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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 <ansuelsmth@gmail.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Stanimir Varbanov <svarbanov@mm-sol.com>
This commit is contained in:
Ansuel Smith 2020-06-15 23:06:02 +02:00 committed by Lorenzo Pieralisi
parent b11b8cc161
commit 6a114526af
1 changed files with 57 additions and 96 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

153
drivers/pci/controller/dwc/pcie-qcom.c
View File

@ -84,12 +84,9 @@
#define DEVICE_TYPE_RC 0x4
#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;
@ -237,25 +234,21 @@ static int qcom_pcie_get_resources_2_1_0(struct qcom_pcie *pcie)
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->clks[0].id = "iface";
res->clks[1].id = "core";
res->clks[2].id = "phy";
res->clks[3].id = "aux";
res->clks[4].id = "ref";
res->core_clk = devm_clk_get(dev, "core");
if (IS_ERR(res->core_clk))
return PTR_ERR(res->core_clk);
/* iface, core, phy are required */
ret = devm_clk_bulk_get(dev, 3, res->clks);
if (ret < 0)
return ret;
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);
/* 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))
@ -285,17 +278,13 @@ static void qcom_pcie_deinit_2_1_0(struct qcom_pcie *pcie)
{
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);
regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies);
}
@ -313,36 +302,6 @@ static int qcom_pcie_init_2_1_0(struct qcom_pcie *pcie)
return ret;
}
ret = reset_control_assert(res->ahb_reset);
if (ret) {
dev_err(dev, "cannot assert ahb reset\n");
goto err_assert_ahb;
}
ret = clk_prepare_enable(res->iface_clk);
if (ret) {
dev_err(dev, "cannot prepare/enable iface clock\n");
goto err_assert_ahb;
}
ret = clk_prepare_enable(res->core_clk);
if (ret) {
dev_err(dev, "cannot prepare/enable core clock\n");
goto err_clk_core;
}
ret = clk_prepare_enable(res->aux_clk);
if (ret) {
dev_err(dev, "cannot prepare/enable aux clock\n");
goto err_clk_aux;
}
ret = clk_prepare_enable(res->ref_clk);
if (ret) {
dev_err(dev, "cannot prepare/enable ref clock\n");
goto err_clk_ref;
}
ret = reset_control_deassert(res->ahb_reset);
if (ret) {
dev_err(dev, "cannot deassert ahb reset\n");
@ -352,9 +311,37 @@ static int qcom_pcie_init_2_1_0(struct qcom_pcie *pcie)
ret = reset_control_deassert(res->ext_reset);
if (ret) {
dev_err(dev, "cannot deassert ext reset\n");
goto err_deassert_ahb;
goto err_deassert_ext;
}
ret = reset_control_deassert(res->phy_reset);
if (ret) {
dev_err(dev, "cannot deassert phy reset\n");
goto err_deassert_phy;
}
ret = reset_control_deassert(res->pci_reset);
if (ret) {
dev_err(dev, "cannot deassert pci reset\n");
goto err_deassert_pci;
}
ret = reset_control_deassert(res->por_reset);
if (ret) {
dev_err(dev, "cannot deassert por reset\n");
goto err_deassert_por;
}
ret = reset_control_deassert(res->axi_reset);
if (ret) {
dev_err(dev, "cannot deassert axi reset\n");
goto err_deassert_axi;
}
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);
val &= ~BIT(0);
@ -365,36 +352,6 @@ static int qcom_pcie_init_2_1_0(struct qcom_pcie *pcie)
val |= BIT(16);
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);
@ -407,15 +364,19 @@ static int qcom_pcie_init_2_1_0(struct qcom_pcie *pcie)
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;