From patchwork Sat Jun 1 09:32:32 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: joswang X-Patchwork-Id: 13682353 Received: from mail-pl1-f178.google.com (mail-pl1-f178.google.com [209.85.214.178]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C85AD6AAD; Sat, 1 Jun 2024 09:32:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.178 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717234359; cv=none; b=hpaZ/ws3gYK4y8t8H41TI04PrXvhydju5dTPG++UIHbQRcHK+RN+6AsuKP7AC0LHH7C1hBldC2j748TgGCKrv2kfs7MFaBRXz8+FziW2OsHnhf5ixvlCG+ihuLSBFh/KN/1aAogLj9wQTTei7Bed/4DEUolYmeAEknXPid7pj/g= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717234359; c=relaxed/simple; bh=8qeuq/9NyK9dd0k3Ody3dB9SOCFgZ5HrBOGAyz4hQwo=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References; b=e15RouO2EVSVxKGZ2XqhXIok4YKQbcFeCQRGxueUhniUR1u/TExvAsQVAdBRc/5wFFM9C80hW67Nn+r/KvlgdJ03sxJcfQzTzY2Ah75IRX8LvmmoHKFFWpCyJnSuP5C6zHYG1+YBaT8cR2idxcEMePkLDDQsWbZ+PT694NMybR0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=VHOLZ8D/; arc=none smtp.client-ip=209.85.214.178 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="VHOLZ8D/" Received: by mail-pl1-f178.google.com with SMTP id d9443c01a7336-1f62fae8c3cso17325205ad.3; Sat, 01 Jun 2024 02:32:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1717234357; x=1717839157; darn=vger.kernel.org; h=references:in-reply-to:message-id:date:subject:cc:to:from:from:to :cc:subject:date:message-id:reply-to; bh=WfDan29VxVHZmK0WASWdz2aN4PE4yQZdFHSJZf8M3Io=; b=VHOLZ8D/0MKfMb5/9DzrnPU4zL+fMrFJPRGS0Y6qh4JeOtR2cJMjwtDR2x16H52DuB LgZuzG+IX0/awRRIBFQhoHO5lzI8zpClqokIZBFUcCW9CsTZu/cHJnnrxWaaIjnXoS2B kCK8M/tSVqQ+buIRmE4aydUALXc8Mi/szGmrJnDAqAYgRSfS47WgtuxheWDBYt7Is380 RqplniEn1zRs4TVbP3vEnmcdEFJq9uiyQgO42d71NLuH38z3m7Xtu27Ee9VIJh+E908x rvZSoQEuKQwzZRiG0FFqiWadXD79YfsmCs6LhpnGM6r8FQhY+sCt/Tx22KPg6IdASiTB UVYQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1717234357; x=1717839157; h=references:in-reply-to:message-id:date:subject:cc:to:from :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=WfDan29VxVHZmK0WASWdz2aN4PE4yQZdFHSJZf8M3Io=; b=sMfo8sAEXFtVhj84AfQWvwOpIrxBRQD18wlDsb1zSMtklMtNstNvOFjjtGLNG1STQi 7D2uxDRq45df/zH9RGs1ryBTHM5FIWap/4vHngaWZ7WeGYbP5f3ghFvdqMtvd1kFjA4a 6ZQGFDkE9sQPXbJS5uWPfpoqqEiPHVtIccbsaydyhWEcbR0ue6vE4l8pA/OmsYTll5p5 RyYaelWP8pZyMdTAyM92YrhV3kys++d0ZR7Or9qYmmRFoYLanWPXfwUMhGifQGHg+Trf dee7OEe/rkKrNrQ0/NP0rBaVjYY7Om0l6MkfnKVMxQAPIYxf14Dl3VEsMV5VOtAUnzkP jLwg== X-Forwarded-Encrypted: i=1; AJvYcCUtU2kTDp4c+Sw7TqLvf43Qu2g0ZjmVHg6top6oaoXPCHFxvhK0OSTRnVOMOCAAVUsJdCDHFDgxqqgHh+IXUz/FQfkvUzCaOQuclTkCq+npgIb1x493s+xClBGIgpeESjknEn/uzg7N X-Gm-Message-State: AOJu0Ywqz+ENoMp4T0cGj1FkXEQl92OgLZEoHVXi9jr7h0KK42kis88N uYPdApCrZjD4meKulfLo/HFDYymOc/XtX9Dhe8yL45WJySoG51lt X-Google-Smtp-Source: