92  * AMD Energy Preference Performance (EPP)
93  * The EPP is used in the CCLK DPM controller to drive
95  * short periods of activity. EPP values will be utilized for
97  * display strings corresponding to EPP index in the
185 	u64 epp;  in amd_pstate_get_epp()  local
190 			epp = rdmsrl_on_cpu(cpudata->cpu, MSR_AMD_CPPC_REQ,  in amd_pstate_get_epp()
192 			if (epp)  in amd_pstate_get_epp()
193 				return epp;  in amd_pstate_get_epp()
195 		epp = (cppc_req_cached >> 24) & 0xFF;  in amd_pstate_get_epp()
197 		ret = cppc_get_epp_perf(cpudata->cpu, &epp);  in amd_pstate_get_epp()
204 	return (s16)(epp & 0xff);  in amd_pstate_get_epp()
209 	s16 epp;  in amd_pstate_get_energy_pref_index()  local
212 	epp = amd_pstate_get_epp(cpudata, 0);  in amd_pstate_get_energy_pref_index()
213 	if (epp < 0)  in amd_pstate_get_energy_pref_index()
214 		return epp;  in amd_pstate_get_energy_pref_index()
216 	switch (epp) {  in amd_pstate_get_energy_pref_index()
256 static int amd_pstate_set_epp(struct amd_cpudata *cpudata, u32 epp)  in amd_pstate_set_epp()  argument
265 		value |= (u64)epp << 24;  in amd_pstate_set_epp()
270 			cpudata->epp_cached = epp;  in amd_pstate_set_epp()
275 		perf_ctrls.energy_perf = epp;  in amd_pstate_set_epp()
281 		cpudata->epp_cached = epp;  in amd_pstate_set_epp()
290 	int epp = -EINVAL;  in amd_pstate_set_energy_pref_index()  local
294 		epp = cpudata->epp_default;  in amd_pstate_set_energy_pref_index()
296 	if (epp == -EINVAL)  in amd_pstate_set_energy_pref_index()
297 		epp = epp_values[pref_index];  in amd_pstate_set_energy_pref_index()
299 	if (epp > 0 && cpudata->policy == CPUFREQ_POLICY_PERFORMANCE) {  in amd_pstate_set_energy_pref_index()
300 		pr_debug("EPP cannot be set under performance policy\n");  in amd_pstate_set_energy_pref_index()
304 	ret = amd_pstate_set_epp(cpudata, epp);  in amd_pstate_set_energy_pref_index()
348 		/* Enable autonomous mode for EPP */  in cppc_enable()
350 			/* Set desired perf as zero to allow EPP firmware control */  in cppc_enable()
1512 	s16 epp;  in amd_pstate_epp_update_limit()  local
1547 	/* CPPC EPP feature require to set zero to the desire perf bit */  in amd_pstate_epp_update_limit()
1553 	/* Get BIOS pre-defined epp value */  in amd_pstate_epp_update_limit()
1554 	epp = amd_pstate_get_epp(cpudata, value);  in amd_pstate_epp_update_limit()
1555 	if (epp < 0) {  in amd_pstate_epp_update_limit()
1558 		 * systems where EPP register read/write not supported.  in amd_pstate_epp_update_limit()
1560 		return epp;  in amd_pstate_epp_update_limit()
1564 		epp = 0;  in amd_pstate_epp_update_limit()
1566 	/* Set initial EPP value */  in amd_pstate_epp_update_limit()
1569 		value |= (u64)epp << 24;  in amd_pstate_epp_update_limit()
1573 	return amd_pstate_set_epp(cpudata, epp);  in amd_pstate_epp_update_limit()
1694 	/* avoid suspending when EPP is not enabled */  in amd_pstate_epp_suspend()
1754 	.name		= "amd-pstate-epp",