Re: [PATCH 08/15] drm/panfrost: move devfreq_init()/fini() in device

From: Tomeu Vizoso <tomeu.vizoso@collabora.com>
To: "Clément Péron" <peron.clem@gmail.com>,
	"Steven Price" <steven.price@arm.com>
Cc: Rob Herring <robh@kernel.org>,
	Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>,
	Viresh Kumar <vireshk@kernel.org>, Nishanth Menon <nm@ti.com>,
	Stephen Boyd <sboyd@kernel.org>,
	Maxime Ripard <mripard@kernel.org>, Chen-Yu Tsai <wens@csie.org>,
	dri-devel <dri-devel@lists.freedesktop.org>,
	linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 08/15] drm/panfrost: move devfreq_init()/fini() in device
Date: Mon, 8 Jun 2020 13:55:32 +0200	[thread overview]
Message-ID: <8cdb1fdc-fc40-7880-8fd1-bed2bfdb16a6@collabora.com> (raw)
In-Reply-To: <CAJiuCceH-wOHc7wEEtmd+CC==QgqK1nOG6YB389Gs=+0t8i=wg@mail.gmail.com>

On 5/29/20 2:38 PM, Clément Péron wrote:
> Hi Steven
> 
> On Thu, 28 May 2020 at 15:22, Steven Price <steven.price@arm.com> wrote:
>>
>> On 10/05/2020 17:55, Clément Péron wrote:
>>> Later we will introduce devfreq probing regulator if they
>>> are present. As regulator should be probe only one time we
>>> need to get this logic in the device_init().
>>>
>>> panfrost_device is already taking care of devfreq_resume()
>>> and devfreq_suspend(), so it's not totally illogic to move
>>> the devfreq_init() and devfreq_fini() here.
>>>
>>> Signed-off-by: Clément Péron <peron.clem@gmail.com>
>>> ---
>>>    drivers/gpu/drm/panfrost/panfrost_device.c | 37 ++++++++++++++--------
>>>    drivers/gpu/drm/panfrost/panfrost_drv.c    | 15 ++-------
>>>    2 files changed, 25 insertions(+), 27 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/panfrost/panfrost_device.c b/drivers/gpu/drm/panfrost/panfrost_device.c
>>> index 8136babd3ba9..f480127205d6 100644
>>> --- a/drivers/gpu/drm/panfrost/panfrost_device.c
>>> +++ b/drivers/gpu/drm/panfrost/panfrost_device.c
>>> @@ -212,59 +212,67 @@ int panfrost_device_init(struct panfrost_device *pfdev)
>>>                return err;
>>>        }
>>>
>>> +     err = panfrost_devfreq_init(pfdev);
>>> +     if (err) {
>>> +             dev_err(pfdev->dev, "devfreq init failed %d\n", err);
>>> +             goto err_out0;
>>> +     }
>>> +
>>>        err = panfrost_regulator_init(pfdev);
>>>        if (err) {
>>>                dev_err(pfdev->dev, "regulator init failed %d\n", err);
>>> -             goto err_out0;
>>> +             goto err_out1;
>>
>> NIT: Rather than just renumbering these can we give them sensible names
>> so we don't have this sort of refactoring in future?
> 
> Agree, I will change that in v2

FWIW, there's a sensible approach described in 
Documentation/process/coding-style.rst ("7) Centralized exiting of 
functions").

