From patchwork Tue Nov 26 23:44:26 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bryan O'Donoghue X-Patchwork-Id: 13886432 Received: from mail-wm1-f53.google.com (mail-wm1-f53.google.com [209.85.128.53]) (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 433CD1DFE11 for ; Tue, 26 Nov 2024 23:44:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.53 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732664676; cv=none; b=hktdUfPR2oGdqDoSpeEBHZsC50FiTJ20d/2cwDb1N7t/Cm4k8LYzorZqmu28wbPBAGKBNaDWVnO3KPn71V9osWwgIT2H6pmM0cHyI0Pt79LQVOi0+OLChAiV6g3JlCmFytsqQKquhHtLirJWBPoB816PHqPlxt3ZzZ5V+p/RHGk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732664676; c=relaxed/simple; bh=+fhFM24qdTFklU9m2XwiT7YHYQrJaiSziSmW70rJDQQ=; h=From:Subject:Date:Message-Id:MIME-Version:Content-Type:To:Cc; b=kTcwlgU8fS3pu85/2gQhi59rbtF1Zm65WX3LKnE6yDcudLPvxy0v+fSWEe81ZUbnRImRwpfQ9a0vpPBiBvmYbd9I8T5uKe3uWtiKuVQX3WwOGKVd2hza3QAu3rZrtngT0oImYPMnfwrzXg61B8ihL6XF08XaMBd4W7kXDT/RFJg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org; spf=pass smtp.mailfrom=linaro.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b=oCUdUsoi; arc=none smtp.client-ip=209.85.128.53 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linaro.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="oCUdUsoi" Received: by mail-wm1-f53.google.com with SMTP id 5b1f17b1804b1-434a752140eso9643795e9.3 for ; Tue, 26 Nov 2024 15:44:33 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1732664671; x=1733269471; darn=vger.kernel.org; h=cc:to:content-transfer-encoding:mime-version:message-id:date :subject:from:from:to:cc:subject:date:message-id:reply-to; bh=CJmU59J+M2fvIhoTK/DsvENc1HKmlM36AHXQwtD2KaU=; b=oCUdUsoiFAyrnEu0aLgsolTfbOYpbUFi5xIt9YgPd8pRMrg/3XvGJ5Qg4CacbQg+w5 iWugoTZqjVukKvzJTPnZEbxIzTloML3Cd9zgOT4XF3CBo2LvgRunwCp7k/9D5NmHIBW6 42zKM0ZbUVFvFu35zyJgGxuNdpd/tpRIyOvWsiwnOxKKilUZh5P/C9C3TGovykzUdFQg m6TzK8aUNMiZ825IKMmotSdmiaGig76ctw5AIINf77ybxqXKsxvP0DMdlqSnnMNvzQ8e Hi9x0YHn+knMFQou2YVx3PTL5yUPi6cFDYsP/p+qOkhmanrQ+Bz+O6LJ2XmGvGnQuqqb ratQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1732664671; x=1733269471; h=cc:to:content-transfer-encoding:mime-version:message-id:date :subject:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=CJmU59J+M2fvIhoTK/DsvENc1HKmlM36AHXQwtD2KaU=; b=TwCSZ/9MQ5VTBeqhvJukn+an1XkcYzBchYRpGOz4pNSs+nWDHl/0flNxdJ2puWYEim w8EypJbFrsz8ZCmAwI76HjJgtKHPLt7bOCPplk9a9fhdPP+RYCs/4YTtlgcjTQNh17pa SPIY5T4BqxhqMi7RI9E3trZ8L0Wkx3RpTZ2p2cAobmM1poXIjn2YX3o2O3X5s2MHoDF5 dac/Gow1tyxKyhRMUBqE5DKme0gI9RT//Fl1ZpphepdGWrl9JXRRiy6CNGrdcTLA3by2 YPMM2QVpLXQ00FZ6NxKLuXMhUBllDzRWWDQTd1MqzjGDDUlN82nS8fFwCQmRy3+tw251 +Mrw== X-Gm-Message-State: AOJu0YxbD4jhjr0pmCXndmMgvnOYCqc0NZW1aKOLehRkhD7cNuIBvchh 3W8ivh5YmLZTfXAAx70YXJ47cUsg/TOkpqEm4HgfJ3STqfkdWCH/q/SPd8c2aYhgrclAMXfOHO8 ODA4= X-Gm-Gg: ASbGnctrxwLYbz+91yBeyYMkKdG95Q+nFJnadsQ1arbNlbD0zUWYnF+2vxXWpZWwKtR 2xUSC6VgjyPTS9fYObV8kjE8EqvVmBH0fYr31dRKdnvy7vZPcvwctUR1S+s8HNADuc2MIt4g2gB Mrdl3fBrC9+Ehs771j5Xzm+gf5tVD1ICU5dcmCLvuDCPq29hg2g696zP2hDTu6x5YvHoaG96uoD Fdpc6nQPzWlSvkX/REuz5oyTGwAH/jj0V/kxtjuf7EaJYHwI6YMPFNE7O8= X-Google-Smtp-Source: AGHT+IE8eKTrNeWUzbOE7vIWSLENBWD9fjmEpqowThwTsPT8/dFfLlB5O1ysxqfYmXhLujNL/goltg== X-Received: by 2002:a05:600c:5253:b0:434:9da3:602b with SMTP id 5b1f17b1804b1-434a9dbc410mr8471415e9.5.1732664671287; Tue, 26 Nov 2024 15:44:31 -0800 (PST) Received: from [127.0.1.1] ([176.61.106.227]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3825fafe338sm14482899f8f.33.2024.11.26.15.44.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 26 Nov 2024 15:44:30 -0800 (PST) From: Bryan O'Donoghue Subject: [PATCH v3 0/3] clk: qcom: Add support for multiple power-domains for a clock controller. Date: Tue, 26 Nov 2024 23:44:26 +0000 Message-Id: <20241126-b4-linux-next-24-11-18-clock-multiple-power-domains-v3-0-836dad33521a@linaro.org> Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-B4-Tracking: v=1; b=H4sIAFpdRmcC/6XOwQ6CMBAE0F8hPbvGrm0AT/6H8VDoKhuxJS0gx vDvFk561ePMYd68RKTAFMUhe4lAI0f2LoX9JhN1Y9yVgG3KAneopJQFVApadsMEjqYeUIGUkOq 69fUN7kPbc9cSdP5BAay/G3YRjL6UpbK10mhEWu4CXXha1dM55YZj78NzPTHKpf3PGyXsoMoNV