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Date: Thu, 2 Jun 2022 18:37:17 +0530
From: Pavan Kondeti <quic_pkondeti@...cinc.com>
To: Krishna Kurapati <quic_kriskura@...cinc.com>
CC: Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
Andy Gross <agross@...nel.org>,
Bjorn Andersson <bjorn.andersson@...aro.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Felipe Balbi <balbi@...nel.org>,
Stephen Boyd <swboyd@...omium.org>,
Doug Anderson <dianders@...omium.org>,
"Matthias Kaehlcke" <mka@...omium.org>,
Mathias Nyman <mathias.nyman@...el.com>,
<devicetree@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-pm@...r.kernel.org>, <quic_pkondeti@...cinc.com>,
<quic_ppratap@...cinc.com>, <quic_vpulyala@...cinc.com>,
Sandeep Maheswaram <quic_c_sanm@...cinc.com>
Subject: Re: [PATCH v20 4/5] usb: dwc3: qcom: Configure wakeup interrupts
during suspend
On Thu, Jun 02, 2022 at 01:54:36PM +0530, Krishna Kurapati wrote:
> From: Sandeep Maheswaram <quic_c_sanm@...cinc.com>
>
> Configure DP/DM line interrupts based on the USB2 device attached to
> the root hub port. When HS/FS device is connected, configure the DP line
> as falling edge to detect both disconnect and remote wakeup scenarios. When
> LS device is connected, configure DM line as falling edge to detect both
> disconnect and remote wakeup. When no device is connected, configure both
> DP and DM lines as rising edge to detect HS/HS/LS device connect scenario.
>
> Signed-off-by: Sandeep Maheswaram <quic_c_sanm@...cinc.com>
> Signed-off-by: Krishna Kurapati <quic_kriskura@...cinc.com>
> ---
> drivers/usb/dwc3/dwc3-qcom.c | 72 ++++++++++++++++++++++++++++++++++++++------
> 1 file changed, 62 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
> index 7352124..9395d79 100644
> --- a/drivers/usb/dwc3/dwc3-qcom.c
> +++ b/drivers/usb/dwc3/dwc3-qcom.c
> @@ -20,7 +20,8 @@
> #include <linux/usb/of.h>
> #include <linux/reset.h>
> #include <linux/iopoll.h>
> -
> +#include <linux/usb/hcd.h>
> +#include <linux/usb.h>
> #include "core.h"
>
> /* USB QSCRATCH Hardware registers */
> @@ -76,6 +77,7 @@ struct dwc3_qcom {
> int dp_hs_phy_irq;
> int dm_hs_phy_irq;
> int ss_phy_irq;
> + enum usb_device_speed usb2_speed;
>
> struct extcon_dev *edev;
> struct extcon_dev *host_edev;
> @@ -296,11 +298,34 @@ static void dwc3_qcom_interconnect_exit(struct dwc3_qcom *qcom)
> icc_put(qcom->icc_path_apps);
> }
>
> -static void dwc3_qcom_enable_wakeup_irq(int irq)
> +enum usb_device_speed dwc3_qcom_read_usb2_speed(struct dwc3_qcom *qcom)
> +{
> + struct dwc3 *dwc = platform_get_drvdata(qcom->dwc3);
> + struct usb_hcd *hcd = platform_get_drvdata(dwc->xhci);
> + struct usb_device *udev;
> +
> + /*
> + * It is possible to query the speed of all children of
> + * USB2.0 root hub via usb_hub_for_each_child(). DWC3 code
> + * currently supports only 1 port per controller. So
> + * this is sufficient.
