATCH 1/2] gpio: pcf857x: Propagate wake-up setting to parent irq controller Date: Wed, 10 Dec 2014 14:36:14 +0100 Message-Id: <1418218575-17694-1-git-send-email-geert+renesas@glider.be> X-Mailer: git-send-email 1.9.1 Sender: linux-sh-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-sh@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham 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 The pcf857x GPIO and interrupt controller uses dummy_irq_chip, which does not implement irq_chip.irq_set_wake() and does not set IRQCHIP_SKIP_SET_WAKE. This causes two s2ram issues if wake-up is enabled for the pcf857x GPIO pins: 1. During resume from s2ram, the following warning is printed: WARNING: CPU: 0 PID: 1046 at kernel/irq/manage.c:537 irq_set_irq_wake+0x9c/0xf8() Unbalanced IRQ 113 wake disable 2. Wake-up through the pcf857x GPIO pins may fail, as the parent interrupt controller may be suspended. Migrate the pcf857x GPIO and interrupt controller from dummy_irq_chip to its own irq_chip. This irq chip implements irq_chip.irq_set_wake() to propagate its wake-up setting to the parent interrupt controller. This fixes wake-up through gpio-keys on sh73a0/kzm9g, where the pcf857x interrupt is cascaded to irq-renesas-intc-irqpin, and the latter must not be suspended when wake-up is enabled. Signed-off-by: Geert Uytterhoeven --- drivers/gpio/gpio-pcf857x.c | 33 ++++++++++++++++++++++++++++++++- 1 file changed, 32 insertions(+), 1 deletion(-) diff --git a/drivers/gpio/gpio-pcf857x.c b/drivers/gpio/gpio-pcf857x.c index 236708ad0a5ba0ab..22dbecb004cf6c5b 100644 --- a/drivers/gpio/gpio-pcf857x.c +++ b/drivers/gpio/gpio-pcf857x.c @@ -218,14 +218,45 @@ static irqreturn_t pcf857x_irq(int irq, void *data) return IRQ_HANDLED; } +/* + * NOP functions + */ +static void noop(struct irq_data *data) { } + +static unsigned int noop_ret(struct irq_data *data) +{ + return 0; +} + +static int pcf857x_irq_set_wake(struct irq_data *data, unsigned int on) +{ + struct pcf857x *gpio = irq_data_get_irq_chip_data(data); + + irq_set_irq_wake(gpio->client->irq, on); + return 0; +} + +static struct irq_chip pcf857x_irq_chip = { + .name = "pcf857x", + .irq_startup = noop_ret, + .irq_shutdown = noop, + .irq_enable = noop, + .irq_disable = noop, + .irq_ack = noop, + .irq_mask = noop, + .irq_unmask = noop, + .irq_set_wake = pcf857x_irq_set_wake, +}; + static int pcf857x_irq_domain_map(struct irq_domain *domain, unsigned int irq, irq_hw_number_t hw) { struct pcf857x *gpio = domain->host_data; irq_set_chip_and_handler(irq, - &dummy_irq_chip, + &pcf857x_irq_chip, handle_level_irq); + irq_set_chip_data(irq, gpio); #ifdef CONFIG_ARM set_irq_flags(irq, IRQF_VALID); #else