[tip: irq/urgent] irqchip/qcom-mpm: Add missing mailbox TX done acknowledgment

["tip-bot2 for Jassi Brar" <tip-bot2@linutronix.de>]

The following commit has been merged into the irq/urgent branch of tip:

Commit-ID:     213a1f66341adf9e911b5c887970f209c132c4c0
Gitweb:        https://git.kernel.org/tip/213a1f66341adf9e911b5c887970f209c132c4c0
Author:        Jassi Brar <jassisinghbrar@gmail.com>
AuthorDate:    Sun, 22 Mar 2026 12:15:33 -05:00
Committer:     Thomas Gleixner <tglx@kernel.org>
CommitterDate: Tue, 24 Mar 2026 17:03:26 +01:00

irqchip/qcom-mpm: Add missing mailbox TX done acknowledgment

The mbox_client for qcom-mpm sends NULL doorbell messages via
mbox_send_message() but never signals TX completion.

Set knows_txdone=true and call mbox_client_txdone() after a successful
send, matching the pattern used by other Qualcomm mailbox clients (smp2p,
smsm, qcom_aoss etc).

Fixes: a6199bb514d8a6 "irqchip: Add Qualcomm MPM controller driver"
Signed-off-by: Jassi Brar <jassisinghbrar@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260322171533.608436-1-jassisinghbrar@gmail.com
---
 drivers/irqchip/irq-qcom-mpm.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/irqchip/irq-qcom-mpm.c b/drivers/irqchip/irq-qcom-mpm.c
index 83f31ea..1813205 100644
--- a/drivers/irqchip/irq-qcom-mpm.c
+++ b/drivers/irqchip/irq-qcom-mpm.c
@@ -306,6 +306,8 @@ static int mpm_pd_power_off(struct generic_pm_domain *genpd)
 	if (ret < 0)
 		return ret;
 
+	mbox_client_txdone(priv->mbox_chan, 0);
+
 	return 0;
 }
 
@@ -434,6 +436,7 @@ static int qcom_mpm_probe(struct platform_device *pdev, struct device_node *pare
 	}
 
 	priv->mbox_client.dev = dev;
+	priv->mbox_client.knows_txdone = true;
 	priv->mbox_chan = mbox_request_channel(&priv->mbox_client, 0);
 	if (IS_ERR(priv->mbox_chan)) {
 		ret = PTR_ERR(priv->mbox_chan);