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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>,
        "Gustavo A. R. Silva" <gustavoars@kernel.org>,
        Mark Brown <broonie@kernel.org>,
        Pi-Hsun Shih <pihsun@chromium.org>,
        Utkarsh Patel <utkarsh.h.patel@intel.com>,
        Yu-Hsuan Hsu <yuhsuan@chromium.org>
Subject: [PATCH v3 2/2] platform/chrome: cros_ec_typec: Handle hard reset
Date:   Tue, 20 Apr 2021 10:16:13 -0700
Message-Id: <20210420171617.3830902-2-pmalani@chromium.org>
In-Reply-To: <20210420171617.3830902-1-pmalani@chromium.org>
References: <20210420171617.3830902-1-pmalani@chromium.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

The Chrome Embedded Controller (EC) generates a hard reset type C event
when a USB Power Delivery (PD) hard reset is encountered. Handle this
event by unregistering the partner and cable on the associated port and
clearing the event flag.

Cc: Benson Leung <bleung@chromium.org>
Signed-off-by: Prashant Malani <pmalani@chromium.org>
---

Changes in v3:
- No changes.

Changes in v2:
- Split the header change into a separate patch.
- Updated the commit message to reflect the above.

v1:
https://lore.kernel.org/lkml/20210415021456.1805797-1-pmalani@chromium.org/

 drivers/platform/chrome/cros_ec_typec.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
index d3df1717a5fd..22052f569f2a 100644
--- a/drivers/platform/chrome/cros_ec_typec.c
+++ b/drivers/platform/chrome/cros_ec_typec.c
@@ -905,6 +905,19 @@ static void cros_typec_handle_status(struct cros_typec_data *typec, int port_num
 		return;
 	}
 
+	/* If we got a hard reset, unregister everything and return. */
+	if (resp.events & PD_STATUS_EVENT_HARD_RESET) {
+		cros_typec_remove_partner(typec, port_num);
+		cros_typec_remove_cable(typec, port_num);
+
+		ret = cros_typec_send_clear_event(typec, port_num,
+						  PD_STATUS_EVENT_HARD_RESET);
+		if (ret < 0)
+			dev_warn(typec->dev,
+				 "Failed hard reset event clear, port: %d\n", port_num);
+		return;
+	}
+
 	/* Handle any events appropriately. */
 	if (resp.events & PD_STATUS_EVENT_SOP_DISC_DONE && !typec->ports[port_num]->sop_disc_done) {
 		u16 sop_revision;
-- 
2.31.1.368.gbe11c130af-goog