From: Linus Torvalds Date: Fri, 26 Aug 2005 17:49:22 +0000 (-0700) Subject: Ignore disabled ROM resources at setup X-Git-Tag: firefly_0821_release~42244 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=755528c860b05fcecda1c88a2bdaffcb50760a7f;p=firefly-linux-kernel-4.4.55.git Ignore disabled ROM resources at setup Writing even a disabled value seems to mess up some matrox graphics cards. It may be a card-related issue, but we may also be writing reserved low bits in the result. This was a fall-out of switching x86 over to the generic PCI resource allocation code, and needs more debugging. In particular, the old x86 code defaulted to not doing any resource allocations at all for ROM resources. In the meantime, this has been reported to make X happier by Helge Hafting . Signed-off-by: Linus Torvalds --- diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c index 84eedc965688..5598b4714f77 100644 --- a/drivers/pci/setup-res.c +++ b/drivers/pci/setup-res.c @@ -53,7 +53,9 @@ pci_update_resource(struct pci_dev *dev, struct resource *res, int resno) if (resno < 6) { reg = PCI_BASE_ADDRESS_0 + 4 * resno; } else if (resno == PCI_ROM_RESOURCE) { - new |= res->flags & IORESOURCE_ROM_ENABLE; + if (!(res->flags & IORESOURCE_ROM_ENABLE)) + return; + new |= PCI_ROM_ADDRESS_ENABLE; reg = dev->rom_base_reg; } else { /* Hmm, non-standard resource. */