On 17:40-20130301, Santosh Shilimkar wrote: > In addition to the standard power-management technique, the OMAP5 > MPU subsystem also employs an SR3-APG (mercury) power management > technology to reduce leakage. Mercury fast is employed here - might be good to note that. > > It allows for full logic and memories retention on MPU_C0 and MPU_C1 and > is controlled by the PRCM_MPU. > > Signed-off-by: Santosh Shilimkar <[email protected]> > --- > arch/arm/mach-omap2/omap-mpuss-lowpower.c | 17 +++++++++++++++++ > 1 file changed, 17 insertions(+) > > diff --git a/arch/arm/mach-omap2/omap-mpuss-lowpower.c > b/arch/arm/mach-omap2/omap-mpuss-lowpower.c > index bcd2efb..9fda96b 100644 > --- a/arch/arm/mach-omap2/omap-mpuss-lowpower.c > +++ b/arch/arm/mach-omap2/omap-mpuss-lowpower.c > @@ -360,6 +360,20 @@ int __cpuinit omap4_hotplug_cpu(unsigned int cpu, > unsigned int power_state) > > > /* > + * Enable Mercury Fast HG retention mode by default. > + */ > +static void enable_mercury_retention_mode(void) > +{ > + u32 reg; > + > + reg = omap4_prcm_mpu_read_inst_reg(OMAP54XX_PRCM_MPU_DEVICE_INST, > + OMAP54XX_PRCM_MPU_PRM_PSCON_COUNT_OFFSET); > + reg |= BIT(24) | BIT(25); Can we please use macros here? we are setting BIT(25) - fast ramp-up (Mercury fast) Vs 0 (which would have been mercury slow) BIT(24) is mercury enable basically. OMAP4 prm-regbits-44xx.h did not have these ofcourse, so might be a different bit file or so? > + omap4_prcm_mpu_write_inst_reg(reg, OMAP54XX_PRCM_MPU_DEVICE_INST, > + OMAP54XX_PRCM_MPU_PRM_PSCON_COUNT_OFFSET); > +} > + > +/* > * Initialise OMAP4 MPUSS > */ > int __init omap4_mpuss_init(void) > @@ -438,6 +452,9 @@ int __init omap4_mpuss_init(void) > cpu_context_offset = OMAP54XX_RM_CPU0_CPU0_CONTEXT_OFFSET; > } > > + if (soc_is_omap54xx()) > + enable_mercury_retention_mode(); > + > return 0; > } > > -- > 1.7.9.5 > > > _______________________________________________ > linux-arm-kernel mailing list > [email protected] > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
-- Regards, Nishanth Menon -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
