i2c: tegra: fix maximum transfer size

Tegra186 and prior supports maximum 4K bytes per packet transfer
including 12 bytes of packet header.

This patch fixes max write length limit to account packet header
size for transfers.

Cc: stable@vger.kernel.org # 4.4+
Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index a46446d..036cab7 100644 (file)
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -901,7 +901,7 @@ static const struct i2c_algorithm tegra_i2c_algo = {
 static const struct i2c_adapter_quirks tegra_i2c_quirks = {
        .flags = I2C_AQ_NO_ZERO_LEN,
        .max_read_len = 4096,
-       .max_write_len = 4096,
+       .max_write_len = 4096 - 12,
 };
 
 static const struct i2c_adapter_quirks tegra194_i2c_quirks = {