Hi Kukjin, On 14 May 2012 19:13, Kukjin Kim <kgene.kim@xxxxxxxxxxx> wrote: > On 05/14/12 17:42, Inderpal Singh wrote: >> >> Hi Kukjin, >> >> On 14 May 2012 13:45, Kukjin Kim<kgene.kim@xxxxxxxxxxx> wrote: >>> >>> Inderpal Singh wrote: >>>> >>>> >>>> Upon wake-up, clear the sleep mode set in INFORM1 register. >>>> >>> Is this for wake-up or _really_ software reset? And is this available on >>> all >>> of EXYNOS4 SoCs? >> >> >> This is for soft reboot hang after one cycle of suspend/resume is >> complete. >> And yes this is applicable for all exynos SOCs. >> > Hi, > > As I know, we don't need it for all of EXYNOS SoCs but let me check about > the situation you said with hardware engineer tomorrow. If any updates, let > you know. > The issue happens because u-boot checks INFROM1 register to know if its wake-up from sleep. Hence if INFORM1 is not cleared, the soft reboot after one suspend/resume cycle will be understood by u-boot as wake-up from sleep, so it will try to resume and will hang up. I have faced this issue on Origen, Pegasus SMDK and 5250 SMDK. Thanks, Inder > > Thanks. > > Best regards, > Kgene. > -- > Kukjin Kim <kgene.kim@xxxxxxxxxxx>, Senior Engineer, > SW Solution Development Team, Samsung Electronics Co., Ltd. -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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