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From:   Tim Van Patten <timvp@chromium.org>
To:     LKML <linux-kernel@vger.kernel.org>
Cc:     rrangel@chromium.org, robbarnes@google.com, lalithkraj@google.com,
        Tim Van Patten <timvp@chromium.org>,
        Tim Van Patten <timvp@google.com>,
        Benson Leung <bleung@chromium.org>,
        Enric Balletbo i Serra <enric.balletbo@collabora.com>,
        Guenter Roeck <groeck@chromium.org>
Subject: [PATCH] [v10] platform/chrome: cros_ec_lpc: Move host command to prepare/complete
Date:   Thu, 18 May 2023 10:54:04 -0600
Message-ID: <20230518165408.1909613-1-timvp@chromium.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

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 command that the AP sends and allows the EC to log entry/exit of
AP's suspend/resume more accurately.

Additionally, if the EC monitors the AP's suspend/resume process with a
watchdog, this change allows the EC to cover more of the suspend/resume
process to detect any possible hang conditions and initiate error
recovery if it's implemented.

---


Changes in v10:
- Update commit message

Changes in v9:
- Remove log statements.
- Ignore return value from cros_ec_resume().

Changes in v8:
- Resend with chromium.org account.
- No code changes.

Changes in v7:
- Rename "host event" to "host command" in title/description.

Changes in v6:
- Fully restore fixes from v3.

Changes in v5:
- Restore fixes from v3.

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.

Signed-off-by: Tim Van Patten <timvp@chromium.org>
Reviewed-by: Raul E Rangel <rrangel@chromium.org>
Signed-off-by: Tim Van Patten <timvp@google.com>
---
 drivers/platform/chrome/cros_ec_lpc.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/platform/chrome/cros_ec_lpc.c b/drivers/platform/chrome/cros_ec_lpc.c
index ba4e3bff3db46..4e5a83a9936cd 100644
--- a/drivers/platform/chrome/cros_ec_lpc.c
+++ b/drivers/platform/chrome/cros_ec_lpc.c
@@ -519,23 +519,25 @@ static const struct dmi_system_id cros_ec_lpc_dmi_table[] __initconst = {
 MODULE_DEVICE_TABLE(dmi, cros_ec_lpc_dmi_table);
 
 #ifdef CONFIG_PM_SLEEP
-static int cros_ec_lpc_suspend(struct device *dev)
+static int cros_ec_lpc_prepare(struct device *dev)
 {
 	struct cros_ec_device *ec_dev = dev_get_drvdata(dev);
 
 	return cros_ec_suspend(ec_dev);
 }
 
-static int cros_ec_lpc_resume(struct device *dev)
+static void cros_ec_lpc_complete(struct device *dev)
 {
 	struct cros_ec_device *ec_dev = dev_get_drvdata(dev);
-
-	return cros_ec_resume(ec_dev);
+	cros_ec_resume(ec_dev);
 }
 #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_prepare,
+	.complete = cros_ec_lpc_complete
+#endif
 };
 
 static struct platform_driver cros_ec_lpc_driver = {
-- 
2.40.1.606.ga4b1b128d6-goog