linux-kernel - Re: [PATCH] efifb: Ensure graphics device for efifb stays at PCI D0

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Message-ID: <5f2dfeb9-7600-2426-bd50-0da48eb72b5f@suse.de>
Date:   Mon, 22 Feb 2021 09:07:45 +0100
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>, pjones@...hat.com
Cc:     Alex Deucher <alexdeucher@...il.com>,
        Hans de Goede <hdegoede@...hat.com>,
        "open list:EFIFB FRAMEBUFFER DRIVER" <linux-fbdev@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:FRAMEBUFFER LAYER" <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH] efifb: Ensure graphics device for efifb stays at PCI D0

Hi

Am 22.02.21 um 08:08 schrieb Kai-Heng Feng:
> On Mon, Feb 1, 2021 at 11:21 PM Alex Deucher <alexdeucher@...il.com> wrote:
>>
>> On Sat, Jan 30, 2021 at 6:27 AM Kai-Heng Feng
>> <kai.heng.feng@...onical.com> wrote:
>>>
>>> We are seeing root ports on some desktop boards support D3cold for
>>> discrete graphics card. So when efifb is in use while graphics device
>>> isn't bound to a driver, PCI and ACPI will put the graphics to D3cold
>>> when runtime suspend kicks in, makes efifb stop working.
>>>
>>> So ensure the graphics device won't be runtime suspended, to keep efifb
>>> work all the time.
>>>
>>> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
>>
>> Reviewed-by: Alex Deucher <alexander.deucher@....com>
> 
> A gentle ping...

Thanks for your patch. I've added it to drm-misc-next.

Best regards
Thomas

> 
>>
>>> ---
>>>   drivers/video/fbdev/efifb.c | 3 +++
>>>   1 file changed, 3 insertions(+)
>>>
>>> diff --git a/drivers/video/fbdev/efifb.c b/drivers/video/fbdev/efifb.c
>>> index e57c00824965..19edd7206409 100644
>>> --- a/drivers/video/fbdev/efifb.c
>>> +++ b/drivers/video/fbdev/efifb.c
>>> @@ -16,6 +16,7 @@
>>>   #include <linux/platform_device.h>
>>>   #include <linux/printk.h>
>>>   #include <linux/screen_info.h>
>>> +#include <linux/pm_runtime.h>
>>>   #include <video/vga.h>
>>>   #include <asm/efi.h>
>>>   #include <drm/drm_utils.h> /* For drm_get_panel_orientation_quirk */
>>> @@ -575,6 +576,7 @@ static int efifb_probe(struct platform_device *dev)
>>>                  goto err_fb_dealoc;
>>>          }
>>>          fb_info(info, "%s frame buffer device\n", info->fix.id);
>>> +       pm_runtime_get_sync(&efifb_pci_dev->dev);
>>>          return 0;
>>>
>>>   err_fb_dealoc:
>>> @@ -601,6 +603,7 @@ static int efifb_remove(struct platform_device *pdev)
>>>          unregister_framebuffer(info);
>>>          sysfs_remove_groups(&pdev->dev.kobj, efifb_groups);
>>>          framebuffer_release(info);
>>> +       pm_runtime_put(&efifb_pci_dev->dev);
>>>
>>>          return 0;
>>>   }
>>> --
>>> 2.29.2
>>>
>>> _______________________________________________
>>> dri-devel mailing list
>>> dri-devel@...ts.freedesktop.org
>>> https://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer

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