From: Frank Li <Frank.Li@nxp.com>
Date: Wed, 29 Jan 2025 16:22:50 +0000 (-0500)
Subject: i3c: master: svc: Flush FIFO before sending Dynamic Address Assignment(DAA)
X-Git-Tag: v6.1.141~171
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=74db6edb69a3e715e03aaa5dc1f63661fb0990f5;p=thirdparty%2Fkernel%2Fstable.git

i3c: master: svc: Flush FIFO before sending Dynamic Address Assignment(DAA)

[ Upstream commit a892ee4cf22a50e1d6988d0464a9a421f3e5db2f ]

Ensure the FIFO is empty before issuing the DAA command to prevent
incorrect command data from being sent. Align with other data transfers,
such as svc_i3c_master_start_xfer_locked(), which flushes the FIFO before
sending a command.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/20250129162250.3629189-1-Frank.Li@nxp.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c
index cf0550c6e95f0..8cf3aa800d89d 100644
--- a/drivers/i3c/master/svc-i3c-master.c
+++ b/drivers/i3c/master/svc-i3c-master.c
@@ -833,6 +833,8 @@ static int svc_i3c_master_do_daa_locked(struct svc_i3c_master *master,
 	u32 reg;
 	int ret, i;
 
+	svc_i3c_master_flush_fifo(master);
+
 	while (true) {
 		/* Enter/proceed with DAA */
 		writel(SVC_I3C_MCTRL_REQUEST_PROC_DAA |