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From: Pavel Machek <pavel@ucw.cz>
To: Tony Lindgren <tony@atomide.com>
Cc: Merlijn Wajer <merlijn@wizzup.org>,
	linux-omap@vger.kernel.org, Sebastian Reichel <sre@kernel.org>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 8/8] ARM: OMAP2+: Initialize voltage controller for omap4
Date: Sun, 13 Oct 2019 17:08:15 +0200	[thread overview]
Message-ID: <20191013150815.GF13278@amd> (raw)
In-Reply-To: <20191010001224.41826-9-tony@atomide.com>


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On Wed 2019-10-09 17:12:24, Tony Lindgren wrote:
> We're missing initializing the PRM_VOLTCTRL register for voltage
> controller. Let's add omap4_vc_init_pmic_signaling() similar to what we
> have for omap3 and enable voltage control for retention.
> 
> This brings down droid4 power consumption with mainline kernel to somewhere
> between 40 and 50mW from about 70 to 80 mW for the whole device when running
> idle with LCD and backlight off, WLAN connected, and USB and modem modules
> unloaded.
> 
> Mostly just rmmod of omap2430, ohci-platform and phy-mapphone-mdm6600 are
> needed to idle USB and shut down the modem. And after that measuring idle
> power consumption can be done with reading sysfs entry every ten seconds for
> /sys/class/power_supply/battery/power_avg. Then rmmod of phy-cpcap-usb will
> save few more mW, but will disable the debug UART.
> 
> Note that sometimes CM_L4PER_UART1_CLKCTRL at 0x4a009540 does not idle
> properly after unloading of phy-mapphone-mdm6600.

Acked-by: Pavel Machek <pavel@ucw.cz>
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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  reply	other threads:[~2019-10-13 15:08 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-10  0:12 [PATCH 0/8] Improve PM for omap4 devices Tony Lindgren
2019-10-10  0:12 ` Tony Lindgren
2019-10-10  0:12 ` [PATCH 1/8] ARM: OMAP2+: Remove unused wakeup_cpu Tony Lindgren
2019-10-10  0:12   ` Tony Lindgren
2019-10-13 11:38   ` Pavel Machek
2019-10-10  0:12 ` [PATCH 2/8] ARM: OMAP2+: Drop bogus wkup domain oswr setting Tony Lindgren
2019-10-10  0:12   ` Tony Lindgren
2019-10-13 15:07   ` Pavel Machek
2019-10-16 14:40     ` Tony Lindgren
2019-10-16 14:40       ` Tony Lindgren
2019-10-10  0:12 ` [PATCH 3/8] ARM: OMAP2+: Remove bogus warnings for machines without twl PMIC Tony Lindgren
2019-10-10  0:12   ` Tony Lindgren
2019-10-10  0:12 ` [PATCH 4/8] ARM: OMAP2+: Update 4430 voltage controller operating points Tony Lindgren
2019-10-10  0:12   ` Tony Lindgren
2019-10-10  0:12 ` [PATCH 5/8] ARM: OMAP2+: Configure voltage controller for cpcap Tony Lindgren
2019-10-10  0:12   ` Tony Lindgren
2019-10-13 14:46   ` Pavel Machek
2019-10-10  0:12 ` [PATCH 6/8] ARM: OMAP2+: Allow per oswr for omap4 Tony Lindgren
2019-10-10  0:12   ` Tony Lindgren
2019-10-10  0:12 ` [PATCH 7/8] ARM: OMAP2+: Allow core " Tony Lindgren
2019-10-10  0:12   ` Tony Lindgren
2019-10-13 15:08   ` Pavel Machek
2019-10-16 14:46     ` Tony Lindgren
2019-10-16 14:46       ` Tony Lindgren
2019-10-10  0:12 ` [PATCH 8/8] ARM: OMAP2+: Initialize voltage controller " Tony Lindgren
2019-10-10  0:12   ` Tony Lindgren
2019-10-13 15:08   ` Pavel Machek [this message]
2019-10-16 14:53   ` Tony Lindgren
2019-10-16 14:53     ` Tony Lindgren
2019-10-17  1:19     ` Tony Lindgren
2019-10-17  1:19       ` Tony Lindgren

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