diff options
Diffstat (limited to 'target/linux/mediatek/patches-5.15/350-13-cpufreq-mediatek-Link-CCI-device-to-CPU.patch')
| -rw-r--r-- | target/linux/mediatek/patches-5.15/350-13-cpufreq-mediatek-Link-CCI-device-to-CPU.patch | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/target/linux/mediatek/patches-5.15/350-13-cpufreq-mediatek-Link-CCI-device-to-CPU.patch b/target/linux/mediatek/patches-5.15/350-13-cpufreq-mediatek-Link-CCI-device-to-CPU.patch new file mode 100644 index 0000000000..eeaa466c32 --- /dev/null +++ b/target/linux/mediatek/patches-5.15/350-13-cpufreq-mediatek-Link-CCI-device-to-CPU.patch @@ -0,0 +1,188 @@ +From 15aaf74fb734a3e69b10d00b97b322711b81e222 Mon Sep 17 00:00:00 2001 +From: Rex-BC Chen <rex-bc.chen@mediatek.com> +Date: Thu, 5 May 2022 19:52:22 +0800 +Subject: [PATCH 13/21] cpufreq: mediatek: Link CCI device to CPU + +In some MediaTek SoCs, like MT8183, CPU and CCI share the same power +supplies. Cpufreq needs to check if CCI devfreq exists and wait until +CCI devfreq ready before scaling frequency. + +Before CCI devfreq is ready, we record the voltage when booting to +kernel and use the max(cpu target voltage, booting voltage) to +prevent cpufreq adjust to the lower voltage which will cause the CCI +crash because of high frequency and low voltage. + +- Add is_ccifreq_ready() to link CCI device to CPI, and CPU will start + DVFS when CCI is ready. +- Add platform data for MT8183. + +Signed-off-by: Jia-Wei Chang <jia-wei.chang@mediatek.com> +Signed-off-by: Rex-BC Chen <rex-bc.chen@mediatek.com> +Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> +Reviewed-by: Kevin Hilman <khilman@baylibre.com> +Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> +--- + drivers/cpufreq/mediatek-cpufreq.c | 82 +++++++++++++++++++++++++++++- + 1 file changed, 81 insertions(+), 1 deletion(-) + +--- a/drivers/cpufreq/mediatek-cpufreq.c ++++ b/drivers/cpufreq/mediatek-cpufreq.c +@@ -22,6 +22,7 @@ struct mtk_cpufreq_platform_data { + int proc_max_volt; + int sram_min_volt; + int sram_max_volt; ++ bool ccifreq_supported; + }; + + /* +@@ -38,6 +39,7 @@ struct mtk_cpufreq_platform_data { + struct mtk_cpu_dvfs_info { + struct cpumask cpus; + struct device *cpu_dev; ++ struct device *cci_dev; + struct regulator *proc_reg; + struct regulator *sram_reg; + struct clk *cpu_clk; +@@ -45,6 +47,7 @@ struct mtk_cpu_dvfs_info { + struct list_head list_head; + int intermediate_voltage; + bool need_voltage_tracking; ++ int vproc_on_boot; + int pre_vproc; + /* Avoid race condition for regulators between notify and policy */ + struct mutex reg_lock; +@@ -53,6 +56,7 @@ struct mtk_cpu_dvfs_info { + unsigned long current_freq; + const struct mtk_cpufreq_platform_data *soc_data; + int vtrack_max; ++ bool ccifreq_bound; + }; + + static struct platform_device *cpufreq_pdev; +@@ -171,6 +175,28 @@ static int mtk_cpufreq_set_voltage(struc + return ret; + } + ++static bool is_ccifreq_ready(struct mtk_cpu_dvfs_info *info) ++{ ++ struct device_link *sup_link; ++ ++ if (info->ccifreq_bound) ++ return true; ++ ++ sup_link = device_link_add(info->cpu_dev, info->cci_dev, ++ DL_FLAG_AUTOREMOVE_CONSUMER); ++ if (!sup_link) { ++ dev_err(info->cpu_dev, "cpu%d: sup_link is NULL\n", info->opp_cpu); ++ return false; ++ } ++ ++ if (sup_link->supplier->links.status != DL_DEV_DRIVER_BOUND) ++ return false; ++ ++ info->ccifreq_bound = true; ++ ++ return true; ++} ++ + static int mtk_cpufreq_set_target(struct cpufreq_policy *policy, + unsigned int index) + { +@@ -213,6 +239,14 @@ static int mtk_cpufreq_set_target(struct + dev_pm_opp_put(opp); + + /* ++ * If MediaTek cci is supported but is not ready, we will use the value ++ * of max(target cpu voltage, booting voltage) to prevent high freqeuncy ++ * low voltage crash. ++ */ ++ if (info->soc_data->ccifreq_supported && !is_ccifreq_ready(info)) ++ vproc = max(vproc, info->vproc_on_boot); ++ ++ /* + * If the new voltage or the intermediate voltage is higher than the + * current voltage, scale up voltage first. + */ +@@ -333,6 +367,23 @@ static int mtk_cpufreq_opp_notifier(stru + return notifier_from_errno(ret); + } + ++static struct device *of_get_cci(struct device *cpu_dev) ++{ ++ struct device_node *np; ++ struct platform_device *pdev; ++ ++ np = of_parse_phandle(cpu_dev->of_node, "mediatek,cci", 0); ++ if (IS_ERR_OR_NULL(np)) ++ return NULL; ++ ++ pdev = of_find_device_by_node(np); ++ of_node_put(np); ++ if (IS_ERR_OR_NULL(pdev)) ++ return NULL; ++ ++ return &pdev->dev; ++} ++ + static int mtk_cpu_dvfs_info_init(struct mtk_cpu_dvfs_info *info, int cpu) + { + struct device *cpu_dev; +@@ -347,6 +398,16 @@ static int mtk_cpu_dvfs_info_init(struct + } + info->cpu_dev = cpu_dev; + ++ info->ccifreq_bound = false; ++ if (info->soc_data->ccifreq_supported) { ++ info->cci_dev = of_get_cci(info->cpu_dev); ++ if (IS_ERR_OR_NULL(info->cci_dev)) { ++ ret = PTR_ERR(info->cci_dev); ++ dev_err(cpu_dev, "cpu%d: failed to get cci device\n", cpu); ++ return -ENODEV; ++ } ++ } ++ + info->cpu_clk = clk_get(cpu_dev, "cpu"); + if (IS_ERR(info->cpu_clk)) { + ret = PTR_ERR(info->cpu_clk); +@@ -410,6 +471,15 @@ static int mtk_cpu_dvfs_info_init(struct + if (ret) + goto out_disable_mux_clock; + ++ if (info->soc_data->ccifreq_supported) { ++ info->vproc_on_boot = regulator_get_voltage(info->proc_reg); ++ if (info->vproc_on_boot < 0) { ++ dev_err(info->cpu_dev, ++ "invalid Vproc value: %d\n", info->vproc_on_boot); ++ goto out_disable_inter_clock; ++ } ++ } ++ + /* Search a safe voltage for intermediate frequency. */ + rate = clk_get_rate(info->inter_clk); + opp = dev_pm_opp_find_freq_ceil(cpu_dev, &rate); +@@ -617,6 +687,16 @@ static const struct mtk_cpufreq_platform + .proc_max_volt = 1150000, + .sram_min_volt = 0, + .sram_max_volt = 1150000, ++ .ccifreq_supported = false, ++}; ++ ++static const struct mtk_cpufreq_platform_data mt8183_platform_data = { ++ .min_volt_shift = 100000, ++ .max_volt_shift = 200000, ++ .proc_max_volt = 1150000, ++ .sram_min_volt = 0, ++ .sram_max_volt = 1150000, ++ .ccifreq_supported = true, + }; + + /* List of machines supported by this driver */ +@@ -629,7 +709,7 @@ static const struct of_device_id mtk_cpu + { .compatible = "mediatek,mt817x", .data = &mt2701_platform_data }, + { .compatible = "mediatek,mt8173", .data = &mt2701_platform_data }, + { .compatible = "mediatek,mt8176", .data = &mt2701_platform_data }, +- { .compatible = "mediatek,mt8183", .data = &mt2701_platform_data }, ++ { .compatible = "mediatek,mt8183", .data = &mt8183_platform_data }, + { .compatible = "mediatek,mt8365", .data = &mt2701_platform_data }, + { .compatible = "mediatek,mt8516", .data = &mt2701_platform_data }, + { } |