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SubjectRe: [PATCH v2] PCI: qcom: add runtime pm support to pcie_port
On Wed, May 23, 2018 at 11:44:25AM +0100, Srinivas Kandagatla wrote:
> This patch is required when the pcie controller sits on a bus with
> its own power domain and clocks which are controlled via a bus driver
> like simple pm bus. As these bus driver have runtime pm enabled, it makes
> sense to update the usage counter so that the runtime pm does not suspend
> the clks or power domain associated with the bus driver.
>
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> ---
> drivers/pci/dwc/pcie-qcom.c | 9 ++++++++-
> 1 file changed, 8 insertions(+), 1 deletion(-)

Applied to pci/dwc for v4.18, thanks.

Lorenzo

> diff --git a/drivers/pci/dwc/pcie-qcom.c b/drivers/pci/dwc/pcie-qcom.c
> index 5897af7d3355..d6ed5aeeae9c 100644
> --- a/drivers/pci/dwc/pcie-qcom.c
> +++ b/drivers/pci/dwc/pcie-qcom.c
> @@ -19,6 +19,7 @@
> #include <linux/of_device.h>
> #include <linux/of_gpio.h>
> #include <linux/pci.h>
> +#include <linux/pm_runtime.h>
> #include <linux/platform_device.h>
> #include <linux/phy/phy.h>
> #include <linux/regulator/consumer.h>
> @@ -1088,6 +1089,7 @@ static int qcom_pcie_host_init(struct pcie_port *pp)
> struct qcom_pcie *pcie = to_qcom_pcie(pci);
> int ret;
>
> + pm_runtime_get_sync(pci->dev);
> qcom_ep_reset_assert(pcie);
>
> ret = pcie->ops->init(pcie);
> @@ -1124,6 +1126,7 @@ static int qcom_pcie_host_init(struct pcie_port *pp)
> phy_power_off(pcie->phy);
> err_deinit:
> pcie->ops->deinit(pcie);
> + pm_runtime_put(pci->dev);
>
> return ret;
> }
> @@ -1212,6 +1215,7 @@ static int qcom_pcie_probe(struct platform_device *pdev)
> if (!pci)
> return -ENOMEM;
>
> + pm_runtime_enable(dev);
> pci->dev = dev;
> pci->ops = &dw_pcie_ops;
> pp = &pci->pp;
> @@ -1257,14 +1261,17 @@ static int qcom_pcie_probe(struct platform_device *pdev)
> }
>
> ret = phy_init(pcie->phy);
> - if (ret)
> + if (ret) {
> + pm_runtime_disable(&pdev->dev);
> return ret;
> + }
>
> platform_set_drvdata(pdev, pcie);
>
> ret = dw_pcie_host_init(pp);
> if (ret) {
> dev_err(dev, "cannot initialize host\n");
> + pm_runtime_disable(&pdev->dev);
> return ret;
> }
>
> --
> 2.16.2
>

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