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| author | addy ke <addy.ke@rock-chips.com> | 2014-08-23 02:00:52 +0800 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2014-09-02 14:29:28 +0200 |
| commit | 5da4309f9e1b4de9c2b69e917912fbb84006d44e (patch) | |
| tree | d9ec095fee0cf41764778c70edee0598831b5645 /drivers | |
| parent | 6721f28a26efd6368497abbdef5dcfc59608d899 (diff) | |
| download | linux-5da4309f9e1b4de9c2b69e917912fbb84006d44e.tar.gz linux-5da4309f9e1b4de9c2b69e917912fbb84006d44e.tar.bz2 linux-5da4309f9e1b4de9c2b69e917912fbb84006d44e.zip | |
i2c: rk3x: fix bug that cause transfer fails in master receive mode
In rk3x SOC, the I2C controller can receive/transmit up to 32 bytes data
in one chunk, so the size of data to be write/read to/from TXDATAx/RXDATAx
must be less than or equal 32 bytes at a time.
Tested on rk3288-pinky board, elan receive 158 bytes data.
Signed-off-by: Addy Ke <addy.ke@rock-chips.com>
Acked-by: Max Schwarz <max.schwarz@online.de>
Reviewed-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Cc: stable@kernel.org
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/i2c/busses/i2c-rk3x.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-rk3x.c b/drivers/i2c/busses/i2c-rk3x.c index 69e11853e8bf..e637c32ae517 100644 --- a/drivers/i2c/busses/i2c-rk3x.c +++ b/drivers/i2c/busses/i2c-rk3x.c @@ -323,6 +323,10 @@ static void rk3x_i2c_handle_read(struct rk3x_i2c *i2c, unsigned int ipd) /* ack interrupt */ i2c_writel(i2c, REG_INT_MBRF, REG_IPD); + /* Can only handle a maximum of 32 bytes at a time */ + if (len > 32) + len = 32; + /* read the data from receive buffer */ for (i = 0; i < len; ++i) { if (i % 4 == 0) |