Hi,
On 10/24/2017 3:27 AM, Martin Blumenstingl wrote:
> This integrates the PHY roothub wrapper into the core hcd
> infrastructure. Multiple PHYs which are part of the roothub devicetree
> node (which is a sub-node of the sysdev's node) are now managed
> (= powered on/off when needed), by the new usb_phy_roothub code.
>
> One example where this is required is the Amlogic GXL and GXM SoCs:
> They are using a dwc3 USB controller with up to three ports enabled on
> the internal roothub. Using only the top-level "phy" properties does not
> work here since one can only specify one "usb2-phy" and one "usb3-phy",
> while actually at least two "usb2-phy" have to be specified.
>
> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>
> Tested-by: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
> Acked-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
> ---
> drivers/usb/core/hcd.c | 26 ++++++++++++++++++++++++++
> include/linux/usb/hcd.h | 1 +
> 2 files changed, 27 insertions(+)
>
> diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
> index 67aa3d039b9b..6ee97222cdad 100644
> --- a/drivers/usb/core/hcd.c
> +++ b/drivers/usb/core/hcd.c
> @@ -50,6 +50,7 @@
> #include <linux/usb/otg.h>
>
> #include "usb.h"
> +#include "phy.h"
>
>
> /*-------------------------------------------------------------------------*/
> @@ -2271,6 +2272,8 @@ int hcd_bus_suspend(struct usb_device *rhdev, pm_message_t msg)
> usb_set_device_state(rhdev, USB_STATE_SUSPENDED);
> hcd->state = HC_STATE_SUSPENDED;
>
> + usb_phy_roothub_power_off(hcd->phy_roothub);
> +
For system-suspend it should be ok.
But, in case of runtime/auto suspend, I think PHYs shouldn't be powered off.
Should we have check for that like-
if (!PMSG_IS_AUTO(msg))
usb_phy_roothub_power_off()
Similar check in hcd_bus_resume?
> /* Did we race with a root-hub wakeup event? */
> if (rhdev->do_remote_wakeup) {
> char buffer[6];
> @@ -2307,6 +2310,11 @@ int hcd_bus_resume(struct usb_device *rhdev, pm_message_t msg)
> dev_dbg(&rhdev->dev, "skipped %s of dead bus\n", "resume");
> return 0;
> }
> +
> + status = usb_phy_roothub_power_on(hcd->phy_roothub);
> + if (status)
> + return status;
> +
--
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