Hema, > -----Original Message----- > From: linux-omap-owner@xxxxxxxxxxxxxxx [mailto:linux-omap- > owner@xxxxxxxxxxxxxxx] On Behalf Of Hema HK > Sent: Friday, August 06, 2010 10:57 PM > To: linux-usb@xxxxxxxxxxxxxxx; linux-omap@xxxxxxxxxxxxxxx > Cc: Kalliguddi, Hema; Mankad, Maulik Ojas; Felipe Balbi; Tony Lindgren; > Kevin Hilman > Subject: [PATCH V2 6/8] usb: musb: Offmode fix for idle path > > From: Hema HK <hemahk@xxxxxx> > > With OMAP core-off support musb was not functional as context was getting > lost after wakeup from core-off. And also musb was blocking the core-off > after loading the gadget driver even with no cable connected sometimes. > > Added the conext save/restore api in the platform layer which will > be called in the idle and wakeup path. > > Changed the usb sysconfig settings as per the usbotg functional spec. > When the device is not active, configure to force idle and force standby > mode. > When it is being used, configure in smart standby and smart idle mode. > So while attempting to coreoff the usb is configured to force standby and > force idle mode, after wakeup configured in smart idle and smart standby. > > Signed-off-by: Hema HK <hemahk@xxxxxx> > Signed-off-by: Maulik Mankad <x0082077@xxxxxx> > > Cc: Felipe Balbi <felipe.balbi@xxxxxxxxx> > Cc: Tony Lindgren <tony@xxxxxxxxxxx> > Cc: Kevin Hilman <khilman@xxxxxxxxxxxxxxxxxxx> > --- > > arch/arm/mach-omap2/pm34xx.c | 4 ++ > arch/arm/mach-omap2/usb-musb.c | 21 ++++++++++++++ > arch/arm/plat-omap/include/plat/usb.h | 2 + > drivers/usb/musb/musb_core.c | 11 ------- > drivers/usb/musb/omap2430.c | 48 > +++++++++++++++++++++++++++++++--- > 5 files changed, 71 insertions(+), 15 deletions(-) > > Index: linux-omap-pm/arch/arm/mach-omap2/pm34xx.c > =================================================================== > --- linux-omap-pm.orig/arch/arm/mach-omap2/pm34xx.c 2010-08-06 > 09:23:01.153862710 -0400 > +++ linux-omap-pm/arch/arm/mach-omap2/pm34xx.c 2010-08-06 > 10:44:06.393863125 -0400 > @@ -39,6 +39,7 @@ > #include <plat/gpmc.h> > #include <plat/dma.h> > #include <plat/dmtimer.h> > +#include <plat/usb.h> > > #include <asm/tlbflush.h> > > @@ -416,6 +417,8 @@ > if (core_next_state == PWRDM_POWER_OFF) { > omap3_core_save_context(); > omap3_prcm_save_context(); > + /* Save MUSB context */ > + musb_context_save_restore(1); > } > } > > @@ -458,6 +461,8 @@ > omap3_prcm_restore_context(); > omap3_sram_restore_context(); > omap2_sms_restore_context(); > + /* restore MUSB context */ > + musb_context_save_restore(0); > } > omap_uart_resume_idle(0); > omap_uart_resume_idle(1); > Index: linux-omap-pm/arch/arm/mach-omap2/usb-musb.c > =================================================================== > --- linux-omap-pm.orig/arch/arm/mach-omap2/usb-musb.c 2010-08-06 > 09:24:23.690112596 -0400 > +++ linux-omap-pm/arch/arm/mach-omap2/usb-musb.c 2010-08-06 > 10:44:06.385862697 -0400 > @@ -120,6 +120,27 @@ > } > } > > +void musb_context_save_restore(int save) > +{ > + struct omap_hwmod *oh = omap_hwmod_lookup("usb_otg_hs"); Might be good idea to check (oh) before proceeding? if (!oh) { /* error message */ return; } > + struct omap_device *od = oh->od; > + struct platform_device *pdev = &od->pdev; > + struct device *dev = &pdev->dev; > + struct device_driver *drv = dev->driver; > + > + if (drv) { > + struct musb_hdrc_platform_data *pdata = dev->platform_data; > + const struct dev_pm_ops *pm = drv->pm; > + if (!pdata->is_usb_active(dev)) { > + > + if (save) > + pm->suspend(dev); > + else > + pm->resume_noirq(dev); > + } > + } > +} > + > #else > void __init usb_musb_init(struct omap_musb_board_data *board_data) > { > Index: linux-omap-pm/arch/arm/plat-omap/include/plat/usb.h > =================================================================== > --- linux-omap-pm.orig/arch/arm/plat-omap/include/plat/usb.h 2010-08- > 06 09:23:01.137862514 -0400 > +++ linux-omap-pm/arch/arm/plat-omap/include/plat/usb.h 2010-08-06 > 10:44:06.381864367 -0400 > @@ -79,6 +79,8 @@ > > extern void usb_ohci_init(const struct ohci_hcd_omap_platform_data > *pdata); > > +/* For saving and restoring the