On 01/29/2015 03:54 PM, Deucher, Alexander wrote:
-----Original Message-----
From: Gabbay, Oded
Sent: Thursday, January 29, 2015 2:46 AM
To: Alex Deucher; dri-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: Deucher, Alexander; stable@xxxxxxxxxxxxxxx
Subject: Re: [PATCH] drm/radeon: don't init gpuvm if accel is disabled
On 01/28/2015 09:41 PM, Alex Deucher wrote:
If acceleration is disabled, it does not make sense
to init gpuvm since nothing will use it. Moreover,
if radeon_vm_init() gets called it uses accel to try
and clear the pde tables, etc. which results in a bug.
Bug:
https://bugs.freedesktop.org/show_bug.cgi?id=88786
Signed-off-by: Alex Deucher<alexander.deucher@xxxxxxx>
Cc:stable@xxxxxxxxxxxxxxx
Alex,
What is accel ?
If the ring tests fail and for some reason the IPs (e.g., gfx or sdma) are not available, the driver disables acceleration and basically falls back to modesetting only.
Is there a situation where accel is disabled and HSA should work ? e.g.
headless
mode ?
No. We only disable acceleration if we can't get the IPs (gfx, sdma) initialized. Headless has nothing to do with acceleration in this context.
Alex
OK, thanks for the explanation.
Oded
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