linux-kernel - [PATCH 5.8 047/177] i2c: npcm7xx: Fix timeout calculation

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Message-Id: <20200915140655.878792942@linuxfoundation.org>
Date:   Tue, 15 Sep 2020 16:11:58 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Tali Perry <tali.perry1@...il.com>,
        Avi Fishman <avifishman70@...il.com>,
        Joel Stanley <joel@....id.au>, Alex Qiu <xqiu@...gle.com>,
        Wolfram Sang <wsa@...nel.org>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.8 047/177] i2c: npcm7xx: Fix timeout calculation

From: Tali Perry <tali.perry1@...il.com>

[ Upstream commit 06be67266a0c9a6a1ffb330a4ab50c2f21612e2b ]

timeout_usec value calculation was wrong, the calculated value
was in msec instead of usec.

Fixes: 56a1485b102e ("i2c: npcm7xx: Add Nuvoton NPCM I2C controller driver")
Signed-off-by: Tali Perry <tali.perry1@...il.com>
Reviewed-by: Avi Fishman <avifishman70@...il.com>
Reviewed-by: Joel Stanley <joel@....id.au>
Reviewed-by: Alex Qiu <xqiu@...gle.com>
Signed-off-by: Wolfram Sang <wsa@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/i2c/busses/i2c-npcm7xx.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/i2c/busses/i2c-npcm7xx.c b/drivers/i2c/busses/i2c-npcm7xx.c
index 75f07138a6fa2..dfcf04e1967f1 100644
--- a/drivers/i2c/busses/i2c-npcm7xx.c
+++ b/drivers/i2c/busses/i2c-npcm7xx.c
@@ -2093,8 +2093,12 @@ static int npcm_i2c_master_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
 		}
 	}
 
-	/* Adaptive TimeOut: astimated time in usec + 100% margin */
-	timeout_usec = (2 * 10000 / bus->bus_freq) * (2 + nread + nwrite);
+	/*
+	 * Adaptive TimeOut: estimated time in usec + 100% margin:
+	 * 2: double the timeout for clock stretching case
+	 * 9: bits per transaction (including the ack/nack)
+	 */
+	timeout_usec = (2 * 9 * USEC_PER_SEC / bus->bus_freq) * (2 + nread + nwrite);
 	timeout = max(msecs_to_jiffies(35), usecs_to_jiffies(timeout_usec));
 	if (nwrite >= 32 * 1024 || nread >= 32 * 1024) {
 		dev_err(bus->dev, "i2c%d buffer too big\n", bus->num);
-- 
2.25.1