> + */
> + udev = usb_hub_find_child(hcd->self.root_hub, 1);
> +
> + if (!udev)
> + return USB_SPEED_UNKNOWN;
> +
> + return udev->speed;
> +}
> +
> +static void dwc3_qcom_enable_wakeup_irq(int irq, unsigned int polarity)
> {
> if (!irq)
> return;
>
> + if (polarity)
> + irq_set_irq_type(irq, polarity);
> +
> enable_irq(irq);
> enable_irq_wake(irq);
> }
> @@ -318,22 +343,47 @@ static void dwc3_qcom_disable_interrupts(struct dwc3_qcom *qcom)
> {
> dwc3_qcom_disable_wakeup_irq(qcom->hs_phy_irq);
>
> - dwc3_qcom_disable_wakeup_irq(qcom->dp_hs_phy_irq);
> -
> - dwc3_qcom_disable_wakeup_irq(qcom->dm_hs_phy_irq);
> + if (qcom->usb2_speed == USB_SPEED_LOW) {
> + dwc3_qcom_disable_wakeup_irq(qcom->dm_hs_phy_irq);
> + } else if ((qcom->usb2_speed == USB_SPEED_HIGH) ||
> + (qcom->usb2_speed == USB_SPEED_FULL)) {
> + dwc3_qcom_disable_wakeup_irq(qcom->dp_hs_phy_irq);
> + } else {
> + dwc3_qcom_disable_wakeup_irq(qcom->dp_hs_phy_irq);
> + dwc3_qcom_disable_wakeup_irq(qcom->dm_hs_phy_irq);
> + }
>
> dwc3_qcom_disable_wakeup_irq(qcom->ss_phy_irq);
> }
>
> static void dwc3_qcom_enable_interrupts(struct dwc3_qcom *qcom)
> {
> - dwc3_qcom_enable_wakeup_irq(qcom->hs_phy_irq);
> + dwc3_qcom_enable_wakeup_irq(qcom->hs_phy_irq, 0);
>
> - dwc3_qcom_enable_wakeup_irq(qcom->dp_hs_phy_irq);
> + /*
> + * Configure DP/DM line interrupts based on the USB2 device attached to
> + * the root hub port. When HS/FS device is connected, configure the DP line
> + * as falling edge to detect both disconnect and remote wakeup scenarios. When
> + * LS device is connected, configure DM line as falling edge to detect both
> + * disconnect and remote wakeup. When no device is connected, configure both
> + * DP and DM lines as rising edge to detect HS/HS/LS device connect scenario.
> + */
>
> - dwc3_qcom_enable_wakeup_irq(qcom->dm_hs_phy_irq);
> + if (qcom->usb2_speed == USB_SPEED_LOW) {
> + dwc3_qcom_enable_wakeup_irq(qcom->dm_hs_phy_irq,
> + IRQ_TYPE_EDGE_FALLING);
> + } else if ((qcom->usb2_speed == USB_SPEED_HIGH) ||
> + (qcom->usb2_speed == USB_SPEED_FULL)) {
> + dwc3_qcom_enable_wakeup_irq(qcom->dp_hs_phy_irq,
> + IRQ_TYPE_EDGE_FALLING);
> + } else {
> + dwc3_qcom_enable_wakeup_irq(qcom->dp_hs_phy_irq,
> + IRQ_TYPE_EDGE_RISING);
> + dwc3_qcom_enable_wakeup_irq(qcom->dm_hs_phy_irq,
> + IRQ_TYPE_EDGE_RISING);
> + }
>
> - dwc3_qcom_enable_wakeup_irq(qcom->ss_phy_irq);
> + dwc3_qcom_enable_wakeup_irq(qcom->ss_phy_irq, 0);
> }
>
> static int dwc3_qcom_suspend(struct dwc3_qcom *qcom)
> @@ -355,8 +405,10 @@ static int dwc3_qcom_suspend(struct dwc3_qcom *qcom)
> if (ret)
> dev_warn(qcom->dev, "failed to disable interconnect: %d\n", ret);
>
> - if (device_may_wakeup(qcom->dev))
> + if (device_may_wakeup(qcom->dev)) {
> + qcom->usb2_speed = dwc3_qcom_read_usb2_speed(qcom);
> dwc3_qcom_enable_interrupts(qcom);
> + }
>
> qcom->is_suspended = true;
>
Looks good to me.
Reviewed-by: Pavankumar Kondeti <quic_pkondeti@...cinc.com>
Thanks,
Pavan
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