musb context during off/wakeup*/ > +extern void musb_context_save_restore(int save); > #endif > > > Index: linux-omap-pm/drivers/usb/musb/musb_core.c > =================================================================== > --- linux-omap-pm.orig/drivers/usb/musb/musb_core.c 2010-08-06 > 09:24:21.069863329 -0400 > +++ linux-omap-pm/drivers/usb/musb/musb_core.c 2010-08-06 > 10:44:06.369863527 -0400 > @@ -2427,11 +2427,6 @@ > } > > musb_save_context(musb); > - > - if (musb->set_clock) > - musb->set_clock(musb->clock, 0); > - else > - clk_disable(musb->clock); > spin_unlock_irqrestore(&musb->lock, flags); > return 0; > } > @@ -2443,12 +2438,6 @@ > > if (!musb->clock) > return 0; > - > - if (musb->set_clock) > - musb->set_clock(musb->clock, 1); > - else > - clk_enable(musb->clock); > - > musb_restore_context(musb); > > /* for static cmos like DaVinci, register values were preserved > Index: linux-omap-pm/drivers/usb/musb/omap2430.c > =================================================================== > --- linux-omap-pm.orig/drivers/usb/musb/omap2430.c 2010-08-06 > 09:24:21.069863329 -0400 > +++ linux-omap-pm/drivers/usb/musb/omap2430.c 2010-08-06 > 10:44:30.093914217 -0400 > @@ -189,6 +189,19 @@ > return 0; > } > > +int is_musb_active(struct device *dev) > +{ > + struct musb *musb; > + > +#ifdef CONFIG_USB_MUSB_HDRC_HCD > + /* usbcore insists dev->driver_data is a "struct hcd *" */ > + musb = hcd_to_musb(dev_get_drvdata(dev)); > +#else > + musb = dev_get_drvdata(dev); > +#endif > + return musb->is_active; > +} > + > int __init musb_platform_init(struct musb *musb) > { > u32 l; > @@ -250,6 +263,7 @@ > if (is_host_enabled(musb)) > musb->board_set_vbus = omap_set_vbus; > > + plat->is_usb_active = is_musb_active; > setup_timer(&musb_idle_timer, musb_do_idle, (unsigned long) musb); > > return 0; > @@ -259,15 +273,42 @@ > void musb_platform_save_context(struct musb *musb, > struct musb_context_registers *musb_context) > { > - musb_context->otg_sysconfig = musb_readl(musb->mregs, OTG_SYSCONFIG); > - musb_context->otg_forcestandby = musb_readl(musb->mregs, > OTG_FORCESTDBY); > + /* > + * As per the omap-usbotg specification, configure it to forced > standby > + * and force idle mode when no activity on usb. > + */ > + void __iomem *musb_base = musb->mregs; > + Just to clarify, have you already taken care of ioremap() / request_mem_region() for musb_base? > + musb_writel(musb_base, OTG_FORCESTDBY, 0); > + > + musb_writel(musb_base, OTG_SYSCONFIG, musb_readl(musb_base, > + OTG_SYSCONFIG) & ~(NOSTDBY | SMARTSTDBY)); > + > + musb_writel(musb_base, OTG_SYSCONFIG, musb_readl(musb_base, > + OTG_SYSCONFIG) & ~(AUTOIDLE)); > + > + musb_writel(musb_base, OTG_SYSCONFIG, musb_readl(musb_base, > + OTG_SYSCONFIG) & ~(NOIDLE | SMARTIDLE)); > + > + musb_writel(musb_base, OTG_FORCESTDBY, 1); > } > > void musb_platform_restore_context(struct musb *musb, > struct musb_context_registers *musb_context) > { > - musb_writel(musb->mregs, OTG_SYSCONFIG, musb_context->otg_sysconfig); > - musb_writel(musb->mregs, OTG_FORCESTDBY, musb_context- > >otg_forcestandby); > + /* > + * As per the omap-usbotg specification, configure it smart standby > + * and smart idle during operation. > + */ > + void __iomem *musb_base = musb->mregs; > + > + musb_writel(musb_base, OTG_FORCESTDBY, 0); > + > + musb_writel(musb_base, OTG_SYSCONFIG, musb_readl(musb_base, > + OTG_SYSCONFIG) | (SMARTSTDBY)); > + > + musb_writel(musb_base, OTG_SYSCONFIG, musb_readl(musb_base, > + OTG_SYSCONFIG) | (SMARTIDLE)); > } > #endif > > Index: linux-omap-pm/include/linux/usb/musb.h > =================================================================== > --- linux-omap-pm.orig/include/linux/usb/musb.h 2010-08-06 > 09:23:01.161864151 -0400 > +++ linux-omap-pm/include/linux/usb/musb.h 2010-08-06 10:44:06.401862567 > -0400 > @@ -126,6 +126,9 @@ > > /* Architecture specific board data */ > void *board_data; > + > + /* check usb device active state*/ > + int (*is_usb_active)(struct device *dev); > }; > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-omap" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
