Fix for Thinkpad's with ECFW showing incorrect fan speed.
Some models use decimal instead of hexadecimal for the fan speed stored
in the EC registers.
for eg: the rpm register will have 0x4200 instead of 0x1068.
Here the actual RPM is "4200" in decimal.
A quirk added to handle this.
Signed-off-by: Vishnu Sankar <vishnuocv@xxxxxxxxx>
Signed-off-by: Vishnu Sankar <vsankar@xxxxxxxxxx>
Suggested-by: Mark Pearson <mpearson-lenovo@xxxxxxxxx>
---
drivers/platform/x86/thinkpad_acpi.c | 28 +++++++++++++++++++++++++---
1 file changed, 25 insertions(+), 3 deletions(-)
diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index 4c1b0553f872..6371a9f765c1 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -7936,6 +7936,7 @@ static u8 fan_control_resume_level;
static int fan_watchdog_maxinterval;
static bool fan_with_ns_addr;
+static bool ecfw_with_fan_dec_rpm;
static struct mutex fan_mutex;
@@ -8682,7 +8683,11 @@ static ssize_t fan_fan1_input_show(struct device *dev,
if (res < 0)
return res;
- return sysfs_emit(buf, "%u\n", speed);
+ /* Check for fan speeds displayed in hexadecimal */
+ if (!ecfw_with_fan_dec_rpm)
+ return sysfs_emit(buf, "%u\n", speed);
+ else
+ return sysfs_emit(buf, "%x\n", speed);
}
static DEVICE_ATTR(fan1_input, S_IRUGO, fan_fan1_input_show, NULL);
@@ -8699,7 +8704,11 @@ static ssize_t fan_fan2_input_show(struct device *dev,
if (res < 0)
return res;
- return sysfs_emit(buf, "%u\n", speed);
+ /* Check for fan speeds displayed in hexadecimal */
+ if (!ecfw_with_fan_dec_rpm)
+ return sysfs_emit(buf, "%u\n", speed);
+ else
+ return sysfs_emit(buf, "%x\n", speed);
}
static DEVICE_ATTR(fan2_input, S_IRUGO, fan_fan2_input_show, NULL);
@@ -8775,6 +8784,7 @@ static const struct attribute_group fan_driver_attr_group = {
#define TPACPI_FAN_2CTL 0x0004 /* selects fan2 control */
#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 */
static const struct tpacpi_quirk fan_quirk_table[] __initconst = {
TPACPI_QEC_IBM('1', 'Y', TPACPI_FAN_Q1),
@@ -8803,6 +8813,7 @@ static const struct tpacpi_quirk fan_quirk_table[] __initconst = {
TPACPI_Q_LNV3('R', '1', 'D', TPACPI_FAN_NS), /* 11e Gen5 GL-R */
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 */
};
static int __init fan_init(struct ibm_init_struct *iibm)
@@ -8847,6 +8858,13 @@ static int __init fan_init(struct ibm_init_struct *iibm)
tp_features.fan_ctrl_status_undef = 1;
}
+ /* Check for the EC/BIOS with RPM reported in decimal*/
+ if (quirks & TPACPI_FAN_DECRPM) {
+ pr_info("ECFW with fan RPM as decimal in EC register\n");
+ ecfw_with_fan_dec_rpm = 1;
+ tp_features.fan_ctrl_status_undef = 1;
+ }
+
if (gfan_handle) {
/* 570, 600e/x, 770e, 770x */
fan_status_access_mode = TPACPI_FAN_RD_ACPI_GFAN;
@@ -9067,7 +9085,11 @@ static int fan_read(struct seq_file *m)
if (rc < 0)
return rc;
- seq_printf(m, "speed:\t\t%d\n", speed);
+ /* Check for fan speeds displayed in hexadecimal */
+ if (!ecfw_with_fan_dec_rpm)
+ seq_printf(m, "speed:\t\t%d\n", speed);
+ else
+ seq_printf(m, "speed:\t\t%x\n", speed);
if (fan_status_access_mode == TPACPI_FAN_RD_TPEC_NS) {
/*
--
2.43.0
