From patchwork Wed Jun 28 10:56:50 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Abel Vesa X-Patchwork-Id: 698087 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9D197EB64DC for ; Wed, 28 Jun 2023 10:57:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231467AbjF1K50 (ORCPT ); Wed, 28 Jun 2023 06:57:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60614 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230361AbjF1K5A (ORCPT ); Wed, 28 Jun 2023 06:57:00 -0400 Received: from mail-ej1-x631.google.com (mail-ej1-x631.google.com [IPv6:2a00:1450:4864:20::631]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 250B710F8 for ; Wed, 28 Jun 2023 03:56:58 -0700 (PDT) Received: by mail-ej1-x631.google.com with SMTP id a640c23a62f3a-9923833737eso167138466b.3 for ; Wed, 28 Jun 2023 03:56:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1687949816; x=1690541816; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=mTQsoS+h53Vzzjs8qIkqE4wzhWloV1Y4NhbaPd70qbM=; b=Fb/Wu62fN9GstdwqxVGC9NlOLfqSqYunhCsHpNEsTngqJ05R6sbGO6EgkSCfC1O1KU Rp5DtAcNNhomPtbP1F/Zlc6CnHdUmNlh43TqMavwb4JcwmLgkdunqhQ0gF/HLPBhtVFb pQ871BCyLXXhg7YbABeh4F6v8gJC29AbEIBjudezHIKkQe8dNPVq5CHfZvMCEecowkkH bjfUdhjAoQgIcZ2FFoHdXJSNDylD2m2FdTquenR3st8z29J2qkgYZsDyTY0Y1o2zTc17 9t9x5vI0OEr6WZZEcF1tU02KQ9kr27Ma1nPLTLfrqipHihWq6LHtMQWFjCEIqfFW4MGA 7RkQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1687949816; x=1690541816; 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=mTQsoS+h53Vzzjs8qIkqE4wzhWloV1Y4NhbaPd70qbM=; b=Cbcxdea4Ptmfb3XM6QkRRVsgyCfKgyZst9S6J8Smx0BOX+hdggD8l+d4Nt+aMYRTrL 55Jn5IzSr0+4HA1YREVfjzuD66BaTYBjVTfgfKrTcT0kblPnkC6Jb78iHDQfMHQfRyue 4uo9kq65q1KnbaoiwJL8PdduzDxUL89xerCKdJPtPg6dR7wf3Oqsi9Pg/VxZ8+YQJ8x1 9axrWRONRPOyk7dYBPG2fPVkP2DtlunwqNnO5XafpXjmKPGnAypEjg6YheBOnTfU7mrP 5dKG/ZrYbLvuJcDQ6DB9JlkQ8BkLP7uCH7xsjM9L6wPAkQsVvcztOmn65zIriEY31rRd hzJw== X-Gm-Message-State: AC+VfDya0VKnghjYOIQxVT0Lqm0BBxGAFq8HSiAsWQ7fpwJPg32NZlaK AI1clHxsUUgmqQxNLWcLmkg7Rw== X-Google-Smtp-Source: ACHHUZ7Ck01xIBnrG3uP6P5tN/Jm9n8V/n4BxNQUecjRP3n5noyncuJBJMg954rqH4xX5H0F8x01hg== X-Received: by 2002:a17:907:7291:b0:98d:d26c:e142 with SMTP id dt17-20020a170907729100b0098dd26ce142mr11584981ejc.46.1687949816608; Wed, 28 Jun 2023 03:56:56 -0700 (PDT) Received: from hackbox.lan ([62.231.110.100]) by smtp.gmail.com with ESMTPSA id e8-20020a1709062c0800b0098921e1b064sm5544678ejh.181.2023.06.28.03.56.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 28 Jun 2023 03:56:56 -0700 (PDT) From: Abel Vesa To: "Rafael J . Wysocki" , Kevin Hilman , Ulf Hansson , avel Machek , Len Brown , Greg Kroah-Hartman , Bjorn Andersson , Andy Gross , Konrad Dybcio , Mike Turquette , Stephen Boyd , Taniya Das Cc: linux-pm@vger.kernel.org, Linux Kernel Mailing List , linux-arm-msm@vger.kernel.org Subject: [PATCH 0/2] PM: domains: Add control for switching back and forth to HW control Date: Wed, 28 Jun 2023 13:56:50 +0300 Message-Id: <20230628105652.1670316-1-abel.vesa@linaro.org> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org This is just a resend of [1]. This resend just adds the back story behind the need for such a generic API as a cover letter. Also added my SoB tag to Ulf's patch. Some of the newer Qualcomm platforms support handing of the control of some of the GDSCs (implemented as power domains in Linux) to some device firmware. The idea behind such approach is that the firmware knows best when such a power domain can be powered off or not and leads most of the time to better power consumption. At this point, if such GDSC provides HW control support, the current implementation is switching to HW control right after the GDSC gets powered on and it is left in HW control mode until right before the request for power off is done. This needs to remain as is for now, as we do not know for sure what each firmware expects from its related GDSCs. For example, the venus driver expects the codec GDSCs to remain always in HW control mode, otherwise the firmware would crush. But in some cases, the consumer driver needs to switch back and forth. And the explanation for such case is when a driver needs to interract with the device (e.g. reading status bits) and the firmware doesn't guarantee the GDSC will be enabled when in HW mode. Therefore, the consumer would need to switch back to SW mode, do its thing, and then switch again back to HW mode. This is where the patch from Ulf comes in. It allows consumers that actually need to control the HW/SW mode to do so. The GDSC patch just implemets the set_hwmode op and sets it for each GDSC that provides HW control mode. [1] https://lore.kernel.org/all/20230627104033.3345659-1-abel.vesa@linaro.org/ Abel Vesa (1): clk: qcom: gdsc: Add support for set_hwmode_dev Ulf Hansson (1): PM: domains: Allow devices attached to genpd to be managed by HW drivers/base/power/domain.c | 66 +++++++++++++++++++++++++++++++++++++ drivers/clk/qcom/gdsc.c | 22 +++++++++++++ include/linux/pm_domain.h | 15 +++++++++ 3 files changed, 103 insertions(+)