On 05/03/18 14:51, Hans Verkuil wrote:
> From: Hans Verkuil <hans.verkuil@xxxxxxxxx>
>
> Implement all the error injection commands.
>
> The state machine gets new states for the various error situations,
> helper functions are added to detect whether an error injection is
> active and the actual error injections are implemented.
>
> Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
> ---
> drivers/media/cec/cec-pin-priv.h | 38 ++-
> drivers/media/cec/cec-pin.c | 542 +++++++++++++++++++++++++++++++++++----
> 2 files changed, 521 insertions(+), 59 deletions(-)
>
> diff --git a/drivers/media/cec/cec-pin-priv.h b/drivers/media/cec/cec-pin-priv.h
> index 779384f18689..c9349f68e554 100644
> --- a/drivers/media/cec/cec-pin-priv.h
> +++ b/drivers/media/cec/cec-pin-priv.h
<snip>
> +static bool tx_error_inj(struct cec_pin *pin, unsigned int mode_offset,
> + int arg_idx, u8 *arg)
> +{
> +#ifdef CONFIG_CEC_PIN_ERROR_INJ
> + u16 cmd = cec_pin_tx_error_inj(pin);
> + u64 e = pin->error_inj[cmd];
> + unsigned int mode = (e >> mode_offset) & CEC_ERROR_INJ_MODE_MASK;
> +
> + if (arg_idx) {
Oops, this should be arg_idx >= 0. It's -1 if there is no argument associated
with the error injection command.
> + u8 pos = pin->error_inj_args[cmd][arg_idx];
> +
> + if (arg)
> + *arg = pos;
> + else if (pos != pin->tx_bit)
> + return false;
> + }
> +
> + switch (mode) {
> + case CEC_ERROR_INJ_MODE_ONCE:
> + pin->error_inj[cmd] &= ~(CEC_ERROR_INJ_MODE_MASK << mode_offset);
> + return true;
> + case CEC_ERROR_INJ_MODE_ALWAYS:
> + return true;
> + case CEC_ERROR_INJ_MODE_TOGGLE:
> + return pin->tx_toggle;
> + default:
> + return false;
> + }
> +#else
> + return false;
> +#endif
> +}
<snip>
> + case EOM_BIT:
> + v = pin->tx_bit / 10 ==
> + pin->tx_msg.len + pin->tx_extra_bytes - 1;
> + if (pin->tx_msg.len > 1 && tx_early_eom(pin)) {
tx_early_eom should only be called for the second-to-last byte.
> + /* Error injection: set EOM one byte early */
> + v = pin->tx_bit / 10 ==
> + pin->tx_msg.len + pin->tx_extra_bytes - 2;
> + pin->tx_post_eom = true;
> + }
> + if (tx_no_eom(pin)) {
Ditto for tx_no_eom: only call for the last byte.
Otherwise for mode 'once' this error injection command will be cleared
before the end of the message is reached.
> + /* Error injection: no EOM */
> + v = false;
> + }
> pin->state = v ? CEC_ST_TX_DATA_BIT_1_LOW :
> - CEC_ST_TX_DATA_BIT_0_LOW;
> + CEC_ST_TX_DATA_BIT_0_LOW;
> break;
Regards,
Hans
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