From: swarren@wwwdotorg•org (Stephen Warren)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH V2 1/6] ARM: tegra: add pending SGI checking API
Date: Wed, 05 Dec 2012 15:09:09 -0700 [thread overview]
Message-ID: <50BFC605.3000402@wwwdotorg.org> (raw)
In-Reply-To: <1354701715-24150-2-git-send-email-josephl@nvidia.com>
On 12/05/2012 03:01 AM, Joseph Lo wrote:
> The "powered-down" CPU idle mode of Tegra cut off the vdd_cpu rail, it
> include the power of GIC. That caused the SGI (Software Generated
> Interrupt) been lost. Because the SGI can't wake up the CPU that in
> the "powered-down" CPU idle mode. We need to check if there is any
> pending SGI when go into "powered-down" CPU idle mode. This is important
> especially when applying the coupled cpuidle framework into "power-down"
> cpuidle dirver. Because the coupled cpuidle framework may have the
> chance that misses IPI_SINGLE_FUNC handling sometimes.
>
> For the PPI or SPI, something like the legacy peripheral interrupt. It
> still can be maintained by Tegra legacy interrupt controller. If there
> is any pending PPI or SPI when CPU in "powered-down" CPU idle mode. The
> CPU can be woken up immediately. So we don't need to take care the same
> situation for PPI or SPI.
Is this feature something that can/should be added to the core GIC
driver, rather than something custom in the Tegra code?
Part of the reason I ask is that I'd like to avoid any more:
static void __iomem *distbase = IO_ADDRESS(TEGRA_ARM_INT_DIST_BASE);
since that requires static page tables to be set up, whereas I'd like to
reduce, as much as possible, the set of pages Tegra maps statically.
next prev parent reply other threads:[~2012-12-05 22:09 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-05 10:01 [PATCH V2 0/6] ARM: tegra20: cpuidle: add power-down state Joseph Lo
2012-12-05 10:01 ` [PATCH V2 1/6] ARM: tegra: add pending SGI checking API Joseph Lo
2012-12-05 22:09 ` Stephen Warren [this message]
2012-12-06 7:04 ` Joseph Lo
2012-12-06 18:52 ` Stephen Warren
2012-12-05 10:01 ` [PATCH V2 2/6] ARM: tegra20: cpuidle: add powered-down state for secondary CPU Joseph Lo
2012-12-05 10:50 ` Lorenzo Pieralisi
2012-12-06 8:25 ` Joseph Lo
2012-12-06 18:56 ` Stephen Warren
2013-01-11 7:20 ` Joseph Lo
2013-01-11 12:24 ` Lorenzo Pieralisi
2013-01-15 3:00 ` Joseph Lo
2013-01-15 11:34 ` Lorenzo Pieralisi
2013-01-16 3:17 ` Joseph Lo
2013-01-12 17:33 ` Nicolas Pitre
2012-12-05 22:18 ` Stephen Warren
2012-12-06 7:22 ` Joseph Lo
2012-12-06 18:59 ` Stephen Warren
2012-12-05 10:01 ` [PATCH V2 3/6] ARM: tegra20: clocks: add CPU low-power function into tegra_cpu_car_ops Joseph Lo
2012-12-05 10:01 ` [PATCH V2 4/6] ARM: tegra20: flowctrl: add support for cpu_suspend_enter/exit Joseph Lo
2012-12-05 10:01 ` [PATCH V2 5/6] ARM: tegra20: cpuidle: add powered-down state for CPU0 Joseph Lo
2012-12-05 10:01 ` [PATCH V2 6/6] ARM: tegra20: cpuidle: apply coupled cpuidle for powered-down mode Joseph Lo
2012-12-05 10:01 ` Joseph Lo
2012-12-05 10:10 ` Joseph Lo
2012-12-06 11:03 ` Grant Likely
2012-12-05 10:01 ` Joseph Lo
2012-12-05 10:11 ` Joseph Lo
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