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Subject[PATCH] tpm/tpm_crb: enter the low power state upon device suspend
Date
This fix enables a platform to enter the idle state (suspend-to-idle)

The driver needs to request explicitly go_idle upon completion
from the pm suspend handler.
The runtime pm is disabled on suspend during prepare state by calling
pm_runtime_get_noresume, hence we cannot relay on runtime pm to leave
the device in low power state. Symmetrically cmdReady is called
upon resume.

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
---
drivers/char/tpm/tpm_crb.c | 25 ++++++++++++++++++++++++-
1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
index 86f355b6df1d..d8dfff0fdfce 100644
--- a/drivers/char/tpm/tpm_crb.c
+++ b/drivers/char/tpm/tpm_crb.c
@@ -479,10 +479,33 @@ static int crb_pm_runtime_resume(struct device *dev)

return crb_cmd_ready(dev, priv);
}
+
+static int crb_pm_suspend(struct device *dev)
+{
+ int ret;
+
+ ret = tpm_pm_suspend(dev);
+ if (ret)
+ return ret;
+
+ return crb_pm_runtime_suspend(dev);
+}
+
+static int crb_pm_resume(struct device *dev)
+{
+ int ret;
+
+ ret = crb_pm_runtime_resume(dev);
+ if (ret)
+ return ret;
+
+ return tpm_pm_resume(dev);
+}
+
#endif /* CONFIG_PM */

static const struct dev_pm_ops crb_pm = {
- SET_SYSTEM_SLEEP_PM_OPS(tpm_pm_suspend, tpm_pm_resume)
+ SET_SYSTEM_SLEEP_PM_OPS(crb_pm_suspend, crb_pm_resume)
SET_RUNTIME_PM_OPS(crb_pm_runtime_suspend, crb_pm_runtime_resume, NULL)
};

--
2.7.4
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