linux-kernel - [PATCH] usb: typec: intel_pmc_mux: Defer probe if SCU IPC isn't present

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Message-ID: <20250610154058.1859812-1-tmichalec@google.com>
Date: Tue, 10 Jun 2025 17:40:58 +0200
From: Tomasz Michalec <tmichalec@...gle.com>
To: Heikki Krogerus <heikki.krogerus@...ux.intel.com>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Konrad Adamczyk <konrada@...gle.com>, linux-usb@...r.kernel.org, 
	linux-kernel@...r.kernel.org, chromeos-krk-upstreaming@...gle.com, 
	Tomasz Michalec <tmichalec@...gle.com>
Subject: [PATCH] usb: typec: intel_pmc_mux: Defer probe if SCU IPC isn't present

If pmc_usb_probe is called before SCU IPC is registered, pmc_usb_probe
will fail.

Return -EPROBE_DEFER when pmc_usb_probe doesn't get SCU IPC device, so
the probe function can be called again after SCU IPC is initialized.

Signed-off-by: Tomasz Michalec <tmichalec@...gle.com>
---
 drivers/usb/typec/mux/intel_pmc_mux.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/typec/mux/intel_pmc_mux.c b/drivers/usb/typec/mux/intel_pmc_mux.c
index 65dda9183e6f..1698428654ab 100644
--- a/drivers/usb/typec/mux/intel_pmc_mux.c
+++ b/drivers/usb/typec/mux/intel_pmc_mux.c
@@ -754,7 +754,7 @@ static int pmc_usb_probe(struct platform_device *pdev)
 
 	pmc->ipc = devm_intel_scu_ipc_dev_get(&pdev->dev);
 	if (!pmc->ipc)
-		return -ENODEV;
+		return -EPROBE_DEFER;
 
 	pmc->dev = &pdev->dev;
 
-- 
2.50.0.rc0.604.gd4ff7b7c86-goog