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ec/kontron/it8516e: Add PWM limits option 

Add an option to set minimal and maximal PWM percentages when the fan is
in temperature controlled mode. Also fix a non-ascii flaw.

Change-Id: I85ae244bee2145bf17d6c29e93dd4871540985c8
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: http://review.coreboot.org/3774
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
This commit is contained in:
Nico Huber 2013-07-12 14:43:11 +02:00 committed by Stefan Reinauer
parent 942b6c2117
commit 9ce71b3cca
2 changed files with 44 additions and 8 deletions
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7
src/ec/kontron/it8516e/chip.h
View File

@ -30,12 +30,15 @@ struct ec_kontron_it8516e_config {
* Can be overwritten by
* systemp_type,
* fan1_mode, fan2_mode,
* fan1_target, and fan2_target
* fan1_target, fan2_target,
* fan1_min, fan2_min, fan1_max, and fan2_max
* nvram options.
*/
enum it8516e_systemp_types default_systemp;
enum it8516e_fan_modes default_fan_mode[2];
u16 default_fan_target[2]; /* PWM: % / Speed: RPM / Thermal: °C */
u16 default_fan_target[2]; /* PWM: % / Speed: RPM / Thermal: degree C */
u8 default_fan_min[2]; /* min PWM in % */
u8 default_fan_max[2]; /* max PWM in % */
};
#endif /* EC_KONTRON_IT8516E_CHIP_H */

41
src/ec/kontron/it8516e/ec.c
View File

@ -40,6 +40,7 @@ enum { /* EC commands */
IT8516E_CMD_SET_FAN_SPEED = 0x15,
IT8516E_CMD_GET_FAN_TEMP = 0x16,
IT8516E_CMD_SET_FAN_TEMP = 0x17,
IT8516E_CMD_SET_FAN_LIMITS = 0x1a,
};
static void it8516e_set_systemp_type(const u8 type)
@ -89,14 +90,29 @@ static void it8516e_set_fan_temperature(const u8 idx, const u8 temp)
send_ec_data(((temp << 6) >> 8) & 0xff);
}
static void it8516e_set_fan_limits(const u8 idx, const u8 min, const u8 max)
{
if (send_ec_command(IT8516E_CMD_SET_FAN_LIMITS))
return;
if (send_ec_data(idx))
return;
if (send_ec_data(min))
return;
send_ec_data(max);
}
static void it8516e_set_fan_from_options(const config_t *const config,
const u8 fan_idx)
{
static char fanX_mode[] = "fanX_mode";
static char fanX_target[] = "fanX_target";
static char fanX_min[] = "fanX_min";
static char fanX_max[] = "fanX_max";
u8 fan_mode = config->default_fan_mode[fan_idx];
u16 fan_target = config->default_fan_target[fan_idx];
u8 fan_min = config->default_fan_min[fan_idx];
u8 fan_max = config->default_fan_max[fan_idx];
fanX_mode[3] = '1' + fan_idx;
get_option(&fan_mode, fanX_mode);
@ -129,11 +145,28 @@ static void it8516e_set_fan_from_options(const config_t *const config,
break;
case IT8516E_MODE_THERMAL:
printk(BIOS_DEBUG,
"Setting it8516e fan%d "
"control to %d°C.\n",
"Setting it8516e fan%d control to %d C.\n",
fan_idx + 1, fan_target);
it8516e_set_fan_temperature(
fan_idx, fan_target);
it8516e_set_fan_temperature(fan_idx, fan_target);
fanX_min[3] = '1' + fan_idx;
fanX_max[3] = '1' + fan_idx;
get_option(&fan_min, fanX_min);
get_option(&fan_max, fanX_max);
if (!fan_max || fan_max > 100) /* Constrain fan_max to 100% */
fan_max = 100;
if (fan_min >= 100) /* Constrain fan_min to 99% */
fan_min = 99;
if (fan_max <= fan_min) /* If fan_min is the higher of the two,
it's safer for the hardware to keep
its value. Therefore, update fan_max. */
fan_max = fan_min + 1;
printk(BIOS_DEBUG,
"Setting it8516e fan%d limits to %d%% - %d%% PWM.\n",
fan_idx + 1, fan_min, fan_max);
it8516e_set_fan_limits(fan_idx, fan_min, fan_max);
break;
}
}