[PATCH v3 1/2] platform/chrome: cros_ec: Add Type C hard reset

[PATCH v3 1/2] platform/chrome: cros_ec: Add Type C hard reset

[Prashant Malani]

Update the EC command header to include the new event bit. This bit
is included in the latest version of the Chrome EC headers[1].

[1] https://chromium.googlesource.com/chromiumos/platform/ec/+/refs/heads/main/include/ec_commands.h

Signed-off-by: Prashant Malani <pmalani@chromium.org>
---

Changes in v3:
- Remove Change-Id tag and add Signed-off-by tag to the commit message.

v2 is the first version the patch was introduced.

 include/linux/platform_data/cros_ec_commands.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/platform_data/cros_ec_commands.h b/include/linux/platform_data/cros_ec_commands.h
index 5ff8597ceabd..9156078c6fc6 100644
--- a/include/linux/platform_data/cros_ec_commands.h
+++ b/include/linux/platform_data/cros_ec_commands.h
@@ -5678,6 +5678,7 @@ enum tcpc_cc_polarity {
 
 #define PD_STATUS_EVENT_SOP_DISC_DONE		BIT(0)
 #define PD_STATUS_EVENT_SOP_PRIME_DISC_DONE	BIT(1)
+#define PD_STATUS_EVENT_HARD_RESET		BIT(2)
 
 struct ec_params_typec_status {
 	uint8_t port;
-- 
2.31.1.368.gbe11c130af-goog

[PATCH v3 2/2] platform/chrome: cros_ec_typec: Handle hard reset

[Prashant Malani]

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

Re: [PATCH v3 1/2] platform/chrome: cros_ec: Add Type C hard reset

[Enric Balletbo i Serra]

On Tue, 20 Apr 2021 10:16:11 -0700, Prashant Malani wrote:
> Update the EC command header to include the new event bit. This bit
> is included in the latest version of the Chrome EC headers[1].
> 
> [1] https://chromium.googlesource.com/chromiumos/platform/ec/+/refs/heads/main/include/ec_commands.h

Applied, thanks!

[1/2] platform/chrome: cros_ec: Add Type C hard reset
      commit: 67880f1bc342ed4c94e72cad7f8ca76e5121aae3
[2/2] platform/chrome: cros_ec_typec: Handle hard reset
      commit: 944b3a639573796debe3cd47298a5dd79810be73

Best regards,
-- 
Enric Balletbo i Serra <enric.balletbo@collabora.com>