rbAyuzzY5owwW99uIoFHPEDQf0bggkxmnKtlc1J6S9knuc33akzplwBAAA= X-Change-ID: 20241118-b4-linux-next-24-11-18-clock-multiple-power-domains-a5f994dc452a To: Bjorn Andersson , Michael Turquette , Stephen Boyd , Dmitry Baryshkov Cc: linux-arm-msm@vger.kernel.org, linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, Bryan O'Donoghue , stable@vger.kernel.org X-Mailer: b4 0.15-dev-355e8 v3: - Fixes commit log "per which" - Bryan - Link to v2: https://lore.kernel.org/r/20241125-b4-linux-next-24-11-18-clock-multiple-power-domains-v2-0-a5e7554d7e45@linaro.org v2: The main change in this version is Bjorn's pointing out that pm_runtime_* inside of the gdsc_enable/gdsc_disable path would be recursive and cause a lockdep splat. Dmitry alluded to this too. Bjorn pointed to stuff being done lower in the gdsc_register() routine that might be a starting point. I iterated around that idea and came up with patch #3. When a gdsc has no parent and the pd_list is non-NULL then attach that orphan GDSC to the clock controller power-domain list. Existing subdomain code in gdsc_register() will connect the parent GDSCs in the clock-controller to the clock-controller subdomain, the new code here does that same job for a list of power-domains the clock controller depends on. To Dmitry's point about MMCX and MCX dependencies for the registers inside of the clock controller, I have switched off all references in a test dtsi and confirmed that accessing the clock-controller regs themselves isn't required. On the second point I also verified my test branch with lockdep on which was a concern with the pm_domain version of this solution but I wanted to cover it anyway with the new approach for completeness sake. Here's the item-by-item list of changes: - Adds a patch to capture pm_genpd_add_subdomain() result code - Bryan - Changes changelog of second patch to remove singleton and generally to make the commit log easier to understand - Bjorn - Uses demv_pm_domain_attach_list - Vlad - Changes error check to if (ret < 0 && ret != -EEXIST) - Vlad - Retains passing &pd_data instead of NULL - because NULL doesn't do the same thing - Bryan/Vlad - Retains standalone function qcom_cc_pds_attach() because the pd_data enumeration looks neater in a standalone function - Bryan/Vlad - Drops pm_runtime in favour of gdsc_add_subdomain_list() for each power-domain in the pd_list. The pd_list will be whatever is pointed to by power-domains = <> in the dtsi - Bjorn - Link to v1: https://lore.kernel.org/r/20241118-b4-linux-next-24-11-18-clock-multiple-power-domains-v1-0-b7a2bd82ba37@linaro.org v1: On x1e80100 and it's SKUs the Camera Clock Controller - CAMCC has multiple power-domains which power it. Usually with a single power-domain the core platform code will automatically switch on the singleton power-domain for you. If you have multiple power-domains for a device, in this case the clock controller, you need to switch those power-domains on/off yourself. The clock controllers can also contain Global Distributed Switch Controllers - GDSCs which themselves can be referenced from dtsi nodes ultimately triggering a gdsc_en() in drivers/clk/qcom/gdsc.c. As an example: cci0: cci@ac4a000 { power-domains = <&camcc TITAN_TOP_GDSC>; }; This series adds the support to attach a power-domain list to the clock-controllers and the GDSCs those controllers provide so that in the case of the above example gdsc_toggle_logic() will trigger the power-domain list with pm_runtime_resume_and_get() and pm_runtime_put_sync() respectively. Signed-off-by: Bryan O'Donoghue --- Bryan O'Donoghue (3): clk: qcom: gdsc: Capture pm_genpd_add_subdomain result code clk: qcom: common: Add support for power-domain attachment driver: clk: qcom: Support attaching subdomain list to multiple parents drivers/clk/qcom/common.c | 21 +++++++++++++++++++++ drivers/clk/qcom/gdsc.c | 41 +++++++++++++++++++++++++++++++++++++++-- drivers/clk/qcom/gdsc.h | 1 + 3 files changed, 61 insertions(+), 2 deletions(-) --- base-commit: 744cf71b8bdfcdd77aaf58395e068b7457634b2c change-id: 20241118-b4-linux-next-24-11-18-clock-multiple-power-domains-a5f994dc452a Best regards,