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platform/x86: thinkpad_acpi: Fix invalid fan speed on ThinkPad X120e

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On ThinkPad X120e, fan speed is reported in ticks per revolution
rather than RPM.

Recalculate the fan speed value reported for ThinkPad X120e
to RPM based on a 22.5 kHz clock.

Based on the information on
https://www.thinkwiki.org/wiki/How_to_control_fan_speed,
the same problem is highly likely to be relevant to at least Edge11,
but Edge11 is not addressed in this patch.

Signed-off-by: Sybil Isabel Dorsett <sybdorsett@proton.me>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20250203163255.5525-1-sybdorsett@proton.me
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
This commit is contained in:
Sybil Isabel Dorsett 2025-02-03 16:33:15 +00:00 • committed by Ilpo Järvinen
parent a787ab73e2
commit 1046cac109
No known key found for this signature in database
GPG key ID: 59AC4F6153E5CE31
1 changed files with 14 additions and 2 deletions
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16
drivers/platform/x86/thinkpad_acpi.c
View file

@ -7885,6 +7885,7 @@ static struct ibm_struct volume_driver_data = {
#define FAN_NS_CTRL_STATUS BIT(2) /* Bit which determines control is enabled or not */
#define FAN_NS_CTRL BIT(4) /* Bit which determines control is by host or EC */
#define FAN_CLOCK_TPM (22500*60) /* Ticks per minute for a 22.5 kHz clock */
enum { /* Fan control constants */
fan_status_offset = 0x2f, /* EC register 0x2f */
@ -7940,6 +7941,7 @@ static int fan_watchdog_maxinterval;
static bool fan_with_ns_addr;
static bool ecfw_with_fan_dec_rpm;
static bool fan_speed_in_tpr;
static struct mutex fan_mutex;
@ -8142,8 +8144,11 @@ static int fan_get_speed(unsigned int *speed)
!acpi_ec_read(fan_rpm_offset + 1, &hi)))
return -EIO;
if (likely(speed))
if (likely(speed)) {
*speed = (hi << 8) | lo;
if (fan_speed_in_tpr && *speed != 0)
*speed = FAN_CLOCK_TPM / *speed;
}
break;
case TPACPI_FAN_RD_TPEC_NS:
if (!acpi_ec_read(fan_rpm_status_ns, &lo))
@ -8176,8 +8181,11 @@ static int fan2_get_speed(unsigned int *speed)
if (rc)
return -EIO;
if (likely(speed))
if (likely(speed)) {
*speed = (hi << 8) | lo;
if (fan_speed_in_tpr && *speed != 0)
*speed = FAN_CLOCK_TPM / *speed;
}
break;
case TPACPI_FAN_RD_TPEC_NS:
@ -8788,6 +8796,7 @@ static const struct attribute_group fan_driver_attr_group = {
#define TPACPI_FAN_NOFAN 0x0008 /* no fan available */
#define TPACPI_FAN_NS 0x0010 /* For EC with non-Standard register addresses */
#define TPACPI_FAN_DECRPM 0x0020 /* For ECFW's with RPM in register as decimal */
#define TPACPI_FAN_TPR 0x0040 /* Fan speed is in Ticks Per Revolution */
static const struct tpacpi_quirk fan_quirk_table[] __initconst = {
TPACPI_QEC_IBM('1', 'Y', TPACPI_FAN_Q1),
@ -8817,6 +8826,7 @@ static const struct tpacpi_quirk fan_quirk_table[] __initconst = {
TPACPI_Q_LNV3('R', '0', 'V', TPACPI_FAN_NS), /* 11e Gen5 KL-Y */
TPACPI_Q_LNV3('N', '1', 'O', TPACPI_FAN_NOFAN), /* X1 Tablet (2nd gen) */
TPACPI_Q_LNV3('R', '0', 'Q', TPACPI_FAN_DECRPM),/* L480 */
TPACPI_Q_LNV('8', 'F', TPACPI_FAN_TPR), /* ThinkPad x120e */
};
static int __init fan_init(struct ibm_init_struct *iibm)
@ -8887,6 +8897,8 @@ static int __init fan_init(struct ibm_init_struct *iibm)
if (quirks & TPACPI_FAN_Q1)
fan_quirk1_setup();
if (quirks & TPACPI_FAN_TPR)
fan_speed_in_tpr = true;
/* Try and probe the 2nd fan */
tp_features.second_fan = 1; /* needed for get_speed to work */
res = fan2_get_speed(&speed);