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Date: Wed, 16 Nov 2016 08:15:52 -0800 From: Tim Harvey <tharvey@...eworks.com> To: Fabio Estevam <festevam@...il.com> Cc: Bjorn Helgaas <bhelgaas@...gle.com>, Joao Pinto <Joao.Pinto@...opsys.com>, Jisheng Zhang <jszhang@...vell.com>, Jingoo Han <jingoohan1@...il.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>, Lucas Stach <l.stach@...gutronix.de> Subject: Re: [PATCH v6 4/4] PCI: designware: Add iATU Unroll feature On Tue, Nov 15, 2016 at 4:30 PM, Fabio Estevam <festevam@...il.com> wrote: > Hi Tim, > > On Tue, Nov 15, 2016 at 10:22 PM, Tim Harvey <tharvey@...eworks.com> wrote: > >> Bjorn / Joao, >> >> This patch (from commit a0601a47053714eecec726aea5ebcd829f817497) is >> causing a kernel regression in 4.9. I can no longer boot the kernel on >> boards that have a PCIe switch downstream from the IMX6 (ie many of >> the Gateworks Ventana boards) unless PCI is enabled in the bootloader >> (which is not recommended as that causes PCI link in the kernel to >> occasionally fail). > > This has been fixed in 4.9-rc4 by the following commit: > > commit 416379f9ebded501eda882e6af0a7aafc1866700 > Author: Niklas Cassel <niklas.cassel@...s.com> > Date: Fri Oct 14 23:54:55 2016 +0200 > > PCI: designware: Check for iATU unroll support after initializing host > > dw_pcie_iatu_unroll_enabled() reads a dbi_base register. Reading any > dbi_base register before pp->ops->host_init has been called causes > "imprecise external abort" on platforms like ARTPEC-6, where the PCIe > module is disabled at boot and first enabled in pp->ops->host_init. Move > dw_pcie_iatu_unroll_enabled() to dw_pcie_setup_rc(), since it is after > pp->ops->host_init, but before pp->iatu_unroll_enabled is actually used. > > Fixes: a0601a470537 ("PCI: designware: Add iATU Unroll feature") > Tested-by: James Le Cuirot <chewi@...too.org> > Signed-off-by: Niklas Cassel <niklas.cassel@...s.com> > Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com> > Acked-by: Joao Pinto <jpinto@...opsys.com> > Acked-by: Olof Johansson <olof@...om.net> Fabio, That does indeed resolve the issue! Thanks, Tim
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