/* ------------------------------------------------------------------------*//**
* @FUNCTION cpufreq_set
* @BRIEF change MPU OPP using cpufreq userspace governor.
* @RETURNS 0 in case of success
* CPUFREQ_ERR_NOT_AVAILABLE
* CPUFREQ_ERR_UNEXPECTED
* @param[in] freq_mpu: MPU frequency to be set (KHz)
* @DESCRIPTION change MPU OPP using cpufreq userspace governor.
*//*------------------------------------------------------------------------ */
int cpufreq_set(unsigned int freq_mpu)
{
int ret;
char prev_gov[CPUFREQ_GOV_MAX_NAME_LENGTH];
char freq_mpu_s[8];
FILE *fp;
/* Switch to userspace governor to get MPU OPP control */
ret = cpufreq_scaling_governor_set("userspace", prev_gov);
if (ret != 0)
return ret;
fp = fopen(cpufreq_scaling_setspeed_file, "r+");
if (fp == NULL) {
fprintf(stderr, "%s not found, no CPUFREQ?\n\n",
cpufreq_scaling_setspeed_file);
return CPUFREQ_ERR_NOT_AVAILABLE;
}
sprintf(freq_mpu_s, "%u", freq_mpu);
if (fwrite(freq_mpu_s, sizeof(char), strlen(freq_mpu_s), fp)
!= strlen(freq_mpu_s)) {
fprintf(stderr, "%s(): could not update CPU frequency!\n",
__func__);
ret = CPUFREQ_ERR_UNEXPECTED;
} else {
ret = 0;
}
if (fp != NULL)
fclose(fp);
return ret;
}
/* ------------------------------------------------------------------------*//**
* @FUNCTION lib54xx_voltage_set
* @BRIEF change voltage of a given voltage domain, switching
* CPUFreq governor to "userspace" & disabling smart-reflex
* @RETURNS 0 on success
* OMAPCONF_ERR_CPU
* OMAPCONF_ERR_ARG
* OMAPCONF_ERR_NOT_AVAILABLE
* OMAPCONF_ERR_REG_ACCESS
* OMAPCONF_ERR_INTERNAL
* @param[in] vdd_id: voltage domain ID
* @param[in] volt: new supply voltage (in volt)
* @DESCRIPTION change voltage of a given voltage domain, switching
* CPUFreq governor to "userspace" & disabling smart-reflex
*//*------------------------------------------------------------------------ */
int lib54xx_voltage_set(voltdm54xx_id vdd_id, double volt)
{
int ret, ret_cpufreq;
char prev_gov[CPUFREQ_GOV_MAX_NAME_LENGTH];
sr54xx_mod_id sr_id;
CHECK_CPU(54xx, OMAPCONF_ERR_CPU);
CHECK_ARG_LESS_THAN(vdd_id, VDD54XX_ID_MAX, OMAPCONF_ERR_ARG);
/*
* Switch governor to 'userspace' otherwise voltage change will be
* overriden in case of OPP change.
*/
printf("Warning: switching CPUFreq governor to 'userspace', otherwise "
"voltage change will be overriden...\n");
ret_cpufreq = cpufreq_scaling_governor_set("userspace", prev_gov);
if (ret_cpufreq < 0)
printf("Warning: failed to switch governor. Voltage will be "
"overriden in case of OPP change.\n");
else
printf("CPUFreq governor switched to 'userspace'.\n");
/*
* Disable Smart-Reflex (if running) otherwise voltage change will be
* overriden.
*/
sr_id = sr54xx_vddid2srid(vdd_id);
if (sr54xx_avs_is_enabled(sr_id)) {
printf("Warning: %s Smart-Reflex AVS is enabled. "
"Disabling it...\n", voltdm54xx_name_get(vdd_id));
ret = sr54xx_avs_enable(sr_id, 0);
if (ret == 0)
printf("Smartreflex disabled.\n\n");
else
printf("Warning: Could not disable Smart-Reflex AVS. "
"Voltage may be overriden.\n\n");
} else {
printf("Smartreflex disabled.\n\n");
}
ret = voltdm54xx_voltage_set(vdd_id,
(unsigned long) (volt * 1000000));
if (ret != 0) {
fprintf(stderr, "Oups, could not change %s voltage to "
"%.3lfV ... (%d)\n\n",
voltdm54xx_name_get(vdd_id), volt, ret);
} else {
printf("%s supply voltage set to %1.3lfV (vsel = 0x%02X).\n\n",
voltdm54xx_name_get(vdd_id), volt,
smps_uvolt2vsel(vdd_id2smps_id(vdd_id),
(unsigned long) (volt * 1000000)));
printf("Warning:\n"
" - Do not re-enable %s smartreflex or new voltage "
"will be overriden.\n"
" - Do not change OPP (or use CPUFREQ) or new voltage"
" will be overriden.\n\n", voltdm54xx_name_get(vdd_id));
}
return ret;
}
/* ------------------------------------------------------------------------*//**
* @FUNCTION opp_show
* @BRIEF show current operating voltages and key clock rates.
* @RETURNS 0 in case of success
* OMAPCONF_ERR_REG_ACCESS
* OMAPCONF_ERR_CPU
* OMAPCONF_ERR_INTERNAL
* @param[in,out] stream: output file stream (opened, != NULL)
* @DESCRIPTION show current operating voltages and key clock rates.
*//*------------------------------------------------------------------------ */
int opp_show(FILE *stream)
{
int volt, volt2;
const char *opp_s, *opp_s2;
int temp;
int rate_mpu, rate_mpu_por;
int rate_dsp, rate_iva, rate_gpu;
int rate_dsp_por, rate_iva_por, rate_gpu_por, rate_aess_por;
int rate_l3, rate_l3_por;
int rate_l4, rate_emif, rate_lpddr2, rate_aess, rate_iss,
rate_fdif, rate_dss, rate_bb2d, rate_hsi;
mod_module_mode mmode;
int rate_cal, rate_ipu, rate_c2c;
char table[TABLE_MAX_ROW][TABLE_MAX_COL][TABLE_MAX_ELT_LEN];
unsigned int row = 0;
unsigned int retry_cnt = 0;
unsigned int found = 0;
const genlist *voltdm_list;
int i, vdd_count;
const char voltdm[VOLTDM_MAX_NAME_LENGTH];
char prev_gov[CPUFREQ_GOV_MAX_NAME_LENGTH],
prev_gov2[CPUFREQ_GOV_MAX_NAME_LENGTH];
const char *temp_sensor;
/* Switch to userspace governor temporarily,
* so that OPP cannot change during audit and does not false it.
*/
cpufreq_scaling_governor_set("userspace", prev_gov);
autoadjust_table_init(table);
row = 0;
strncpy(table[row][1], "Temperature", TABLE_MAX_ELT_LEN);
strncpy(table[row][2], "Voltage", TABLE_MAX_ELT_LEN);
strncpy(table[row][3], "Frequency", TABLE_MAX_ELT_LEN);
strncpy(table[row][4], "OPerating Point", TABLE_MAX_ELT_LEN);
row++;
/*
* In order to make sure all details (OPP, voltage, clock rates) are
* coherent (due to potential OPP change in between), must use a loop,
* checking that OPP and voltage did not change and that at least ONE
* clock rate is aligned to expected rate for the detected OPP.
