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dde_bsd: remove disabling of MSIs

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Issue #1498.
This commit is contained in:
Josef Söntgen
2015-05-07 18:22:42 +02:00
committed by Christian Helmuth
parent 4736488d99
commit 11d5f07862
3 changed files with 40 additions and 2 deletions
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38
repos/dde_bsd/patches/azalia_c.patch Normal file
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@@ -0,0 +1,38 @@
diff --git a/dev/pci/azalia.c b/dev/pci/azalia.c
index b126ef6..f73c238 100644
--- a/dev/pci/azalia.c
+++ b/dev/pci/azalia.c
@@ -492,7 +492,7 @@ azalia_pci_attach(struct device *parent, struct device *self, void *aux)
azalia_t *sc;
struct pci_attach_args *pa;
pcireg_t v;
- uint8_t reg;
+ // uint8_t reg;
pci_intr_handle_t ih;
const char *interrupt_str;
@@ -518,12 +518,18 @@ azalia_pci_attach(struct device *parent, struct device *self, void *aux)
azalia_configure_pci(sc);
- /* disable MSI, use INTx instead */
- if (PCI_VENDOR(sc->pciid) == PCI_VENDOR_INTEL) {
- reg = azalia_pci_read(sc->pc, sc->tag, ICH_PCI_MMC);
- reg &= ~(ICH_PCI_MMC_ME);
- azalia_pci_write(sc->pc, sc->tag, ICH_PCI_MMC, reg);
- }
+ // This was added in CVS rev 1.168 because certain devices do not
+ // support MSIs. For reasons that are not clear yet, this breaks
+ // when using the platform_drv on x86 with MSI support and IOMMU
+ // enabled. All hw we tested seems to work fine when it is removed,
+ // even older kernels, e.g. OKL4, that use legacy IRQs,
+ //
+ // /* disable MSI, use INTx instead */
+ // if (PCI_VENDOR(sc->pciid) == PCI_VENDOR_INTEL) {
+ // reg = azalia_pci_read(sc->pc, sc->tag, ICH_PCI_MMC);
+ // reg &= ~(ICH_PCI_MMC_ME);
+ // azalia_pci_write(sc->pc, sc->tag, ICH_PCI_MMC, reg);
+ // }
/* interrupt */
if (pci_intr_map_msi(pa, &ih) && pci_intr_map(pa, &ih)) {