Refactors the clock handling logic in the imx6 PCI driver by adding HAS_CLK_* bitmask define for drvdata::flags . Simplifies the code and makes it more maintainable, as future additions of SOC support will only require straightforward changes. The drvdata::flags and a bitmask ensures a cleaner and more scalable switch-case structure for handling clocks. Signed-off-by: Frank Li <Frank.Li@xxxxxxx> --- Notes: Change from v1 to v3 - none drivers/pci/controller/dwc/pci-imx6.c | 84 +++++++++++++-------------- 1 file changed, 42 insertions(+), 42 deletions(-) diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c index 74703362aeec7..8a9b527934f80 100644 --- a/drivers/pci/controller/dwc/pci-imx6.c +++ b/drivers/pci/controller/dwc/pci-imx6.c @@ -60,6 +60,10 @@ enum imx6_pcie_variants { #define IMX6_PCIE_FLAG_IMX6_PHY BIT(0) #define IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE BIT(1) #define IMX6_PCIE_FLAG_SUPPORTS_SUSPEND BIT(2) +#define IMX6_PCIE_FLAG_HAS_CLK_INBOUND_AXI BIT(3) +#define IMX6_PCIE_FLAG_HAS_CLK_AUX BIT(4) + +#define imx6_check_flag(pci, val) (pci->drvdata->flags & val) struct imx6_pcie_drvdata { enum imx6_pcie_variants variant; @@ -550,19 +554,23 @@ static int imx6_pcie_attach_pd(struct device *dev) static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie) { - struct dw_pcie *pci = imx6_pcie->pci; - struct device *dev = pci->dev; unsigned int offset; int ret = 0; - switch (imx6_pcie->drvdata->variant) { - case IMX6SX: + if (imx6_check_flag(imx6_pcie, IMX6_PCIE_FLAG_HAS_CLK_INBOUND_AXI)) { ret = clk_prepare_enable(imx6_pcie->pcie_inbound_axi); - if (ret) { - dev_err(dev, "unable to enable pcie_axi clock\n"); - break; - } + if (ret) + return ret; + } + if (imx6_check_flag(imx6_pcie, IMX6_PCIE_FLAG_HAS_CLK_AUX)) { + ret = clk_prepare_enable(imx6_pcie->pcie_aux); + if (ret) + return ret; + } + + switch (imx6_pcie->drvdata->variant) { + case IMX6SX: regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, IMX6SX_GPR12_PCIE_TEST_POWERDOWN, 0); break; @@ -589,12 +597,6 @@ static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie) case IMX8MQ_EP: case IMX8MP: case IMX8MP_EP: - ret = clk_prepare_enable(imx6_pcie->pcie_aux); - if (ret) { - dev_err(dev, "unable to enable pcie_aux clock\n"); - break; - } - offset = imx6_pcie_grp_offset(imx6_pcie); /* * Set the over ride low and enabled @@ -614,10 +616,13 @@ static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie) static void imx6_pcie_disable_ref_clk(struct imx6_pcie *imx6_pcie) { - switch (imx6_pcie->drvdata->variant) { - case IMX6SX: + if (imx6_check_flag(imx6_pcie, IMX6_PCIE_FLAG_HAS_CLK_INBOUND_AXI)) clk_disable_unprepare(imx6_pcie->pcie_inbound_axi); - break; + + if (imx6_check_flag(imx6_pcie, IMX6_PCIE_FLAG_HAS_CLK_AUX)) + clk_disable_unprepare(imx6_pcie->pcie_aux); + + switch (imx6_pcie->drvdata->variant) { case IMX6QP: case IMX6Q: regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, @@ -631,14 +636,6 @@ static void imx6_pcie_disable_ref_clk(struct imx6_pcie *imx6_pcie) IMX7D_GPR12_PCIE_PHY_REFCLK_SEL, IMX7D_GPR12_PCIE_PHY_REFCLK_SEL); break; - case IMX8MM: - case IMX8MM_EP: - case IMX8MQ: - case IMX8MQ_EP: - case IMX8MP: - case IMX8MP_EP: - clk_disable_unprepare(imx6_pcie->pcie_aux); - break; default: break; } @@ -1316,21 +1313,21 @@ static int imx6_pcie_probe(struct platform_device *pdev) return dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie), "pcie clock source missing or invalid\n"); - switch (imx6_pcie->drvdata->variant) { - case IMX6SX: - imx6_pcie->pcie_inbound_axi = devm_clk_get(dev, - "pcie_inbound_axi"); + if (imx6_check_flag(imx6_pcie, IMX6_PCIE_FLAG_HAS_CLK_INBOUND_AXI)) { + imx6_pcie->pcie_inbound_axi = devm_clk_get(dev, "pcie_inbound_axi"); if (IS_ERR(imx6_pcie->pcie_inbound_axi)) - return dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie_inbound_axi), - "pcie_inbound_axi clock missing or invalid\n"); - break; - case IMX8MQ: - case IMX8MQ_EP: + dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie_inbound_axi), + "pcie_inbound_axi clock missing or invalid\n"); + } + + if (imx6_check_flag(imx6_pcie, IMX6_PCIE_FLAG_HAS_CLK_AUX)) { imx6_pcie->pcie_aux = devm_clk_get(dev, "pcie_aux"); if (IS_ERR(imx6_pcie->pcie_aux)) return dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie_aux), "pcie_aux clock source missing or invalid\n"); - fallthrough; + } + + switch (imx6_pcie->drvdata->variant) { case IMX7D: if (dbi_base->start == IMX8MQ_PCIE2_BASE_ADDR) imx6_pcie->controller_id = 1; @@ -1353,10 +1350,6 @@ static int imx6_pcie_probe(struct platform_device *pdev) case IMX8MM_EP: case IMX8MP: case IMX8MP_EP: - imx6_pcie->pcie_aux = devm_clk_get(dev, "pcie_aux"); - if (IS_ERR(imx6_pcie->pcie_aux)) - return dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie_aux), - "pcie_aux clock source missing or invalid\n"); imx6_pcie->apps_reset = devm_reset_control_get_exclusive(dev, "apps"); if (IS_ERR(imx6_pcie->apps_reset)) @@ -1482,7 +1475,8 @@ static const struct imx6_pcie_drvdata drvdata[] = { .variant = IMX6SX, .flags = IMX6_PCIE_FLAG_IMX6_PHY | IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE | - IMX6_PCIE_FLAG_SUPPORTS_SUSPEND, + IMX6_PCIE_FLAG_SUPPORTS_SUSPEND | + IMX6_PCIE_FLAG_HAS_CLK_INBOUND_AXI, .gpr = "fsl,imx6q-iomuxc-gpr", }, [IMX6QP] = { @@ -1500,30 +1494,36 @@ static const struct imx6_pcie_drvdata drvdata[] = { }, [IMX8MQ] = { .variant = IMX8MQ, + .flags = IMX6_PCIE_FLAG_HAS_CLK_AUX, .gpr = "fsl,imx8mq-iomuxc-gpr", }, [IMX8MM] = { .variant = IMX8MM, - .flags = IMX6_PCIE_FLAG_SUPPORTS_SUSPEND, + .flags = IMX6_PCIE_FLAG_SUPPORTS_SUSPEND | + IMX6_PCIE_FLAG_HAS_CLK_AUX, .gpr = "fsl,imx8mm-iomuxc-gpr", }, [IMX8MP] = { .variant = IMX8MP, - .flags = IMX6_PCIE_FLAG_SUPPORTS_SUSPEND, + .flags = IMX6_PCIE_FLAG_SUPPORTS_SUSPEND | + IMX6_PCIE_FLAG_HAS_CLK_AUX, .gpr = "fsl,imx8mp-iomuxc-gpr", }, [IMX8MQ_EP] = { .variant = IMX8MQ_EP, + .flags = IMX6_PCIE_FLAG_HAS_CLK_AUX, .mode = DW_PCIE_EP_TYPE, .gpr = "fsl,imx8mq-iomuxc-gpr", }, [IMX8MM_EP] = { .variant = IMX8MM_EP, + .flags = IMX6_PCIE_FLAG_HAS_CLK_AUX, .mode = DW_PCIE_EP_TYPE, .gpr = "fsl,imx8mm-iomuxc-gpr", }, [IMX8MP_EP] = { .variant = IMX8MP_EP, + .flags = IMX6_PCIE_FLAG_HAS_CLK_AUX, .mode = DW_PCIE_EP_TYPE, .gpr = "fsl,imx8mp-iomuxc-gpr", }, -- 2.34.1