*/
dprintf("%s():\n", __func__);
voltdm_list = voltdm_list_get();
if (voltdm_list == NULL)
return OMAPCONF_ERR_INTERNAL;
vdd_count = voltdm_count_get();
if (vdd_count < 0)
return OMAPCONF_ERR_INTERNAL;
dprintf("found %d voltage domains\n", vdd_count);
for (i = 1; i < vdd_count; i++) {
genlist_get((genlist *) voltdm_list, i, (char *) &voltdm);
snprintf(table[row][0], TABLE_MAX_ELT_LEN, "%s / VDD_CORE%u",
voltdm, i);
dprintf(" %s:\n", voltdm);
/* Retrieve OPP and clock rates */
retry_cnt = 0;
found = 0;
do {
dprintf(" TRY #%u:\n", retry_cnt);
if (retry_cnt == 0)
/* Print warning on first try */
opp_s = opp_get(voltdm, 0);
else
opp_s = opp_get(voltdm, 1);
if (opp_s == NULL) {
dprintf(" OPP NOT detected!\n");
opp_s = OPP_UNKNOWN;
} else {
dprintf(" OPP detected: %s\n", opp_s);
}
volt = voltdm_voltage_get(voltdm);
dprintf(" Voltage: %duV\n", volt);
if (strcmp(voltdm, "VDD_MPU") == 0) {
rate_mpu = mod_clk_rate_get("MPU");
if (strcmp(opp_s, OPP_UNKNOWN) != 0)
rate_mpu_por = mod_por_clk_rate_get(
"MPU", opp_s);
else
rate_mpu_por = -1;
dprintf(
" MPU Rate: %dKHz, POR Rate: %dKHz\n",
rate_mpu, rate_mpu_por);
} else if ((strcmp(voltdm, "VDD_IVA") == 0) ||
(strcmp(voltdm, "VDD_MM") == 0)) {
rate_dsp_por = -1;
rate_iva_por = -1;
rate_aess_por = -1;
rate_gpu_por = -1;
rate_dsp = mod_clk_rate_get("DSP");
rate_iva = mod_clk_rate_get("IVA");
if (cpu_is_omap44xx())
rate_aess = mod_clk_rate_get("AESS");
else if (cpu_is_omap54xx())
rate_gpu = mod_clk_rate_get("GPU");
if (strcmp(opp_s, OPP_UNKNOWN) != 0) {
rate_dsp_por = mod_por_clk_rate_get(
"DSP", opp_s);
rate_iva_por = mod_por_clk_rate_get(
"IVA", opp_s);
if (cpu_is_omap44xx())
rate_aess_por =
mod_por_clk_rate_get(
"AESS", opp_s);
else if (cpu_is_omap54xx())
rate_gpu_por =
mod_por_clk_rate_get(
"GPU", opp_s);
}
dprintf(
" DSP Rate: %dMHz, POR Rate: %dMHz\n",
rate_dsp, rate_dsp_por);
dprintf(
" IVA Rate: %dMHz, POR Rate: %dMHz\n",
rate_iva, rate_iva_por);
if (cpu_is_omap44xx()) {
dprintf(
" AESS Rate: %dMHz, POR Rate: %dMHz\n",
rate_aess, rate_aess_por);
} else if (cpu_is_omap54xx()) {
dprintf(
" GPU Rate: %dMHz, POR Rate: %dMHz\n",
rate_gpu, rate_gpu_por);
}
} else if (strcmp(voltdm, "VDD_CORE") == 0) {
rate_l3 = mod_clk_rate_get("L3");
if (strcmp(opp_s, OPP_UNKNOWN) != 0)
rate_l3_por = mod_por_clk_rate_get(
"L3", opp_s);
else
rate_l3_por = -1;
dprintf(
" L3_1 Rate: %dMHz, POR Rate: %dMHz\n",
rate_l3, rate_l3_por);
rate_emif = mod_clk_rate_get("EMIF");
rate_lpddr2 = mod_clk_rate_get("MEM");
rate_l4 = mod_clk_rate_get("L4");
if (cpu_is_omap44xx())
rate_gpu = mod_clk_rate_get("GPU");
