69  * AMD Energy Preference Performance (EPP)
70  * The EPP is used in the CCLK DPM controller to drive
72  * short periods of activity. EPP values will be utilized for
74  * display strings corresponding to EPP index in the
127 	u64 epp;  in amd_pstate_get_epp()  local
132 			epp = rdmsrl_on_cpu(cpudata->cpu, MSR_AMD_CPPC_REQ,  in amd_pstate_get_epp()
134 			if (epp)  in amd_pstate_get_epp()
135 				return epp;  in amd_pstate_get_epp()
137 		epp = (cppc_req_cached >> 24) & 0xFF;  in amd_pstate_get_epp()
139 		ret = cppc_get_epp_perf(cpudata->cpu, &epp);  in amd_pstate_get_epp()
146 	return (s16)(epp & 0xff);  in amd_pstate_get_epp()
151 	s16 epp;  in amd_pstate_get_energy_pref_index()  local
154 	epp = amd_pstate_get_epp(cpudata, 0);  in amd_pstate_get_energy_pref_index()
155 	if (epp < 0)  in amd_pstate_get_energy_pref_index()
156 		return epp;  in amd_pstate_get_energy_pref_index()
158 	switch (epp) {  in amd_pstate_get_energy_pref_index()
178 static int amd_pstate_set_epp(struct amd_cpudata *cpudata, u32 epp)  in amd_pstate_set_epp()  argument
187 		value |= (u64)epp << 24;  in amd_pstate_set_epp()
192 			cpudata->epp_cached = epp;  in amd_pstate_set_epp()
194 		perf_ctrls.energy_perf = epp;  in amd_pstate_set_epp()
200 		cpudata->epp_cached = epp;  in amd_pstate_set_epp()
209 	int epp = -EINVAL;  in amd_pstate_set_energy_pref_index()  local
213 		pr_debug("EPP pref_index is invalid\n");  in amd_pstate_set_energy_pref_index()
217 	if (epp == -EINVAL)  in amd_pstate_set_energy_pref_index()
218 		epp = epp_values[pref_index];  in amd_pstate_set_energy_pref_index()
220 	if (epp > 0 && cpudata->policy == CPUFREQ_POLICY_PERFORMANCE) {  in amd_pstate_set_energy_pref_index()
221 		pr_debug("EPP cannot be set under performance policy\n");  in amd_pstate_set_energy_pref_index()
225 	ret = amd_pstate_set_epp(cpudata, epp);  in amd_pstate_set_energy_pref_index()
269 		/* Enable autonomous mode for EPP */  in cppc_enable()
271 			/* Set desired perf as zero to allow EPP firmware control */  in cppc_enable()
1228 	s16 epp;  in amd_pstate_epp_update_limit()  local
1254 	/* CPPC EPP feature require to set zero to the desire perf bit */  in amd_pstate_epp_update_limit()
1260 	/* Get BIOS pre-defined epp value */  in amd_pstate_epp_update_limit()
1261 	epp = amd_pstate_get_epp(cpudata, value);  in amd_pstate_epp_update_limit()
1262 	if (epp < 0) {  in amd_pstate_epp_update_limit()
1265 		 * systems where EPP register read/write not supported.  in amd_pstate_epp_update_limit()
1271 		epp = 0;  in amd_pstate_epp_update_limit()
1273 	/* Set initial EPP value */  in amd_pstate_epp_update_limit()
1276 		value |= (u64)epp << 24;  in amd_pstate_epp_update_limit()
1280 	amd_pstate_set_epp(cpudata, epp);  in amd_pstate_epp_update_limit()
1392 	/* avoid suspending when EPP is not enabled */  in amd_pstate_epp_suspend()
1449 	.name		= "amd-pstate-epp",