Hi Austin,
On 4/12/2018 8:57 PM, Christ, Austin wrote:
> Hey Sricharan,
>
> On 4/11/2018 10:28 PM, Sricharan R wrote:
>> Hi Austin,
>>
>> On 4/5/2018 1:14 AM, Austin Christ wrote:
>>> Add support for Qualcomm Centriq devices that are qup-v2 compatible but
>>> do not support DMA, so nodma needs to be set.
>>>
>>> Signed-off-by: Austin Christ <austinwc@xxxxxxxxxxxxxx>
>>> ---
>>> v1:
>>> - Initial
>>> v2:
>>> - Remove whitespace error
>>> ---
>>> drivers/i2c/busses/i2c-qup.c | 22 ++++++++++++++--------
>>> 1 file changed, 14 insertions(+), 8 deletions(-)
>>>
>>> diff --git a/drivers/i2c/busses/i2c-qup.c b/drivers/i2c/busses/i2c-qup.c
>>> index 904dfec..80af973 100644
>>> --- a/drivers/i2c/busses/i2c-qup.c
>>> +++ b/drivers/i2c/busses/i2c-qup.c
>>> @@ -1648,6 +1648,14 @@ static void qup_i2c_disable_clocks(struct qup_i2c_dev *qup)
>>> clk_disable_unprepare(qup->pclk);
>>> }
>>> +#if IS_ENABLED(CONFIG_ACPI)
>>> +static const struct acpi_device_id qup_i2c_acpi_match[] = {
>>> + { "QCOM8010"},
>>> + { },
>>> +};
>>> +MODULE_DEVICE_TABLE(acpi, qup_i2c_acpi_match);
>>> +#endif
>>> +
>>> static int qup_i2c_probe(struct platform_device *pdev)
>>> {
>>> static const int blk_sizes[] = {4, 16, 32};
>>> @@ -1675,6 +1683,12 @@ static int qup_i2c_probe(struct platform_device *pdev)
>>> DEFAULT_CLK_FREQ);
>>> }
>>> + if (acpi_match_device(qup_i2c_acpi_match, qup->dev)) {
>>> + qup->adap.algo = &qup_i2c_algo_v2;
>>> + is_qup_v1 = false;
>>> + goto nodma;
>>> + }
>>> +
>>
>> What happens without the above check. Does it not get resolved below,
>> when qup_i2c_req_dma fails ?
>>
>> Regards,
>> Sricharan
>>
>
> Yes currently qup_i2c_req_dma fails and then the nodma: path is chosen. However, this causes unexpected logging of "tx channel not available" for the Centriq platform. This seemed a more correct solution to those incorrect logging statements than lowering the dev_err to dev_info or dev_notify.
hmm, then just push this if (acpi_match_device(qup_i2c_acpi_match, qup->dev) down.
if (of_device_is_compatible(pdev->dev.of_node, "qcom,i2c-qup-v1.1.1")) {
....
} else {
qup->adap.algo = &qup_i2c_algo_v2;
is_qup_v1 = false;
if (acpi_match_device(qup_i2c_acpi_match, qup->dev))
goto nodma;
else
ret = qup_i2c_req_dma(qup);
Regards,
Sricharan
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