else if (cpu_is_omap54xx())
rate_aess = mod_clk_rate_get("AESS");
rate_iss = mod_clk_rate_get("ISS");
rate_fdif = mod_clk_rate_get("FDIF");
if (!cpu_is_omap44xx())
rate_cal = mod_clk_rate_get("CAL");
else
rate_cal = -1;
rate_ipu = mod_clk_rate_get("IPU");
rate_dss = mod_clk_rate_get("DSS");
rate_hsi = mod_clk_rate_get("HSI");
if (cpu_is_omap4470() || cpu_is_omap54xx())
rate_bb2d = mod_clk_rate_get("BB2D");
else
rate_bb2d = -1;
rate_c2c = mod_clk_rate_get("C2C");
}
if (strcmp(opp_s, OPP_UNKNOWN) == 0) {
dprintf(
" Could not detect OPP, aborting for this domain.\n");
break;
}
opp_s2 = opp_get(voltdm, 1);
if (opp_s2 == NULL) {
dprintf(" OPP NOT detected! (2)\n");
opp_s2 = OPP_UNKNOWN;
} else {
dprintf(" OPP detected: %s (2)\n", opp_s2);
}
volt2 = voltdm_voltage_get(voltdm);
dprintf(" Voltage (2): %dV\n", volt2);
if (strcmp(voltdm, "VDD_MPU") == 0) {
found = ((rate_mpu == rate_mpu_por) &&
(strcmp(opp_s, opp_s2) == 0) &&
(volt == volt2));
} else if (strcmp(voltdm, "VDD_IVA") == 0) {
found = ((strcmp(opp_s, opp_s2) == 0) &&
(volt == volt2) &&
(((unsigned int) rate_dsp == (unsigned int) rate_dsp_por) ||
((unsigned int) rate_iva == (unsigned int) rate_iva_por) ||
((unsigned int) rate_aess == (unsigned int) rate_aess_por)));
} else if (strcmp(voltdm, "VDD_MM") == 0) {
found = ((strcmp(opp_s, opp_s2) == 0) &&
(volt == volt2) &&
((rate_dsp == rate_dsp_por) ||
(rate_iva == rate_iva_por) ||
(rate_gpu == rate_gpu_por)));
} else if (strcmp(voltdm, "VDD_CORE") == 0) {
found = ((strcmp(opp_s, opp_s2) == 0) &&
(volt == volt2) &&
(rate_l3 == rate_l3_por));
}
dprintf(" found=%u\n", found);
retry_cnt++;
} while ((retry_cnt < OPP_MAX_RETRY) && (found == 0));
/* Print temperature */
temp_sensor = temp_sensor_voltdm2sensor(voltdm);
if (temp_sensor == NULL) {
snprintf(table[row][1], TABLE_MAX_ELT_LEN, "NA");
} else {
temp = temp_sensor_get(temp_sensor);
if (temp != TEMP_ABSOLUTE_ZERO)
snprintf(table[row][1], TABLE_MAX_ELT_LEN,
"%dC / %dF", temp,
celcius2fahrenheit(temp));
else
snprintf(table[row][1], TABLE_MAX_ELT_LEN,
"NA");
}
/* Print voltage */
if (volt < 0)
snprintf(table[row][2], TABLE_MAX_ELT_LEN, "NA");
else if (!cpu_is_omap44xx())
snprintf(table[row][2], TABLE_MAX_ELT_LEN, "%.3lf V",
uv2v(volt));
else
snprintf(table[row][2], TABLE_MAX_ELT_LEN, "%.6lf V",
uv2v(volt));
/* Print OPP */
if (retry_cnt < OPP_MAX_RETRY) {
strncpy(table[row][4], opp_s,
TABLE_MAX_ELT_LEN);
} else {
fprintf(stderr,
"omapconf: too many %s OPP changes, could not retrieve it!!!\n",
voltdm);
strncpy(table[row][4], "ERROR", TABLE_MAX_ELT_LEN);