Regards,

Tomeu

> 
>>
>>>        }
>>>
>>>        err = panfrost_reset_init(pfdev);
>>>        if (err) {
>>>                dev_err(pfdev->dev, "reset init failed %d\n", err);
>>> -             goto err_out1;
>>> +             goto err_out2;
>>>        }
>>>
>>>        err = panfrost_pm_domain_init(pfdev);
>>>        if (err)
>>> -             goto err_out2;
>>> +             goto err_out3;
>>>
>>>        res = platform_get_resource(pfdev->pdev, IORESOURCE_MEM, 0);
>>>        pfdev->iomem = devm_ioremap_resource(pfdev->dev, res);
>>>        if (IS_ERR(pfdev->iomem)) {
>>>                dev_err(pfdev->dev, "failed to ioremap iomem\n");
>>>                err = PTR_ERR(pfdev->iomem);
>>> -             goto err_out3;
>>> +             goto err_out4;
>>>        }
>>>
>>>        err = panfrost_gpu_init(pfdev);
>>>        if (err)
>>> -             goto err_out3;
>>> +             goto err_out4;
>>>
>>>        err = panfrost_mmu_init(pfdev);
>>>        if (err)
>>> -             goto err_out4;
>>> +             goto err_out5;
>>>
>>>        err = panfrost_job_init(pfdev);
>>>        if (err)
>>> -             goto err_out5;
>>> +             goto err_out6;
>>>
>>>        err = panfrost_perfcnt_init(pfdev);
>>>        if (err)
>>> -             goto err_out6;
>>> +             goto err_out7;
>>>
>>>        return 0;
>>> -err_out6:
>>> +err_out7:
>>>        panfrost_job_fini(pfdev);
>>> -err_out5:
>>> +err_out6:
>>>        panfrost_mmu_fini(pfdev);
>>> -err_out4:
>>> +err_out5:
>>>        panfrost_gpu_fini(pfdev);
>>> -err_out3:
>>> +err_out4:
>>>        panfrost_pm_domain_fini(pfdev);
>>> -err_out2:
>>> +err_out3:
>>>        panfrost_reset_fini(pfdev);
>>> -err_out1:
>>> +err_out2:
>>>        panfrost_regulator_fini(pfdev);
>>> +err_out1:
>>> +     panfrost_devfreq_fini(pfdev);
>>>    err_out0:
>>>        panfrost_clk_fini(pfdev);
>>>        return err;
>>> @@ -278,6 +286,7 @@ void panfrost_device_fini(struct panfrost_device *pfdev)
>>>        panfrost_gpu_fini(pfdev);
>>>        panfrost_pm_domain_fini(pfdev);
>>>        panfrost_reset_fini(pfdev);
>>> +     panfrost_devfreq_fini(pfdev);
>>>        panfrost_regulator_fini(pfdev);
>>>        panfrost_clk_fini(pfdev);
>>>    }
>>> diff --git a/drivers/gpu/drm/panfrost/panfrost_drv.c b/drivers/gpu/drm/panfrost/panfrost_drv.c
>>> index 882fecc33fdb..4dda68689015 100644
>>> --- a/drivers/gpu/drm/panfrost/panfrost_drv.c
>>> +++ b/drivers/gpu/drm/panfrost/panfrost_drv.c
>>> @@ -14,7 +14,6 @@
>>>    #include <drm/drm_utils.h>
>>>
>>>    #include "panfrost_device.h"
>>> -#include "panfrost_devfreq.h"
>>>    #include "panfrost_gem.h"
>>>    #include "panfrost_mmu.h"
>>>    #include "panfrost_job.h"
>>> @@ -606,13 +605,6 @@ static int panfrost_probe(struct platform_device *pdev)
>>>                goto err_out0;
>>>        }
>>>
>>> -     err = panfrost_devfreq_init(pfdev);
>>> -     if (err) {
>>> -             if (err != -EPROBE_DEFER)
>>> -                     dev_err(&pdev->dev, "Fatal error during devfreq init\n");
>>
>> You seem to have lost the check for EPROBE_DEFER during the move.
> 
> Correct, sorry for that, I will fix it in v2.
> 
> Thanks for your review,
> Clement
> 
>>
>>> -             goto err_out1;
>>> -     }
>>> -
>>>        pm_runtime_set_active(pfdev->dev);
>>>        pm_runtime_mark_last_busy(pfdev->dev);
>>>        pm_runtime_enable(pfdev->dev);
>>> @@ -625,16 +617,14 @@ static int panfrost_probe(struct platform_device *pdev)
>>>         */
>>>        err = drm_dev_register(ddev, 0);
>>>        if (err < 0)
>>> -             goto err_out2;
>>> +             goto err_out1;
>>>
>>>        panfrost_gem_shrinker_init(ddev);
>>>
>>>        return 0;
>>>
>>> -err_out2:
>>> -     pm_runtime_disable(pfdev->dev);
>>> -     panfrost_devfreq_fini(pfdev);
>>>    err_out1:
>>> +     pm_runtime_disable(pfdev->dev);
>>>        panfrost_device_fini(pfdev);
>>>    err_out0:
>>>        drm_dev_put(ddev);
>>> @@ -650,7 +640,6 @@ static int panfrost_remove(struct platform_device *pdev)
>>>        panfrost_gem_shrinker_cleanup(ddev);
>>>
>>>        pm_runtime_get_sync(pfdev->dev);
>>> -     panfrost_devfreq_fini(pfdev);
>>>        panfrost_device_fini(pfdev);
>>>        pm_runtime_put_sync_suspend(pfdev->dev);
>>>        pm_runtime_disable(pfdev->dev);
>>>
>>