From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 86E7915530C; Thu, 15 Jan 2026 17:19:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768497575; cv=none; b=H+dd4OkghXnNalcYr5IdXt8dqa8jhA1fS6eQ8JM3+M00Foa9itx5rK439MMPTz1yox1A5u9FXCmv+gqrLoykzsRHx/X+OxJg9OcDUh9Hgb+vl/3pZ5m6vvdi7/yEdHkpUobZzZkykVqY+u1ayzAF2YeCtADNPobvXwWBYc0csAg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768497575; c=relaxed/simple; bh=hoX/VjTrNYtasnvMXNyEHSGESS9FvKqLLMFh/O4HYfs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=mry6O46ZVcYpM3CvC1Rc+GQ2TbBg89Xtr0dUXKW62SA6gM2Pr0mUQ15+mTLMw8TyyAsEWVOzzamxxCACavKbpLWJqKEZKE4r93QEFhn3Mb/EDAXm34h8Z58ft5FMvYzhUkIozbUfYHZMc5jGlA4vvNbXjTkXZmIXUNPehzLJ8GU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=muWFRar4; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="muWFRar4" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BA237C116D0; Thu, 15 Jan 2026 17:19:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1768497575; bh=hoX/VjTrNYtasnvMXNyEHSGESS9FvKqLLMFh/O4HYfs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=muWFRar4IVbTPvQTZ81ifMXKqzCceowp6d0BPWaECNT6GDeDUVny+RrrF1mrKqES0 zGhUaXmBw+QzSfDZDBWsdlBq7yRlb2DGlgQ5Qy3rEfwg/LYE1VKyNW/BwSyfXw60OW brDhezlA6Xd6o0F8za0Me86Ss1z4kPX5nM19j2g8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jisheng Zhang , Sasha Levin Subject: [PATCH 5.15 128/554] usb: dwc2: fix hang during suspend if set as peripheral Date: Thu, 15 Jan 2026 17:43:14 +0100 Message-ID: <20260115164250.879366765@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260115164246.225995385@linuxfoundation.org> References: <20260115164246.225995385@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jisheng Zhang [ Upstream commit 2b94b054ac4974ad2f89f7f7461840c851933adb ] dwc2 on most platforms needs phy controller, clock and power supply. All of them must be enabled/activated to properly operate. If dwc2 is configured as peripheral mode, then all the above three hardware resources are disabled at the end of the probe: /* Gadget code manages lowlevel hw on its own */ if (hsotg->dr_mode == USB_DR_MODE_PERIPHERAL) dwc2_lowlevel_hw_disable(hsotg); But the dwc2_suspend() tries to read the dwc2's reg to check whether is_device_mode or not, this would result in hang during suspend if dwc2 is configured as peripheral mode. Fix this hang by bypassing suspend/resume if lowlevel hw isn't enabled. Fixes: 09a75e857790 ("usb: dwc2: refactor common low-level hw code to platform.c") Signed-off-by: Jisheng Zhang Link: https://patch.msgid.link/20251104002503.17158-3-jszhang@kernel.org Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/usb/dwc2/platform.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c index ae2d73c5aa811..c9fa8c3ff425a 100644 --- a/drivers/usb/dwc2/platform.c +++ b/drivers/usb/dwc2/platform.c @@ -669,9 +669,13 @@ static int dwc2_driver_probe(struct platform_device *dev) static int __maybe_unused dwc2_suspend(struct device *dev) { struct dwc2_hsotg *dwc2 = dev_get_drvdata(dev); - bool is_device_mode = dwc2_is_device_mode(dwc2); + bool is_device_mode; int ret = 0; + if (!dwc2->ll_hw_enabled) + return 0; + + is_device_mode = dwc2_is_device_mode(dwc2); if (is_device_mode) dwc2_hsotg_suspend(dwc2); @@ -722,6 +726,9 @@ static int __maybe_unused dwc2_resume(struct device *dev) struct dwc2_hsotg *dwc2 = dev_get_drvdata(dev); int ret = 0; + if (!dwc2->ll_hw_enabled) + return 0; + if (dwc2->phy_off_for_suspend && dwc2->ll_hw_enabled) { ret = __dwc2_lowlevel_hw_enable(dwc2); if (ret) -- 2.51.0