linux-kernel - [PATCH AUTOSEL 6.6 184/294] i3c: master: svc: Flush FIFO before sending Dynamic Address Assignment(DAA)

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Message-Id: <20250505225634.2688578-184-sashal@kernel.org>
Date: Mon,  5 May 2025 18:54:44 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Frank Li <Frank.Li@....com>,
	Miquel Raynal <miquel.raynal@...tlin.com>,
	Alexandre Belloni <alexandre.belloni@...tlin.com>,
	Sasha Levin <sashal@...nel.org>,
	linux-i3c@...ts.infradead.org,
	imx@...ts.linux.dev
Subject: [PATCH AUTOSEL 6.6 184/294] i3c: master: svc: Flush FIFO before sending Dynamic Address Assignment(DAA)

From: Frank Li <Frank.Li@....com>

[ 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@....com>
Reviewed-by: Miquel Raynal <miquel.raynal@...tlin.com>
Link: https://lore.kernel.org/r/20250129162250.3629189-1-Frank.Li@nxp.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/i3c/master/svc-i3c-master.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c
index 3cef3794f10d3..3d1734849e0d9 100644
--- a/drivers/i3c/master/svc-i3c-master.c
+++ b/drivers/i3c/master/svc-i3c-master.c
@@ -841,6 +841,8 @@ 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 |
-- 
2.39.5