27  * Mediatek SoCs has two voltage inputs, Vproc and Vsram. In some cases the two
29  * 100mV < Vsram - Vproc < 200mV
68 	int old_vproc, old_vsram, new_vsram, vsram, vproc, ret;  in mtk_cpufreq_voltage_tracking()  local
72 		pr_err("%s: invalid Vproc value: %d\n", __func__, old_vproc);  in mtk_cpufreq_voltage_tracking()
80 		 * When scaling up voltages, Vsram and Vproc scale up step  in mtk_cpufreq_voltage_tracking()
81 		 * by step. At each step, set Vsram to (Vproc + 200mV) first,  in mtk_cpufreq_voltage_tracking()
82 		 * then set Vproc to (Vsram - 100mV).  in mtk_cpufreq_voltage_tracking()
83 		 * Keep doing it until Vsram and Vproc hit target voltages.  in mtk_cpufreq_voltage_tracking()
94 				pr_err("%s: invalid Vproc value: %d\n",  in mtk_cpufreq_voltage_tracking()
115 				vproc = new_vproc;  in mtk_cpufreq_voltage_tracking()
120 				vproc = vsram - MIN_VOLT_SHIFT;  in mtk_cpufreq_voltage_tracking()
125 			ret = regulator_set_voltage(proc_reg, vproc,  in mtk_cpufreq_voltage_tracking()
126 						    vproc + VOLT_TOL);  in mtk_cpufreq_voltage_tracking()
132 		} while (vproc < new_vproc || vsram < new_vsram);  in mtk_cpufreq_voltage_tracking()
135 		 * When scaling down voltages, Vsram and Vproc scale down step  in mtk_cpufreq_voltage_tracking()
136 		 * by step. At each step, set Vproc to (Vsram - 200mV) first,  in mtk_cpufreq_voltage_tracking()
137 		 * then set Vproc to (Vproc + 100mV).  in mtk_cpufreq_voltage_tracking()
138 		 * Keep doing it until Vsram and Vproc hit target voltages.  in mtk_cpufreq_voltage_tracking()
143 				pr_err("%s: invalid Vproc value: %d\n",  in mtk_cpufreq_voltage_tracking()
154 			vproc = max(new_vproc, old_vsram - MAX_VOLT_SHIFT);  in mtk_cpufreq_voltage_tracking()
155 			ret = regulator_set_voltage(proc_reg, vproc,  in mtk_cpufreq_voltage_tracking()
156 						    vproc + VOLT_TOL);  in mtk_cpufreq_voltage_tracking()
160 			if (vproc == new_vproc)  in mtk_cpufreq_voltage_tracking()
163 				vsram = max(new_vsram, vproc + MIN_VOLT_SHIFT);  in mtk_cpufreq_voltage_tracking()
188 		} while (vproc > new_vproc + VOLT_TOL ||  in mtk_cpufreq_voltage_tracking()
195 static int mtk_cpufreq_set_voltage(struct mtk_cpu_dvfs_info *info, int vproc)  in mtk_cpufreq_set_voltage()  argument
198 		return mtk_cpufreq_voltage_tracking(info, vproc);  in mtk_cpufreq_set_voltage()
200 		return regulator_set_voltage(info->proc_reg, vproc,  in mtk_cpufreq_set_voltage()
201 					     vproc + VOLT_TOL);  in mtk_cpufreq_set_voltage()
214 	int vproc, old_vproc, inter_vproc, target_vproc, ret;  in mtk_cpufreq_set_target()  local
221 		pr_err("%s: invalid Vproc value: %d\n", __func__, old_vproc);  in mtk_cpufreq_set_target()
233 	vproc = dev_pm_opp_get_voltage(opp);  in mtk_cpufreq_set_target()
240 	target_vproc = (inter_vproc > vproc) ? inter_vproc : vproc;  in mtk_cpufreq_set_target()
285 	if (vproc < inter_vproc || vproc < old_vproc) {  in mtk_cpufreq_set_target()
286 		ret = mtk_cpufreq_set_voltage(info, vproc);  in mtk_cpufreq_set_target()