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| author | Martin Blumenstingl <martin.blumenstingl@googlemail.com> | 2016-12-11 22:14:32 +0100 |
|---|---|---|
| committer | Sudeep Holla <sudeep.holla@arm.com> | 2016-12-30 14:53:36 +0000 |
| commit | a766347b15c01507db9bf01f9b7021be5a776691 (patch) | |
| tree | 25e72d837ba668ff633d855af5e2e944ac548c7a /drivers | |
| parent | 7ce7d89f48834cefece7804d38fc5d85382edf77 (diff) | |
| download | linux-a766347b15c01507db9bf01f9b7021be5a776691.tar.gz linux-a766347b15c01507db9bf01f9b7021be5a776691.tar.bz2 linux-a766347b15c01507db9bf01f9b7021be5a776691.zip | |
firmware: arm_scpi: fix reading sensor values on pre-1.0 SCPI firmwares
The pre-1.0 SCPI firmwares are using single __le32 as sensor value,
while the SCPI v1.0 protocol uses two __le32 as sensor values(64bit)
split into 32bit upper and 32bit lower value.
Using an "struct sensor_value" to read the sensor value on a pre-1.0
SCPI firmware gives garbage in the "hi_val" field.
This patch fixes the issue by reading only the lower 32-bit value for
all pre-1.0 SCPI versions.
Suggested-by: Sudeep Holla <Sudeep.Holla@arm.com>
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
[sudeep.holla@arm.com: updated the commit log to reflect the implementation]
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/firmware/arm_scpi.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/firmware/arm_scpi.c b/drivers/firmware/arm_scpi.c index 70e13230d8db..9ad0b1934be9 100644 --- a/drivers/firmware/arm_scpi.c +++ b/drivers/firmware/arm_scpi.c @@ -721,11 +721,17 @@ static int scpi_sensor_get_value(u16 sensor, u64 *val) ret = scpi_send_message(CMD_SENSOR_VALUE, &id, sizeof(id), &buf, sizeof(buf)); - if (!ret) + if (ret) + return ret; + + if (scpi_info->is_legacy) + /* only 32-bits supported, hi_val can be junk */ + *val = le32_to_cpu(buf.lo_val); + else *val = (u64)le32_to_cpu(buf.hi_val) << 32 | le32_to_cpu(buf.lo_val); - return ret; + return 0; } static int scpi_device_get_power_state(u16 dev_id) |