On 2/25/2015 8:02 AM, Wolfram Sang wrote:
> From: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
>
> Signed-off-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
> ---
> drivers/i2c/busses/i2c-bcm-iproc.c | 15 +++++++--------
> 1 file changed, 7 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
> index d3c89157b33774..f9f2c2082151e2 100644
> --- a/drivers/i2c/busses/i2c-bcm-iproc.c
> +++ b/drivers/i2c/busses/i2c-bcm-iproc.c
> @@ -160,14 +160,6 @@ static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *iproc_i2c,
> u32 val;
> unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
>
> - /* need to reserve one byte in the FIFO for the slave address */
> - if (msg->len > M_TX_RX_FIFO_SIZE - 1) {
> - dev_err(iproc_i2c->device,
> - "only support data length up to %u bytes\n",
> - M_TX_RX_FIFO_SIZE - 1);
> - return -EOPNOTSUPP;
> - }
> -
> /* check if bus is busy */
> if (!!(readl(iproc_i2c->base + M_CMD_OFFSET) &
> BIT(M_CMD_START_BUSY_SHIFT))) {
> @@ -287,6 +279,12 @@ static const struct i2c_algorithm bcm_iproc_algo = {
> .functionality = bcm_iproc_i2c_functionality,
> };
>
> +static struct i2c_adapter_quirks bcm_iproc_i2c_quirks = {
> + /* need to reserve one byte in the FIFO for the slave address */
> + .max_read_len = M_TX_RX_FIFO_SIZE - 1,
> + .max_write_len = M_TX_RX_FIFO_SIZE - 1,
> +};
> +
> static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *iproc_i2c)
> {
> unsigned int bus_speed;
> @@ -413,6 +411,7 @@ static int bcm_iproc_i2c_probe(struct platform_device *pdev)
> i2c_set_adapdata(adap, iproc_i2c);
> strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
> adap->algo = &bcm_iproc_algo;
> + adap->quirks = &bcm_iproc_i2c_quirks;
> adap->dev.parent = &pdev->dev;
> adap->dev.of_node = pdev->dev.of_node;
>
>
Change on the iproc i2c driver looks good to me. Sanity tested the
change from Wolfram's i2c/quirks branch on Cygnus 958300K combo board.
Sanity tested with an attempt to transfer large amount of I2C data to
ensure the transfer is denied by the i2c-core:
/ # cat /dev/i2c-0
[ 657.310261] i2c i2c-0: quirk: msg too long (addr 0x0000, size 4096, read)
Reviewed-by: Ray Jui <rjui@xxxxxxxxxxxx>
Tested-by: Ray Jui <rjui@xxxxxxxxxxxx>
Thanks,
Ray
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