}
row++;
/* Print clock rates */
if (strcmp(voltdm, "VDD_MPU") == 0) {
if (cpu_is_online(1) == 1)
strncpy(table[row][0], " MPU (CPU1 ON)",
TABLE_MAX_ELT_LEN);
else
strncpy(table[row][0], " MPU (CPU1 OFF)",
TABLE_MAX_ELT_LEN);
snprintf(table[row][3], TABLE_MAX_ELT_LEN, " %-4d MHz",
rate_mpu / 1000);
row += 2;
} else if ((strcmp(voltdm, "VDD_IVA") == 0) ||
(strcmp(voltdm, "VDD_MM") == 0)) {
strncpy(table[row][0], " IVA", TABLE_MAX_ELT_LEN);
mmode = mod_mode_get("IVA");
if (mmode == MOD_DISABLED_MODE)
snprintf(table[row][3], TABLE_MAX_ELT_LEN,
"(%-4d MHz) (1)", rate_iva / 1000);
else
snprintf(table[row][3], TABLE_MAX_ELT_LEN,
" %-4d MHz", rate_iva / 1000);
row++;
if (cpu_is_omap44xx()) {
strncpy(table[row][0], " AESS",
TABLE_MAX_ELT_LEN);
mmode = mod_mode_get("AESS");
if (mmode == MOD_DISABLED_MODE)
snprintf(table[row][3],
TABLE_MAX_ELT_LEN,
"(%-4d MHz) (1)",
rate_aess / 1000);
else
snprintf(table[row][3],
TABLE_MAX_ELT_LEN,
" %-4d MHz", rate_aess / 1000);
row++;
} else if (cpu_is_omap54xx()) {
strncpy(table[row][0], " GPU",
TABLE_MAX_ELT_LEN);
mmode = mod_mode_get("GPU");
if (mmode == MOD_DISABLED_MODE)
snprintf(table[row][3],
TABLE_MAX_ELT_LEN,
"(%-4d MHz) (1)",
rate_gpu / 1000);
else
snprintf(table[row][3],
TABLE_MAX_ELT_LEN,
" %-4d MHz", rate_gpu / 1000);
row++;
}
strncpy(table[row][0], " DSP", TABLE_MAX_ELT_LEN);
mmode = mod_mode_get("DSP");
if (mmode == MOD_DISABLED_MODE)
snprintf(table[row][3], TABLE_MAX_ELT_LEN,
"(%-4d MHz) (1)", rate_dsp / 1000);
else
snprintf(table[row][3], TABLE_MAX_ELT_LEN,
" %-4d MHz", rate_dsp / 1000);
row += 2;
} else if (strcmp(voltdm, "VDD_CORE") == 0) {
strncpy(table[row][0], " L3", TABLE_MAX_ELT_LEN);
snprintf(table[row][3], TABLE_MAX_ELT_LEN, " %-4d MHz",
rate_l3 / 1000);
row++;
strncpy(table[row][0], " DMM/EMIF", TABLE_MAX_ELT_LEN);
snprintf(table[row][3], TABLE_MAX_ELT_LEN, " %-4d MHz",
rate_emif / 1000);
row++;
strncpy(table[row][0], " LP-DDR2",
TABLE_MAX_ELT_LEN);
snprintf(table[row][3], TABLE_MAX_ELT_LEN, " %-4d MHz",
rate_lpddr2 / 1000);
row++;
strncpy(table[row][0], " L4", TABLE_MAX_ELT_LEN);
snprintf(table[row][3], TABLE_MAX_ELT_LEN, " %-4d MHz",
rate_l4 / 1000);
row++;
if (cpu_is_omap44xx()) {
strncpy(table[row][0], " GPU",
TABLE_MAX_ELT_LEN);
mmode = mod_mode_get("GPU");
if (mmode == MOD_DISABLED_MODE)
snprintf(table[row][3],
TABLE_MAX_ELT_LEN,
"(%-4d MHz) (1)",
rate_gpu / 1000);
else
snprintf(table[row][3],
TABLE_MAX_ELT_LEN,
" %-4d MHz", rate_gpu / 1000);
row++;
} else if (cpu_is_omap54xx()) {
strncpy(table[row][0], " AESS",
TABLE_MAX_ELT_LEN);
