On 04/01/2018 14:54, Koen Vandeputte wrote: > By default, the subordinate is set equally to the secondary bus (1) when > the RC boots, and does not alter afterwards. > > This means that theoretically, the highest bus reachable downstream is > bus 1. > > Force the PCIe RC subordinate to 0xff, otherwise no downstream > devices will be detected behind bus 1 if the booting OS does not allow > enumerating a higher busnr than the subordinate value of the primary > bus. > > Signed-off-by: Koen Vandeputte <koen.vandepu...@ncentric.com> > --- > drivers/pci/pcie_imx.c | 11 +++++++++++ > 1 file changed, 11 insertions(+) > > diff --git a/drivers/pci/pcie_imx.c b/drivers/pci/pcie_imx.c > index 2900c8d..9277af9 100644 > --- a/drivers/pci/pcie_imx.c > +++ b/drivers/pci/pcie_imx.c > @@ -612,6 +612,17 @@ static int imx_pcie_link_up(void) > imx_pcie_regions_setup(); > > /* > + * By default, the subordinate is set equally to the secondary > + * bus (0x01) when the RC boots. > + * This means that theoretically, only bus 1 is reachable from the RC. > + * Force the PCIe RC subordinate to 0xff, otherwise no downstream > + * devices will be detected if the enumeration is applied strictly. > + */ > + tmp = readl(MX6_DBI_ADDR + 0x18); > + tmp |= (0xff << 16); > + writel(tmp, MX6_DBI_ADDR + 0x18); > + > + /* > * FIXME: Force the PCIe RC to Gen1 operation > * The RC must be forced into Gen1 mode before bringing the link > * up, otherwise no downstream devices are detected. After the >
Applied to u-boot-imx, thanks ! Best regards, Stefano Babic -- ===================================================================== DENX Software Engineering GmbH, Managing Director: Wolfgang Denk HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: +49-8142-66989-53 Fax: +49-8142-66989-80 Email: sba...@denx.de ===================================================================== _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot
