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(wnpgmb0311w-ds01-161-217-39.dynamic.bellmts.net. [142.161.217.39]) by smtp.gmail.com with ESMTPSA id af79cd13be357-8cd6f54bb7csm782935785a.38.2026.03.09.19.23.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Mar 2026 19:23:12 -0700 (PDT) From: jassisinghbrar@gmail.com To: linux-kernel@vger.kernel.org Cc: dianders@chromium.org, shawn.guo@linaro.org, maz@kernel.org, stable@vger.kernel.org, andersson@kernel.org, Jassi Brar Subject: [PATCH] irqchip/qcom-mpm: Fix missing mailbox TX done acknowledgment Date: Mon, 9 Mar 2026 21:23:00 -0500 Message-ID: <20260310022300.311125-1-jassisinghbrar@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Jassi Brar The mbox_client for qcom-mpm sends NULL doorbell messages via mbox_send_message() but never signals TX completion. Set knows_txdone=3Dtrue and call mbox_client_txdone() after a successful send, matching the pattern used by other Qualcomm mailbox clients (smp2p, smsm, qcom_aoss etc) of similar controller. Fixes: a6199bb514d8a6 "irqchip: Add Qualcomm MPM controller driver" Signed-off-by: Jassi Brar Reviewed-by: Douglas Anderson --- 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 83f31ea657b7..181320528a47 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 *g= enpd) if (ret < 0) return ret; =20 + mbox_client_txdone(priv->mbox_chan, 0); + return 0; } =20 @@ -434,6 +436,7 @@ static int qcom_mpm_probe(struct platform_device *pdev,= struct device_node *pare } =20 priv->mbox_client.dev =3D dev; + priv->mbox_client.knows_txdone =3D true; priv->mbox_chan =3D mbox_request_channel(&priv->mbox_client, 0); if (IS_ERR(priv->mbox_chan)) { ret =3D PTR_ERR(priv->mbox_chan); --=20 2.43.0