From patchwork Fri Aug 23 03:43:06 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ye Zhang X-Patchwork-Id: 13774561 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 0B78AC52D7C for ; Fri, 23 Aug 2024 03:47:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=vfagnm/2cZBspp0iuuHjQlsoD4A5ZXzku9bzq7Fy2kI=; b=Cy7qlKaUaqXOizSqMC2DYPcOVr kmGbCKStCAwdusTpHTgVwEtQRipOyCwRToID7X3vjnjYorTnbrTv2hywmQwXzX8OiKrkxcQIswwXR gFku9VDw9ilFBkgs4t7mVHV9INMOhiYxlky3n8VX69k0MJUECKiSEICfLizs1D8KF8QrPfYsqPqLI 9Si/fIpJ0POnbW8C0x+6BB+tZqCP0zYAoDk9uaFWOfN107rBXkcCp/E8uJgpPQp/uib2d6rqZcf78 qECGUTIgin/ABNHydNIRlpq1j/iI5n2GBuqvsHGD4wOQ4W1tg83W0fhbEMd7XO1Yvozv3XRL0QWz5 KsYaVTdg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1shLH2-0000000F5f5-3Whx; Fri, 23 Aug 2024 03:47:41 +0000 Received: from mail-m118220.qiye.163.com ([115.236.118.220]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1shLEn-0000000F4zA-0UCK; Fri, 23 Aug 2024 03:45:24 +0000 DKIM-Signature: a=rsa-sha256; b=Bz9IFpiy268CyAP1qfIFGlZ/ayx6Mtjr+z9BhGwIX3Ocl1WXhpPM2xIFAy4ewpcFiMdazmkhSqFjljgn9ZRfKkeUZ3QZZHK7Cse3rkuEi9Ir8ln9WaJR2jSQuJMzwolH0xT7VX8hSHYIDU7MMOG+e5kUysSq/wO6sISDB+by0iw=; s=default; c=relaxed/relaxed; d=rock-chips.com; v=1; bh=vfagnm/2cZBspp0iuuHjQlsoD4A5ZXzku9bzq7Fy2kI=; h=date:mime-version:subject:message-id:from; Received: from rockchip.. (unknown [58.22.7.114]) by smtp.qiye.163.com (Hmail) with ESMTPA id 2E8007E03DF; Fri, 23 Aug 2024 11:45:01 +0800 (CST) From: Ye Zhang To: linus.walleij@linaro.org, brgl@bgdev.pl, heiko@sntech.de, linux-gpio@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org, mika.westerberg@linux.intel.com, andriy.shevchenko@linux.intel.com, tao.huang@rock-chips.com, finley.xiao@rock-chips.com, tim.chen@rock-chips.com, elaine.zhang@rock-chips.com, Ye Zhang Subject: [PATCH v2] gpio: rockchip: resolve overflow issues Date: Fri, 23 Aug 2024 11:43:06 +0800 Message-Id: <20240823034314.62305-4-ye.zhang@rock-chips.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240823034314.62305-1-ye.zhang@rock-chips.com> References: <20240823034314.62305-1-ye.zhang@rock-chips.com> MIME-Version: 1.0 X-HM-Spam-Status: e1kfGhgUHx5ZQUpXWQgPGg8OCBgUHx5ZQUlOS1dZFg8aDwILHllBWSg2Ly tZV1koWUFDSUNOT01LS0k3V1ktWUFJV1kPCRoVCBIfWUFZQ0MeGlYdHkwfQhodSBgfQh1WFRQJFh oXVRMBExYaEhckFA4PWVdZGBILWUFZTkNVSUlVTFVKSk9ZV1kWGg8SFR0UWUFZT0tIVUpLSUhCSE NVSktLVUpCS0tZBg++ X-HM-Tid: 0a917d566dcd09cfkunm2e8007e03df X-HM-MType: 1 X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6OBg6Kio4TzI3KCweTjQ9ThEa PRoKCx1VSlVKTElPSENPTEtJSEJLVTMWGhIXVQIeVQETGhUcOwkUGBBWGBMSCwhVGBQWRVlXWRIL WUFZTkNVSUlVTFVKSk9ZV1kIAVlBSU5DTDcG X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240822_204521_699337_EE87EB85 X-CRM114-Status: UNSURE ( 8.72 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Prevent overflow issues when performing debounce-related calculations. Fixes: 3bcbd1a85b68 ("gpio/rockchip: support next version gpio controller") Signed-off-by: Ye Zhang --- drivers/gpio/gpio-rockchip.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/gpio/gpio-rockchip.c b/drivers/gpio/gpio-rockchip.c index 5f60162baaeb..bf22b103b6a2 100644 --- a/drivers/gpio/gpio-rockchip.c +++ b/drivers/gpio/gpio-rockchip.c @@ -209,11 +209,12 @@ static int rockchip_gpio_set_debounce(struct gpio_chip *gc, freq = clk_get_rate(bank->db_clk); if (!freq) return -EINVAL; - max_debounce = (GENMASK(23, 0) + 1) * 2 * 1000000 / freq; + div = (u64)(GENMASK(23, 0) + 1) * 2 * 1000000; + max_debounce = DIV_ROUND_CLOSEST_ULL(div, freq); if (debounce > max_debounce) return -EINVAL; - div = debounce * freq; + div = (u64)debounce * freq; div_reg = DIV_ROUND_CLOSEST_ULL(div, 2 * USEC_PER_SEC) - 1; } else { div_debounce_support = false;