linux-kernel - [PATCH v4] platform/chrome: cros_ec_lpc: Move host event to prepare/complete

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Date:   Mon, 22 Aug 2022 10:28:20 -0600
From:   Tim Van Patten <timvp@...gle.com>
To:     rrangel@...omium.org, robbarnes@...gle.com
Cc:     Tim Van Patten <timvp@...gle.com>,
        Benson Leung <bleung@...omium.org>,
        Guenter Roeck <groeck@...omium.org>,
        chrome-platform@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: [PATCH v4] platform/chrome: cros_ec_lpc: Move host event to prepare/complete

Update cros_ec_lpc_pm_ops to call cros_ec_lpc_prepare() during PM
.prepare() and cros_ec_lpc_complete() during .complete(). This moves the
host event that the AP sends and allows the EC to log entry/exit of AP's
suspend/resume more accurately.

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

Changes in v4:
- Update title and description.

Changes in v3:
- Update cros_ec_lpc_suspend() to cros_ec_lpc_prepare()
- Update cros_ec_lpc_resume() to cros_ec_lpc_complete()

Changes in v2:
- Include cros_ec_resume() return value in dev_info() output.
- Guard setting .prepare/.complete with #ifdef CONFIG_PM_SLEEP.

 drivers/platform/chrome/cros_ec_lpc.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/platform/chrome/cros_ec_lpc.c b/drivers/platform/chrome/cros_ec_lpc.c
index 7677ab3c0ead..ce49fbc4ed2e 100644
--- a/drivers/platform/chrome/cros_ec_lpc.c
+++ b/drivers/platform/chrome/cros_ec_lpc.c
@@ -534,19 +534,27 @@ 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);
+	int ret;
+
+	ret = cros_ec_resume(ec_dev);
 
-	return cros_ec_resume(ec_dev);
+	dev_info(dev, "EC resume completed: ret = %d\n", ret);
 }
 #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)
+#ifdef CONFIG_PM_SLEEP
+	.prepare = cros_ec_lpc_suspend,
+	.complete = cros_ec_lpc_resume
+#endif
 };
 
 static struct platform_driver cros_ec_lpc_driver = {
-- 
2.37.1.595.g718a3a8f04-goog