andreacavalli/xserver-multidpi
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dri2: Stop pretending VGA arbitration matters

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The VGA arbiter controls the PCI bus' routing of legacy VGA resources,
specifically the video memory aperture at 0xa0000-0xb0000 (640k should
be etc.) and a handful of I/O ports. Since 128k is far too small for a
real framebuffer these days, every driver instead maps a linear version
of VRAM through the PCI BAR. And no DRI2 drivers ever need I/O port
access, because all operations they might be used for (legacy VGA CRTC
setup, mostly) happen on the kernel side.

In other words, this just works, and we can stop breaking it.

Signed-off-by: Adam Jackson <ajax@redhat.com>
Reviewed-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Adam Jackson 2019-01-23 14:23:40 -05:00
parent d3a26bbf61
commit ff56048855
1 changed files with 0 additions and 7 deletions
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7
hw/xfree86/dri2/dri2.c
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@ -44,7 +44,6 @@
#include "dixstruct.h"
#include "dri2.h"
#include "dri2int.h"
#include "xf86VGAarbiter.h"
#include "damage.h"
#include "xf86.h"
@ -1507,12 +1506,6 @@ DRI2ScreenInit(ScreenPtr pScreen, DRI2InfoPtr info)
if (info->version < 3)
return FALSE;
if (!xf86VGAarbiterAllowDRI(pScreen)) {
xf86DrvMsg(pScreen->myNum, X_WARNING,
"[DRI2] Direct rendering is not supported when VGA arb is necessary for the device\n");
return FALSE;
}
if (!dixRegisterPrivateKey(&dri2ScreenPrivateKeyRec, PRIVATE_SCREEN, 0))
return FALSE;