[radeon r100] when ring test fails, provide users with option to test

[Christian König]

On 28.11.2015 21:58, Pavel Machek wrote:
> Ring test failure is often caused by too high agpmode. Tell the user
> what to try.
>
> Signed-off-by: Pavel Machek <pavel at ucw.cz>

NAK, the ring test can fail for any number of reasons and the agpmode is 
actually rather unlikely to be the cause.

Regards,
Christian.

>
> diff --git a/drivers/gpu/drm/radeon/r100.c b/drivers/gpu/drm/radeon/r100.c
> index 238b13f..32b1917 100644
> --- a/drivers/gpu/drm/radeon/r100.c
> +++ b/drivers/gpu/drm/radeon/r100.c
> @@ -3665,7 +3665,7 @@ int r100_ring_test(struct radeon_device *rdev, struct radeon_ring *ring)
>   	if (i < rdev->usec_timeout) {
>   		DRM_INFO("ring test succeeded in %d usecs\n", i);
>   	} else {
> -		DRM_ERROR("radeon: ring test failed (scratch(0x%04X)=0x%08X)\n",
> +		DRM_ERROR("radeon: ring test failed (scratch(0x%04X)=0x%08X), try radeon.agpmode=1?\n",
>   			  scratch, tmp);
>   		r = -EINVAL;
>   	}
>