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Subject: Re: [PATCH] drm: meson_drv add shutdown function
To:     Kevin Hilman <khilman@baylibre.com>,
        Artem Lapkin <email2tema@gmail.com>
Cc:     jbrunet@baylibre.com, martin.blumenstingl@googlemail.com,
        dri-devel@lists.freedesktop.org,
        linux-arm-kernel@lists.infradead.org,
        linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org,
        christianshewitt@gmail.com, art@khadas.com, nick@khadas.com,
        gouwa@khadas.com
References: <20210302042202.3728113-1-art@khadas.com>
 <e033540e-3a4f-3dd7-a1b0-d5a0241e845a@baylibre.com>
 <7h35x42qtt.fsf@baylibre.com>
From:   Neil Armstrong <narmstrong@baylibre.com>
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Organization: Baylibre
Message-ID: <875c606f-baf9-f92a-4820-39d3d7312607@baylibre.com>
Date:   Tue, 9 Mar 2021 18:22:27 +0100
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On 09/03/2021 18:13, Kevin Hilman wrote:
> Hi Neil,
> 
> Neil Armstrong <narmstrong@baylibre.com> writes:
> 
>> On 02/03/2021 05:22, Artem Lapkin wrote:
>>> Problem: random stucks on reboot stage about 1/20 stuck/reboots
>>> // debug kernel log
>>> [    4.496660] reboot: kernel restart prepare CMD:(null)
>>> [    4.498114] meson_ee_pwrc c883c000.system-controller:power-controller: shutdown begin
>>> [    4.503949] meson_ee_pwrc c883c000.system-controller:power-controller: shutdown domain 0:VPU...
>>> ...STUCK...
>>>
>>> Solution: add shutdown function to meson_drm driver 
>>> // debug kernel log
>>> [    5.231896] reboot: kernel restart prepare CMD:(null)
>>> [    5.246135] [drm:meson_drv_shutdown]
>>> ...
>>> [    5.259271] meson_ee_pwrc c883c000.system-controller:power-controller: shutdown begin
>>> [    5.274688] meson_ee_pwrc c883c000.system-controller:power-controller: shutdown domain 0:VPU...
>>> [    5.338331] reboot: Restarting system
>>> [    5.358293] psci: PSCI_0_2_FN_SYSTEM_RESET reboot_mode:0 cmd:(null)
>>> bl31 reboot reason: 0xd
>>> bl31 reboot reason: 0x0
>>> system cmd  1.
>>> ...REBOOT...
>>>
>>> Tested: on VIM1 VIM2 VIM3 VIM3L khadas sbcs - 1000+ successful reboots
>>> and Odroid boards, WeTek Play2 (GXBB)
>>>
>>> Tested-by: Christian Hewitt <christianshewitt@gmail.com>
>>> Signed-off-by: Artem Lapkin <art@khadas.com>
>>>
>>> ---
>>>  drivers/gpu/drm/meson/meson_drv.c | 11 +++++++++++
>>>  1 file changed, 11 insertions(+)
>>>
>>> diff --git a/drivers/gpu/drm/meson/meson_drv.c b/drivers/gpu/drm/meson/meson_drv.c
>>> index 42c5d3246..693bb1293 100644
>>> --- a/drivers/gpu/drm/meson/meson_drv.c
>>> +++ b/drivers/gpu/drm/meson/meson_drv.c
>>> @@ -482,6 +482,16 @@ static int meson_probe_remote(struct platform_device *pdev,
>>>  	return count;
>>>  }
>>>  
>>> +static void meson_drv_shutdown(struct platform_device *pdev)
>>> +{
>>> +	struct meson_drm *priv = dev_get_drvdata(&pdev->dev);
>>> +	struct drm_device *drm = priv->drm;
>>> +
>>> +	DRM_DEBUG_DRIVER("\n");
>>> +	drm_kms_helper_poll_fini(drm);
>>> +	drm_atomic_helper_shutdown(drm);
>>> +}
>>> +
>>>  static int meson_drv_probe(struct platform_device *pdev)
>>>  {
>>>  	struct component_match *match = NULL;
>>> @@ -553,6 +563,7 @@ static const struct dev_pm_ops meson_drv_pm_ops = {
>>>  
>>>  static struct platform_driver meson_drm_platform_driver = {
>>>  	.probe      = meson_drv_probe,
>>> +	.shutdown   = meson_drv_shutdown,
>>>  	.driver     = {
>>>  		.name	= "meson-drm",
>>>  		.of_match_table = dt_match,
>>>
>>
>> Applied to drm-misc-fixes,
> 
> Could you submit this as a fix to stable (v5.10+) also?

It should be done automagically since I added the Fixes tag

neil

> 
> Thanks,
> 
> Kevin
>