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 at lists.freedesktop.org >> Cc: Deucher, Alexander; stable at vger.kernel.org >> 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 at amd.com> >>> Cc:stable at vger.kernel.org >> 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