Searched hist:259679 (Results 1 - 1 of 1) sorted by relevance
| /freebsd-11-stable/sys/dev/pci/ | ||
| H A D | vga_pci.c | diff 259679 Sat Dec 21 11:06:35 MST 2013 dumbbell vga_pci: Improve boot display detection The previous code was checking the "VGA Enable" bit on the video card's parent PCI-to-PCI bridge only. This didn't work for the case where the video card is attached to the root PCI bus (ie. the card has no parent PCI-to-PCI bridge). Now, the new code: 1. checks the "VGA Enable" bit on the parent bridge only if it's a PCI-to-PCI bridge; 2. always checks the "I/O" and "Memory address space decoding" bits on the video card itself. However, vendor-specific bits are not used. This fixes the use of many integrated Radeon cards: without this patch, we fail to detect them as the boot display and, when radeonkms looks for the Video BIOS, it skips the shadow copy made by the System BIOS. It then fails to fully initialize the card, because the shadow copy is the only way to read the Video BIOS in these situations. A workaround was to force the boot display selection using the "hw.pci.default_vgapci_unit" tunable. A previous version of this patch added a new function doing the checks. Now, the vga_pci_is_boot_display() function is used to perform the checks (only until the boot display is found) and return if the given device is the boot display or not. Furthermore, vga_pci_attach() logs "Boot video device" if the card being attached it the Chosen One: vgapci0: <VGA-compatible display> [...] vgapci0: Boot video device Reviewed by: kib@, jhb@ (both a previous version) Tested by: lunatic_ (#freebsd-xorg, integrated Radeon card, xmj (#freebsd-xorg, i915+NVIDIA cards) |
Completed in 163 milliseconds