On Wed, Feb 25, 2015 at 05:01:54PM +0100, Wolfram Sang wrote: > From: Wolfram Sang <wsa+rene...@sang-engineering.com> > > Signed-off-by: Wolfram Sang <wsa+rene...@sang-engineering.com>
Hi Ludovic,
if you have a few minutes, could you please test this series? I'd like to
include it in 4.1. and because at91 is using the quirk infrastructure in
a more complex way, it is a really good test candidate.
Thanks,
Wolfram
> ---
> drivers/i2c/busses/i2c-at91.c | 32 +++++++++++---------------------
> 1 file changed, 11 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c
> index 636fd2efad8850..b3a70e8fc653c5 100644
> --- a/drivers/i2c/busses/i2c-at91.c
> +++ b/drivers/i2c/busses/i2c-at91.c
> @@ -487,30 +487,10 @@ static int at91_twi_xfer(struct i2c_adapter *adap,
> struct i2c_msg *msg, int num)
> if (ret < 0)
> goto out;
>
> - /*
> - * The hardware can handle at most two messages concatenated by a
> - * repeated start via it's internal address feature.
> - */
> - if (num > 2) {
> - dev_err(dev->dev,
> - "cannot handle more than two concatenated messages.\n");
> - ret = 0;
> - goto out;
> - } else if (num == 2) {
> + if (num == 2) {
> int internal_address = 0;
> int i;
>
> - if (msg->flags & I2C_M_RD) {
> - dev_err(dev->dev, "first transfer must be write.\n");
> - ret = -EINVAL;
> - goto out;
> - }
> - if (msg->len > 3) {
> - dev_err(dev->dev, "first message size must be <= 3.\n");
> - ret = -EINVAL;
> - goto out;
> - }
> -
> /* 1st msg is put into the internal address, start with 2nd */
> m_start = &msg[1];
> for (i = 0; i < msg->len; ++i) {
> @@ -540,6 +520,15 @@ out:
> return ret;
> }
>
> +/*
> + * The hardware can handle at most two messages concatenated by a
> + * repeated start via it's internal address feature.
> + */
> +static struct i2c_adapter_quirks at91_twi_quirks = {
> + .flags = I2C_AQ_COMB | I2C_AQ_COMB_WRITE_FIRST | I2C_AQ_COMB_SAME_ADDR,
> + .max_comb_1st_msg_len = 3,
> +};
> +
> static u32 at91_twi_func(struct i2c_adapter *adapter)
> {
> return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL
> @@ -777,6 +766,7 @@ static int at91_twi_probe(struct platform_device *pdev)
> dev->adapter.owner = THIS_MODULE;
> dev->adapter.class = I2C_CLASS_DEPRECATED;
> dev->adapter.algo = &at91_twi_algorithm;
> + dev->adapter.quirks = &at91_twi_quirks;
> dev->adapter.dev.parent = dev->dev;
> dev->adapter.nr = pdev->id;
> dev->adapter.timeout = AT91_I2C_TIMEOUT;
> --
> 2.1.4
>
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