linux-kernel - Re: [PATCH] drm/radeon: Always call radeon_suspend_kms() in radeon_pci

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Date:   Tue, 8 Jun 2021 10:54:05 -0400
From:   Alex Deucher <alexdeucher@...il.com>
To:     Tiezhu Yang <yangtiezhu@...ngson.cn>
Cc:     Christian König <christian.koenig@....com>,
        Alex Deucher <alexander.deucher@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Jianmin Lv <lvjianmin@...ngson.cn>,
        Xuefeng Li <lixuefeng@...ngson.cn>,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/radeon: Always call radeon_suspend_kms() in radeon_pci_shutdown()

On Mon, Jun 7, 2021 at 10:26 PM Tiezhu Yang <yangtiezhu@...ngson.cn> wrote:
>
> On 06/07/2021 09:42 PM, Alex Deucher wrote:
> > On Mon, Jun 7, 2021 at 8:30 AM Christian König <christian.koenig@....com> wrote:
> >> Am 07.06.21 um 14:27 schrieb Tiezhu Yang:
> >>> radeon_suspend_kms() puts the hw in the suspend state (all asics),
> >>> it should always call radeon_suspend_kms() in radeon_pci_shutdown(),
> >>> this is a normal cleanup process to avoid more operations on radeon,
> >>> just remove #ifdef CONFIG_PPC64 and the related comments.
> >> Well NAK.
> >>
> >> Alex knows more about the details but suspending should not be part of
> >> the pci shotdown process at all.
> >>
> >> We just add that here to enforce a GPU reset on PPC64 boards for some
> >> reason.
> > Everything in the comment still applies.
> >
> > Alex
>
> Hi Alex and Christian,
>
> Thanks for your quick reply. What do you think of the following changes?
> If it is OK, I will send v2. If no, please ignore it.
>
> Any comments will be much appreciated.

Looks fine.  Please send it out.

Alex

>
> Thanks,
> Tiezhu
>
>
> Subject: [PATCH] drm/radeon: Call radeon_suspend_kms() in
>   radeon_pci_shutdown() for Loongson64
>
> On the Loongson64 platform used with Radeon GPU, shutdown or reboot failed
> when console=tty is in the boot cmdline.
>
> radeon_suspend_kms() puts the hw in the suspend state, especially set fb
> state as FBINFO_STATE_SUSPENDED:
>
>      if (fbcon) {
>          console_lock();
>          radeon_fbdev_set_suspend(rdev, 1);
>          console_unlock();
>      }
>
> Then avoid to do any more fb operations in the related functions:
>
>      if (p->state != FBINFO_STATE_RUNNING)
>          return;
>
> So call radeon_suspend_kms() in radeon_pci_shutdown() for Loongson64 to fix
> this issue, it looks like some kind of workaround like powerpc.
>
> Co-developed-by: Jianmin Lv <lvjianmin@...ngson.cn>
> Signed-off-by: Jianmin Lv <lvjianmin@...ngson.cn>
> Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
> ---
>   drivers/gpu/drm/radeon/radeon_drv.c | 8 ++++----
>   1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/radeon/radeon_drv.c
> b/drivers/gpu/drm/radeon/radeon_drv.c
> index efeb115..daabbf5 100644
> --- a/drivers/gpu/drm/radeon/radeon_drv.c
> +++ b/drivers/gpu/drm/radeon/radeon_drv.c
> @@ -386,13 +386,13 @@ radeon_pci_shutdown(struct pci_dev *pdev)
>       if (radeon_device_is_virtual())
>           radeon_pci_remove(pdev);
>
> -#ifdef CONFIG_PPC64
> +#if defined(CONFIG_PPC64) || defined(CONFIG_MACH_LOONGSON64)
>       /*
>        * Some adapters need to be suspended before a
>        * shutdown occurs in order to prevent an error
> -     * during kexec.
> -     * Make this power specific becauase it breaks
> -     * some non-power boards.
> +     * during kexec, shutdown or reboot.
> +     * Make this power and Loongson specific becauase
> +     * it breaks some other boards.
>        */
>       radeon_suspend_kms(pci_get_drvdata(pdev), true, true, false);
>   #endif
> --
> 2.1.0
>