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i2c: sh_mobile: use core to detect 'no zero length read' quirk
And don't reimplement in the driver. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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@ -613,11 +613,6 @@ static void sh_mobile_i2c_xfer_dma(struct sh_mobile_i2c_data *pd)
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static int start_ch(struct sh_mobile_i2c_data *pd, struct i2c_msg *usr_msg,
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bool do_init)
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{
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if (usr_msg->len == 0 && (usr_msg->flags & I2C_M_RD)) {
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dev_err(pd->dev, "Unsupported zero length i2c read\n");
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return -EOPNOTSUPP;
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}
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if (do_init) {
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/* Initialize channel registers */
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iic_wr(pd, ICCR, ICCR_SCP);
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@ -758,6 +753,10 @@ static const struct i2c_algorithm sh_mobile_i2c_algorithm = {
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.master_xfer = sh_mobile_i2c_xfer,
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};
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static const struct i2c_adapter_quirks sh_mobile_i2c_quirks = {
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.flags = I2C_AQ_NO_ZERO_LEN_READ,
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};
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/*
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* r8a7740 chip has lasting errata on I2C I/O pad reset.
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* this is work-around for it.
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@ -925,6 +924,7 @@ static int sh_mobile_i2c_probe(struct platform_device *dev)
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adap->owner = THIS_MODULE;
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adap->algo = &sh_mobile_i2c_algorithm;
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adap->quirks = &sh_mobile_i2c_quirks;
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adap->dev.parent = &dev->dev;
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adap->retries = 5;
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adap->nr = dev->id;
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