linux-kernel - [PATCH] usb: typec: tipd: Separate reset for TPS6598x

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Date: Fri, 5 Jan 2024 14:36:54 +0530
From: Jai Luthra <j-luthra@...com>
To: Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman
	<gregkh@...uxfoundation.org>,
        Javier Carrasco
	<javier.carrasco@...fvision.net>
CC: <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <rogerq@...nel.org>, <r-gunasekaran@...com>, <vigneshr@...com>,
        <d-gole@...com>, Jai Luthra <j-luthra@...com>
Subject: [PATCH] usb: typec: tipd: Separate reset for TPS6598x

Some platforms like SK-AM62, SK-AM62A cannot boot up to prompt if
TPS6598x is cold-reset during unconditionally on probe failures by
sending "GAID" sequence.

The probe can fail initially because USB0 remote-endpoint may not be
probed yet, which defines the usb-role-switch property.

Fixes: d49f90822015 ("usb: typec: tipd: add init and reset functions to tipd_data")
Closes: https://lore.kernel.org/linux-usb/vmngazj6si7xxss7txenezkcukqje2glhvvs7ipdcx3vjiqvlk@ohmmhhhlryws/
Signed-off-by: Jai Luthra <j-luthra@...com>
---
Boot-logs with this patch applied:
https://gist.github.com/jailuthra/b66d5722090ce1fbc2886986e53640f7
---
 drivers/usb/typec/tipd/core.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/typec/tipd/core.c b/drivers/usb/typec/tipd/core.c
index a956eb976906..8ba2aa05db51 100644
--- a/drivers/usb/typec/tipd/core.c
+++ b/drivers/usb/typec/tipd/core.c
@@ -1223,11 +1223,16 @@ static int cd321x_reset(struct tps6598x *tps)
 	return 0;
 }
 
-static int tps6598x_reset(struct tps6598x *tps)
+static int tps25750_reset(struct tps6598x *tps)
 {
 	return tps6598x_exec_cmd_tmo(tps, "GAID", 0, NULL, 0, NULL, 2000, 0);
 }
 
+static int tps6598x_reset(struct tps6598x *tps)
+{
+	return 0;
+}
+
 static int
 tps25750_register_port(struct tps6598x *tps, struct fwnode_handle *fwnode)
 {
@@ -1545,7 +1550,7 @@ static const struct tipd_data tps25750_data = {
 	.trace_status = trace_tps25750_status,
 	.apply_patch = tps25750_apply_patch,
 	.init = tps25750_init,
-	.reset = tps6598x_reset,
+	.reset = tps25750_reset,
 };
 
 static const struct of_device_id tps6598x_of_match[] = {

---
base-commit: e2425464bc87159274879ab30f9d4fe624b9fcd2
change-id: 20240105-next-tps-fix-904ed92bc1cc

Best regards,
-- 
Jai Luthra <j-luthra@...com>