https://github.com/torvalds/linux
Revision 81ee8fb6b52ec69eeed37fe7943446af1dccecc5 authored by Jerome Glisse on 27 July 2012, 20:32:24 UTC, committed by Alex Deucher on 13 August 2012, 14:50:52 UTC
It seems we can not update the crtc scanout address. After disabling
crtc, update to base address do not take effect after crtc being
reenable leading to at least frame being scanout from the old crtc
base address. Disabling crtc display request lead to same behavior.

So after changing the vram address if we don't keep crtc disabled
we will have the GPU trying to read some random system memory address
with some iommu this will broke the crtc engine and will lead to
broken display and iommu error message.

So to avoid this, disable crtc. For flicker less boot we will need
to avoid moving the vram start address.

This patch should also fix :

https://bugs.freedesktop.org/show_bug.cgi?id=42373

Cc: <stable@vger.kernel.org>
Signed-off-by: Jerome Glisse <jglisse@redhat.com>
1 parent 5b23c90
History
Tip revision: 81ee8fb6b52ec69eeed37fe7943446af1dccecc5 authored by Jerome Glisse on 27 July 2012, 20:32:24 UTC
drm/radeon: do not reenable crtc after moving vram start address
Tip revision: 81ee8fb
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