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SubjectRe: [PATCH v2 3/4] PCI: imx: Add multi-pd support
On Mon, Oct 08, 2018 at 06:06:21PM +0000, Leonard Crestez wrote:
> On some chips the PCIE and PCIE_PHY blocks are in separate power domains
> which can be power-gated independently. The pci driver needs to handle
> this by keeping both domain active.
>
> This is intended for imx6sx where PCIE is in DISPLAY and PCIE_PHY in
> it's own domain. Defining the DISPLAY domain requires a way for pcie to
> keep it active or it will break when displays are off.
>
> The power-domains on imx6sx are meant to look like this:
> power-domains = <&pd_disp>, <&pd_pci>;
> power-domain-names = "pcie", "pcie_phy";
>
> Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
> ---
> drivers/pci/controller/dwc/pci-imx6.c | 48 +++++++++++++++++++++++++++
> 1 file changed, 48 insertions(+)

I expect Shawn to pick the whole series up and therefore I am dropping
this series from the PCI tree.

Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>

> diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> index 6171171db1fc..a482f86b02e6 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c
> @@ -25,10 +25,12 @@
> #include <linux/resource.h>
> #include <linux/signal.h>
> #include <linux/types.h>
> #include <linux/interrupt.h>
> #include <linux/reset.h>
> +#include <linux/pm_domain.h>
> +#include <linux/pm_runtime.h>
>
> #include "pcie-designware.h"
>
> #define to_imx6_pcie(x) dev_get_drvdata((x)->dev)
>
> @@ -57,10 +59,15 @@ struct imx6_pcie {
> u32 tx_deemph_gen2_6db;
> u32 tx_swing_full;
> u32 tx_swing_low;
> int link_gen;
> struct regulator *vpcie;
> +
> + /* power domain for pcie */
> + struct device *pd_pcie;
> + /* power domain for pcie phy */
> + struct device *pd_pcie_phy;
> };
>
> /* Parameters for the waiting for PCIe PHY PLL to lock on i.MX7 */
> #define PHY_PLL_LOCK_WAIT_MAX_RETRIES 2000
> #define PHY_PLL_LOCK_WAIT_USLEEP_MIN 50
> @@ -290,10 +297,47 @@ static int imx6q_pcie_abort_handler(unsigned long addr,
> }
>
> return 1;
> }
>
> +static int imx6_pcie_attach_pd(struct device *dev)
> +{
> + struct imx6_pcie *imx6_pcie = dev_get_drvdata(dev);
> + struct device_link *link;
> +
> + /* Do nothing when in a single power domain */
> + if (dev->pm_domain)
> + return 0;
> +
> + imx6_pcie->pd_pcie = dev_pm_domain_attach_by_name(dev, "pcie");
> + if (IS_ERR(imx6_pcie->pd_pcie))
> + return PTR_ERR(imx6_pcie->pd_pcie);
> + link = device_link_add(dev, imx6_pcie->pd_pcie,
> + DL_FLAG_STATELESS |
> + DL_FLAG_PM_RUNTIME |
> + DL_FLAG_RPM_ACTIVE);
> + if (IS_ERR(link)) {
> + dev_err(dev, "Failed to add device_link to pcie pd: %ld\n", PTR_ERR(link));
> + return PTR_ERR(link);
> + }
> +
> + imx6_pcie->pd_pcie_phy = dev_pm_domain_attach_by_name(dev, "pcie_phy");
> + if (IS_ERR(imx6_pcie->pd_pcie_phy))
> + return PTR_ERR(imx6_pcie->pd_pcie_phy);
> +
> + device_link_add(dev, imx6_pcie->pd_pcie_phy,
> + DL_FLAG_STATELESS |
> + DL_FLAG_PM_RUNTIME |
> + DL_FLAG_RPM_ACTIVE);
> + if (IS_ERR(link)) {
> + dev_err(dev, "Failed to add device_link to pcie_phy pd: %ld\n", PTR_ERR(link));
> + return PTR_ERR(link);
> + }
> +
> + return 0;
> +}
> +
> static void imx6_pcie_assert_core_reset(struct imx6_pcie *imx6_pcie)
> {
> struct device *dev = imx6_pcie->pci->dev;
>
> switch (imx6_pcie->variant) {
> @@ -1013,10 +1057,14 @@ static int imx6_pcie_probe(struct platform_device *pdev)
> imx6_pcie->vpcie = NULL;
> }
>
> platform_set_drvdata(pdev, imx6_pcie);
>
> + ret = imx6_pcie_attach_pd(dev);
> + if (ret)
> + return ret;
> +
> ret = imx6_add_pcie_port(imx6_pcie, pdev);
> if (ret < 0)
> return ret;
>
> return 0;
> --
> 2.17.1
>

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