[PATCH] Disable "acceleration" under qemu

[Stefan Dirsch]

Disable "acceleration" under qemu, since taking the hypercall trap
is really quite expensive and you're better off doing noaccel. Patch
is based on the one by "Adam Jackson" <ajax at redhat.com>

http://pkgs.fedoraproject.org/cgit/rpms/xorg-x11-drv-cirrus.git/tree/cirrus-1.2.0-qemu.patch?id=daccd1c8174623500eddfa297d8ea76a86d3c5d9
---
 src/alp_driver.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/alp_driver.c b/src/alp_driver.c
index bd5e52f..ba55247 100644
--- a/src/alp_driver.c
+++ b/src/alp_driver.c
@@ -774,6 +774,16 @@ AlpPreInit(ScrnInfoPtr pScrn, int flags)
      else
  	xf86SetDDCproperties(pScrn,xf86PrintEDID(
 		 xf86DoEDID_DDC2(XF86_SCRN_ARG(pScrn),pCir->I2CPtr1)));
+
+#ifdef XSERVER_LIBPCIACCESS
+     #ifndef PCI_CHIP_QEMU
+     #define PCI_CHIP_QEMU 0x1af4
+     #endif
+     if (!pScrn->monitor->DDC &&
+	((pCir->PciInfo->subvendor_id & 0xffff) == PCI_CHIP_QEMU)) {
+	pCir->NoAccel = TRUE;
+     }
+#endif
  
      /* Probe the possible LCD display */
      AlpProbeLCD(pScrn);
-- 
2.6.2