>-----Original Message----- >From: Bob Liu [mailto:lliubbo@xxxxxxxxx] >Sent: Saturday, August 07, 2010 7:54 AM >To: Kalliguddi, Hema >Cc: linux-usb@xxxxxxxxxxxxxxx; linux-omap@xxxxxxxxxxxxxxx; >Mankad, Maulik Ojas; Felipe Balbi; Tony Lindgren; Kevin Hilman >Subject: Re: [PATCH V2 6/8] usb: musb: Offmode fix for idle path > >On Sat, Aug 7, 2010 at 1:27 AM, Hema HK <hemahk@xxxxxx> wrote: >> 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"); >> + 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; > >Is this check can be deleted also ? >Because our blackfin platform have no clock support now. I think this can be removed. >Thanks. > >> - >> - 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; >> + >> + 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-usb" in >> the body of a message to majordomo@xxxxxxxxxxxxxxx >> More majordomo info at http://vger.kernel.org/majordomo-info.html >> > >-- >Regards, >--Bob >-- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
