i2c: qup: use core to detect 'no zero length' quirk

And don't reimplement in the driver.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Andy Gross <andy.gross@linaro.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

diff --git a/drivers/i2c/busses/i2c-qup.c b/drivers/i2c/busses/i2c-qup.c
index c86c3ae1318f200696f909f7563c8a114ee30995..e09cd0775ae91c60e052b22a748d870dfe037f7a 100644 (file)
--- a/drivers/i2c/busses/i2c-qup.c
+++ b/drivers/i2c/busses/i2c-qup.c
@@ -1088,11 +1088,6 @@ static int qup_i2c_xfer(struct i2c_adapter *adap,
        writel(I2C_MINI_CORE | I2C_N_VAL, qup->base + QUP_CONFIG);
 
        for (idx = 0; idx < num; idx++) {
-               if (msgs[idx].len == 0) {
-                       ret = -EINVAL;
-                       goto out;
-               }
-
                if (qup_i2c_poll_state_i2c_master(qup)) {
                        ret = -EIO;
                        goto out;
@@ -1520,9 +1515,6 @@ qup_i2c_determine_mode_v2(struct qup_i2c_dev *qup,
 
        /* All i2c_msgs should be transferred using either dma or cpu */
        for (idx = 0; idx < num; idx++) {
-               if (msgs[idx].len == 0)
-                       return -EINVAL;
-
                if (msgs[idx].flags & I2C_M_RD)
                        max_rx_len = max_t(unsigned int, max_rx_len,
                                           msgs[idx].len);
@@ -1636,9 +1628,14 @@ static const struct i2c_algorithm qup_i2c_algo_v2 = {
  * which limits the possible read to 256 (QUP_READ_LIMIT) bytes.
  */
 static const struct i2c_adapter_quirks qup_i2c_quirks = {
+       .flags = I2C_AQ_NO_ZERO_LEN,
        .max_read_len = QUP_READ_LIMIT,
 };
 
+static const struct i2c_adapter_quirks qup_i2c_quirks_v2 = {
+       .flags = I2C_AQ_NO_ZERO_LEN,
+};
+
 static void qup_i2c_enable_clocks(struct qup_i2c_dev *qup)
 {
        clk_prepare_enable(qup->clk);
@@ -1701,6 +1698,7 @@ static int qup_i2c_probe(struct platform_device *pdev)
                is_qup_v1 = true;
        } else {
                qup->adap.algo = &qup_i2c_algo_v2;
+               qup->adap.quirks = &qup_i2c_quirks_v2;
                is_qup_v1 = false;
                if (acpi_match_device(qup_i2c_acpi_match, qup->dev))
                        goto nodma;