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From: Prashant Malani <pmalani@chromium.org>
To: linux-kernel@vger.kernel.org
Cc: Prashant Malani <pmalani@chromium.org>,
	Benson Leung <bleung@chromium.org>,
	Enric Balletbo i Serra <enric.balletbo@collabora.com>,
	Guenter Roeck <groeck@chromium.org>
Subject: [PATCH] platform/chrome: cros_ec_typec: Add DP mode check
Date: Tue, 20 Apr 2021 21:21:09 -0700	[thread overview]
Message-ID: <20210421042108.2002-1-pmalani@chromium.org> (raw)

There are certain transitional situations where the dp_mode field in the
PD_CONTROL response might not be populated with the right DP pin
assignment value yet. Add a check for that to avoid sending an invalid
value to the Type C mode switch.

Signed-off-by: Prashant Malani <pmalani@chromium.org>
---
 drivers/platform/chrome/cros_ec_typec.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
index d3df1717a5fd..69646262fa9d 100644
--- a/drivers/platform/chrome/cros_ec_typec.c
+++ b/drivers/platform/chrome/cros_ec_typec.c
@@ -486,6 +486,11 @@ static int cros_typec_enable_dp(struct cros_typec_data *typec,
 		return -ENOTSUPP;
 	}
 
+	if (!pd_ctrl->dp_mode) {
+		dev_err(typec->dev, "No valid DP mode provided.\n");
+		return -EINVAL;
+	}
+
 	/* Status VDO. */
 	dp_data.status = DP_STATUS_ENABLED;
 	if (port->mux_flags & USB_PD_MUX_HPD_IRQ)
-- 
2.31.1.368.gbe11c130af-goog


             reply	other threads:[~2021-04-21  4:21 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-21  4:21 Prashant Malani [this message]
2021-04-23  6:57 ` [PATCH] platform/chrome: cros_ec_typec: Add DP mode check Enric Balletbo i Serra

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