From fd5cee7ce8f488768f918e73231d4859a520eb33 Mon Sep 17 00:00:00 2001 From: Gavin Shan Date: Thu, 24 Apr 2014 18:00:22 +1000 Subject: [PATCH] powerpc/powernv: Reset root port in firmware Resetting root port has more stuff to do than that for PCIe switch ports and we should have resetting root port done in firmware instead of the kernel itself. The problem was introduced by commit 5b2e198e ("powerpc/powernv: Rework EEH reset"). Cc: linux-stable Signed-off-by: Gavin Shan Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/platforms/powernv/eeh-ioda.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) diff --git a/arch/powerpc/platforms/powernv/eeh-ioda.c b/arch/powerpc/platforms/powernv/eeh-ioda.c index 3a755b5f9952..0844e00ccdd8 100644 --- a/arch/powerpc/platforms/powernv/eeh-ioda.c +++ b/arch/powerpc/platforms/powernv/eeh-ioda.c @@ -510,12 +510,10 @@ static int ioda_eeh_reset(struct eeh_pe *pe, int option) int ret; /* - * The rules applied to reset, either fundamental or hot reset: - * - * We always reset the direct upstream bridge of the PE. If the - * direct upstream bridge isn't root bridge, we always take hot - * reset no matter what option (fundamental or hot) is. Otherwise, - * we should do the reset according to the required option. + * For PHB reset, we always have complete reset. For those PEs whose + * primary bus derived from root complex (root bus) or root port + * (usually bus#1), we apply hot or fundamental reset on the root port. + * For other PEs, we always have hot reset on the PE primary bus. * * Here, we have different design to pHyp, which always clear the * frozen state during PE reset. However, the good idea here from @@ -529,7 +527,8 @@ static int ioda_eeh_reset(struct eeh_pe *pe, int option) ret = ioda_eeh_phb_reset(hose, option); } else { bus = eeh_pe_bus_get(pe); - if (pci_is_root_bus(bus)) + if (pci_is_root_bus(bus) || + pci_is_root_bus(bus->parent)) ret = ioda_eeh_root_reset(hose, option); else ret = ioda_eeh_bridge_reset(bus->self, option);