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Wed, 27 Nov 2024 07:54:01 -0800 (PST) Received: from [127.0.1.1] ([176.61.106.227]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-434aa7d1a90sm24795235e9.32.2024.11.27.07.54.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 27 Nov 2024 07:54:01 -0800 (PST) From: Bryan O'Donoghue Date: Wed, 27 Nov 2024 15:53:56 +0000 Subject: [PATCH v4 3/3] clk: qcom: Support attaching GDSCs to multiple parents Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241127-b4-linux-next-24-11-18-clock-multiple-power-domains-v4-3-4348d40cb635@linaro.org> References: <20241127-b4-linux-next-24-11-18-clock-multiple-power-domains-v4-0-4348d40cb635@linaro.org> In-Reply-To: <20241127-b4-linux-next-24-11-18-clock-multiple-power-domains-v4-0-4348d40cb635@linaro.org> 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 X-Mailer: b4 0.15-dev-355e8 When a clock-controller has multiple power-domains we need to attach parent GDSCs in that clock-controller as subdomains of each of the power-domains. Testing on the x1e80100 reference shows that both power-domains need to be switched on for the GDSCs in the clock-controller to work. Some open questions remain. 1. Should there be a hirearchy of power-domains in the clock-controller. 2. If there should be no hirearchy should the parent GDSC inside the clock-controller attach to each power-domain in the clock-controller. 3. If there are multiple parent GDSCs in a clock-controller do we attach those top-level GDSCs to each controller power-domain. 4. Finally should performance-states be applied equally across those power-domains. It may be if we see more clock-controllers with multiple power-domains that some mixture of these questions will need to be implemented for specific hardware. Right now the approach taken here is to attach the clock-controller GDSC parent to each clock-controller power-domain. Signed-off-by: Bryan O'Donoghue --- drivers/clk/qcom/common.c | 1 + drivers/clk/qcom/gdsc.c | 35 +++++++++++++++++++++++++++++++++++ drivers/clk/qcom/gdsc.h | 1 + 3 files changed, 37 insertions(+) diff --git a/drivers/clk/qcom/common.c b/drivers/clk/qcom/common.c index 7727295c57c8f6672d46d2380e1ff5ec2ac68d42..58a8397eefe51da237a4285d4e7cee967e19948f 100644 --- a/drivers/clk/qcom/common.c +++ b/drivers/clk/qcom/common.c @@ -338,6 +338,7 @@ int qcom_cc_really_probe(struct device *dev, scd->dev = dev; scd->scs = desc->gdscs; scd->num = desc->num_gdscs; + scd->pd_list = cc->pd_list; ret = gdsc_register(scd, &reset->rcdev, regmap); if (ret) return ret; diff --git a/drivers/clk/qcom/gdsc.c b/drivers/clk/qcom/gdsc.c index 4fc6f957d0b846cc90e50ef243f23a7a27e66899..cb4afa6d584899f3dafa380d5e01be6de9711737 100644 --- a/drivers/clk/qcom/gdsc.c +++ b/drivers/clk/qcom/gdsc.c @@ -506,6 +506,36 @@ static int gdsc_init(struct gdsc *sc) return ret; } +static int gdsc_add_subdomain_list(struct dev_pm_domain_list *pd_list, + struct generic_pm_domain *subdomain) +{ + int i, ret; + + for (i = 0; i < pd_list->num_pds; i++) { + struct device *dev = pd_list->pd_devs[i]; + struct generic_pm_domain *genpd = pd_to_genpd(dev->pm_domain); + + ret = pm_genpd_add_subdomain(genpd, subdomain); + if (ret) + return ret; + } + + return 0; +} + +static void gdsc_remove_subdomain_list(struct dev_pm_domain_list *pd_list, + struct generic_pm_domain *subdomain) +{ + int i; + + for (i = 0; i < pd_list->num_pds; i++) { + struct device *dev = pd_list->pd_devs[i]; + struct generic_pm_domain *genpd = pd_to_genpd(dev->pm_domain); + + pm_genpd_remove_subdomain(genpd, subdomain); + } +} + int gdsc_register(struct gdsc_desc *desc, struct reset_controller_dev *rcdev, struct regmap *regmap) { @@ -558,6 +588,9 @@ int gdsc_register(struct gdsc_desc *desc, ret = pm_genpd_add_subdomain(scs[i]->parent, &scs[i]->pd); else if (!IS_ERR_OR_NULL(dev->pm_domain)) ret = pm_genpd_add_subdomain(pd_to_genpd(dev->pm_domain), &scs[i]->pd); + else if (desc->pd_list) + ret = gdsc_add_subdomain_list(desc->pd_list, &scs[i]->pd); + if (ret) return ret; } @@ -580,6 +613,8 @@ void gdsc_unregister(struct gdsc_desc *desc) pm_genpd_remove_subdomain(scs[i]->parent, &scs[i]->pd); else if (!IS_ERR_OR_NULL(dev->pm_domain)) pm_genpd_remove_subdomain(pd_to_genpd(dev->pm_domain), &scs[i]->pd); + else if (desc->pd_list) + gdsc_remove_subdomain_list(desc->pd_list, &scs[i]->pd); } of_genpd_del_provider(dev->of_node); } diff --git a/drivers/clk/qcom/gdsc.h b/drivers/clk/qcom/gdsc.h index 1e2779b823d1c8ca077c9b4cd0a0dbdf5f9457ef..dd843e86c05b2f30e6d9e978681580016333839d 100644 --- a/drivers/clk/qcom/gdsc.h +++ b/drivers/clk/qcom/gdsc.h @@ -80,6 +80,7 @@ struct gdsc_desc { struct device *dev; struct gdsc **scs; size_t num; + struct dev_pm_domain_list *pd_list; }; #ifdef CONFIG_QCOM_GDSC