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

[Pavel Machek]

On Sun 2015-11-29 20:48:53, Christian König wrote:
> 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.

Well, when I asked on the list "why this is happened" I got "umm,
noone knows" response that was not exactly helpful. And then someone
told me about agpmode.

If you know about the reasons it can fail, could you list them near
the DRM_ERROR, at least as a comment?

Thanks,
									Pavel

> 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;
> >  	}
> >

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