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powerpc/powernv: handle OPAL_SUCCESS return in opal_sensor_read

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Currently, when a sensor value is read, the kernel calls OPAL, which in
turn builds a message for the FSP, and waits for a message back.

The new device tree for OPAL sensors [1] adds new sensors that can be
read synchronously (core temperatures for instance) and that don't need
to wait for a response.

This patch modifies the opal call to accept an OPAL_SUCCESS return value
and cover the case above.

[1] https://lists.ozlabs.org/pipermail/skiboot/2015-March/000639.html

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Cédric Le Goater 2015-03-30 12:06:10 +02:00 committed by Michael Ellerman
parent e3c5c2e0bc
commit 6bc08d03e7
1 changed files with 20 additions and 12 deletions
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32
arch/powerpc/platforms/powernv/opal-sensor.c
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@ -46,21 +46,29 @@ int opal_get_sensor_data(u32 sensor_hndl, u32 *sensor_data)
mutex_lock(&opal_sensor_mutex);
ret = opal_sensor_read(sensor_hndl, token, &data);
if (ret != OPAL_ASYNC_COMPLETION) {
switch (ret) {
case OPAL_ASYNC_COMPLETION:
ret = opal_async_wait_response(token, &msg);
if (ret) {
pr_err("%s: Failed to wait for the async response, %d\n",
__func__, ret);
goto out_token;
}
ret = opal_error_code(be64_to_cpu(msg.params[1]));
*sensor_data = be32_to_cpu(data);
break;
case OPAL_SUCCESS:
ret = 0;
*sensor_data = be32_to_cpu(data);
break;
default:
ret = opal_error_code(ret);
goto out_token;
break;
}
ret = opal_async_wait_response(token, &msg);
if (ret) {
pr_err("%s: Failed to wait for the async response, %d\n",
__func__, ret);
goto out_token;
}
*sensor_data = be32_to_cpu(data);
ret = opal_error_code(be64_to_cpu(msg.params[1]));
out_token:
mutex_unlock(&opal_sensor_mutex);
opal_async_release_token(token);