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[2a03:7220:8080:c00::1]) by smtp.gmail.com with ESMTPSA id i76-v6sm285367wmd.20.2018.06.14.14.55.34 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 14 Jun 2018 14:55:35 -0700 (PDT) From: ilia.lin@gmail.com To: ilia.lin@gmail.com Cc: Rajendra Nayak , Ilia Lin , Michael Turquette , Stephen Boyd , Rob Herring , Mark Rutland , Andy Gross , David Brown , Will Deacon , Amit Kucheria , linux-clk@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v13 6/8] clk: qcom: cpu-8996: Add support to switch to alternate PLL Date: Thu, 14 Jun 2018 23:53:53 +0200 Message-Id: <20180614215358.11264-7-ilia.lin@gmail.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20180614215358.11264-1-ilia.lin@gmail.com> References: <20180614215358.11264-1-ilia.lin@gmail.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Rajendra Nayak Each of the CPU clusters on msm8996 are powered via a primary PLL and a secondary PLL. The primary PLL is what drives the CPU clk, except for times when we are reprogramming the PLL itself, when we temporarily switch to an alternate PLL. Use clock rate change notifiers to support this. Signed-off-by: Rajendra Nayak Signed-off-by: Ilia Lin Tested-by: Amit Kucheria --- drivers/clk/qcom/clk-cpu-8996.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/drivers/clk/qcom/clk-cpu-8996.c b/drivers/clk/qcom/clk-cpu-8996.c index d92cad93af20..620fdc2266ba 100644 --- a/drivers/clk/qcom/clk-cpu-8996.c +++ b/drivers/clk/qcom/clk-cpu-8996.c @@ -52,6 +52,7 @@ * detect voltage droops. */ +#include #include #include #include @@ -178,10 +179,14 @@ struct clk_cpu_8996_mux { u32 reg; u8 shift; u8 width; + struct notifier_block nb; struct clk_hw *pll; struct clk_regmap clkr; }; +#define to_clk_cpu_8996_mux_nb(_nb) \ + container_of(_nb, struct clk_cpu_8996_mux, nb) + static inline struct clk_cpu_8996_mux *to_clk_cpu_8996_mux_hw(struct clk_hw *hw) { @@ -227,6 +232,26 @@ clk_cpu_8996_mux_determine_rate(struct clk_hw *hw, struct clk_rate_request *req) return 0; } +int cpu_clk_notifier_cb(struct notifier_block *nb, unsigned long event, + void *data) +{ + int ret; + struct clk_cpu_8996_mux *cpuclk = to_clk_cpu_8996_mux_nb(nb); + + switch (event) { + case PRE_RATE_CHANGE: + ret = clk_cpu_8996_mux_set_parent(&cpuclk->clkr.hw, ALT_INDEX); + break; + case POST_RATE_CHANGE: + ret = clk_cpu_8996_mux_set_parent(&cpuclk->clkr.hw, PLL_INDEX); + break; + default: + ret = 0; + break; + } + + return notifier_from_errno(ret); +}; const struct clk_ops clk_cpu_8996_mux_ops = { .set_parent = clk_cpu_8996_mux_set_parent, .get_parent = clk_cpu_8996_mux_get_parent, @@ -270,6 +295,7 @@ static struct clk_cpu_8996_mux pwrcl_pmux = { .shift = 0, .width = 2, .pll = &pwrcl_pll.clkr.hw, + .nb.notifier_call = cpu_clk_notifier_cb, .clkr.hw.init = &(struct clk_init_data) { .name = "pwrcl_pmux", .parent_names = (const char *[]){ @@ -289,6 +315,7 @@ static struct clk_cpu_8996_mux perfcl_pmux = { .shift = 0, .width = 2, .pll = &perfcl_pll.clkr.hw, + .nb.notifier_call = cpu_clk_notifier_cb, .clkr.hw.init = &(struct clk_init_data) { .name = "perfcl_pmux", .parent_names = (const char *[]){ @@ -347,6 +374,12 @@ qcom_cpu_clk_msm8996_register_clks(struct device *dev, struct regmap *regmap) clk_alpha_pll_configure(&perfcl_alt_pll, regmap, &altpll_config); clk_alpha_pll_configure(&pwrcl_alt_pll, regmap, &altpll_config); + ret = clk_notifier_register(pwrcl_pmux.clkr.hw.clk, &pwrcl_pmux.nb); + if (ret) + return ret; + + ret = clk_notifier_register(perfcl_pmux.clkr.hw.clk, &perfcl_pmux.nb); + return ret; } -- 2.11.0