>-----Original Message----- >From: ext Kevin Hilman [mailto:khilman@xxxxxxxxxxxxxxxxxxx] >Sent: 14 May, 2009 18:56 >To: Kristo Tero (Nokia-D/Tampere) >Cc: linux-omap@xxxxxxxxxxxxxxx >Subject: Re: [PATCH] OMAP3: PM: Force USB to standby if not used > >Tero Kristo <tero.kristo@xxxxxxxxx> writes: > >> From: Tero Kristo <tero.kristo@xxxxxxxxx> >> >> This patch will allow device to enter sleep mode while a USB >cable is >> connected and USB is either disabled or built as a module >from kernel >> config. >> >> Applies on top of PM branch. >> >> Signed-off-by: Tero Kristo <tero.kristo@xxxxxxxxx> >> --- >> arch/arm/mach-omap2/usb-musb.c | 10 ++++++++-- >> 1 files changed, 8 insertions(+), 2 deletions(-) >> >> diff --git a/arch/arm/mach-omap2/usb-musb.c >> b/arch/arm/mach-omap2/usb-musb.c index 12a9b0a..dd51d2f 100644 >> --- a/arch/arm/mach-omap2/usb-musb.c >> +++ b/arch/arm/mach-omap2/usb-musb.c >> @@ -32,7 +32,9 @@ >> #include <mach/usb.h> >> >> #define AUTOIDLE (1 << 0) >> +#define FORCESTDBY (1 << 0) >> #define OTG_SYSCONFIG (OMAP34XX_HSUSB_OTG_BASE + 0x404) >> +#define OTG_FORCESTDBY (OMAP34XX_HSUSB_OTG_BASE + 0x414) >> >> static struct resource musb_resources[] = { >> [0] = { /* start and end set dynamically */ @@ -185,7 >+187,11 @@ >> void __init usb_musb_init(void) >> return; >> } >> >> - /* Enable smartidle on MUSB to improve C1 wakeup latency */ >> - if (cpu_is_omap34xx()) >> +#if !defined(CONFIG_USB) || defined(CONFIG_USB_MODULE) >> + /* Force MUSB to standby if not used */ >> + if (cpu_is_omap34xx()) { >> omap_writel(AUTOIDLE, OTG_SYSCONFIG); >> + omap_writel(FORCESTDBY, OTG_FORCESTDBY); >> + } >> +#endif > >Tero, > >Is this needed if OTG_SYSCONFIG is set to force-idle? > >Yesterday, I pushed a patch changing OTG_SYSCONFIG to >force-idle instead of auto-idle since on ES3.0 3430SDP, having >it in auto-idle was keeping CORE from hitting retention. >IIUC, there's an errata where force-idle doesn't work properly. > >Also, why the #ifdefs? > >This code is already conditionally compiled based on >CONFIG_USB_MUSB_SOC (see mach-omap2/Makefile) which is set >whether MUSB is built-in or a module. > >#if !defined(CONFIG_USB) then CONFIG_USB_MUSB_SOC will not be >defined either. You are actually right, I missed that change to Makefile. The reason for this patch was to be able to hit retention / off when USB is not enabled, and this was possible with the #ifdef:s earlier. I think you can just ignore this patch. -Tero-- 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
