On Tuesday 11 October 2016 06:28 PM, Kishon Vijay Abraham I wrote: > PCIe in AM57x/DRA7x devices is by default > configured to work in GEN2 mode. However there > may be situations when working in GEN1 mode is > desired. One example is limitation i925 (PCIe GEN2 > mode not supported at junction temperatures < 0C). > > Add support to force Root Complex to work in GEN1 > mode if so desired, but don't force GEN1 mode on > any board just yet. > > Signed-off-by: Kishon Vijay Abraham I <kishon@xxxxxx> > Signed-off-by: Sekhar Nori <nsekhar@xxxxxx> > --- > Documentation/devicetree/bindings/pci/ti-pci.txt | 1 + > drivers/pci/host/pci-dra7xx.c | 27 ++++++++++++++++++++++ > 2 files changed, 28 insertions(+) > > diff --git a/Documentation/devicetree/bindings/pci/ti-pci.txt b/Documentation/devicetree/bindings/pci/ti-pci.txt > index 60e2516..a3d6ca3 100644 > --- a/Documentation/devicetree/bindings/pci/ti-pci.txt > +++ b/Documentation/devicetree/bindings/pci/ti-pci.txt > @@ -25,6 +25,7 @@ PCIe Designware Controller > > Optional Property: > - gpios : Should be added if a gpio line is required to drive PERST# line > + - ti,pcie-is-gen1 : Force the PCIe controller to work in GEN1 (2.5 GT/s). > > Example: > axi { > diff --git a/drivers/pci/host/pci-dra7xx.c b/drivers/pci/host/pci-dra7xx.c > index 4ccba6d..2a669cb 100644 > --- a/drivers/pci/host/pci-dra7xx.c > +++ b/drivers/pci/host/pci-dra7xx.c > @@ -63,11 +63,14 @@ > #define LINK_UP BIT(16) > #define DRA7XX_CPU_TO_BUS_ADDR 0x0FFFFFFF > > +#define EXP_CAP_ID_OFFSET 0x70 > + > struct dra7xx_pcie { > struct pcie_port pp; > void __iomem *base; /* DT ti_conf */ > int phy_count; /* DT phy-names count */ > struct phy **phy; > + bool is_gen1; I think it will be nice to reference the errata number as comments in the code along with references to TI public documentation that explains the said errata. Or may be this can be added to the binding documentation. Somewhere 'git grep' can find. BTW, per Documentation/devicetree/bindings/submitting-patches.txt, the binding documentation should be a separate patch. Thanks, Sekhar -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html