On Thu, Dec 03, 2015 at 03:35:22PM +0200, Stanimir Varbanov wrote: > From: Stanimir Varbanov <svarbanov@xxxxxxxxxx> > > The PCIe driver reuse the Designware common code for host > and MSI initialization, and also program the Qualcomm > application specific registers. > > Signed-off-by: Stanimir Varbanov <svarbanov@xxxxxxxxxx> > Signed-off-by: Stanimir Varbanov <stanimir.varbanov@xxxxxxxxxx> > --- > MAINTAINERS | 7 + > drivers/pci/host/Kconfig | 10 + > drivers/pci/host/Makefile | 1 + > drivers/pci/host/pcie-qcom.c | 624 ++++++++++++++++++++++++++++++++++++++++++ > +#define PCIE20_CAP 0x70 > +#define PCIE20_CAP_LINKCTRLSTATUS (PCIE20_CAP + 0x10) > +#define PCIE20_CAP_LINKCTRLSTATUS_LINK_UP BIT(29) This looks like it could be referring to a standard PCIe Capability; could you use the existing PCI_EXP_LNKSTA and PCI_EXP_LNKSTA_DLLLA symbols here? And readw() instead of readl()? > +static int qcom_pcie_enable_link_training(struct qcom_pcie *pcie) > +{ > + struct device *dev = pcie->dev; > + u32 val; > + int ret; > + > + /* enable link training */ > + val = readl(pcie->elbi + PCIE20_ELBI_SYS_CTRL); > + val |= PCIE20_ELBI_SYS_CTRL_LT_ENABLE; > + writel(val, pcie->elbi + PCIE20_ELBI_SYS_CTRL); > + > + /* wait for up to 100ms for the link to come up */ > + ret = readl_poll_timeout(pcie->elbi + PCIE20_ELBI_SYS_STTS, val, > + val & XMLH_LINK_UP, LINKUP_DELAY_US, > + LINKUP_TIMEOUT_US); > + > + if (ret < 0 || !dw_pcie_link_up(&pcie->pp)) { > + dev_err(dev, "link initialization failed\n"); > + return -ETIMEDOUT; > + } > + > + return 0; > +} This looks a lot like the *_establish_link() functions in other DesignWare-based drivers. Can you make it look even more similar, e.g., by renaming it to qcom_pcie_establish_link() and maybe moving some of the PHY functionality here? readl_poll_timeout() is nice and avoids the hand-coded timeout loop the other drivers use. But is there benefit in checking for XMLH_LINK_UP, or could you simply poll dw_pcie_link_up() like the others do? If it's sufficient, I'd prefer using dw_pcie_link_up() by itself because it's a little more generic. Bjorn -- 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