From: Wolfram Sang Date: Mon, 23 Jul 2018 20:26:16 +0000 (+0200) Subject: i2c: sh_mobile: use core to detect 'no zero length read' quirk X-Git-Tag: v4.19~339^2~14 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=7957c2e276ee73e6c6cb1ab69e2372bd095c097a;p=platform%2Fkernel%2Flinux-rpi3.git i2c: sh_mobile: use core to detect 'no zero length read' quirk And don't reimplement in the driver. Signed-off-by: Wolfram Sang Reviewed-by: Niklas Söderlund Signed-off-by: Wolfram Sang --- diff --git a/drivers/i2c/busses/i2c-sh_mobile.c b/drivers/i2c/busses/i2c-sh_mobile.c index 5fda418..9c7f6f8 100644 --- a/drivers/i2c/busses/i2c-sh_mobile.c +++ b/drivers/i2c/busses/i2c-sh_mobile.c @@ -613,11 +613,6 @@ static void sh_mobile_i2c_xfer_dma(struct sh_mobile_i2c_data *pd) static int start_ch(struct sh_mobile_i2c_data *pd, struct i2c_msg *usr_msg, bool do_init) { - if (usr_msg->len == 0 && (usr_msg->flags & I2C_M_RD)) { - dev_err(pd->dev, "Unsupported zero length i2c read\n"); - return -EOPNOTSUPP; - } - if (do_init) { /* Initialize channel registers */ iic_wr(pd, ICCR, ICCR_SCP); @@ -758,6 +753,10 @@ static const struct i2c_algorithm sh_mobile_i2c_algorithm = { .master_xfer = sh_mobile_i2c_xfer, }; +static const struct i2c_adapter_quirks sh_mobile_i2c_quirks = { + .flags = I2C_AQ_NO_ZERO_LEN_READ, +}; + /* * r8a7740 chip has lasting errata on I2C I/O pad reset. * this is work-around for it. @@ -925,6 +924,7 @@ static int sh_mobile_i2c_probe(struct platform_device *dev) adap->owner = THIS_MODULE; adap->algo = &sh_mobile_i2c_algorithm; + adap->quirks = &sh_mobile_i2c_quirks; adap->dev.parent = &dev->dev; adap->retries = 5; adap->nr = dev->id;