linux-kernel - [PATCH] platform/chrome: cros_ec: Send host event for prepare/complete

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Date:   Fri,  1 Jul 2022 09:54:23 -0600
From:   Tim Van Patten <timvp@...gle.com>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     robbarnes@...gle.com, rrangel@...omium.org,
        Tim Van Patten <timvp@...gle.com>,
        Benson Leung <bleung@...omium.org>,
        Guenter Roeck <groeck@...omium.org>,
        chrome-platform@...ts.linux.dev
Subject: [PATCH] platform/chrome: cros_ec: Send host event for prepare/complete

Update cros_ec_lpc_pm_ops to call cros_ec_lpc_suspend() during PM
.prepare() and cros_ec_lpc_resume() during .complete. This allows the
EC to log entry/exit of AP's suspend/resume more accurately.

Signed-off-by: Tim Van Patten <timvp@...gle.com>
---

 drivers/platform/chrome/cros_ec_lpc.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/platform/chrome/cros_ec_lpc.c b/drivers/platform/chrome/cros_ec_lpc.c
index 7677ab3c0ead9..783a0e56bf5f3 100644
--- a/drivers/platform/chrome/cros_ec_lpc.c
+++ b/drivers/platform/chrome/cros_ec_lpc.c
@@ -534,19 +534,24 @@ static int cros_ec_lpc_suspend(struct device *dev)
 {
 	struct cros_ec_device *ec_dev = dev_get_drvdata(dev);
 
+	dev_info(dev, "Prepare EC suspend\n");
+
 	return cros_ec_suspend(ec_dev);
 }
 
-static int cros_ec_lpc_resume(struct device *dev)
+static void cros_ec_lpc_resume(struct device *dev)
 {
 	struct cros_ec_device *ec_dev = dev_get_drvdata(dev);
 
-	return cros_ec_resume(ec_dev);
+	cros_ec_resume(ec_dev);
+
+	dev_info(dev, "EC resume completed\n");
 }
 #endif
 
 static const struct dev_pm_ops cros_ec_lpc_pm_ops = {
-	SET_LATE_SYSTEM_SLEEP_PM_OPS(cros_ec_lpc_suspend, cros_ec_lpc_resume)
+	.prepare = cros_ec_lpc_suspend,
+	.complete = cros_ec_lpc_resume
 };
 
 static struct platform_driver cros_ec_lpc_driver = {
-- 
2.37.0.rc0.161.g10f37bed90-goog