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[1/1] i3c: master: svc: Flush FIFO before sending Dynamic Address Assignment(DAA)

Message ID 20250129162250.3629189-1-Frank.Li@nxp.com (mailing list archive)
State New
Headers show
Series [1/1] i3c: master: svc: Flush FIFO before sending Dynamic Address Assignment(DAA) | expand

Commit Message

Frank Li Jan. 29, 2025, 4:22 p.m. UTC 
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>
---
Hotplug stress test find a wrong byte send out, this patch can resolve
this issue although have not identify which operation cause a byte left in
FIFO.
---
 drivers/i3c/master/svc-i3c-master.c | 2 ++
 1 file changed, 2 insertions(+)
diff mbox series

Patch

diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c
index c1ee3828e7eec..bb660c4dcce56 100644
--- a/drivers/i3c/master/svc-i3c-master.c
+++ b/drivers/i3c/master/svc-i3c-master.c
@@ -892,6 +892,8 @@  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) {
 		/* clean SVC_I3C_MINT_IBIWON w1c bits */
 		writel(SVC_I3C_MINT_IBIWON, master->regs + SVC_I3C_MSTATUS);