On 17 July 2018 at 22:08, Anand Moon <linux.amoon@xxxxxxxxx> wrote:
> Hi Krzysztof,
>
> On 17 July 2018 at 17:54, Krzysztof Kozlowski <krzk@xxxxxxxxxx> wrote:
>> On 17 July 2018 at 12:12, Anand Moon <linux.amoon@xxxxxxxxx> wrote:
>>> cleanup err check in exynos_tmu_work as clk internal
>>> framework will perform if clk is enable/disable
>>> so drop the double check of IS_ERR and other such references.
>>
>> I do not understand the statement. Clock framework will perform if clk
>> is enable/disable? How clock can be "enable" or "disable"? You mean
>> gate clock? you mean clock pointer is an ERR pointer?
>>
>
> if (!IS_ERR(data->clk_sec))
> check if the pointer is valid or not
> this check is again performed in
> clk_enable.
This should be then written in commit msg.
>>> CC: Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx>
>>> Signed-off-by: Anand Moon <linux.amoon@xxxxxxxxx>
>>> ---
>>> drivers/thermal/samsung/exynos_tmu.c | 19 ++++++-------------
>>> 1 file changed, 6 insertions(+), 13 deletions(-)
>>>
>>> diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
>>> index 0164c9e..2dbde97 100644
>>> --- a/drivers/thermal/samsung/exynos_tmu.c
>>> +++ b/drivers/thermal/samsung/exynos_tmu.c
>>> @@ -300,8 +300,7 @@ static int exynos_tmu_initialize(struct platform_device *pdev)
>>>
>>> mutex_lock(&data->lock);
>>> clk_enable(data->clk);
>>> - if (!IS_ERR(data->clk_sec))
>>> - clk_enable(data->clk_sec);
>>> + clk_enable(data->clk_sec);
>>>
>>> status = readb(data->base + EXYNOS_TMU_REG_STATUS);
>>> if (!status) {
>>> @@ -334,8 +333,7 @@ static int exynos_tmu_initialize(struct platform_device *pdev)
>>> err:
>>> clk_disable(data->clk);
>>> mutex_unlock(&data->lock);
>>> - if (!IS_ERR(data->clk_sec))
>>> - clk_disable(data->clk_sec);
>>> + clk_disable(data->clk_sec);
>>> out:
>>> return ret;
>>> }
>>> @@ -789,19 +787,16 @@ static void exynos_tmu_work(struct work_struct *work)
>>> struct exynos_tmu_data *data = container_of(work,
>>> struct exynos_tmu_data, irq_work);
>>>
>>> - if (!IS_ERR(data->clk_sec))
>>> - clk_enable(data->clk_sec);
>>> - if (!IS_ERR(data->clk_sec))
>>> - clk_disable(data->clk_sec);
>>> -
>>> thermal_zone_device_update(data->tzd, THERMAL_EVENT_UNSPECIFIED);
>>>
>>> mutex_lock(&data->lock);
>>> clk_enable(data->clk);
>>> + clk_enable(data->clk_sec);
>>
>> You are changing here the logic completely. Before the "enable" was
>> followed immediately by "disable". Now you are moving disable
>> somewhere else... All this looks suspicious...
>
> I chose to move enable/disable of clk_sec this under the mutex lock for safe
> which dose the same sequence with different order.
>
> Second approach:
> We should get rid of clk_enable/disable in exynos_tmu_work
> as this looks unnecessary for toggle clk's on every update.
I already sent a cleanup for this:
https://patchwork.kernel.org/patch/10529971/
Best regards,
Krzysztof
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