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Message-ID: <CA+7wUszw=fF_kUW+Et07nnX1=0VBtrPJU6yfZsuk_uLUJPQsmw@mail.gmail.com>
Date:   Tue, 24 Apr 2018 21:56:42 +0200
From:   Mathieu Malaterre <malat@...ian.org>
To:     Christian König <christian.koenig@....com>
Cc:     Alex Deucher <alexander.deucher@....com>,
        "David (ChunMing) Zhou" <David1.Zhou@....com>,
        David Airlie <airlied@...ux.ie>, amd-gfx@...ts.freedesktop.org,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/radeon: Change the default to PCI on PowerPC

For reference:

https://lists.freedesktop.org/archives/mesa-dev/2016-May/115453.html

2018-04-24 21:55 GMT+02:00 Mathieu Malaterre <malat@...ian.org>:
> AGP mode is unstable on PowerPC. Symptoms are generally of the form:
>
> [ 1228.795711] radeon 0000:00:10.0: ring 0 stalled for more than 10240msec
>
> Reviewed-by: Christian König <christian.koenig@....com>
> Signed-off-by: Mathieu Malaterre <malat@...ian.org>
> ---
>  drivers/gpu/drm/radeon/radeon_drv.c | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/drivers/gpu/drm/radeon/radeon_drv.c b/drivers/gpu/drm/radeon/radeon_drv.c
> index b28288a781ef..2a7977a23b31 100644
> --- a/drivers/gpu/drm/radeon/radeon_drv.c
> +++ b/drivers/gpu/drm/radeon/radeon_drv.c
> @@ -168,7 +168,12 @@ int radeon_no_wb;
>  int radeon_modeset = -1;
>  int radeon_dynclks = -1;
>  int radeon_r4xx_atom = 0;
> +#ifdef __powerpc__
> +/* Default to PCI on PowerPC (fdo #95017) */
> +int radeon_agpmode = -1;
> +#else
>  int radeon_agpmode = 0;
> +#endif
>  int radeon_vram_limit = 0;
>  int radeon_gart_size = -1; /* auto */
>  int radeon_benchmarking = 0;
> --
> 2.11.0
>

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