Hi Felipe,
On 11 October 2012 13:17, Felipe Balbi <balbi@xxxxxx> wrote:
>
> Hi,
>
> On Wed, Oct 10, 2012 at 07:35:47PM +0530, Vikas C Sajjan wrote:
> > From: Vikas Sajjan <vikas.sajjan@xxxxxxxxxx>
> >
> > Adding the suspend and resume funtionality to DWC3 core.
> >
> > Signed-off-by: Abhilash Kesavan <a.kesavan@xxxxxxxxxxx>
> > Signed-off-by: Vikas C Sajjan <vikas.sajjan@xxxxxxxxxx>
> > CC: Doug Anderson <dianders@xxxxxxxxxxxx>
> > ---
> > drivers/usb/dwc3/core.c | 268
> > +++++++++++++++++++++++++++++-----------------
> > 1 files changed, 169 insertions(+), 99 deletions(-)
> >
> > diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> > index b415c0c..58b51e1 100644
> > --- a/drivers/usb/dwc3/core.c
> > +++ b/drivers/usb/dwc3/core.c
> > @@ -70,51 +70,20 @@ MODULE_PARM_DESC(maximum_speed, "Maximum supported
> > speed.");
> >
> > static DECLARE_BITMAP(dwc3_devs, DWC3_DEVS_POSSIBLE);
> >
> > -int dwc3_get_device_id(void)
> > -{
> > - int id;
> > -
> > -again:
> > - id = find_first_zero_bit(dwc3_devs, DWC3_DEVS_POSSIBLE);
> > - if (id < DWC3_DEVS_POSSIBLE) {
> > - int old;
> > -
> > - old = test_and_set_bit(id, dwc3_devs);
> > - if (old)
> > - goto again;
> > - } else {
> > - pr_err("dwc3: no space for new device\n");
> > - id = -ENOMEM;
> > - }
> > -
> > - return id;
> > -}
> > -EXPORT_SYMBOL_GPL(dwc3_get_device_id);
> > -
> > -void dwc3_put_device_id(int id)
> > -{
> > - int ret;
> > -
> > - if (id < 0)
> > - return;
> > -
> > - ret = test_bit(id, dwc3_devs);
> > - WARN(!ret, "dwc3: ID %d not in use\n", id);
> > - smp_mb__before_clear_bit();
> > - clear_bit(id, dwc3_devs);
> > -}
> > -EXPORT_SYMBOL_GPL(dwc3_put_device_id);
> > -
> > -void dwc3_set_mode(struct dwc3 *dwc, u32 mode)
>
> why are you even moving all this code around ? Doesn't look necessary.
>
> > +static void __devinit dwc3_cache_hwparams(struct dwc3 *dwc)
> > {
> > - u32 reg;
> > + struct dwc3_hwparams *parms = &dwc->hwparams;
> >
> > - reg = dwc3_readl(dwc->regs, DWC3_GCTL);
> > - reg &= ~(DWC3_GCTL_PRTCAPDIR(DWC3_GCTL_PRTCAP_OTG));
> > - reg |= DWC3_GCTL_PRTCAPDIR(mode);
> > - dwc3_writel(dwc->regs, DWC3_GCTL, reg);
> > + parms->hwparams0 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS0);
> > + parms->hwparams1 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS1);
> > + parms->hwparams2 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS2);
> > + parms->hwparams3 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS3);
> > + parms->hwparams4 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS4);
> > + parms->hwparams5 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS5);
> > + parms->hwparams6 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS6);
> > + parms->hwparams7 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS7);
> > + parms->hwparams8 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS8);
> > }
> > -
> > /**
> > * dwc3_core_soft_reset - Issues core soft reset and PHY reset
> > * @dwc: pointer to our context structure
> > @@ -160,6 +129,102 @@ static void dwc3_core_soft_reset(struct dwc3 *dwc)
> > dwc3_writel(dwc->regs, DWC3_GCTL, reg);
> > }
> >
> > +static int dwc3_core_reset(struct dwc3 *dwc)
>
> this looks unnecessary.
>
dwc3_core_reset() function is added to avoid the code duplication, and
can be reused both in probe and resume.
> > +{
> > + unsigned long timeout;
> > + u32 reg;
> > +
> > + /* issue device SoftReset too */
> > + timeout = jiffies + msecs_to_jiffies(500);
> > + dwc3_writel(dwc->regs, DWC3_DCTL, DWC3_DCTL_CSFTRST);
> > + do {
> > + reg = dwc3_readl(dwc->regs, DWC3_DCTL);
> > + if (!(reg & DWC3_DCTL_CSFTRST))
> > + break;
> > +
> > + if (time_after(jiffies, timeout)) {
> > + dev_err(dwc->dev, "Reset Timed Out\n");
> > + return -ETIMEDOUT;
> > + }
> > +
> > + cpu_relax();
> > + } while (true);
> > +
> > + dwc3_core_soft_reset(dwc);
> > +
> > + dwc3_cache_hwparams(dwc);
> > +
> > + reg = dwc3_readl(dwc->regs, DWC3_GCTL);
> > + reg &= ~DWC3_GCTL_SCALEDOWN_MASK;
> > + reg &= ~DWC3_GCTL_DISSCRAMBLE;
> > +
> > + switch (DWC3_GHWPARAMS1_EN_PWROPT(dwc->hwparams.hwparams1)) {
> > + case DWC3_GHWPARAMS1_EN_PWROPT_CLK:
> > + reg &= ~DWC3_GCTL_DSBLCLKGTNG;
> > + break;
> > + default:
> > + dev_dbg(dwc->dev, "No power optimization available\n");
> > + }
> > +
> > + /*
> > + * WORKAROUND: DWC3 revisions <1.90a have a bug
> > + * where the device can fail to connect at SuperSpeed
> > + * and falls back to high-speed mode which causes
> > + * the device to enter a Connect/Disconnect loop
> > + */
> > + if (dwc->revision < DWC3_REVISION_190A)
> > + reg |= DWC3_GCTL_U2RSTECN;
> > +
> > + dwc3_writel(dwc->regs, DWC3_GCTL, reg);
> > +
> > + return 0;
> > +}
> > +
> > +int dwc3_get_device_id(void)
> > +{
> > + int id;
> > +
> > +again:
> > + id = find_first_zero_bit(dwc3_devs, DWC3_DEVS_POSSIBLE);
> > + if (id < DWC3_DEVS_POSSIBLE) {
> > + int old;
> > +
> > + old = test_and_set_bit(id, dwc3_devs);
> > + if (old)
> > + goto again;
> > + } else {
> > + pr_err("dwc3: no space for new device\n");
> > + id = -ENOMEM;
> > + }
> > +
> > + return id;
> > +}
> > +EXPORT_SYMBOL_GPL(dwc3_get_device_id);
> > +
> > +void dwc3_put_device_id(int id)
> > +{
> > + int ret;
> > +
> > + if (id < 0)
> > + return;
> > +
> > + ret = test_bit(id, dwc3_devs);
> > + WARN(!ret, "dwc3: ID %d not in use\n", id);
> > + smp_mb__before_clear_bit();
> > + clear_bit(id, dwc3_devs);
> > +}
> > +EXPORT_SYMBOL_GPL(dwc3_put_device_id);
> > +
> > +void dwc3_set_mode(struct dwc3 *dwc, u32 mode)
> > +{
> > + u32 reg;
> > +
> > + reg = dwc3_readl(dwc->regs, DWC3_GCTL);
> > + reg &= ~(DWC3_GCTL_PRTCAPDIR(DWC3_GCTL_PRTCAP_OTG));
> > + reg |= DWC3_GCTL_PRTCAPDIR(mode);
> > + dwc3_writel(dwc->regs, DWC3_GCTL, reg);
> > +}
> > +
> > /**
> > * dwc3_free_one_event_buffer - Frees one event buffer
> > * @dwc: Pointer to our controller context structure
> > @@ -303,20 +368,7 @@ static void dwc3_event_buffers_cleanup(struct dwc3
> > *dwc)
> > }
> > }
> >
> > -static void __devinit dwc3_cache_hwparams(struct dwc3 *dwc)
> > -{
> > - struct dwc3_hwparams *parms = &dwc->hwparams;
> >
> > - parms->hwparams0 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS0);
> > - parms->hwparams1 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS1);
> > - parms->hwparams2 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS2);
> > - parms->hwparams3 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS3);
> > - parms->hwparams4 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS4);
> > - parms->hwparams5 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS5);
> > - parms->hwparams6 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS6);
> > - parms->hwparams7 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS7);
> > - parms->hwparams8 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS8);
> > -}
> >
> > /**
> > * dwc3_core_init - Low-level initialization of DWC3 Core
> > @@ -326,7 +378,6 @@ static void __devinit dwc3_cache_hwparams(struct
> > dwc3 *dwc)
> > */
> > static int __devinit dwc3_core_init(struct dwc3 *dwc)
> > {
> > - unsigned long timeout;
> > u32 reg;
> > int ret;
> >
> > @@ -339,49 +390,9 @@ static int __devinit dwc3_core_init(struct dwc3
> > *dwc)
> > }
> > dwc->revision = reg;
> >
> > - /* issue device SoftReset too */
> > - timeout = jiffies + msecs_to_jiffies(500);
