Hi Johan, Thanks for your review comments. On Mon, Jun 20 2022, Johan Hovold wrote: > On Sun, Jun 12, 2022 at 01:18:35PM +0300, Baruch Siach wrote: >> From: Selvam Sathappan Periakaruppan <quic_speriaka@xxxxxxxxxxx> >> >> IPQ60xx series of SoCs have one port of PCIe gen 3. Add support for that >> platform. >> >> The code is based on downstream[1] Codeaurora kernel v5.4 (branch >> win.linuxopenwrt.2.0). >> >> Split out the DBI registers access part from .init into .post_init. DBI >> registers are only accessible after phy_power_on(). >> >> [1] https://source.codeaurora.org/quic/qsdk/oss/kernel/linux-ipq-5.4/ >> >> Signed-off-by: Selvam Sathappan Periakaruppan <speriaka@xxxxxxxxxxxxxx> >> Signed-off-by: Baruch Siach <baruch.siach@xxxxxxxxx> >> --- > >> +static void qcom_pcie_deinit_2_9_0(struct qcom_pcie *pcie) >> +{ >> + struct qcom_pcie_resources_2_9_0 *res = &pcie->res.v2_9_0; >> + >> + clk_bulk_disable_unprepare(ARRAY_SIZE(res->clks), res->clks); > > Assert reset as you do in the init error path? Not sure about that. As I understand, the reset assert/deassert sequence on init is meant to ensure clean startup state. Deinit most likely does not need that. So maybe I should remove reset assert from init error path instead? As always, this code sequence is from downstream kernel. I have no access to documentation. baruch >> +} >> + >> +static int qcom_pcie_init_2_9_0(struct qcom_pcie *pcie) >> +{ >> + struct qcom_pcie_resources_2_9_0 *res = &pcie->res.v2_9_0; >> + struct device *dev = pcie->pci->dev; >> + int ret; >> + >> + ret = reset_control_assert(res->rst); >> + if (ret) { >> + dev_err(dev, "reset assert failed (%d)\n", ret); >> + return ret; >> + } >> + >> + /* >> + * Delay periods before and after reset deassert are working values >> + * from downstream Codeaurora kernel >> + */ >> + usleep_range(2000, 2500); >> + >> + ret = reset_control_deassert(res->rst); >> + if (ret) { >> + dev_err(dev, "reset deassert failed (%d)\n", ret); >> + return ret; >> + } >> + >> + usleep_range(2000, 2500); >> + >> + ret = clk_bulk_prepare_enable(ARRAY_SIZE(res->clks), res->clks); >> + if (ret) >> + goto err_reset; >> + >> + return 0; >> + >> +err_reset: >> + reset_control_assert(res->rst); >> + >> + return ret; >> +} >> + >> +static int qcom_pcie_post_init_2_9_0(struct qcom_pcie *pcie) >> +{ >> + struct dw_pcie *pci = pcie->pci; >> + u16 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP); >> + u32 val; >> + int i; >> + >> + writel(SLV_ADDR_SPACE_SZ, >> + pcie->parf + PCIE20_v3_PARF_SLV_ADDR_SPACE_SIZE); >> + >> + val = readl(pcie->parf + PCIE20_PARF_PHY_CTRL); >> + val &= ~BIT(0); >> + writel(val, pcie->parf + PCIE20_PARF_PHY_CTRL); >> + >> + writel(0, pcie->parf + PCIE20_PARF_DBI_BASE_ADDR); >> + >> + writel(DEVICE_TYPE_RC, pcie->parf + PCIE20_PARF_DEVICE_TYPE); >> + writel(BYPASS | MSTR_AXI_CLK_EN | AHB_CLK_EN, >> + pcie->parf + PCIE20_PARF_MHI_CLOCK_RESET_CTRL); >> + writel(GEN3_RELATED_OFF_RXEQ_RGRDLESS_RXTS >> + | GEN3_RELATED_OFF_GEN3_ZRXDC_NONCOMPL, > > I noticed that some of this probably has been copied from from > qcom_pcie_init_2_3_3(), but please move the | operator to the previous > line. > >> + pci->dbi_base + GEN3_RELATED_OFF); >> + >> + writel(MST_WAKEUP_EN | SLV_WAKEUP_EN | MSTR_ACLK_CGC_DIS >> + | SLV_ACLK_CGC_DIS | CORE_CLK_CGC_DIS | > > Same here. > >> + AUX_PWR_DET | L23_CLK_RMV_DIS | L1_CLK_RMV_DIS, >> + pcie->parf + PCIE20_PARF_SYS_CTRL); >> + >> + writel(0, pcie->parf + PCIE20_PARF_Q2A_FLUSH); >> + >> + dw_pcie_dbi_ro_wr_en(pci); >> + writel(PCIE_CAP_SLOT_VAL, pci->dbi_base + offset + PCI_EXP_SLTCAP); >> + >> + val = readl(pci->dbi_base + offset + PCI_EXP_LNKCAP); >> + val &= ~PCI_EXP_LNKCAP_ASPMS; >> + writel(val, pci->dbi_base + offset + PCI_EXP_LNKCAP); >> + >> + writel(PCI_EXP_DEVCTL2_COMP_TMOUT_DIS, pci->dbi_base + offset + >> + PCI_EXP_DEVCTL2); >> + >> + for (i = 0; i < 256; i++) >> + writel(0x0, pcie->parf + PCIE20_PARF_BDF_TO_SID_TABLE_N >> + + (4 * i)); > > And here for +, but you should probably just remove the line break (you > can go up to 100 chars if it makes the code more readable). > > Please drop the 0x prefix too. > >> + >> + return 0; >> +} > > Johan -- ~. .~ Tk Open Systems =}------------------------------------------------ooO--U--Ooo------------{= - baruch@xxxxxxxxxx - tel: +972.52.368.4656, http://www.tkos.co.il -
