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Date: Mon, 8 Jun 2020 13:55:32 +0200
From: Tomeu Vizoso <tomeu.vizoso@...labora.com>
To: Clément Péron <peron.clem@...il.com>,
Steven Price <steven.price@....com>
Cc: Rob Herring <robh@...nel.org>,
Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>,
Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
Stephen Boyd <sboyd@...nel.org>,
Maxime Ripard <mripard@...nel.org>,
Chen-Yu Tsai <wens@...e.org>,
dri-devel <dri-devel@...ts.freedesktop.org>,
linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 08/15] drm/panfrost: move devfreq_init()/fini() in device
On 5/29/20 2:38 PM, Clément Péron wrote:
> Hi Steven
>
> On Thu, 28 May 2020 at 15:22, Steven Price <steven.price@....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@...il.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);
>>>
>>
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