From patchwork Thu Apr 18 15:51:51 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vitor Soares X-Patchwork-Id: 13635032 Received: from mail-wm1-f42.google.com (mail-wm1-f42.google.com [209.85.128.42]) (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 ED27B16EBE1; Thu, 18 Apr 2024 15:52:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.42 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713455530; cv=none; b=AZeq/3Q2kaOFQGqO6I8eKee60d3NaQwLEt88GWgICcRIvSA1Sl/BYnRjv7zh3RtsTy5iESyeYujaOzIuHKEr4cxGIUVSw7+rnQjBWHtEfbUnK3l0Au2XOuz+Opraw8Gz/oS3wBPi0IvTps41f2yAh8t3l40WLVHQ6f2jSCappyA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713455530; c=relaxed/simple; bh=wFnbcWy5gk5sXW+5zvt0NargWqewhsVtKQ7Weekss4g=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=L39thU4zx6BpflSR+bMJd+DaLAI6IYpSlDPaZMbsAfQpLek0Me+2fVZTYmTsKB56KxkHm/L4LJjdchtZ3CXwUADfxuJ57x0WNP/+FfB/bPh+BxrTJ0IFISe6UWAT6CKzhw+W/vYodpIAOTYwSBumjZRSi83HPCsBNKX0ZJ/AOjI= 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=gQWwmmPH; arc=none smtp.client-ip=209.85.128.42 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="gQWwmmPH" Received: by mail-wm1-f42.google.com with SMTP id 5b1f17b1804b1-416a8ec0239so6408355e9.0; Thu, 18 Apr 2024 08:52:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1713455526; x=1714060326; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=WPBZ9ExHuwu+bu/mp1K2y+evtVoXz/i7anIOf+mTPDM=; b=gQWwmmPH1uWnTyO1OWY3UhpPR/xTuH864OmjPShFuK6zQ8OADlA4rvnDcQFTE2G4KD nvno1Z/mCEDoYsiUlcBYJFfX+leELAcHUKEz/X4Cl1ezwPQ4NSKBINQYAdLow8IfjIaT Rg0g0yzlp5U/VxpS0Xfox6sArLeNDvia/ft8dgLnZAcw/Jdmam/uWV+u0Ad45TjcpBwf DsIOgDtxRvsYDy6bwWojPmZ1jM/YYOAFzvmDAMAaMRZuFHjnofh4livsJ+aWEg/0R7ZA QwaZI9ImQebR4SCFYKVKZT8fHrabZZSe3uGuqi0S9GFgTokklFeOPn1SYXDwVl24AlUV uhzg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1713455526; x=1714060326; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=WPBZ9ExHuwu+bu/mp1K2y+evtVoXz/i7anIOf+mTPDM=; b=AK8FfJUe1wF2u/nBXruwVvqIVeeAptc41RmkBFktwFHU2pmYpgOU6PJkov7lJt4LlU RcHrXxShinzqo034ReX9oFGWS6sGdzUu+zBMfqQ0eUdCcKY0fgwMtP2glHdMVHOtfh7q 4HiMah0PU0b/C3/KhVol+Yw1ohhx9WFE2Z8JoP8Mu/9o4bYC8GV5PFqt0K/4f3LuHfp9 Va4oRQUH/qbcOttmQW9apSul/btyuIrIIE3h2jJXWjhcpjQejhY3WEEyF6CXHbmS2PLK 42oYks0PAokfn74Jk3SD1XSNNKLO/t3WaGvvBMwLV1ET8XV+4ANrzPv5YK2EdsB0Iacr kR+w== X-Forwarded-Encrypted: i=1; AJvYcCWhkSiwWU4PbQRQR8ReMYy+7ckSoMUQYOyZr6E3Rc9DtDG10PLKhcbB4+ASZUpLkegEfSMOREXSHj1ysLlgXDco7Chb2EPCi8KvL6i0rmxiR0zK0qVUFj2j3T+i25zuxlsEs78EFJyOFcJpL1lzc3Url/vdQq6Z1k0gAi11aeY= X-Gm-Message-State: AOJu0Yy3dhayejxhNlOrk3be717OU14ZPUYw6bn87l4hYMa4SIZxILEe xt4Ew5XvGBtSEaFr7dh4ag9S76pZmqFRS0TonLTb46sl6DA3NYuP X-Google-Smtp-Source: AGHT+IFSm2+nTTTBh/s5wnJ18wP/8/m9M0ecQsavX8QpbNXPEQlYhBTSMGaOPCVh/XJ7vaSK6GL7IQ== X-Received: by 2002:a05:600c:4e09:b0:418:f219:6e22 with SMTP id b9-20020a05600c4e0900b00418f2196e22mr1182984wmq.11.1713455526019; Thu, 18 Apr 2024 08:52:06 -0700 (PDT) Received: from vitor-nb.. ([2001:8a0:e622:f700:cffe:40a8:31d4:2e61]) by smtp.gmail.com with ESMTPSA id o30-20020adfa11e000000b00341b7d5054bsm2168202wro.72.2024.04.18.08.52.