mmode = mod_mode_get("AESS");
if (mmode == MOD_DISABLED_MODE)
snprintf(table[row][3],
TABLE_MAX_ELT_LEN,
"(%-4d MHz) (1)",
rate_aess / 1000);
else
snprintf(table[row][3],
TABLE_MAX_ELT_LEN,
" %-4d MHz", rate_aess / 1000);
row++;
}
strncpy(table[row][0], " FDIF", TABLE_MAX_ELT_LEN);
mmode = mod_mode_get("FDIF");
if (mmode == MOD_DISABLED_MODE)
snprintf(table[row][3], TABLE_MAX_ELT_LEN,
"(%-4d MHz) (1)", rate_fdif / 1000);
else
snprintf(table[row][3], TABLE_MAX_ELT_LEN,
" %-4d MHz", rate_fdif / 1000);
row++;
if (cpu_is_omap54xx()) {
strncpy(table[row][0], " CAL",
TABLE_MAX_ELT_LEN);
mmode = mod_mode_get("CAL");
if (mmode == MOD_DISABLED_MODE)
snprintf(table[row][3],
TABLE_MAX_ELT_LEN,
"(%-4d MHz) (1)",
rate_cal / 1000);
else
snprintf(table[row][3],
TABLE_MAX_ELT_LEN,
" %-4d MHz",
rate_cal / 1000);
row++;
}
strncpy(table[row][0], " IPU", TABLE_MAX_ELT_LEN);
mmode = mod_mode_get("IPU");
if (mmode == MOD_DISABLED_MODE)
snprintf(table[row][3], TABLE_MAX_ELT_LEN,
"(%-4d MHz) (1)", rate_ipu / 1000);
else
snprintf(table[row][3], TABLE_MAX_ELT_LEN,
" %-4d MHz", rate_ipu / 1000);
row++;
if (cpu_is_omap44xx()) {
strncpy(table[row][0], " Cortex-M3 Cores",
TABLE_MAX_ELT_LEN);
if (mmode == MOD_DISABLED_MODE)
snprintf(table[row][3],
TABLE_MAX_ELT_LEN,
"(%-4d MHz) (1)",
rate_ipu / 2000);
else
snprintf(table[row][3],
TABLE_MAX_ELT_LEN,
" %-4d MHz", rate_ipu / 2000);
row++;
} else if (cpu_is_omap54xx()) {
strncpy(table[row][0], " Cortex-M4 Cores",
TABLE_MAX_ELT_LEN);
if (mmode == MOD_DISABLED_MODE)
snprintf(table[row][3],
TABLE_MAX_ELT_LEN,
"(%-4d MHz) (1)",
rate_ipu / 2000);
else
snprintf(table[row][3],
TABLE_MAX_ELT_LEN,
" %-4d MHz", rate_ipu / 2000);
row++;
}
strncpy(table[row][0], " ISS", TABLE_MAX_ELT_LEN);
mmode = mod_mode_get("ISS");
if (mmode == MOD_DISABLED_MODE)
snprintf(table[row][3], TABLE_MAX_ELT_LEN,
"(%-4d MHz) (1)", rate_iss / 1000);
else
snprintf(table[row][3], TABLE_MAX_ELT_LEN,
" %-4d MHz", rate_iss / 1000);
row++;
strncpy(table[row][0], " DSS", TABLE_MAX_ELT_LEN);
mmode = mod_mode_get("DSS");
if (mmode == MOD_DISABLED_MODE)
snprintf(table[row][3], TABLE_MAX_ELT_LEN,
"(%-4d MHz) (1)", rate_dss / 1000);
else
snprintf(table[row][3], TABLE_MAX_ELT_LEN,
" %-4d MHz", rate_dss / 1000);
row++;
if (cpu_is_omap4470() || cpu_is_omap54xx()) {
strncpy(table[row][0], " BB2D",
TABLE_MAX_ELT_LEN);
mmode = mod_mode_get("BB2D");
if (mmode == MOD_DISABLED_MODE)
snprintf(table[row][3],
TABLE_MAX_ELT_LEN,
"(%-4d MHz) (1)",
rate_bb2d / 1000);
else
snprintf(table[row][3],
TABLE_MAX_ELT_LEN, " %-4d MHz",
rate_bb2d / 1000);
