[PATCH v6 06/12] PCI: qcom: Use bulk clk api and assert on error

Ansuel Smith
2020-06-10T16:08:07Z

Rework 2.1.0 revision to use bulk clk api and fix missing assert on
reset_control_deassert error.

Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
Reviewed-by: Rob Herring <robh@kernel.org>
---
drivers/pci/controller/dwc/pcie-qcom.c | 131 +++++++++----------------
1 file changed, 46 insertions(+), 85 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 4dab5ef630cc..f2ea1ab6f584 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -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->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->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->aux_clk = devm_clk_get_optional(dev, "aux");
- if (IS_ERR(res->aux_clk))
- return PTR_ERR(res->aux_clk);
+ /* iface, core, phy are required */
+ ret = devm_clk_bulk_get(dev, 3, res->clks);
+ if (ret < 0)
+ return ret;

- 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");
@@ -352,48 +311,46 @@ 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;
}

- /* enable PCIe clocks and resets */
- val = readl(pcie->parf + PCIE20_PARF_PHY_CTRL);
- val &= ~BIT(0);
- writel(val, pcie->parf + PCIE20_PARF_PHY_CTRL);
-
- /* enable external reference clock */
- val = readl(pcie->parf + PCIE20_PARF_PHY_REFCLK);
- 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;
+ goto err_deassert_phy;
}

ret = reset_control_deassert(res->pci_reset);
if (ret) {
dev_err(dev, "cannot deassert pci reset\n");
- return ret;
+ goto err_deassert_pci;
}

ret = reset_control_deassert(res->por_reset);
if (ret) {
dev_err(dev, "cannot deassert por reset\n");
- return ret;
+ goto err_deassert_por;
}

ret = reset_control_deassert(res->axi_reset);
if (ret) {
dev_err(dev, "cannot deassert axi reset\n");
- return ret;
+ goto err_deassert_axi;
}

- ret = clk_prepare_enable(res->phy_clk);
- if (ret) {
- dev_err(dev, "cannot prepare/enable phy clock\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);
+ val &= ~BIT(0);
+ writel(val, pcie->parf + PCIE20_PARF_PHY_CTRL);
+
+ /* enable external reference clock */
+ val = readl(pcie->parf + PCIE20_PARF_PHY_REFCLK);
+ val |= BIT(16);
+ writel(val, pcie->parf + PCIE20_PARF_PHY_REFCLK);

/* 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;
--
2.25.1