[PATCH 06/12] usb: dwc3: qcom: Add dwc3 core reference in driver state

Bjorn Andersson
2023-10-17T03:11:44Z

In the coming changes the Qualcomm DWC3 glue will be able to either
manage the DWC3 core as a child platform_device, or directly instantiate
it within its own context.

Introduce a reference to the dwc3 core state and make the driver
reference the dwc3 core either the child device or this new reference.

As the new member isn't assigned, and qcom->dwc_dev is assigned in all
current cases, the change should have no functional impact.

Signed-off-by: Bjorn Andersson <quic_bjorande@quicinc.com>
---
drivers/usb/dwc3/dwc3-qcom.c | 100 +++++++++++++++++++++++++++++++++++--------
1 file changed, 83 insertions(+), 17 deletions(-)

diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
index 7c810712d246..901e5050363b 100644
--- a/drivers/usb/dwc3/dwc3-qcom.c
+++ b/drivers/usb/dwc3/dwc3-qcom.c
@@ -67,7 +67,8 @@ struct dwc3_acpi_pdata {
struct dwc3_qcom {
struct device *dev;
void __iomem *qscratch_base;
- struct platform_device *dwc_dev;
+ struct platform_device *dwc_dev; /* only used when core is separate device */
+ struct dwc3 *dwc; /* not used when core is separate device */
struct clk **clks;
int num_clocks;
struct reset_control *resets;
@@ -263,7 +264,11 @@ static int dwc3_qcom_interconnect_init(struct dwc3_qcom *qcom)
goto put_path_ddr;
}

- max_speed = usb_get_maximum_speed(&qcom->dwc_dev->dev);
+ if (qcom->dwc_dev)
+ max_speed = usb_get_maximum_speed(&qcom->dwc_dev->dev);
+ else
+ max_speed = usb_get_maximum_speed(qcom->dev);
+
if (max_speed >= USB_SPEED_SUPER || max_speed == USB_SPEED_UNKNOWN) {
ret = icc_set_bw(qcom->icc_path_ddr,
USB_MEMORY_AVG_SS_BW, USB_MEMORY_PEAK_SS_BW);
@@ -311,7 +316,10 @@ static bool dwc3_qcom_is_host(struct dwc3_qcom *qcom)
/*
* FIXME: Fix this layering violation.
*/
- dwc = platform_get_drvdata(qcom->dwc_dev);
+ if (qcom->dwc_dev)
+ dwc = platform_get_drvdata(qcom->dwc_dev);
+ else
+ dwc = qcom->dwc;

/* Core driver may not have probed yet. */
if (!dwc)
@@ -322,10 +330,14 @@ static bool dwc3_qcom_is_host(struct dwc3_qcom *qcom)

static enum usb_device_speed dwc3_qcom_read_usb2_speed(struct dwc3_qcom *qcom)
{
- struct dwc3 *dwc = platform_get_drvdata(qcom->dwc_dev);
struct usb_device *udev;
struct usb_hcd __maybe_unused *hcd;
+ struct dwc3 *dwc;

+ if (qcom->dwc_dev)
+ dwc = platform_get_drvdata(qcom->dwc_dev);
+ else
+ dwc = qcom->dwc;
/*
* FIXME: Fix this layering violation.
*/
@@ -485,12 +497,17 @@ static int dwc3_qcom_resume(struct dwc3_qcom *qcom, bool wakeup)
static irqreturn_t qcom_dwc3_resume_irq(int irq, void *data)
{
struct dwc3_qcom *qcom = data;
- struct dwc3 *dwc = platform_get_drvdata(qcom->dwc_dev);
+ struct dwc3 *dwc;

/* If pm_suspended then let pm_resume take care of resuming h/w */
if (qcom->pm_suspended)
return IRQ_HANDLED;

+ if (qcom->dwc_dev)
+ dwc = platform_get_drvdata(qcom->dwc_dev);
+ else
+ dwc = qcom->dwc;
+
/*
* This is safe as role switching is done from a freezable workqueue
* and the wakeup interrupts are disabled as part of resume.
@@ -936,25 +953,33 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
if (ret)
goto depopulate;

- qcom->mode = usb_get_dr_mode(&qcom->dwc_dev->dev);
+ if (qcom->dwc_dev)
+ qcom->mode = usb_get_dr_mode(&qcom->dwc_dev->dev);
+ else
+ qcom->mode = usb_get_dr_mode(dev);

