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SubjectRe: [PATCH v9 5/8] PCI: imx6: Refine the regulator usage
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Am Freitag, dem 06.05.2022 um 09:47 +0800 schrieb Richard Zhu:
> The driver should undo any enables it did itself. The regulator disable
> shouldn't be basing decisions on regulator_is_enabled().
>
> To keep the balance of the regulator usage counter, disable the regulator
> just behind of imx6_pcie_assert_core_reset() in resume and shutdown.
>
> Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
> ---
> drivers/pci/controller/dwc/pci-imx6.c | 19 +++++++------------
> 1 file changed, 7 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> index 7005a7910003..3ce3993d5797 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c
> @@ -369,8 +369,6 @@ static int imx6_pcie_attach_pd(struct device *dev)
>
> static void imx6_pcie_assert_core_reset(struct imx6_pcie *imx6_pcie)
> {
> - struct device *dev = imx6_pcie->pci->dev;
> -
> switch (imx6_pcie->drvdata->variant) {
> case IMX7D:
> case IMX8MQ:
> @@ -400,14 +398,6 @@ static void imx6_pcie_assert_core_reset(struct imx6_pcie *imx6_pcie)
> IMX6Q_GPR1_PCIE_REF_CLK_EN, 0 << 16);
> break;
> }
> -
> - if (imx6_pcie->vpcie && regulator_is_enabled(imx6_pcie->vpcie) > 0) {
> - int ret = regulator_disable(imx6_pcie->vpcie);
> -
> - if (ret)
> - dev_err(dev, "failed to disable vpcie regulator: %d\n",
> - ret);
> - }
> }
>
> static unsigned int imx6_pcie_grp_offset(const struct imx6_pcie *imx6_pcie)
> @@ -580,7 +570,7 @@ static int imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie)
> struct device *dev = pci->dev;
> int ret, err;
>
> - if (imx6_pcie->vpcie && !regulator_is_enabled(imx6_pcie->vpcie)) {
> + if (imx6_pcie->vpcie) {
> ret = regulator_enable(imx6_pcie->vpcie);
> if (ret) {
> dev_err(dev, "failed to enable vpcie regulator: %d\n",
> @@ -653,7 +643,7 @@ static int imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie)
> return 0;
>
> err_clks:
> - if (imx6_pcie->vpcie && regulator_is_enabled(imx6_pcie->vpcie) > 0) {
> + if (imx6_pcie->vpcie) {
> ret = regulator_disable(imx6_pcie->vpcie);
> if (ret)
> dev_err(dev, "failed to disable vpcie regulator: %d\n",
> @@ -1026,6 +1016,9 @@ static int imx6_pcie_resume_noirq(struct device *dev)
> return 0;
>
> imx6_pcie_assert_core_reset(imx6_pcie);
> + if (imx6_pcie->vpcie)
> + regulator_disable(imx6_pcie->vpcie);
> +
This one looks misplaced. Surely you want the regulator to be on when
resuming the PCIe subsystem. Isn't this just papering over a wrong
usage count here, because there is no regulator_disable in
imx6_pcie_suspend_noirq, where I would expect this to happen?

Regards,
Lucas

> imx6_pcie_init_phy(imx6_pcie);
> imx6_pcie_deassert_core_reset(imx6_pcie);
> dw_pcie_setup_rc(pp);
> @@ -1259,6 +1252,8 @@ static void imx6_pcie_shutdown(struct platform_device *pdev)
>
> /* bring down link, so bootloader gets clean state in case of reboot */
> imx6_pcie_assert_core_reset(imx6_pcie);
> + if (imx6_pcie->vpcie)
> + regulator_disable(imx6_pcie->vpcie);
> }
>
> static const struct imx6_pcie_drvdata drvdata[] = {


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