[PATCH v2 3/8] mfd: cros_ec: Stop the debugfs work when suspended

From: Thierry Escande
Date: Fri Aug 11 2017 - 10:24:48 EST


From: Douglas Anderson <dianders@xxxxxxxxxxxx>

This patch stops the debugfs worker thread when the device is suspended.
This change avoids messages like:

cros-ec-spi spi5.0: spi transfer failed: -108
cros-ec-spi spi5.0: cs-deassert spi transfer failed: -108
cros-ec-ctl cros-ec-ctl.0.auto: EC communication failed

Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
Signed-off-by: Thierry Escande <thierry.escande@xxxxxxxxxxxxx>
---
drivers/platform/chrome/cros_ec_debugfs.c | 18 ++++++++++++++++++
drivers/platform/chrome/cros_ec_debugfs.h | 2 ++
drivers/platform/chrome/cros_ec_dev.c | 4 ++++
3 files changed, 24 insertions(+)

diff --git a/drivers/platform/chrome/cros_ec_debugfs.c b/drivers/platform/chrome/cros_ec_debugfs.c
index 4cc66f4..515f411 100644
--- a/drivers/platform/chrome/cros_ec_debugfs.c
+++ b/drivers/platform/chrome/cros_ec_debugfs.c
@@ -399,3 +399,21 @@ void cros_ec_debugfs_remove(struct cros_ec_dev *ec)
debugfs_remove_recursive(ec->debug_info->dir);
cros_ec_cleanup_console_log(ec->debug_info);
}
+
+void cros_ec_debugfs_suspend(struct cros_ec_dev *ec)
+{
+ /*
+ * cros_ec_debugfs_init() failures are non-fatal; it's also possible
+ * that we initted things but decided that console log wasn't supported.
+ * We'll use the same set of checks that cros_ec_debugfs_remove() +
+ * cros_ec_cleanup_console_log() end up using to handle those cases.
+ */
+ if (ec->debug_info && ec->debug_info->log_buffer.buf)
+ cancel_delayed_work_sync(&ec->debug_info->log_poll_work);
+}
+
+void cros_ec_debugfs_resume(struct cros_ec_dev *ec)
+{
+ if (ec->debug_info && ec->debug_info->log_buffer.buf)
+ schedule_delayed_work(&ec->debug_info->log_poll_work, 0);
+}
diff --git a/drivers/platform/chrome/cros_ec_debugfs.h b/drivers/platform/chrome/cros_ec_debugfs.h
index 1ff3a50..d29e410 100644
--- a/drivers/platform/chrome/cros_ec_debugfs.h
+++ b/drivers/platform/chrome/cros_ec_debugfs.h
@@ -23,5 +23,7 @@
/* debugfs stuff */
int cros_ec_debugfs_init(struct cros_ec_dev *ec);
void cros_ec_debugfs_remove(struct cros_ec_dev *ec);
+void cros_ec_debugfs_suspend(struct cros_ec_dev *ec);
+void cros_ec_debugfs_resume(struct cros_ec_dev *ec);

#endif /* _DRV_CROS_EC_DEBUGFS_H_ */
diff --git a/drivers/platform/chrome/cros_ec_dev.c b/drivers/platform/chrome/cros_ec_dev.c
index cf6c4f0..2571f5e 100644
--- a/drivers/platform/chrome/cros_ec_dev.c
+++ b/drivers/platform/chrome/cros_ec_dev.c
@@ -470,6 +470,8 @@ static __maybe_unused int ec_device_suspend(struct device *dev)
{
struct cros_ec_dev *ec = dev_get_drvdata(dev);

+ cros_ec_debugfs_suspend(ec);
+
lb_suspend(ec);

return 0;
@@ -481,6 +483,8 @@ static __maybe_unused int ec_device_resume(struct device *dev)

lb_resume(ec);

+ cros_ec_debugfs_resume(ec);
+
return 0;
}

--
2.7.4