linux-kernel - [PATCH v5 02/15] USB: typec: Add cmd timeout and response delay

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Message-Id: <20230917152639.21443-3-alkuor@gmail.com>
Date:   Sun, 17 Sep 2023 11:26:26 -0400
From:   Abdel Alkuor <alkuor@...il.com>
To:     heikki.krogerus@...ux.intel.com, krzysztof.kozlowski+dt@...aro.org,
        bryan.odonoghue@...aro.org
Cc:     gregkh@...uxfoundation.org, robh+dt@...nel.org,
        linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
        conor+dt@...nel.org, linux-kernel@...r.kernel.org,
        abdelalkuor@...tab.com, Abdel Alkuor <alkuor@...il.com>
Subject: [PATCH v5 02/15] USB: typec: Add cmd timeout and response delay

Some commands in tps25750 take longer than 1 second
to complete, and some responses need some delay before
the result becomes available.

Signed-off-by: Abdel Alkuor <alkuor@...il.com>
---
 drivers/usb/typec/tipd/core.c | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/drivers/usb/typec/tipd/core.c b/drivers/usb/typec/tipd/core.c
index 37b56ce75f39..a8aee4e1aeba 100644
--- a/drivers/usb/typec/tipd/core.c
+++ b/drivers/usb/typec/tipd/core.c
@@ -284,7 +284,8 @@ static void tps6598x_disconnect(struct tps6598x *tps, u32 status)
 
 static int tps6598x_exec_cmd(struct tps6598x *tps, const char *cmd,
 			     size_t in_len, u8 *in_data,
-			     size_t out_len, u8 *out_data)
+			     size_t out_len, u8 *out_data,
+			     u32 cmd_timeout_ms, u32 res_delay_ms)
 {
 	unsigned long timeout;
 	u32 val;
@@ -307,8 +308,7 @@ static int tps6598x_exec_cmd(struct tps6598x *tps, const char *cmd,
 	if (ret < 0)
 		return ret;
 
-	/* XXX: Using 1s for now, but it may not be enough for every command. */
-	timeout = jiffies + msecs_to_jiffies(1000);
+	timeout = jiffies + msecs_to_jiffies(cmd_timeout_ms);
 
 	do {
 		ret = tps6598x_read32(tps, TPS_REG_CMD1, &val);
@@ -321,6 +321,9 @@ static int tps6598x_exec_cmd(struct tps6598x *tps, const char *cmd,
 			return -ETIMEDOUT;
 	} while (val);
 
+	/* some commands require delay for the result to be available */
+	mdelay(res_delay_ms);
+
 	if (out_len) {
 		ret = tps6598x_block_read(tps, TPS_REG_DATA1,
 					  out_data, out_len);
@@ -354,7 +357,7 @@ static int tps6598x_dr_set(struct typec_port *port, enum typec_data_role role)
 
 	mutex_lock(&tps->lock);
 
-	ret = tps6598x_exec_cmd(tps, cmd, 0, NULL, 0, NULL);
+	ret = tps6598x_exec_cmd(tps, cmd, 0, NULL, 0, NULL, 1000, 0);
 	if (ret)
 		goto out_unlock;
 
@@ -384,7 +387,7 @@ static int tps6598x_pr_set(struct typec_port *port, enum typec_role role)
 
 	mutex_lock(&tps->lock);
 
-	ret = tps6598x_exec_cmd(tps, cmd, 0, NULL, 0, NULL);
+	ret = tps6598x_exec_cmd(tps, cmd, 0, NULL, 0, NULL, 1000, 0);
 	if (ret)
 		goto out_unlock;
 
@@ -654,7 +657,10 @@ static int cd321x_switch_power_state(struct tps6598x *tps, u8 target_state)
 	if (state == target_state)
 		return 0;
 
-	ret = tps6598x_exec_cmd(tps, "SSPS", sizeof(u8), &target_state, 0, NULL);
+	ret = tps6598x_exec_cmd(tps, "SSPS",
+				sizeof(u8), &target_state,
+				0, NULL,
+				1000, 0);
 	if (ret)
 		return ret;
 
-- 
2.34.1