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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7BA5AC433EF for ; Tue, 18 Jan 2022 02:39:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346014AbiARCj0 (ORCPT ); Mon, 17 Jan 2022 21:39:26 -0500 Received: from ams.source.kernel.org ([145.40.68.75]:44310 "EHLO ams.source.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343815AbiARCdX (ORCPT ); Mon, 17 Jan 2022 21:33:23 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id C6DFFB81240; Tue, 18 Jan 2022 02:33:20 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 321EAC36AF6; Tue, 18 Jan 2022 02:33:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1642473199; bh=KuDx/9P+Wps9AtzStWZ2hI77/d8sYbhn6+5ghzmQjp0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=o0Fuj1sham3qpyeVs82YAoQqT1EkqxrScFRua84VhZgkZaE6xP7Rz7+ucXKVBZ/6X JyA0hpYTfyWodUm8bPMv5fBa9s8hHwpU8tZxZ74bl2I0CWtBBDIcZQozUqkhP8DHiL ecIF70C3+on5+66erC1bDRitIVgpg+bCqJqYRAiVYS4Tn+gSFzRuPjnGbVRoITamii ZSOex0OyNqKu9ITLhKhKz7Q/bxY076y6iPi3Am5rqS0p94SY18i5WZ3N2BbtZxdE3+ 0L97nDd/ppQZaBBDu8+lX6RRLH3HMXQkhfUaMweajno4Pk9E+KSmhrW/cVwiItmj6B kKLiSrPBRpDBQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Amjad Ouled-Ameur , Jerome Brunet , Greg Kroah-Hartman , Sasha Levin , balbi@kernel.org, narmstrong@baylibre.com, khilman@baylibre.com, p.zabel@pengutronix.de, linux-usb@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-amlogic@lists.infradead.org Subject: [PATCH AUTOSEL 5.15 023/188] usb: dwc3: meson-g12a: fix shared reset control use Date: Mon, 17 Jan 2022 21:29:07 -0500 Message-Id: <20220118023152.1948105-23-sashal@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220118023152.1948105-1-sashal@kernel.org> References: <20220118023152.1948105-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Amjad Ouled-Ameur [ Upstream commit 4ce3b45704d5ef46fb4b28083c8aba6716fabf3b ] reset_control_(de)assert() calls are called on a shared reset line when reset_control_reset has been used. This is not allowed by the reset framework. Use reset_control_rearm() call in suspend() and remove() as a way to state that the resource is no longer used, hence the shared reset line may be triggered again by other devices. Use reset_control_rearm() also in case probe fails after reset() has been called. reset_control_rearm() keeps use of triggered_count sane in the reset framework, use of reset_control_reset() on shared reset line should be balanced with reset_control_rearm(). Signed-off-by: Amjad Ouled-Ameur Reported-by: Jerome Brunet Link: https://lore.kernel.org/r/20211112162827.128319-3-aouledameur@baylibre.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/usb/dwc3/dwc3-meson-g12a.c | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) diff --git a/drivers/usb/dwc3/dwc3-meson-g12a.c b/drivers/usb/dwc3/dwc3-meson-g12a.c index d0f9b7c296b0d..bd814df3bf8b8 100644 --- a/drivers/usb/dwc3/dwc3-meson-g12a.c +++ b/drivers/usb/dwc3/dwc3-meson-g12a.c @@ -755,16 +755,16 @@ static int dwc3_meson_g12a_probe(struct platform_device *pdev) ret = dwc3_meson_g12a_get_phys(priv); if (ret) - goto err_disable_clks; + goto err_rearm; ret = priv->drvdata->setup_regmaps(priv, base); if (ret) - goto err_disable_clks; + goto err_rearm; if (priv->vbus) { ret = regulator_enable(priv->vbus); if (ret) - goto err_disable_clks; + goto err_rearm; } /* Get dr_mode */ @@ -825,6 +825,9 @@ static int dwc3_meson_g12a_probe(struct platform_device *pdev) if (priv->vbus) regulator_disable(priv->vbus); +err_rearm: + reset_control_rearm(priv->reset); + err_disable_clks: clk_bulk_disable_unprepare(priv->drvdata->num_clks, priv->drvdata->clks); @@ -852,6 +855,8 @@ static int dwc3_meson_g12a_remove(struct platform_device *pdev) pm_runtime_put_noidle(dev); pm_runtime_set_suspended(dev); + reset_control_rearm(priv->reset); + clk_bulk_disable_unprepare(priv->drvdata->num_clks, priv->drvdata->clks); @@ -892,7 +897,7 @@ static int __maybe_unused dwc3_meson_g12a_suspend(struct device *dev) phy_exit(priv->phys[i]); } - reset_control_assert(priv->reset); + reset_control_rearm(priv->reset); return 0; } @@ -902,7 +907,9 @@ static int __maybe_unused dwc3_meson_g12a_resume(struct device *dev) struct dwc3_meson_g12a *priv = dev_get_drvdata(dev); int i, ret; - reset_control_deassert(priv->reset); + ret = reset_control_reset(priv->reset); + if (ret) + return ret; ret = priv->drvdata->usb_init(priv); if (ret) -- 2.34.1