[PATCH 2/2] ipmi: ssif_bmc: Add support for adjustable response timeout

[Potin Lai]

Implement support for the `timeout-ms` device tree property, allowing
platforms to adjust the userspace response timeout as needed.

If `timeout-ms` is not specified, the default response timeout remains
500 ms. This ensures compatibility while providing flexibility for
platforms that require longer timeouts due to BMC or application load.

Signed-off-by: Potin Lai <potin.lai.pt@xxxxxxxxx>
---
 drivers/char/ipmi/ssif_bmc.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/char/ipmi/ssif_bmc.c b/drivers/char/ipmi/ssif_bmc.c
index 310f17dd9511..8f0fbc941936 100644
--- a/drivers/char/ipmi/ssif_bmc.c
+++ b/drivers/char/ipmi/ssif_bmc.c
@@ -87,6 +87,7 @@ struct ssif_bmc_ctx {
 	/* Timeout waiting for response */
 	struct timer_list       response_timer;
 	bool                    response_timer_inited;
+	u32                     response_timeout;
 	/* Flag to identify a Multi-part Read Transaction */
 	bool                    is_singlepart_read;
 	u8                      nbytes_processed;
@@ -331,7 +332,8 @@ static void handle_request(struct ssif_bmc_ctx *ssif_bmc)
 		timer_setup(&ssif_bmc->response_timer, response_timeout, 0);
 		ssif_bmc->response_timer_inited = true;
 	}
-	mod_timer(&ssif_bmc->response_timer, jiffies + msecs_to_jiffies(RESPONSE_TIMEOUT));
+	mod_timer(&ssif_bmc->response_timer, jiffies +
+		  msecs_to_jiffies(ssif_bmc->response_timeout));
 }
 
 static void calculate_response_part_pec(struct ssif_part_buffer *part)
@@ -809,6 +811,10 @@ static int ssif_bmc_probe(struct i2c_client *client)
 	if (!ssif_bmc)
 		return -ENOMEM;
 
+	if (of_property_read_u32(client->dev.of_node, "timeout-ms",
+				 &ssif_bmc->response_timeout))
+		ssif_bmc->response_timeout = RESPONSE_TIMEOUT;
+
 	spin_lock_init(&ssif_bmc->lock);
 
 	init_waitqueue_head(&ssif_bmc->wait_queue);

-- 
2.31.1