row++;
}
strncpy(table[row][0], " HSI", TABLE_MAX_ELT_LEN);
mmode = mod_mode_get("HSI");
if (mmode == MOD_DISABLED_MODE)
snprintf(table[row][3], TABLE_MAX_ELT_LEN,
"(%-4d MHz) (1)", rate_hsi / 1000);
else
snprintf(table[row][3], TABLE_MAX_ELT_LEN,
" %-4d MHz", rate_hsi / 1000);
row++;
strncpy(table[row][0], " C2C", TABLE_MAX_ELT_LEN);
mmode = mod_mode_get("C2C");
if (mmode == MOD_DISABLED_MODE)
snprintf(table[row][3], TABLE_MAX_ELT_LEN,
"(%-4d MHz) (1)", rate_c2c / 1000);
else
snprintf(table[row][3], TABLE_MAX_ELT_LEN,
" %-4d MHz", rate_c2c / 1000);
row++;
}
}
/* Display table */
autoadjust_table_fprint(stream, table, row, 5);
fprintf(stream, "Notes:\n");
fprintf(stream,
" (1) Module is disabled, rate may not be relevant.\n\n");
/* Restore CPUFreq governor */
cpufreq_scaling_governor_set(prev_gov, prev_gov2);
return 0;
}
/* ------------------------------------------------------------------------*//**
* @FUNCTION lib54xx_vminsearch
* @BRIEF search minimum supply voltage by decreasing voltage
* step by step until it breaks.
* @RETURNS 0 on success
* OMAPCONF_ERR_CPU
* OMAPCONF_ERR_ARG
* OMAPCONF_ERR_NOT_AVAILABLE
* OMAPCONF_ERR_REG_ACCESS
* OMAPCONF_ERR_INTERNAL
* @param[in] argc: shell input argument number (must be == 3)
* @param[in] argv: shell input argument(s)
* argv[0]="voltage domain" ("mpu", "mm", "core")
* argv[1]="initial voltage" (in volts)
* argv[2]="delay" between steps (in milliseconds)
* @DESCRIPTION search minimum supply voltage by decreasing voltage
* step by step until it breaks.
* NB: switch CPUFreq governor to "userspace" &
* disable smart-reflex
*//*------------------------------------------------------------------------ */
int lib54xx_vminsearch(int argc, char *argv[])
{
long uv;
double v, prev_v;
int ret, temp;
unsigned long vstep;
unsigned char vsel;
voltdm54xx_id vdd_id;
sr54xx_mod_id sr_id;
unsigned int ms;
char prev_gov[CPUFREQ_GOV_MAX_NAME_LENGTH];
CHECK_CPU(54xx, OMAPCONF_ERR_CPU);
/* Retrieve arguments */
if (argc != 3)
goto lib54xx_vminsearch_arg_err;
if (strcmp(argv[0], "mpu") == 0)
vdd_id = VDD54XX_MPU;
else if (strcmp(argv[0], "mm") == 0)
vdd_id = VDD54XX_MM;
else if (strcmp(argv[0], "core") == 0)
vdd_id = VDD54XX_CORE;
else
goto lib54xx_vminsearch_arg_err;
ret = sscanf(argv[1], "%lf", &v);
if (ret != 1)
goto lib54xx_vminsearch_arg_err;
ret = sscanf(argv[2], "%d", &ms);
if (ret != 1)
goto lib54xx_vminsearch_arg_err;
if (ms <= 0)
goto lib54xx_vminsearch_arg_err;
/*
* Switch governor to 'userspace' otherwise voltage change will be
* overriden in case of OPP change.
