platform/chrome: cros_ec_typec: Add DP mode check

[ Upstream commit c5bb32f57bf3a30ed03be51f7be0840325ba8b4a ]

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>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Link: https://lore.kernel.org/r/20210421042108.2002-1-pmalani@chromium.org
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
index 31be311..036d54d 100644 (file)
--- a/drivers/platform/chrome/cros_ec_typec.c
+++ b/drivers/platform/chrome/cros_ec_typec.c
@@ -475,6 +475,11 @@ 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)