From: nm@ti.com (Nishanth Menon)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 06/15] ARM: OMAP5: PM: Enable Mercury retention mode on CPUx powerdomains
Date: Mon, 4 Mar 2013 12:33:35 -0600 [thread overview]
Message-ID: <20130304183335.GD14860@kahuna> (raw)
In-Reply-To: <51319383.7090903@ti.com>
On 11:22-20130302, Santosh Shilimkar wrote:
> On Saturday 02 March 2013 01:12 AM, Nishanth Menon wrote:
> > 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.
> Slow is completly descoped from validation and only supported mode
> is mercury fast which was the intention. So lets not add any confusion
> since other state isn't supported.
understood and agreed.
> >>
> >> 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 <santosh.shilimkar@ti.com>
> >> ---
> >> 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?
> As already commented above, only mode supported is mercury fast and
> hence to avoid any further confusion, i have used bit fields.
> In short, to enable the mercury on O5, both bits needs to be set.
> And to avoid any fast/slow confusion, I haven't used macro's.
I see the usage as a slightly better version of:
reg |= 0x3000000
shrug.. Register bit define is slightly better from review perspective.
--
Regards,
Nishanth Menon
next prev parent reply other threads:[~2013-03-04 18:33 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-01 12:10 [PATCH 00/15] ARM: OMAP5: PM: Add MPUSS suspend and CPUidle support Santosh Shilimkar
2013-03-01 12:10 ` [PATCH 01/15] ARM: OMAP4+: PM: Consolidate MPU subsystem PM code for re-use Santosh Shilimkar
2013-03-01 13:50 ` Nishanth Menon
2013-03-01 12:10 ` [PATCH 02/15] ARM: OMAP5: PM: Update CPU context register offset Santosh Shilimkar
2013-03-01 17:34 ` Nishanth Menon
2013-03-01 12:10 ` [PATCH 03/15] ARM: OMAP4+: PM: Consolidate and use OMAP4 PM code for OMAP5 Santosh Shilimkar
2013-03-01 17:43 ` Nishanth Menon
2013-03-02 5:43 ` Santosh Shilimkar
2013-03-04 18:21 ` Nishanth Menon
2013-03-01 12:10 ` [PATCH 04/15] ARM: OMAP5: PM: Set MPUSS-EMIF clock-domain static dependency Santosh Shilimkar
2013-03-01 12:10 ` [PATCH 05/15] ARM: OMAP5: PM: Enables ES2 PM mode by default Santosh Shilimkar
2013-03-01 19:37 ` Nishanth Menon
2013-03-02 5:47 ` Santosh Shilimkar
2013-03-04 18:29 ` Nishanth Menon
2013-03-10 18:07 ` Santosh Shilimkar
2013-03-01 12:10 ` [PATCH 06/15] ARM: OMAP5: PM: Enable Mercury retention mode on CPUx powerdomains Santosh Shilimkar
2013-03-01 19:42 ` Nishanth Menon
2013-03-02 5:52 ` Santosh Shilimkar
2013-03-04 18:33 ` Nishanth Menon [this message]
2013-03-01 12:10 ` [PATCH 07/15] ARM: OMAP5: Add init_late() hook to enable pm initialization Santosh Shilimkar
2013-03-01 20:12 ` Nishanth Menon
2013-03-02 6:00 ` Santosh Shilimkar
2013-03-04 18:35 ` Nishanth Menon
2013-03-01 12:10 ` [PATCH 08/15] ARM: OMAP5: PM: Add CPU power off mode support Santosh Shilimkar
2013-03-01 21:36 ` Nishanth Menon
2013-03-02 6:14 ` Santosh Shilimkar
2013-03-04 18:38 ` Nishanth Menon
2013-03-01 12:10 ` [PATCH 09/15] ARM: OMAP4+: PM: Restore CPU power state to ON with clockdomain force wakeup method Santosh Shilimkar
2013-03-01 21:53 ` Nishanth Menon
2013-03-02 6:16 ` Santosh Shilimkar
2013-03-01 12:10 ` [PATCH 10/15] ARM: OMAP5: PM: Add MPU Open Switch Retention support Santosh Shilimkar
2013-03-01 22:05 ` Nishanth Menon
2013-03-01 12:11 ` [PATCH 11/15] ARM: OMAP5: PM: Add L2 memory power down support Santosh Shilimkar
2013-03-01 23:43 ` Nishanth Menon
2013-03-02 6:24 ` Santosh Shilimkar
2013-03-04 18:41 ` Nishanth Menon
2013-03-01 12:11 ` [PATCH 12/15] ARM: OMAP4+: CPUidle: Cleanup idle driver for OMAP5 support Santosh Shilimkar
2013-03-01 23:56 ` Nishanth Menon
2013-03-02 6:25 ` Santosh Shilimkar
2013-03-01 12:11 ` [PATCH 13/15] ARM: OMAP4+: CPUidle: Deprecate use of omap4_mpuss_read_prev_context_state() Santosh Shilimkar
2013-03-02 0:03 ` Nishanth Menon
2013-03-01 12:11 ` [PATCH 14/15] ARM: OMAP4+: CPUidle: Add OMAP5 idle driver support Santosh Shilimkar
2013-03-02 0:25 ` Nishanth Menon
2013-03-02 6:47 ` Santosh Shilimkar
2013-03-04 18:48 ` Nishanth Menon
2013-03-01 12:11 ` [PATCH 15/15] ARM: OMAP5: PM: handle device instance for for coldreset Santosh Shilimkar
2013-03-01 13:04 ` Nishanth Menon
2013-03-01 13:09 ` Santosh Shilimkar
2013-03-01 13:13 ` Nishanth Menon
2013-03-01 13:16 ` Santosh Shilimkar
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