Hi Austin,
On 4/25/2018 8:37 PM, Christ, Austin wrote:
> Hey Sricharan,
>
> On 4/25/2018 4:57 AM, Sricharan R wrote:
>>
>>
>> On 4/25/2018 2:51 AM, Austin Christ wrote:
>>> Add a module parameter to override SCL frequency provided by firmware.
>>> This can be useful when testing spec compliance for I2C modes or when
>>> debugging issues across multiple operating frequencies.
>>>
>>> Signed-off-by: Austin Christ <austinwc@xxxxxxxxxxxxxx>
>>> ---
>>> drivers/i2c/busses/i2c-qup.c | 19 ++++++++++++++-----
>>> 1 file changed, 14 insertions(+), 5 deletions(-)
>>>
>>> diff --git a/drivers/i2c/busses/i2c-qup.c b/drivers/i2c/busses/i2c-qup.c
>>> index f87f29f..da4cc57 100644
>>> --- a/drivers/i2c/busses/i2c-qup.c
>>> +++ b/drivers/i2c/busses/i2c-qup.c
>>> @@ -155,6 +155,10 @@
>>> /* TAG length for DATA READ in RX FIFO */
>>> #define READ_RX_TAGS_LEN 2
>>> +static unsigned int scl_freq;
>>> +module_param_named(scl_freq, scl_freq, uint, 0444);
>>
>> Instead of hard coding the permission constants, macro can be used.
>>
>> Otherwise,
>>
>> Reviewed-by: Sricharan R <sricharan@xxxxxxxxxxxxxx>
>>
>> Regards,
>> Sricharan
>>
>
> Ok I'll switch it. I originally switched to 0444 based on a recommendation from checkpatch.
>>
hmm, guess i was wrong there. sorry. Better to stick to octal then as you already have.
Regards,
Sricharan
>>> +MODULE_PARM_DESC(scl_freq, "SCL frequency override");
>>> +
>>> /*
>>> * count: no of blocks
>>> * pos: current block number
>>> @@ -1682,11 +1686,16 @@ static int qup_i2c_probe(struct platform_device *pdev)
>>> init_completion(&qup->xfer);
>>> platform_set_drvdata(pdev, qup);
>>> - ret = device_property_read_u32(qup->dev, "clock-frequency", &clk_freq);
>>> - if (ret) {
>>> - dev_notice(qup->dev, "using default clock-frequency %d",
>>> - DEFAULT_CLK_FREQ);
>>> - }
>>> + if (scl_freq) {
>>> + dev_notice(qup->dev, "Using override frequency of %u\n", scl_freq);
>>> + clk_freq = scl_freq;
>>> + } else {
>>> + ret = device_property_read_u32(qup->dev, "clock-frequency", &clk_freq);
>>> + if (ret) {
>>> + dev_notice(qup->dev, "using default clock-frequency %d",
>>> + DEFAULT_CLK_FREQ);
>>> + }
>>> + }
>>> if (of_device_is_compatible(pdev->dev.of_node, "qcom,i2c-qup-v1.1.1")) {
>>> qup->adap.algo = &qup_i2c_algo;
>>>
>>
>
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