linux-kernel - [PATCH] accel/amdxdna: Clear mailbox interrupt register during channel creation

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Message-ID: <20251107181115.1293158-1-lizhi.hou@amd.com>
Date: Fri, 7 Nov 2025 10:11:15 -0800
From: Lizhi Hou <lizhi.hou@....com>
To: <ogabbay@...nel.org>, <quic_jhugo@...cinc.com>,
	<maciej.falkowski@...ux.intel.com>, <dri-devel@...ts.freedesktop.org>
CC: Lizhi Hou <lizhi.hou@....com>, <linux-kernel@...r.kernel.org>,
	<max.zhen@....com>, <sonal.santan@....com>, <mario.limonciello@....com>
Subject: [PATCH] accel/amdxdna: Clear mailbox interrupt register during channel creation

The mailbox interrupt register is not always cleared when a mailbox channel
is created. This can leave stale interrupt states from previous operations.

Fix this by explicitly clearing the interrupt register in the mailbox
channel creation function.

Fixes: b87f920b9344 ("accel/amdxdna: Support hardware mailbox")
Signed-off-by: Lizhi Hou <lizhi.hou@....com>
---
 drivers/accel/amdxdna/amdxdna_mailbox.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/accel/amdxdna/amdxdna_mailbox.c b/drivers/accel/amdxdna/amdxdna_mailbox.c
index 24258dcc18eb..858df97cd3fb 100644
--- a/drivers/accel/amdxdna/amdxdna_mailbox.c
+++ b/drivers/accel/amdxdna/amdxdna_mailbox.c
@@ -516,6 +516,7 @@ xdna_mailbox_create_channel(struct mailbox *mb,
 	}
 
 	mb_chann->bad_state = false;
+	mailbox_reg_write(mb_chann, mb_chann->iohub_int_addr, 0);
 
 	MB_DBG(mb_chann, "Mailbox channel created (irq: %d)", mb_chann->msix_irq);
 	return mb_chann;
-- 
2.34.1