Thread (15 messages) 15 messages, 3 authors, 2025-02-26

Re: [PATCH v4 5/5] i3c: master: svc: Fix npcm845 DAA process corruption

From: Frank Li <Frank.li@nxp.com>
Date: 2025-02-24 16:35:24
Also in: linux-i3c, lkml

On Mon, Feb 24, 2025 at 04:39:08PM +0800, Stanley Chu wrote:
From: Stanley Chu <yschu@nuvoton.com>

When MCONFIG.SKEW=0 and MCONFIG.ODHPP=0, the ENTDAA transaction gets
corrupted and results in a no repeated-start condition at the end of
address assignment.
If there are errata doc, provide a link will be appeciated.
Workaround: Set MCONFIG.SKEW to 1 before initiating the DAA process.
After the DAA process is completed, return MCONFIG.SKEW to its previous
value.

Signed-off-by: Stanley Chu <yschu@nuvoton.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
quoted hunk ↗ jump to hunk
---
 drivers/i3c/master/svc-i3c-master.c | 9 +++++++++
 1 file changed, 9 insertions(+)
diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c
index 4eb4b8888725..403d625e999e 100644
--- a/drivers/i3c/master/svc-i3c-master.c
+++ b/drivers/i3c/master/svc-i3c-master.c
@@ -1162,7 +1162,16 @@ static int svc_i3c_master_do_daa(struct i3c_master_controller *m)
 	}

 	spin_lock_irqsave(&master->xferqueue.lock, flags);
+
+	if (svc_has_quirk(master, SVC_I3C_QUIRK_DAA_CORRUPT))
+		writel(master->mctrl_config | SVC_I3C_MCONFIG_SKEW(1),
+		       master->regs + SVC_I3C_MCONFIG);
+
 	ret = svc_i3c_master_do_daa_locked(master, addrs, &dev_nb);
+
+	if (svc_has_quirk(master, SVC_I3C_QUIRK_DAA_CORRUPT))
+		writel(master->mctrl_config, master->regs + SVC_I3C_MCONFIG);
+
 	spin_unlock_irqrestore(&master->xferqueue.lock, flags);

 	svc_i3c_master_clear_merrwarn(master);
--
2.34.1
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