Re: [PATCH v3 2/3] i3c: master: dw: Map CCC hardware errors to I3C M0/M2

["NG, TZE YEE" <tze.yee.ng@altera.com>]

On 20/6/2026 3:26 am, Frank Li wrote:
> On Wed, Jun 10, 2026 at 06:54:07PM -0700, tze.yee.ng@altera.com wrote:
>> From: Adrian Ng Ho Yin <adrian.ho.yin.ng@altera.com>
>>
>> Map DesignWare response-queue status to standard I3C error codes in
>> ccc->err:
>>
>> - RESPONSE_ERROR_IBA_NACK and RESPONSE_ERROR_ADDRESS_NACK -> I3C_ERROR_M2
>> - RESPONSE_ERROR_CRC, RESPONSE_ERROR_PARITY, RESPONSE_ERROR_FRAME and
>>    RESPONSE_ERROR_TRANSF_ABORT -> I3C_ERROR_M0
>>
>> Return -EIO for RESPONSE_ERROR_ADDRESS_NACK so bus NACKs are not reported
>> as -EINVAL alongside I3C_ERROR_M2, consistent with IBA_NACK handling and
>> other I3C master drivers.
>>
>> The M0 mappings match the generic I/O failures already reported by
>> dw_i3c_master_end_xfer_locked() so the core can retry transient bus
>> integrity errors on CCC transfers.
>>
>> Reset ccc->err to I3C_ERROR_UNKNOWN before each transfer.
>>
>> Signed-off-by: Adrian Ng Ho Yin <adrian.ho.yin.ng@altera.com>
>> Signed-off-by: Tze Yee Ng <tze.yee.ng@altera.com>
>> ---
>>   drivers/i3c/master/dw-i3c-master.c | 31 +++++++++++++++++++++++++-----
>>   1 file changed, 26 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/i3c/master/dw-i3c-master.c b/drivers/i3c/master/dw-i3c-master.c
>> index 06fdf8857b9c..45bde92d0342 100644
>> --- a/drivers/i3c/master/dw-i3c-master.c
>> +++ b/drivers/i3c/master/dw-i3c-master.c
>> @@ -493,6 +493,7 @@ static void dw_i3c_master_end_xfer_locked(struct dw_i3c_master *master, u32 isr)
>>   			break;
>>   		case RESPONSE_ERROR_PARITY:
>>   		case RESPONSE_ERROR_IBA_NACK:
>> +		case RESPONSE_ERROR_ADDRESS_NACK:
>>   		case RESPONSE_ERROR_TRANSF_ABORT:
>>   		case RESPONSE_ERROR_CRC:
>>   		case RESPONSE_ERROR_FRAME:
>> @@ -502,7 +503,6 @@ static void dw_i3c_master_end_xfer_locked(struct dw_i3c_master *master, u32 isr)
>>   			ret = -ENOSPC;
>>   			break;
>>   		case RESPONSE_ERROR_I2C_W_NACK_ERR:
>> -		case RESPONSE_ERROR_ADDRESS_NACK:
>>   		default:
>>   			ret = -EINVAL;
>>   			break;
>> @@ -708,12 +708,32 @@ static void dw_i3c_master_bus_cleanup(struct i3c_master_controller *m)
>>   	dw_i3c_master_disable(master);
>>   }
>>
>> +static void dw_i3c_ccc_map_err(struct i3c_ccc_cmd *ccc, struct dw_i3c_cmd *cmd)
>> +{
>> +	switch (cmd->error) {
>> +	case RESPONSE_ERROR_IBA_NACK:
>> +	case RESPONSE_ERROR_ADDRESS_NACK:
>> +		ccc->err = I3C_ERROR_M2;
>> +		break;
>> +	case RESPONSE_ERROR_CRC:
>> +	case RESPONSE_ERROR_PARITY:
>> +	case RESPONSE_ERROR_FRAME:
>> +	case RESPONSE_ERROR_TRANSF_ABORT:
>> +		ccc->err = I3C_ERROR_M0;
>> +		break;
>> +	default:
>> +		break;
>> +	}
>> +}
>> +
> 
> generaly this type map function like
> 
> enum i3c_error_code dw_i3c_ccc_map_err(int dw_err)
> {
> 	....
> }
> 
> ccc->err = dw_i3c_ccc_map_err(cmd->error);
> 
> Frank
Agree, in v4, we will change it to return enum i3c_error_code from the 
DW error code.>>   static int dw_i3c_ccc_set(struct dw_i3c_master *master,
>>   			  struct i3c_ccc_cmd *ccc)
>>   {
>>   	struct dw_i3c_cmd *cmd;
>>   	int ret, pos = 0;
>>
>> +	ccc->err = I3C_ERROR_UNKNOWN;
>> +
>>   	if (ccc->id & I3C_CCC_DIRECT) {
>>   		pos = dw_i3c_master_get_addr_pos(master, ccc->dests[0].addr);
>>   		if (pos < 0)
>> @@ -742,8 +762,8 @@ static int dw_i3c_ccc_set(struct dw_i3c_master *master,
>>   		dw_i3c_master_dequeue_xfer(master, xfer);
>>
>>   	ret = xfer->ret;
>> -	if (xfer->cmds[0].error == RESPONSE_ERROR_IBA_NACK)
>> -		ccc->err = I3C_ERROR_M2;
>> +	cmd = &xfer->cmds[0];
>> +	dw_i3c_ccc_map_err(ccc, cmd);
>>
>>   	return ret;
>>   }
>> @@ -754,6 +774,8 @@ static int dw_i3c_ccc_get(struct dw_i3c_master *master, struct i3c_ccc_cmd *ccc)
>>   	u16 req_len;
>>   	int ret, pos;
>>
>> +	ccc->err = I3C_ERROR_UNKNOWN;
>> +
>>   	pos = dw_i3c_master_get_addr_pos(master, ccc->dests[0].addr);
>>   	if (pos < 0)
>>   		return pos;
>> @@ -784,10 +806,9 @@ static int dw_i3c_ccc_get(struct dw_i3c_master *master, struct i3c_ccc_cmd *ccc)
>>
>>   	ret = xfer->ret;
>>   	cmd = &xfer->cmds[0];
>> +	dw_i3c_ccc_map_err(ccc, cmd);
>>   	if (!ret)
>>   		ccc->dests[0].payload.len = cmd->rx_len;
>> -	if (cmd->error == RESPONSE_ERROR_IBA_NACK)
>> -		ccc->err = I3C_ERROR_M2;
>>
>>   	return ret;
>>   }
>> --
>> 2.43.7
>>