From 22dda3e4f8219bc502c439277df3a15e9235a7ec Mon Sep 17 00:00:00 2001
From: Wolfram Sang <wsa+renesas@sang-engineering.com>
Date: Mon, 23 Jul 2018 22:26:09 +0200
Subject: [PATCH] i2c: pmcmsp: 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>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
---
drivers/i2c/busses/i2c-pmcmsp.c | 17 +----------------
1 file changed, 1 insertion(+), 16 deletions(-)
diff --git a/drivers/i2c/busses/i2c-pmcmsp.c b/drivers/i2c/busses/i2c-pmcmsp.c
index dae8ac618a5221..0829cb696d9d4a 100644
--- a/drivers/i2c/busses/i2c-pmcmsp.c
+++ b/drivers/i2c/busses/i2c-pmcmsp.c
@@ -444,16 +444,6 @@ static enum pmcmsptwi_xfer_result pmcmsptwi_xfer_cmd(
{
enum pmcmsptwi_xfer_result retval;
- if ((cmd->type == MSP_TWI_CMD_WRITE && cmd->write_len == 0) ||
- (cmd->type == MSP_TWI_CMD_READ && cmd->read_len == 0) ||
- (cmd->type == MSP_TWI_CMD_WRITE_READ &&
- (cmd->read_len == 0 || cmd->write_len == 0))) {
- dev_err(&pmcmsptwi_adapter.dev,
- "%s: Cannot transfer less than 1 byte\n",
- __func__);
- return -EINVAL;
- }
-
mutex_lock(&data->lock);
dev_dbg(&pmcmsptwi_adapter.dev,
"Setting address to 0x%04x\n", cmd->addr);
@@ -532,11 +522,6 @@ static int pmcmsptwi_master_xfer(struct i2c_adapter *adap,
cmd.write_data = msg->buf;
}
- if (msg->len == 0) {
- dev_err(&adap->dev, "Zero-byte messages unsupported\n");
- return -EINVAL;
- }
-
cmd.addr = msg->addr;
if (msg->flags & I2C_M_TEN) {
@@ -578,7 +563,7 @@ static u32 pmcmsptwi_i2c_func(struct i2c_adapter *adapter)
}
static const struct i2c_adapter_quirks pmcmsptwi_i2c_quirks = {
- .flags = I2C_AQ_COMB_WRITE_THEN_READ,
+ .flags = I2C_AQ_COMB_WRITE_THEN_READ | I2C_AQ_NO_ZERO_LEN,
.max_write_len = MSP_MAX_BYTES_PER_RW,
.max_read_len = MSP_MAX_BYTES_PER_RW,
.max_comb_1st_msg_len = MSP_MAX_BYTES_PER_RW,
--
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