linux-kernel - [PATCH] platform/chrome: cros_ec_typec: deferred probe when typec count mismatch

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Message-Id: <20221220055954.11197-1-zhouruihai@huaqin.corp-partner.google.com>
Date:   Tue, 20 Dec 2022 13:59:54 +0800
From:   Ruihai Zhou <zhouruihai@...qin.corp-partner.google.com>
To:     pmalani@...omium.org, bleung@...omium.org, groeck@...omium.org,
        knoxchiou@...omium.org, weishunc@...omium.org
Cc:     chrome-platform@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Ruihai Zhou <zhouruihai@...qin.corp-partner.google.com>
Subject: [PATCH] platform/chrome: cros_ec_typec: deferred probe when typec count mismatch

The kernel bootup is much faster with normal mode. In this case,
there is a chance that the cros-ec-typec module get the actual typec
port counts but not accurate from ec before ec is able to setup it.
It will block the HDMI mux function.
Hence, return -EPROBE_DEFER to put the device onto the deferred probe
list when the typec count mismatch between ec and node.

Signed-off-by: Ruihai Zhou <zhouruihai@...qin.corp-partner.google.com>
---
 drivers/platform/chrome/cros_ec_typec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
index 59de4ce01fab..d821501e875c 100644
--- a/drivers/platform/chrome/cros_ec_typec.c
+++ b/drivers/platform/chrome/cros_ec_typec.c
@@ -382,7 +382,7 @@ static int cros_typec_init_ports(struct cros_typec_data *typec)
 
 	if (nports > typec->num_ports) {
 		dev_err(dev, "More ports listed than can be supported.\n");
-		return -EINVAL;
+		return -EPROBE_DEFER;
 	}
 
 	/* DT uses "reg" to specify port number. */
-- 
2.17.1