From nobody Thu Nov 28 11:38:36 2024 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 224601C5782; Tue, 1 Oct 2024 15:12:24 +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=1727795545; cv=none; b=J3k7cVXB0tjq6SQSVrw5Xf1jWClURgJPxPytafDaNvs7p7eVpvXySHAtwvyZj8zFsraZzWC0A3kI2YuU1QAKWmeoM/kKLRZ3NSKFX1URoVZOVzdWoZeGSmJRnSflRvS7jWdo3GdPa4UiNZiqdPV8q5afoE4LWLwLSth24iJKhWg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727795545; c=relaxed/simple; bh=vOb2cBg3YKOeU1ZQj9lyC4Y3LiyaLbKnBFaVZsWE8tU=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:To:Cc; b=efReEvhenN6yW4bXJmJIIdgZBu923tfbZVlgcEfode4D2Hb9VSwcmm3ddxdDP7i+FNmg0uabwjLhc3+bbg+pdzY1osQcSb6IfKkkBAGaxWB0wfrxJDUCmOzXMDukfza+8ZxvDEMJt6zjvn0GIWwofO6+YbQ1/+xlwOKRt+KKR9s= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=GhXZBah1; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="GhXZBah1" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E2C3CC4CEC6; Tue, 1 Oct 2024 15:12:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1727795544; bh=vOb2cBg3YKOeU1ZQj9lyC4Y3LiyaLbKnBFaVZsWE8tU=; h=From:Date:Subject:To:Cc:From; b=GhXZBah1Y6sKXkPJI7tFDxk20ayMPtxsnaNyUwQeoVsKfqciNGf3JYQKHL7WGbOoG E+JIbvZcF6g0ido/TbG24JklHmVPopw0iuZ8sMbADdQlsBFUpWyWt7zlbZDsgkXZLX u69IvToo3r30hSgP+lhik7L/DGTzfPCpqELVAIByURdU698WQMxQm7WiGX0VseyC/e BlUBl7s17UKGtZw82x0GdjBKVENNfjQ0FKJbu2WS7QiWYv3faisL8A+E6BcqJRGBzC KWbFSRV3pcweX59QdzEowGU0MiZAua6SSrtvUaBXvhauK0FIlDi8Nt9Ck/1Jx9Kfir 23JK5jbUiDa9Q== From: Roger Quadros Date: Tue, 01 Oct 2024 18:12:18 +0300 Subject: [PATCH] usb: dwc3: core: Fix system suspend on TI AM62 platforms Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20241001-am62-lpm-usb-v1-1-9916b71165f7@kernel.org> X-B4-Tracking: v=1; b=H4sIAFER/GYC/6tWKk4tykwtVrJSqFYqSi3LLM7MzwNyDHUUlJIzE vPSU3UzU4B8JSMDIxMDSyNj3cRcMyPdnIJc3dLiJN00EyMDS0PzpBRzA3MloJaCotS0zAqwcdG xtbUAp0RjS14AAAA= To: "Rafael J. Wysocki" , Len Brown , Pavel Machek , Greg Kroah-Hartman , Nishanth Menon , Tero Kristo , Santosh Shilimkar , Thinh Nguyen Cc: Dhruva Gole , Vishal Mahaveer , msp@baylibre.com, srk@ti.com, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-usb@vger.kernel.org, stable@vger.kernel.org, Roger Quadros X-Mailer: b4 0.14.1 X-Developer-Signature: v=1; a=openpgp-sha256; l=3335; i=rogerq@kernel.org; h=from:subject:message-id; bh=vOb2cBg3YKOeU1ZQj9lyC4Y3LiyaLbKnBFaVZsWE8tU=; b=owEBbQKS/ZANAwAIAdJaa9O+djCTAcsmYgBm/BFUmouOCKLwG6BHWujLlPbceU+uDh1JXzuaN T5ReiYdaGeJAjMEAAEIAB0WIQRBIWXUTJ9SeA+rEFjSWmvTvnYwkwUCZvwRVAAKCRDSWmvTvnYw k+9iEADHF+B7kkPnLXj5BsQ6N26i2Onk+8W6BI9VD6ucCARaZaNEOAxf+PHo+mo0srj2T3ad+C4 eWghHfB0UrOK9uSQ6vW+pGxJFVJttdgx2o+QPMMrQiyVK6vnZ2YMGI8WgPE/EndyWClyuVLCB0Z cdihhJWLOObontSlsdwbjCNTjGMIjdgzSCFMH9x7fFE+ypmXHbJxvaNDH7XwqOMANfjS32db925 isHnZvzNcrdJ5lD4IR3HXq2qK+aN2ln6AThY6EVi2qeEd8Db2vZSq6W30BzTjsLLY7Rg2/4qlHz HTQGgHye1in1Yvk4y0D2W6Yr532LcFz0GmlhTt7u4xAKnxkb8dmuNezTsZTUcJpKt7jFP/kJSby eGuykYnZHzKANbAuzBjipu18wYPgNa4hi8zfsyOAyJM15L2MLoK4sEnnkBZTmO/c0UzypUQZUNQ yiokqis4ws4QC4g6XeH3u5awmFEhaKsepnpQyTcsYTuQ6W60Ir8z477YAVEJVSTRJS3dFe+HUyC E6fdGtfrKK6h+Ey7uL0dqxR172US/ToOURzaZLVtzQOQUUkrkCOC4qWUiOZlCiC0vj1/v1sKPRv VbXY0Y3easAjSPRIbur2BAPFqzfQ2mdicU1RxXcqg5hcmqI7LJ9WX9/pD6NBE+UBnCbF+GbTesJ UE802tTXBsx4Rvg== X-Developer-Key: