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

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Message-ID: <CAAd53p4y+A5Bv4nUKZw+kzrmxcYm8DXrY06QqkU4iopj0dRrzw@mail.gmail.com>
Date:   Mon, 22 Feb 2021 15:08:19 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     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

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...

>
> > ---
> >  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

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