linux-kernel - [PATCH v4 5/6] i3c: master: svc: fix SDA keep low when polling IBIWON timeout happen

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Message-Id: <20231023161658.3890811-6-Frank.Li@nxp.com>
Date:   Mon, 23 Oct 2023 12:16:57 -0400
From:   Frank Li <Frank.Li@....com>
To:     miquel.raynal@...tlin.com
Cc:     Frank.li@....com, alexandre.belloni@...tlin.com,
        conor.culhane@...vaco.com, imx@...ts.linux.dev, joe@...ches.com,
        linux-i3c@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v4 5/6] i3c: master: svc: fix SDA keep low when polling IBIWON timeout happen

Upon IBIWON timeout, the SDA line will always be kept low if we don't emit
a stop. Calling svc_i3c_master_emit_stop() there will let the bus return to
idle state.

Fixes: dd3c52846d59 ("i3c: master: svc: Add Silvaco I3C master driver")
Cc: stable@...r.kernel.org
Reviewed-by: Miquel Raynal <miquel.raynal@...tlin.com>
Signed-off-by: Frank Li <Frank.Li@....com>
---

Notes:
    Change from v3 to v4
    - remove duplidate in commit message
     Call svc_i3c_master_emit_stop() to let i3c bus come back to idle statue
     when IBIWON timeout happen.
    
    Change from v2 to v3
    - Update commit message and add review tag
    
    Change from v1 to v2
    - Update commite message
    
    Change from v1 to v2
    - Update commite message
    
    Change from v2 to v3
    - Update commit message and add review tag
    
    Change from v1 to v2
    - Update commite message
    
    Change from v1 to v2
    - Update commite message

 drivers/i3c/master/svc-i3c-master.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c
index b113460f059c3..1a57fdebaa26d 100644
--- a/drivers/i3c/master/svc-i3c-master.c
+++ b/drivers/i3c/master/svc-i3c-master.c
@@ -404,6 +404,7 @@ static void svc_i3c_master_ibi_work(struct work_struct *work)
 					 SVC_I3C_MSTATUS_IBIWON(val), 0, 1000);
 	if (ret) {
 		dev_err(master->dev, "Timeout when polling for IBIWON\n");
+		svc_i3c_master_emit_stop(master);
 		goto reenable_ibis;
 	}
 
-- 
2.34.1