linux-kernel - [PATCH] bus: mhi: host: Use mhi_soc_reset() API in place of register write

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Message-Id: <1664272126-82706-1-git-send-email-quic_qianyu@quicinc.com>
Date:   Tue, 27 Sep 2022 17:48:46 +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: Use mhi_soc_reset() API in place of register write

Currently, a direct register write is used when ramdump collection
in panic path occurs. Replace that with new mhi_soc_reset() API
such that a controller defined reset() function is exercised if
one is present and the regular SOC reset is done if it is not.

Signed-off-by: Qiang Yu <quic_qianyu@...cinc.com>
---
 drivers/bus/mhi/host/boot.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/bus/mhi/host/boot.c b/drivers/bus/mhi/host/boot.c
index 5bed8b51..79a0eec 100644
--- a/drivers/bus/mhi/host/boot.c
+++ b/drivers/bus/mhi/host/boot.c
@@ -118,9 +118,7 @@ static int __mhi_download_rddm_in_panic(struct mhi_controller *mhi_cntrl)
 			/* Hardware reset so force device to enter RDDM */
 			dev_dbg(dev,
 				"Did not enter RDDM, do a host req reset\n");
-			mhi_write_reg(mhi_cntrl, mhi_cntrl->regs,
-				      MHI_SOC_RESET_REQ_OFFSET,
-				      MHI_SOC_RESET_REQ);
+			mhi_soc_reset(mhi_cntrl);
 			udelay(delayus);
 		}
 
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