From 6a114526af4689938863bf34976c83bfd279f517 Mon Sep 17 00:00:00 2001 From: Ansuel Smith Date: Mon, 15 Jun 2020 23:06:02 +0200 Subject: PCI: qcom: Use bulk clk api and assert on error Rework 2.1.0 revision to use bulk clk api and fix missing assert on reset_control_deassert error. Link: https://lore.kernel.org/r/20200615210608.21469-7-ansuelsmth@gmail.com Signed-off-by: Ansuel Smith Signed-off-by: Lorenzo Pieralisi Reviewed-by: Rob Herring Acked-by: Stanimir Varbanov --- drivers/pci/controller/dwc/pcie-qcom.c | 131 ++++++++++++--------------------- 1 file changed, 46 insertions(+), 85 deletions(-) --- a/drivers/pci/controller/dwc/pcie-qcom.c +++ b/drivers/pci/controller/dwc/pcie-qcom.c @@ -99,12 +99,9 @@ #define SLV_ADDR_SPACE_SZ 0x10000000 #define QCOM_PCIE_2_1_0_MAX_SUPPLY 3 +#define QCOM_PCIE_2_1_0_MAX_CLOCKS 5 struct qcom_pcie_resources_2_1_0 { - struct clk *iface_clk; - struct clk *core_clk; - struct clk *phy_clk; - struct clk *aux_clk; - struct clk *ref_clk; + struct clk_bulk_data clks[QCOM_PCIE_2_1_0_MAX_CLOCKS]; struct reset_control *pci_reset; struct reset_control *axi_reset; struct reset_control *ahb_reset; @@ -244,25 +241,21 @@ static int qcom_pcie_get_resources_2_1_0 if (ret) return ret; - res->iface_clk = devm_clk_get(dev, "iface"); - if (IS_ERR(res->iface_clk)) - return PTR_ERR(res->iface_clk); - - res->core_clk = devm_clk_get(dev, "core"); - if (IS_ERR(res->core_clk)) - return PTR_ERR(res->core_clk); - - res->phy_clk = devm_clk_get(dev, "phy"); - if (IS_ERR(res->phy_clk)) - return PTR_ERR(res->phy_clk); - - res->aux_clk = devm_clk_get_optional(dev, "aux"); - if (IS_ERR(res->aux_clk)) - return PTR_ERR(res->aux_clk); - - res->ref_clk = devm_clk_get_optional(dev, "ref"); - if (IS_ERR(res->ref_clk)) - return PTR_ERR(res->ref_clk); + res->clks[0].id = "iface"; + res->clks[1].id = "core"; + res->clks[2].id = "phy"; + res->clks[3].id = "aux"; + res->clks[4].id = "ref"; + + /* iface, core, phy are required */ + ret = devm_clk_bulk_get(dev, 3, res->clks); + if (ret < 0) + return ret; + + /* aux, ref are optional */ + ret = devm_clk_bulk_get_optional(dev, 2, res->clks + 3); + if (ret < 0) + return ret; res->pci_reset = devm_reset_control_get_exclusive(dev, "pci"); if (IS_ERR(res->pci_reset)) @@ -292,17 +285,13 @@ static void qcom_pcie_deinit_2_1_0(struc { struct qcom_pcie_resources_2_1_0 *res = &pcie->res.v2_1_0; - clk_disable_unprepare(res->phy_clk); + clk_bulk_disable_unprepare(ARRAY_SIZE(res->clks), res->clks); reset_control_assert(res->pci_reset); reset_control_assert(res->axi_reset); reset_control_assert(res->ahb_reset); reset_control_assert(res->por_reset); reset_control_assert(res->ext_reset); reset_control_assert(res->phy_reset); - clk_disable_unprepare(res->iface_clk); - clk_disable_unprepare(res->core_clk); - clk_disable_unprepare(res->aux_clk); - clk_disable_unprepare(res->ref_clk); writel(1, pcie->parf + PCIE20_PARF_PHY_CTRL); @@ -334,47 +323,45 @@ static int qcom_pcie_init_2_1_0(struct q return ret; } - ret = reset_control_assert(res->ahb_reset); + ret = reset_control_deassert(res->ahb_reset); if (ret) { - dev_err(dev, "cannot assert ahb reset\n"); - goto err_assert_ahb; + dev_err(dev, "cannot deassert ahb reset\n"); + goto err_deassert_ahb; } - ret = clk_prepare_enable(res->iface_clk); + ret = reset_control_deassert(res->ext_reset); if (ret) { - dev_err(dev, "cannot prepare/enable iface clock\n"); - goto err_assert_ahb; + dev_err(dev, "cannot deassert ext reset\n"); + goto err_deassert_ext; } - ret = clk_prepare_enable(res->core_clk); + ret = reset_control_deassert(res->phy_reset); if (ret) { - dev_err(dev, "cannot prepare/enable core clock\n"); - goto err_clk_core; + dev_err(dev, "cannot deassert phy reset\n"); + goto err_deassert_phy; } - ret = clk_prepare_enable(res->aux_clk); + ret = reset_control_deassert(res->pci_reset); if (ret) { - dev_err(dev, "cannot prepare/enable aux clock\n"); - goto err_clk_aux; + dev_err(dev, "cannot deassert pci reset\n"); + goto err_deassert_pci; } - ret = clk_prepare_enable(res->ref_clk); + ret = reset_control_deassert(res->por_reset); if (ret) { - dev_err(dev, "cannot prepare/enable ref clock\n"); - goto err_clk_ref; + dev_err(dev, "cannot deassert por reset\n"); + goto err_deassert_por; } - ret = reset_control_deassert(res->ahb_reset); + ret = reset_control_deassert(res->axi_reset); if (ret) { - dev_err(dev, "cannot deassert ahb reset\n"); - goto err_deassert_ahb; + dev_err(dev, "cannot deassert axi reset\n"); + goto err_deassert_axi; } - ret = reset_control_deassert(res->ext_reset); - if (ret) { - dev_err(dev, "cannot deassert ext reset\n"); - goto err_deassert_ahb; - } + ret = clk_bulk_prepare_enable(ARRAY_SIZE(res->clks), res->clks); + if (ret) + goto err_clks; /* enable PCIe clocks and resets */ val = readl(pcie->parf + PCIE20_PARF_PHY_CTRL); @@ -408,36 +395,6 @@ static int qcom_pcie_init_2_1_0(struct q val |= PHY_REFCLK_SSP_EN; writel(val, pcie->parf + PCIE20_PARF_PHY_REFCLK); - ret = reset_control_deassert(res->phy_reset); - if (ret) { - dev_err(dev, "cannot deassert phy reset\n"); - return ret; - } - - ret = reset_control_deassert(res->pci_reset); - if (ret) { - dev_err(dev, "cannot deassert pci reset\n"); - return ret; - } - - ret = reset_control_deassert(res->por_reset); - if (ret) { - dev_err(dev, "cannot deassert por reset\n"); - return ret; - } - - ret = reset_control_deassert(res->axi_reset); - if (ret) { - dev_err(dev, "cannot deassert axi reset\n"); - return ret; - } - - ret = clk_prepare_enable(res->phy_clk); - if (ret) { - dev_err(dev, "cannot prepare/enable phy clock\n"); - goto err_deassert_ahb; - } - /* wait for clock acquisition */ usleep_range(1000, 1500); @@ -450,15 +407,19 @@ static int qcom_pcie_init_2_1_0(struct q return 0; +err_clks: + reset_control_assert(res->axi_reset); +err_deassert_axi: + reset_control_assert(res->por_reset); +err_deassert_por: + reset_control_assert(res->pci_reset); +err_deassert_pci: + reset_control_assert(res->phy_reset); +err_deassert_phy: + reset_control_assert(res->ext_reset); +err_deassert_ext: + reset_control_assert(res->ahb_reset); err_deassert_ahb: - clk_disable_unprepare(res->ref_clk); -err_clk_ref: - clk_disable_unprepare(res->aux_clk); -err_clk_aux: - clk_disable_unprepare(res->core_clk); -err_clk_core: - clk_disable_unprepare(res->iface_clk); -err_assert_ahb: regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies); return ret;