i=rogerq@kernel.org; a=openpgp; fpr=412165D44C9F52780FAB1058D25A6BD3BE763093 Since commit 6d735722063a ("usb: dwc3: core: Prevent phy suspend during ini= t"), system suspend is broken on AM62 TI platforms. Before that commit, both DWC3_GUSB3PIPECTL_SUSPHY and DWC3_GUSB2PHYCFG_SUSP= HY bits (hence forth called 2 SUSPHY bits) were being set during core initialization and even during core re-initialization after a system suspend/resume. These bits are required to be set for system suspend/resume to work correct= ly on AM62 platforms. Since that commit, the 2 SUSPHY bits are not set for DEVICE/OTG mode if gad= get driver is not loaded and started. For Host mode, the 2 SUSPHY bits are set before the first system suspend but get cleared at system resume during core re-init and are never set again. This patch resovles these two issues by ensuring the 2 SUSPHY bits are set before system suspend and restored to the original state during system resu= me. Cc: stable@vger.kernel.org # v6.9+ Fixes: 6d735722063a ("usb: dwc3: core: Prevent phy suspend during init") Link: https://lore.kernel.org/all/1519dbe7-73b6-4afc-bfe3-23f4f75d772f@kern= el.org/ Signed-off-by: Roger Quadros --- drivers/usb/dwc3/core.c | 16 ++++++++++++++++ drivers/usb/dwc3/core.h | 2 ++ 2 files changed, 18 insertions(+) diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index 9eb085f359ce..1233922d4d54 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -2336,6 +2336,9 @@ static int dwc3_suspend_common(struct dwc3 *dwc, pm_m= essage_t msg) u32 reg; int i; =20 + dwc->susphy_state =3D !!(dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0)) & + DWC3_GUSB2PHYCFG_SUSPHY); + switch (dwc->current_dr_role) { case DWC3_GCTL_PRTCAP_DEVICE: if (pm_runtime_suspended(dwc->dev)) @@ -2387,6 +2390,11 @@ static int dwc3_suspend_common(struct dwc3 *dwc, pm_= message_t msg) break; } =20 + if (!PMSG_IS_AUTO(msg)) { + if (!dwc->susphy_state) + dwc3_enable_susphy(dwc, true); + } + return 0; } =20 @@ -2454,6 +2462,14 @@ static int dwc3_resume_common(struct dwc3 *dwc, pm_m= essage_t msg) break; } =20 + if (!PMSG_IS_AUTO(msg)) { + /* dwc3_core_init_for_resume() disables SUSPHY so just handle + * the enable case + */ + if (dwc->susphy_state) + dwc3_enable_susphy(dwc, true); + } + return 0; } =20 diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h index c71240e8f7c7..b2ed5aba4c72 100644 --- a/drivers/usb/dwc3/core.h +++ b/drivers/usb/dwc3/core.h @@ -1150,6 +1150,7 @@ struct dwc3_scratchpad_array { * @sys_wakeup: set if the device may do system wakeup. * @wakeup_configured: set if the device is configured for remote wakeup. * @suspended: set to track suspend event due to U3/L2. + * @susphy_state: state of DWC3_GUSB2PHYCFG_SUSPHY before PM suspend. * @imod_interval: set the interrupt moderation interval in 250ns * increments or 0 to disable. * @max_cfg_eps: current max number of IN eps used across all USB configs. @@ -1382,6 +1383,7 @@ struct dwc3 { unsigned sys_wakeup:1; unsigned wakeup_configured:1; unsigned suspended:1; + unsigned susphy_state:1; =20 u16 imod_interval; =20 --- base-commit: 9852d85ec9d492ebef56dc5f229416c925758edc change-id: 20240923-am62-lpm-usb-f420917bd707 Best regards, --=20 Roger Quadros