linux-kernel - [PATCH 04/11] Revert "bus: mhi: host: Remove mhi

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Message-Id: <20251211-siva_mhi_dp2-v1-4-d2895c4ec73a@oss.qualcomm.com>
Date: Thu, 11 Dec 2025 13:37:36 +0530
From: Sivareddy Surasani <sivareddy.surasani@....qualcomm.com>
To: Manivannan Sadhasivam <mani@...nel.org>, Jonathan Corbet <corbet@....net>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: mhi@...ts.linux.dev, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        Upal Kumar Saha <upal.saha@....qualcomm.com>,
        Himanshu Shukla <quic_himashuk@...cinc.com>,
        Sivareddy Surasani <sivareddy.surasani@....qualcomm.com>,
        Vivek Pernamitta <vivek.pernamitta@....qualcomm.com>
Subject: [PATCH 04/11] Revert "bus: mhi: host: Remove mhi_poll() API"

From: Vivek Pernamitta <vivek.pernamitta@....qualcomm.com>

Revert commit 5da094ac80cd ("bus: mhi: host: Remove mhi_poll() API")

Add mhi_poll() API. New hardware channel clients use mhi_poll() to manage
their own completion events instead of relying on the MHI core driver for
notifications.

Signed-off-by: Vivek Pernamitta <vivek.pernamitta@....qualcomm.com>
Signed-off-by: Sivareddy Surasani <sivareddy.surasani@....qualcomm.com>
---
 drivers/bus/mhi/host/main.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/bus/mhi/host/main.c b/drivers/bus/mhi/host/main.c
index 7beb848ca5c1..5d50f6ebf6f9 100644
--- a/drivers/bus/mhi/host/main.c
+++ b/drivers/bus/mhi/host/main.c
@@ -1858,3 +1858,18 @@ int mhi_get_channel_doorbell_offset(struct mhi_controller *mhi_cntrl, u32 *chdb_
 	return 0;
 }
 EXPORT_SYMBOL_GPL(mhi_get_channel_doorbell_offset);
+
+int mhi_poll(struct mhi_device *mhi_dev, u32 budget)
+{
+	struct mhi_controller *mhi_cntrl = mhi_dev->mhi_cntrl;
+	struct mhi_chan *mhi_chan = mhi_dev->dl_chan;
+	struct mhi_event *mhi_event = &mhi_cntrl->mhi_event[mhi_chan->er_index];
+	int ret;
+
+	spin_lock_bh(&mhi_event->lock);
+	ret = mhi_event->process_event(mhi_cntrl, mhi_event, budget);
+	spin_unlock_bh(&mhi_event->lock);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(mhi_poll);

-- 
2.34.1