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 18 Apr 2024 08:52:05 -0700 (PDT) From: Vitor Soares To: Ulf Hansson , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam Cc: Vitor Soares , linux-pm@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, ivitro@gmail.com, stable@vger.kernel.org, Lucas Stach Subject: [PATCH v1] pmdomain: imx8m-blk-ctrl: fix suspend/resume order Date: Thu, 18 Apr 2024 16:51:51 +0100 Message-Id: <20240418155151.355133-1-ivitro@gmail.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Vitor Soares During the probe, the genpd power_dev is added to the dpm_list after blk_ctrl due to its parent/child relationship. Making the blk_ctrl suspend after and resume before the genpd power_dev. As a consequence, the system hangs when resuming the VPU due to the power domain dependency. To ensure the proper suspend/resume order, add a device link betweem blk_ctrl and genpd power_dev. It guarantees genpd power_dev is suspended after and resumed before blk-ctrl. Cc: Closes: https://lore.kernel.org/all/fccbb040330a706a4f7b34875db1d896a0bf81c8.camel@gmail.com/ Link: https://lore.kernel.org/all/20240409085802.290439-1-ivitro@gmail.com/ Fixes: 2684ac05a8c4 ("soc: imx: add i.MX8M blk-ctrl driver") Suggested-by: Lucas Stach Signed-off-by: Vitor Soares Reviewed-by: Lucas Stach --- This is a new patch, but is a follow-up of: https://lore.kernel.org/all/20240409085802.290439-1-ivitro@gmail.com/ As suggested by Lucas, we are addressing this PM issue in the imx8m-blk-ctrl driver instead of in the imx8mm.dtsi. drivers/pmdomain/imx/imx8m-blk-ctrl.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/pmdomain/imx/imx8m-blk-ctrl.c b/drivers/pmdomain/imx/imx8m-blk-ctrl.c index ca942d7929c2..cd0d2296080d 100644 --- a/drivers/pmdomain/imx/imx8m-blk-ctrl.c +++ b/drivers/pmdomain/imx/imx8m-blk-ctrl.c @@ -283,6 +283,20 @@ static int imx8m_blk_ctrl_probe(struct platform_device *pdev) goto cleanup_pds; } + /* + * Enforce suspend/resume ordering by making genpd power_dev a + * provider of blk-ctrl. Genpd power_dev is suspended after and + * resumed before blk-ctrl. + */ + if (!device_link_add(dev, domain->power_dev, DL_FLAG_STATELESS)) { + ret = -EINVAL; + dev_err_probe(dev, ret, + "failed to link to %s\n", data->name); + pm_genpd_remove(&domain->genpd); + dev_pm_domain_detach(domain->power_dev, true); + goto cleanup_pds; + } + /* * We use runtime PM to trigger power on/off of the upstream GPC * domain, as a strict hierarchical parent/child power domain @@ -324,6 +338,7 @@ static int imx8m_blk_ctrl_probe(struct platform_device *pdev) of_genpd_del_provider(dev->of_node); cleanup_pds: for (i--; i >= 0; i--) { + device_link_remove(dev, bc->domains[i].power_dev); pm_genpd_remove(&bc->domains[i].genpd); dev_pm_domain_detach(bc->domains[i].power_dev, true); } @@ -343,6 +358,7 @@ static void imx8m_blk_ctrl_remove(struct platform_device *pdev) for (i = 0; bc->onecell_data.num_domains; i++) { struct imx8m_blk_ctrl_domain *domain = &bc->domains[i]; + device_link_remove(&pdev->dev, domain->power_dev); pm_genpd_remove(&domain->genpd); dev_pm_domain_detach(domain->power_dev, true); }