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SubjectRe: [PATCH 2/2] opp: Manage empty OPP tables with clk handle
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On 7/3/2019 3:17 PM, Viresh Kumar wrote:
> On 03-07-19, 14:41, Rajendra Nayak wrote:
>> []..
>>>
>>> Explain the rationale behind this code here in a comment.
>>>
>>>> + if (!_get_opp_count(opp_table)) {
>>>> + ret = _generic_set_opp_clk_only(dev, clk, freq);
>>>> + goto put_opp_table;
>>>> + }
>>>> +
>>>> temp_freq = old_freq;
>>>> old_opp = _find_freq_ceil(opp_table, &temp_freq);
>>>> if (IS_ERR(old_opp)) {
>>>
>>> Also, rebase over the OPP branch please:
>>
>> thanks, I will fix/rebase and repost,
>> in the meantime while I was testing this a little more I realized I also need
>> something like the change below to avoid a refcount mismatch WARN when empty OPP
>> table is removed using dev_pm_opp_of_remove_table()
>>
>> diff --git a/drivers/opp/core.c b/drivers/opp/core.c
>> index fa7d4d6d37b3..20128a88baf2 100644
>> --- a/drivers/opp/core.c
>> +++ b/drivers/opp/core.c
>> @@ -2118,7 +2118,8 @@ void _dev_pm_opp_find_and_remove_table(struct device *dev)
>> return;
>> }
>> - _put_opp_list_kref(opp_table);
>> + if (_get_opp_count(opp_table))
>> + _put_opp_list_kref(opp_table);
>> /* Drop reference taken by _find_opp_table() */
>> dev_pm_opp_put_opp_table(opp_table);
>>
>> Does this look like a good way to fix it?
>
> No. If an OPP table only has dynamic OPPs, this will still generate
> warning. Below is the fix I would suggest. Please test it, I haven't
> tested it at all :)

thanks, yes, this seems to work.

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