*/
printf("Warning: switching CPUFreq governor to 'userspace', otherwise "
"voltage change will be overriden...\n");
ret = cpufreq_scaling_governor_set("userspace", prev_gov);
if (ret < 0)
printf("Warning: failed to switch governor. Voltage will be "
"overriden in case of OPP change.\n");
else
printf("CPUFreq governor switched to 'userspace'.\n");
/*
* Disable Smart-Reflex (if running) otherwise voltage change will be
* overriden.
*/
sr_id = sr54xx_vddid2srid(vdd_id);
if (sr54xx_avs_is_enabled(sr_id)) {
printf("Warning: %s Smart-Reflex AVS is enabled. "
"Disabling it...\n", voltdm54xx_name_get(vdd_id));
ret = sr54xx_avs_enable(sr_id, 0);
if (ret == 0)
printf("Smartreflex disabled.\n\n");
else
printf("Warning: Could not disable Smart-Reflex AVS. "
"Voltage may be overriden.\n\n");
} else {
printf("Smartreflex disabled.\n\n");
}
/* Show current OPP for reference */
printf("Current OPP configuration for reference:\n\n");
opp_show(stdout);
/* Retrieving SMPS voltage step */
vstep = smps_step_get(vdd_id2smps_id(vdd_id));
dprintf("%s(): vstep=%luuV\n", __func__, vstep);
printf("Vmin SEARCH on %s domain scaling voltage down from %1.3lfV in "
"steps of %lumV, waiting %dms between each step.\n",
voltdm54xx_name_get(vdd_id), v, vstep / 1000, ms);
printf("LAST voltage displayed with OK status before crash "
"will be the Vmin for %s domain.\n\n",
voltdm54xx_name_get(vdd_id));
printf("NB:\n - Make sure your load generator application is "
"running in background during the whole procedure.\n");
printf(" - PLATFORM MUST BE REBOOTED AFTER USE "
"(NO POSSIBLE RECOVERY).\n\n");
/* Rounding requested initial voltage */
vsel = smps_uvolt2vsel(vdd_id2smps_id(vdd_id),
(unsigned long) (v * 1000000));
prev_v = v;
v = (double) smps_vsel2uvolt(vdd_id2smps_id(vdd_id), vsel);
v = v / 1000000;
if (v != prev_v)
printf("Note: rounded up initial voltage to %.3lfV.\n\n", v);
/* Decreasing voltage step by step until it breaks */
printf("Starting Vmin SEARCH...\n");
for (uv = (unsigned long) (v * 1000000); uv >= 0; uv = uv - vstep) {
/* Get vsel corresponding to target voltage */
vsel = smps_uvolt2vsel(vdd_id2smps_id(vdd_id), uv);
temp = temp54xx_get(voltdm2sensor_id(vdd_id));
if (temp != TEMP_ABSOLUTE_ZERO)
printf("Trying %1.3lfV (SMPS code: 0x%02X, temperature: %dC/%dF)...",
smps_vsel2volt(vdd_id2smps_id(vdd_id), vsel),
vsel, temp, celcius2fahrenheit(temp));
else
printf("Trying %1.3lfV (SMPS code: 0x%02X, temperature: N/A)...",
smps_vsel2volt(vdd_id2smps_id(vdd_id), vsel),
vsel);
fflush(stdout);
ret = smps_voltage_set(vdd_id2smps_id(vdd_id), uv);
if (ret != 0) {
fprintf(stderr, "Error: could not set %s voltage!\n\n",
voltdm54xx_name_get(vdd_id));
return ret;
}
usleep(1000 * ms);
printf("OK!\n");
}
fprintf(stderr, "Shouldn't have reached this point... "
"please check voltage is really scaling down.\n\n");
return 0;
lib54xx_vminsearch_arg_err:
return err_arg_msg_show(HELP_VOLT);
return OMAPCONF_ERR_ARG;
}
