linux-kernel - [PATCH] bus: mhi: host: Add session ID to MHI controller

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Message-Id: <1665376870-60668-1-git-send-email-quic_qianyu@quicinc.com>
Date:   Mon, 10 Oct 2022 12:41:10 +0800
From:   Qiang Yu <quic_qianyu@...cinc.com>
To:     mani@...nel.org, quic_hemantk@...cinc.com, loic.poulain@...aro.org
Cc:     mhi@...ts.linux.dev, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, quic_cang@...cinc.com,
        mrana@...cinc.com, Qiang Yu <quic_qianyu@...cinc.com>
Subject: [PATCH] bus: mhi: host: Add session ID to MHI controller

Session ID to be used during BHI transfers to recognize a
particular session are currently not being stored in the MHI
controller structure. Store them to allow for tracking and other
future usage.

Signed-off-by: Qiang Yu <quic_qianyu@...cinc.com>
---
 drivers/bus/mhi/host/boot.c | 8 ++++----
 include/linux/mhi.h         | 1 +
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/bus/mhi/host/boot.c b/drivers/bus/mhi/host/boot.c
index 26d0edd..5bed8b51 100644
--- a/drivers/bus/mhi/host/boot.c
+++ b/drivers/bus/mhi/host/boot.c
@@ -231,7 +231,7 @@ static int mhi_fw_load_bhi(struct mhi_controller *mhi_cntrl,
 			   dma_addr_t dma_addr,
 			   size_t size)
 {
-	u32 tx_status, val, session_id;
+	u32 tx_status, val;
 	int i, ret;
 	void __iomem *base = mhi_cntrl->bhi;
 	rwlock_t *pm_lock = &mhi_cntrl->pm_lock;
@@ -253,16 +253,16 @@ static int mhi_fw_load_bhi(struct mhi_controller *mhi_cntrl,
 		goto invalid_pm_state;
 	}
 
-	session_id = MHI_RANDOM_U32_NONZERO(BHI_TXDB_SEQNUM_BMSK);
+	mhi_cntrl->session_id = MHI_RANDOM_U32_NONZERO(BHI_TXDB_SEQNUM_BMSK);
 	dev_dbg(dev, "Starting image download via BHI. Session ID: %u\n",
-		session_id);
+		mhi_cntrl->session_id);
 	mhi_write_reg(mhi_cntrl, base, BHI_STATUS, 0);
 	mhi_write_reg(mhi_cntrl, base, BHI_IMGADDR_HIGH,
 		      upper_32_bits(dma_addr));
 	mhi_write_reg(mhi_cntrl, base, BHI_IMGADDR_LOW,
 		      lower_32_bits(dma_addr));
 	mhi_write_reg(mhi_cntrl, base, BHI_IMGSIZE, size);
-	mhi_write_reg(mhi_cntrl, base, BHI_IMGTXDB, session_id);
+	mhi_write_reg(mhi_cntrl, base, BHI_IMGTXDB, mhi_cntrl->session_id);
 	read_unlock_bh(pm_lock);
 
 	/* Wait for the image download to complete */
diff --git a/include/linux/mhi.h b/include/linux/mhi.h
index a5441ad..8b3c934 100644
--- a/include/linux/mhi.h
+++ b/include/linux/mhi.h
@@ -405,6 +405,7 @@ struct mhi_controller {
 	u32 minor_version;
 	u32 serial_number;
 	u32 oem_pk_hash[MHI_MAX_OEM_PK_HASH_SEGMENTS];
+	u32 session_id;
 
 	struct mhi_event *mhi_event;
 	struct mhi_cmd *mhi_cmd;
-- 
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