Hi,
On 02/05/2023 11:18, Minda Chen wrote:
> Add gereric clk and reset init codes to Cadence USBSS
> controller. The codes has been tested by starfive vf2
> board.
>
> Signed-off-by: Minda Chen <minda.chen@xxxxxxxxxxxxxxxx>
> ---
> drivers/usb/cdns3/cdns3-plat.c | 52 ++++++++++++++++++++++++++++++++++
> drivers/usb/cdns3/core.h | 3 ++
> 2 files changed, 55 insertions(+)
>
> diff --git a/drivers/usb/cdns3/cdns3-plat.c b/drivers/usb/cdns3/cdns3-plat.c
> index 2bc5d094548b..1820844c74d2 100644
> --- a/drivers/usb/cdns3/cdns3-plat.c
> +++ b/drivers/usb/cdns3/cdns3-plat.c
> @@ -12,11 +12,13 @@
> * Roger Quadros <rogerq@xxxxxx>
> */
>
> +#include <linux/clk.h>
> #include <linux/module.h>
> #include <linux/irq.h>
> #include <linux/kernel.h>
> #include <linux/platform_device.h>
> #include <linux/pm_runtime.h>
> +#include <linux/reset.h>
>
> #include "core.h"
> #include "gadget-export.h"
> @@ -43,6 +45,34 @@ static void set_phy_power_off(struct cdns *cdns)
> phy_power_off(cdns->usb2_phy);
> }
>
> +static int cdns3_clk_rst_init(struct cdns *cdns)
> +{
> + int ret;
> +
> + if (cdns->num_clks) {
> + ret = clk_bulk_prepare_enable(cdns->num_clks, cdns->clks);
> + if (ret)
> + return ret;
> + }
> +
> + ret = reset_control_deassert(cdns->resets);
> + if (ret && cdns->num_clks)
> + goto err_clk_init;
if (ret)
goto err_clk_init;
> +
> + return ret;
> +
> +err_clk_init:
> + clk_bulk_disable_unprepare(cdns->num_clks, cdns->clks);
if (cdns->num_clks)
clk_bulk_disable_unprepare(cdns->num_clks, cdns->clks);
This way is more nicer I think.
> + return ret;
> +}
> +
> +static void cdns3_clk_rst_deinit(struct cdns *cdns)
> +{
> + reset_control_assert(cdns->resets);
> + if (cdns->num_clks)
> + clk_bulk_disable_unprepare(cdns->num_clks, cdns->clks);
> +}
> +
> /**
> * cdns3_plat_probe - probe for cdns3 core device
> * @pdev: Pointer to cdns3 core platform device
> @@ -116,6 +146,16 @@ static int cdns3_plat_probe(struct platform_device *pdev)
> cdns->wakeup_irq = 0x0;
> }
>
> + ret = devm_clk_bulk_get_all(dev, &cdns->clks);
> + if (ret < 0)
> + return ret;
> +
> + cdns->num_clks = ret;
> +
> + cdns->resets = devm_reset_control_array_get_optional_exclusive(dev);
> + if (IS_ERR(cdns->resets))
> + return PTR_ERR(cdns->resets);
> +
> cdns->usb2_phy = devm_phy_optional_get(dev, "cdns3,usb2-phy");
> if (IS_ERR(cdns->usb2_phy))
> return PTR_ERR(cdns->usb2_phy);
> @@ -128,6 +168,10 @@ static int cdns3_plat_probe(struct platform_device *pdev)
> if (IS_ERR(cdns->usb3_phy))
> return PTR_ERR(cdns->usb3_phy);
>
> + ret = cdns3_clk_rst_init(cdns);
> + if (ret)
> + return ret;
> +
> ret = phy_init(cdns->usb3_phy);
> if (ret)
> goto err_phy3_init;
> @@ -165,6 +209,7 @@ static int cdns3_plat_probe(struct platform_device *pdev)
> phy_exit(cdns->usb3_phy);
> err_phy3_init:
> phy_exit(cdns->usb2_phy);
> + cdns3_clk_rst_deinit(cdns);
>
> return ret;
> }
> @@ -187,6 +232,8 @@ static int cdns3_plat_remove(struct platform_device *pdev)
> set_phy_power_off(cdns);
> phy_exit(cdns->usb2_phy);
> phy_exit(cdns->usb3_phy);
> + cdns3_clk_rst_deinit(cdns);
> +
> return 0;
> }
>
> @@ -220,6 +267,8 @@ static int cdns3_controller_suspend(struct device *dev, pm_message_t msg)
>
> cdns3_set_platform_suspend(cdns->dev, true, wakeup);
> set_phy_power_off(cdns);
> + if (!PMSG_IS_AUTO(msg))
> + cdns3_clk_rst_deinit(cdns);
If you reset the controller here all state will be lost.
How is it expected to work on system resume?
> spin_lock_irqsave(&cdns->lock, flags);
> cdns->in_lpm = true;
> spin_unlock_irqrestore(&cdns->lock, flags);
> @@ -237,6 +286,9 @@ static int cdns3_controller_resume(struct device *dev, pm_message_t msg)
> if (!cdns->in_lpm)
> return 0;
>
> + if (!PMSG_IS_AUTO(msg))
> + cdns3_clk_rst_init(cdns);
> +
> if (cdns_power_is_lost(cdns)) {
> phy_exit(cdns->usb2_phy);
> ret = phy_init(cdns->usb2_phy);
> diff --git a/drivers/usb/cdns3/core.h b/drivers/usb/cdns3/core.h
> index 2d332a788871..b894768ee485 100644
> --- a/drivers/usb/cdns3/core.h
> +++ b/drivers/usb/cdns3/core.h
> @@ -111,6 +111,9 @@ struct cdns {
> struct mutex mutex;
> enum usb_dr_mode dr_mode;
> struct usb_role_switch *role_sw;
> + struct reset_control *resets;
> + struct clk_bulk_data *clks;
> + int num_clks;
> bool in_lpm;
> bool wakeup_pending;
> struct cdns3_platform_data *pdata;
cheers,
-roger
