linux-kernel - [PATCH] i2c: designware: Get right data length

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Message-Id: <20210225023528.121135-1-zhangliguang@linux.alibaba.com>
Date:   Thu, 25 Feb 2021 10:35:28 +0800
From:   Liguang Zhang <zhangliguang@...ux.alibaba.com>
To:     Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Philipp Zabel <p.zabel@...gutronix.de>
Cc:     linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
        Liguang Zhang <zhangliguang@...ux.alibaba.com>
Subject: [PATCH] i2c: designware: Get right data length

IC_DATA_CMD[11] indicates the first data byte received after the address
phase for receive transfer in Master receiver or Slave receiver mode,
this bit was set in some transfer flow. IC_DATA_CMD[7:0] contains the
data to be transmitted or received on the I2C bus, so we should use the
lower 8 bits to get the right data length.

Signed-off-by: Liguang Zhang <zhangliguang@...ux.alibaba.com>
---
 drivers/i2c/busses/i2c-designware-master.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-designware-master.c b/drivers/i2c/busses/i2c-designware-master.c
index d6425ad6e6a3..c3cf76f6c607 100644
--- a/drivers/i2c/busses/i2c-designware-master.c
+++ b/drivers/i2c/busses/i2c-designware-master.c
@@ -432,7 +432,7 @@ i2c_dw_read(struct dw_i2c_dev *dev)
 			regmap_read(dev->map, DW_IC_DATA_CMD, &tmp);
 			/* Ensure length byte is a valid value */
 			if (flags & I2C_M_RECV_LEN &&
-			    tmp <= I2C_SMBUS_BLOCK_MAX && tmp > 0) {
+			    (tmp & 0xff) <= I2C_SMBUS_BLOCK_MAX && tmp > 0) {
 				len = i2c_dw_recv_len(dev, tmp);
 			}
 			*buf++ = tmp;
-- 
2.19.1.6.gb485710b