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powerpc/mpc85xx: Reset the PCIe bus on attach

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It seems if a Radeon card is already initialized by u-boot, it won't be
reinitialized by the kernel, and the DRM module will fail to attach.  This
steals the reset code from mips/octopci.c to blindly reset the bus on attach.
This was tested on a AmigaOne X5000/20, such that it can be booted from the
local video console, and get a video console in FreeBSD.
This commit is contained in:
Justin Hibbits 2018-10-30 00:47:40 +00:00
parent cd785c1b34
commit a37c714a0f
1 changed files with 12 additions and 1 deletions
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13
sys/powerpc/mpc85xx/pci_mpc85xx.c
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@ -562,7 +562,7 @@ fsl_pcib_init(struct fsl_pcib_softc *sc, int bus, int maxslot)
int new_pribus, new_secbus, new_subbus;
int slot, func, maxfunc;
uint16_t vendor, device;
uint8_t command, hdrtype, subclass;
uint8_t brctl, command, hdrtype, subclass;
secbus = bus;
for (slot = 0; slot <= maxslot; slot++) {
@ -606,6 +606,17 @@ fsl_pcib_init(struct fsl_pcib_softc *sc, int bus, int maxslot)
if (hdrtype != PCIM_HDRTYPE_BRIDGE)
continue;
brctl = fsl_pcib_read_config(sc->sc_dev, bus, slot, func,
PCIR_BRIDGECTL_1, 1);
brctl |= PCIB_BCR_SECBUS_RESET;
fsl_pcib_write_config(sc->sc_dev, bus, slot, func,
PCIR_BRIDGECTL_1, brctl, 1);
DELAY(100000);
brctl &= ~PCIB_BCR_SECBUS_RESET;
fsl_pcib_write_config(sc->sc_dev, bus, slot, func,
PCIR_BRIDGECTL_1, brctl, 1);
DELAY(100000);
secbus++;
/* Read currect bus register configuration */