/* enable vbus override for device mode */
if (qcom->mode != USB_DR_MODE_HOST)
dwc3_qcom_vbus_override_enable(qcom, true);

- /* register extcon to override sw_vbus on Vbus change later */
- ret = dwc3_qcom_register_extcon(qcom);
- if (ret)
- goto interconnect_exit;
+ if (qcom->dwc_dev) {
+ /* register extcon to override sw_vbus on Vbus change later */
+ ret = dwc3_qcom_register_extcon(qcom);
+ if (ret)
+ goto interconnect_exit;
+ }

wakeup_source = of_property_read_bool(dev->of_node, "wakeup-source");
device_init_wakeup(&pdev->dev, wakeup_source);
- device_init_wakeup(&qcom->dwc_dev->dev, wakeup_source);
+ if (qcom->dwc_dev)
+ device_init_wakeup(&qcom->dwc_dev->dev, wakeup_source);

qcom->is_suspended = false;
- pm_runtime_set_active(dev);
- pm_runtime_enable(dev);
- pm_runtime_forbid(dev);
+ if (qcom->dwc_dev) {
+ pm_runtime_set_active(dev);
+ pm_runtime_enable(dev);
+ pm_runtime_forbid(dev);
+ }

return 0;

@@ -983,6 +1008,9 @@ static void dwc3_qcom_remove(struct platform_device *pdev)
struct device *dev = &pdev->dev;
int i;

+ if (qcom->dwc)
+ dwc3_remove(qcom->dwc);
+
device_remove_software_node(&qcom->dwc_dev->dev);
if (np)
of_platform_depopulate(&pdev->dev);
@@ -998,8 +1026,10 @@ static void dwc3_qcom_remove(struct platform_device *pdev)
dwc3_qcom_interconnect_exit(qcom);
reset_control_assert(qcom->resets);

- pm_runtime_allow(dev);
- pm_runtime_disable(dev);
+ if (qcom->dwc_dev) {
+ pm_runtime_allow(dev);
+ pm_runtime_disable(dev);
+ }
}

static int __maybe_unused dwc3_qcom_pm_suspend(struct device *dev)
@@ -1008,6 +1038,12 @@ static int __maybe_unused dwc3_qcom_pm_suspend(struct device *dev)
bool wakeup = device_may_wakeup(dev);
int ret;

+ if (qcom->dwc) {
+ ret = dwc3_suspend(qcom->dwc);
+ if (ret)
+ return ret;
+ }
+
ret = dwc3_qcom_suspend(qcom, wakeup);
if (ret)
return ret;
@@ -1029,12 +1065,33 @@ static int __maybe_unused dwc3_qcom_pm_resume(struct device *dev)

qcom->pm_suspended = false;

+ if (qcom->dwc) {
+ ret = dwc3_resume(qcom->dwc);
+ if (ret)
+ return ret;
+ }
+
return 0;
}

+static void dwc3_qcom_complete(struct device *dev)
+{
+ struct dwc3_qcom *qcom = dev_get_drvdata(dev);
+
+ if (qcom->dwc)
+ dwc3_complete(qcom->dwc);
+}
+
static int __maybe_unused dwc3_qcom_runtime_suspend(struct device *dev)
{
struct dwc3_qcom *qcom = dev_get_drvdata(dev);
+ int ret;
+
+ if (qcom->dwc) {
+ ret = dwc3_runtime_suspend(qcom->dwc);
+ if (ret)
+ return ret;
+ }

return dwc3_qcom_suspend(qcom, true);
}
@@ -1042,12 +1099,21 @@ static int __maybe_unused dwc3_qcom_runtime_suspend(struct device *dev)
static int __maybe_unused dwc3_qcom_runtime_resume(struct device *dev)
{
struct dwc3_qcom *qcom = dev_get_drvdata(dev);
+ int ret;
+
+ ret = dwc3_qcom_resume(qcom, true);
+ if (ret)
+ return ret;

- return dwc3_qcom_resume(qcom, true);
+ if (qcom->dwc)
+ return dwc3_runtime_resume(qcom->dwc);
+
+ return 0;
}

static const struct dev_pm_ops dwc3_qcom_dev_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(dwc3_qcom_pm_suspend, dwc3_qcom_pm_resume)
+ .complete = dwc3_qcom_complete,
SET_RUNTIME_PM_OPS(dwc3_qcom_runtime_suspend, dwc3_qcom_runtime_resume,
NULL)
};

--
2.25.1