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

["Clément Péron" <peron.clem@gmail.com>]

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

>
> >       }
> >
> >       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);
> >
>