From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C095CC43603 for ; Wed, 11 Dec 2019 15:41:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9759022B48 for ; Wed, 11 Dec 2019 15:41:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576078913; bh=OSuoJBffl0SPH/noodNnIxyPimiT8MXfS1RUd1KxZGI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=sOAb5JA04Zb6RaIlYOYOHSAuUNuonP/azGJrdaJqwW/JmBTeAmwVQ0N7SHt8wAPut OebTha7FYC/ufiPij7n+0Yf5cDidXA/DZdSLm9/jNppkZiXXQHdESET1oJOxWPf8iS Yk0+ZQkRHaCvIcgb3PNoW9thdK7zm1GDiaDHjPrk= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1733179AbfLKPlx (ORCPT ); Wed, 11 Dec 2019 10:41:53 -0500 Received: from mail.kernel.org ([198.145.29.99]:33754 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387485AbfLKP1x (ORCPT ); Wed, 11 Dec 2019 10:27:53 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id E3CAB24658; Wed, 11 Dec 2019 15:27:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576078072; bh=OSuoJBffl0SPH/noodNnIxyPimiT8MXfS1RUd1KxZGI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=pUAjufWTK/DNMOXE0SyUr4hAyul5CBdyU2e5H9VWUze82+FTbOMorzquUOow7B3JY 36OE2FMNHgAruP489clMgCwvkykwkY+pZtobEa8Dr5uUubF7QmpbPVHXZXgSXERW78 bE9L1tgqHFMkz/AGYqlskHIrem7rzXbAxvzSiSX0= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Vladimir Oltean , Michael Walle , Linus Walleij , Sasha Levin , linux-gpio@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 63/79] gpio: mpc8xxx: Don't overwrite default irq_set_type callback Date: Wed, 11 Dec 2019 10:26:27 -0500 Message-Id: <20191211152643.23056-63-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191211152643.23056-1-sashal@kernel.org> References: <20191211152643.23056-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-gpio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org From: Vladimir Oltean [ Upstream commit 4e50573f39229d5e9c985fa3b4923a8b29619ade ] The per-SoC devtype structures can contain their own callbacks that overwrite mpc8xxx_gpio_devtype_default. The clear intention is that mpc8xxx_irq_set_type is used in case the SoC does not specify a more specific callback. But what happens is that if the SoC doesn't specify one, its .irq_set_type is de-facto NULL, and this overwrites mpc8xxx_irq_set_type to a no-op. This means that the following SoCs are affected: - fsl,mpc8572-gpio - fsl,ls1028a-gpio - fsl,ls1088a-gpio On these boards, the irq_set_type does exactly nothing, and the GPIO controller keeps its GPICR register in the hardware-default state. On the LS1028A, that is ACTIVE_BOTH, which means 2 interrupts are raised even if the IRQ client requests LEVEL_HIGH. Another implication is that the IRQs are not checked (e.g. level-triggered interrupts are not rejected, although they are not supported). Fixes: 82e39b0d8566 ("gpio: mpc8xxx: handle differences between incarnations at a single place") Signed-off-by: Vladimir Oltean Link: https://lore.kernel.org/r/20191115125551.31061-1-olteanv@gmail.com Tested-by: Michael Walle Signed-off-by: Linus Walleij Signed-off-by: Sasha Levin --- drivers/gpio/gpio-mpc8xxx.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/gpio/gpio-mpc8xxx.c b/drivers/gpio/gpio-mpc8xxx.c index c8673a5d94122..3f10f9599f2cb 100644 --- a/drivers/gpio/gpio-mpc8xxx.c +++ b/drivers/gpio/gpio-mpc8xxx.c @@ -348,7 +348,8 @@ static int mpc8xxx_probe(struct platform_device *pdev) * It's assumed that only a single type of gpio controller is available * on the current machine, so overwriting global data is fine. */ - mpc8xxx_irq_chip.irq_set_type = devtype->irq_set_type; + if (devtype->irq_set_type) + mpc8xxx_irq_chip.irq_set_type = devtype->irq_set_type; if (devtype->gpio_dir_out) gc->direction_output = devtype->gpio_dir_out; -- 2.20.1