Tero Kristo wrote: > From: Tero Kristo <tero.kristo@xxxxxxxxx> > > Due to OMAP3 errata XYZ, the save of the last pad register (ETK_D14 and XYZ is 1.157 > ETK_D15) can fail sometimes when there is simultaneous OCP access to the > SCM register area. Fixed by writing the last register to the save area. > > Also, optimized the delay loop for the HW save to include an udelay(1), > which limits the number of unnecessary HW accesses to SCM register area > during the save. > > Signed-off-by: Tero Kristo <tero.kristo@xxxxxxxxx> > --- > arch/arm/mach-omap2/pm34xx.c | 10 +++++++++- > 1 files changed, 9 insertions(+), 1 deletions(-) > > diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c > index 4b01303..4ead40e 100644 > --- a/arch/arm/mach-omap2/pm34xx.c > +++ b/arch/arm/mach-omap2/pm34xx.c > @@ -155,7 +155,15 @@ static void omap3_core_save_context(void) > /* wait for the save to complete */ > while (!(omap_ctrl_readl(OMAP343X_CONTROL_GENERAL_PURPOSE_STATUS) > & PADCONF_SAVE_DONE)) > - ; > + udelay(1); > + > + /* > + * Force write last pad into memory, as this can fail in some > + * cases according to errata XYZ And here too. > + */ > + omap_ctrl_writel(omap_ctrl_readl(OMAP343X_PADCONF_ETK_D14), > + OMAP343X_CONTROL_MEM_WKUP + 0x2a0); > + > /* Save the Interrupt controller context */ > omap_intc_save_context(); > /* Save the GPMC context */ > -- > 1.5.4.3 > -- 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