> > - dwc3_writel(dwc->regs, DWC3_DCTL, DWC3_DCTL_CSFTRST);
> > - do {
> > - reg = dwc3_readl(dwc->regs, DWC3_DCTL);
> > - if (!(reg & DWC3_DCTL_CSFTRST))
> > - break;
> > -
> > - if (time_after(jiffies, timeout)) {
> > - dev_err(dwc->dev, "Reset Timed Out\n");
> > - ret = -ETIMEDOUT;
> > - goto err0;
> > - }
> > -
> > - cpu_relax();
> > - } while (true);
> > -
> > - dwc3_core_soft_reset(dwc);
> > -
> > - dwc3_cache_hwparams(dwc);
> > -
> > - reg = dwc3_readl(dwc->regs, DWC3_GCTL);
> > - reg &= ~DWC3_GCTL_SCALEDOWN_MASK;
> > - reg &= ~DWC3_GCTL_DISSCRAMBLE;
> > -
> > - switch (DWC3_GHWPARAMS1_EN_PWROPT(dwc->hwparams.hwparams1)) {
> > - case DWC3_GHWPARAMS1_EN_PWROPT_CLK:
> > - reg &= ~DWC3_GCTL_DSBLCLKGTNG;
> > - break;
> > - default:
> > - dev_dbg(dwc->dev, "No power optimization available\n");
> > - }
> > -
> > - /*
> > - * WORKAROUND: DWC3 revisions <1.90a have a bug
> > - * where the device can fail to connect at SuperSpeed
> > - * and falls back to high-speed mode which causes
> > - * the device to enter a Connect/Disconnect loop
> > - */
> > - if (dwc->revision < DWC3_REVISION_190A)
> > - reg |= DWC3_GCTL_U2RSTECN;
> > -
> > - dwc3_writel(dwc->regs, DWC3_GCTL, reg);
> > + ret = dwc3_core_reset(dwc);
> > + if (ret < 0)
> > + goto err0;
> >
> > ret = dwc3_alloc_event_buffers(dwc, DWC3_EVENT_BUFFERS_SIZE);
>
> I would rather move dwc3_alloc_event_buffers() outside of
> dwc3_core_init() and use that directly on ->resume(). dwc3_core_init()
> shouldn't be doing any memory allocations, so we can re-use it, and it
> doesn't matter when we allocate the event buffers anyway.
>
dwc3_alloc_event_buffers() was already inside the dwc3_core_init() in
the existing code, the only change I made is, a common function called
dwc3_core_reset() is added which will be used both in probe and
resume.
so basically resume only does dwc3_core_reset() and
dwc3_event_buffers_setup() as dwc3_alloc_event_buffers() is done in
probe.
> > @@ -622,11 +633,70 @@ static int __devexit dwc3_remove(struct
> > platform_device *pdev)
> > return 0;
> > }
> >
> > +#ifdef CONFIG_PM
> > +static int dwc3_core_resume(struct device *dev)
> > +{
> > + struct dwc3 *dwc;
> > + int ret;
> > +
> > + dwc = dev_get_drvdata(dev);
>
> can be done together with declaration.
>
> > + if (!dwc)
> > + return -EINVAL;
>
> unnecessary.
>
> > + ret = dwc3_core_reset(dwc);
> > + if (ret < 0)
> > + return ret;
> > +
> > + ret = dwc3_event_buffers_setup(dwc);
> > + if (ret < 0)
> > + return ret;
> > +
> > + switch (dwc->mode) {
> > + case DWC3_MODE_DEVICE:
> > + dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_DEVICE);
> > + break;
> > + case DWC3_MODE_HOST:
> > + dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_HOST);
> > + break;
> > + case DWC3_MODE_DRD:
> > + dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_OTG);
> > + }
> > +
> > + /* runtime set active to reflect active state. */
> > + pm_runtime_disable(dev);
> > + pm_runtime_set_active(dev);
> > + pm_runtime_enable(dev);
> > +
> > + return 0;
> > +}
> > +
> > +static int dwc3_core_suspend(struct device *dev)
> > +{
> > + struct dwc3 *dwc;
> > +
> > + dwc = dev_get_drvdata(dev);
> > + if (!dwc)
> > + return -EINVAL;
> > +
> > + dwc3_event_buffers_cleanup(dwc);
> > +
> > + return 0;
> > +}
> > +
> > +static const struct dev_pm_ops dwc3_core_pm_ops = {
>
> A little nit-picky, but I would rather you remove the _core part of the
> prefix :-p likewise for suspend and resume callbacks.
>
> > + .suspend = dwc3_core_suspend,
> > + .resume = dwc3_core_resume,
> > +};
>
> #define DWC3_PM_OPS &(dwc3_pm_ops)
> #else
> #define DWC3_PM_OPS NULL
>
> > +#endif /* CONFIG_PM */
> > +
> > static struct platform_driver dwc3_driver = {
> > .probe = dwc3_probe,
> > .remove = __devexit_p(dwc3_remove),
> > .driver = {
> > .name = "dwc3",
> > +#ifdef CONFIG_PM
> > + .pm = &dwc3_core_pm_ops,
> > +#endif
>
> remove ifdef:
>
> .pm = DWC3_PM_OPS,
>
> --
> balbi
--
Thanks and Regards
Vikas Sajjan
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