AGHT+IF2Y/lvJC2CHSbJ8VM+i+/4AWA1oMbbO9ctIjt+vHM9XrZrC5hZywfN/zjx0YrFt+wiVtSrww== X-Received: by 2002:a17:903:22c3:b0:1f4:bb5c:b7bd with SMTP id d9443c01a7336-1f6370b8aa1mr45185795ad.61.1717234357015; Sat, 01 Jun 2024 02:32:37 -0700 (PDT) Received: from localhost ([219.144.1.218]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-1f6323feaa0sm30271675ad.230.2024.06.01.02.32.36 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Sat, 01 Jun 2024 02:32:36 -0700 (PDT) From: joswang To: Thinh.Nguyen@synopsys.com Cc: gregkh@linuxfoundation.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, joswang Subject: [PATCH 2/2] usb: dwc3: core: Workaround for CSR read timeout Date: Sat, 1 Jun 2024 17:32:32 +0800 Message-Id: <20240601093232.52319-1-joswang1221@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20240601092646.52139-1-joswang1221@gmail.com> References: <20240601092646.52139-1-joswang1221@gmail.com> Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: From: joswang DWC31 version 2.00a have an issue that would cause a CSR read timeout When CSR read coincides with RAM Clock Gating Entry. This workaround solution disable Clock Gating, sacrificing power consumption for normal operation. Signed-off-by: joswang --- drivers/usb/dwc3/core.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index 3a8fbc2d6b99..1df85c505c9e 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -978,11 +978,22 @@ static void dwc3_core_setup_global_control(struct dwc3 *dwc) * * STAR#9000588375: Clock Gating, SOF Issues when ref_clk-Based * SOF/ITP Mode Used + * + * WORKAROUND: DWC31 version 2.00a have an issue that would + * cause a CSR read timeout When CSR read coincides with RAM + * Clock Gating Entry. + * + * This workaround solution disable Clock Gating, sacrificing + * power consumption for normal operation. */ if ((dwc->dr_mode == USB_DR_MODE_HOST || dwc->dr_mode == USB_DR_MODE_OTG) && DWC3_VER_IS_WITHIN(DWC3, 210A, 250A)) reg |= DWC3_GCTL_DSBLCLKGTNG | DWC3_GCTL_SOFITPSYNC; + else if ((dwc->dr_mode == USB_DR_MODE_HOST || + dwc->dr_mode == USB_DR_MODE_OTG) && + DWC3_VER_IS(DWC31, 200A)) + reg |= DWC3_GCTL_DSBLCLKGTNG; else reg &= ~DWC3_GCTL_DSBLCLKGTNG; break; @@ -992,6 +1003,18 @@ static void dwc3_core_setup_global_control(struct dwc3 *dwc) * will work. Device-mode hibernation is not yet implemented. */ reg |= DWC3_GCTL_GBLHIBERNATIONEN; + + /* + * WORKAROUND: DWC31 version 2.00a have an issue that would + * cause a CSR read timeout When CSR read coincides with RAM + * Clock Gating Entry. + * + * This workaround solution disable Clock Gating, sacrificing + * power consumption for normal operation. + */ + if ((dwc->dr_mode == USB_DR_MODE_HOST || + dwc->dr_mode == USB_DR_MODE_OTG) && DWC3_VER_IS(DWC31, 200A)) + reg |= DWC3_GCTL_DSBLCLKGTNG; break; default: /* nothing */