Kalle, I just found an issue with the pwrdm_enable_hdwr_sar function which would actually leave the SAVEANDRESTORE bit unchanged in the PWSTCTRL register. http://marc.info/?l=linux-omap&m=124420689003913&w=2
The issue you were seeing with USBHOST might not really be with enabling the SAR on USBHOST but something else. regards, Rajendra >-----Original Message----- >From: linux-omap-ow...@vger.kernel.org >[mailto:linux-omap-ow...@vger.kernel.org] On Behalf Of Kalle Jokiniemi >Sent: Thursday, April 23, 2009 4:29 PM >To: t...@atomide.com >Cc: khil...@deeprootsystems.com; p...@pwsan.com; >linux-omap@vger.kernel.org; Menon, Nishanth; Woodruff, >Richard; Kalle Jokiniemi; Kalle Jokiniemi >Subject: [PATCH] PM: Disable usb host HW save and restore > >The hardware SAVEANDRESTORE mechanism seems to leave >USB HOST power domain permanently into active state >after one transition from off to active state. >Disabling for now. > >Signed-off-by: Kalle Jokiniemi <ext-kalle.jokini...@nokia.com> >--- > arch/arm/mach-omap2/powerdomains34xx.h | 8 +++++++- > 1 files changed, 7 insertions(+), 1 deletions(-) > >diff --git a/arch/arm/mach-omap2/powerdomains34xx.h >b/arch/arm/mach-omap2/powerdomains34xx.h >index 4dcf94b..aa557b2 100644 >--- a/arch/arm/mach-omap2/powerdomains34xx.h >+++ b/arch/arm/mach-omap2/powerdomains34xx.h >@@ -338,7 +338,13 @@ static struct powerdomain usbhost_pwrdm = { > .sleepdep_srcs = dss_per_usbhost_sleepdeps, > .pwrsts = PWRSTS_OFF_RET_ON, > .pwrsts_logic_ret = PWRDM_POWER_RET, >- .flags = PWRDM_HAS_HDWR_SAR, /* for USBHOST >ctrlr only */ >+ /* >+ * REVISIT: Enabling usb host save and restore >mechanism seems to >+ * leave the usb host domain permanently in ACTIVE mode after >+ * changing the usb host power domain state from OFF to >active once. >+ * Disabling for now. >+ */ >+ /*.flags = PWRDM_HAS_HDWR_SAR,*/ /* for >USBHOST ctrlr only */ > .banks = 1, > .pwrsts_mem_ret = { > [0] = PWRDM_POWER_RET, /* MEMRETSTATE */ >-- >1.5.4.3 > >-- >To unsubscribe from this list: send the line "unsubscribe >linux-omap" in >the body of a message to majord...@vger.kernel.org >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 majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
