linux-kernel - Re: [PATCH v7 3/4] drm/panfrost: devfreq: Disable devfreq when num

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Date:   Thu, 7 Jan 2021 09:51:38 +0100
From:   Tomeu Vizoso <tomeu.vizoso@...labora.com>
To:     Nicolas Boichat <drinkcat@...omium.org>
Cc:     Rob Herring <robh@...nel.org>, Steven Price <steven.price@....com>,
        Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>,
        Kristian Kristensen <hoegsberg@...omium.org>,
        Fei Shao <fshao@...omium.org>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Boris Brezillon <boris.brezillon@...labora.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7 3/4] drm/panfrost: devfreq: Disable devfreq when
 num_supplies > 1

On 1/7/21 9:49 AM, Nicolas Boichat wrote:
> On Thu, Jan 7, 2021 at 4:31 PM Tomeu Vizoso <tomeu.vizoso@...labora.com> wrote:
>>
>> On 1/7/21 9:26 AM, Nicolas Boichat wrote:
>>> GPUs with more than a single regulator (e.g. G72 on MT8183) will
>>> require platform-specific handling, disable devfreq for now.
>>>
>>> Signed-off-by: Nicolas Boichat <drinkcat@...omium.org>
>>> ---
>>>
>>> Changes in v7:
>>>    - Fix GPU ID in commit message
>>>
>>> Changes in v6:
>>>    - New change
>>>
>>>    drivers/gpu/drm/panfrost/panfrost_devfreq.c | 9 +++++++++
>>>    1 file changed, 9 insertions(+)
>>>
>>> diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
>>> index f44d28fad085..1f49043aae73 100644
>>> --- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
>>> +++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
>>> @@ -92,6 +92,15 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
>>>        struct thermal_cooling_device *cooling;
>>>        struct panfrost_devfreq *pfdevfreq = &pfdev->pfdevfreq;
>>>
>>> +     if (pfdev->comp->num_supplies > 1) {
>>> +             /*
>>> +              * GPUs with more than 1 supply require platform-specific handling:
>>> +              * continue without devfreq
>>> +              */
>>> +             DRM_DEV_ERROR(dev, "More than 1 supply is not supported yet\n");
>>
>> Should this be info instead?
> 
> Sure, will fix in v8.

Thanks. With that change, patches 3 and 4 are R-b.

Thanks again!

Tomeu

>>
>> Regards,
>>
>> Tomeu
>>
>>> +             return 0;
>>> +     }
>>> +
>>>        opp_table = dev_pm_opp_set_regulators(dev, pfdev->comp->supply_names,
>>>                                              pfdev->comp->num_supplies);
>>>        if (IS_ERR(opp_table)) {
>>>