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Message-ID: <20161214182040.GA5292@kozik-lap>
Date: Wed, 14 Dec 2016 20:20:40 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Javier Martinez Canillas <javier@....samsung.com>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
Krzysztof Kozlowski <krzk@...nel.org>,
Kukjin Kim <kgene@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Russell King <linux@...linux.org.uk>,
Doug Anderson <dianders@...omium.org>,
Andreas Faerber <afaerber@...e.de>,
Thomas Abraham <thomas.ab@...sung.com>,
Ben Gamari <ben@...rt-cactus.org>,
linux-samsung-soc@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-pm@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: dts: Add missing CPU frequencies for Exynos5422/5800
On Tue, Dec 13, 2016 at 04:18:05PM -0300, Javier Martinez Canillas wrote:
> Hello Bartlomiej,
>
> On 12/13/2016 01:52 PM, Bartlomiej Zolnierkiewicz wrote:
> > Add missing 2000MHz & 1900MHz OPPs (for A15 cores) and 1400MHz OPP
> > (for A7 cores). Also update common Odroid-XU3 Lite/XU3/XU4 thermal
> > cooling maps to account for new OPPs.
> >
> > Since new OPPs are not available on all Exynos5422/5800 boards modify
> > dts files for Odroid-XU3 Lite (limited to 1.8 GHz / 1.3 GHz) & Peach
> > Pi (limited to 2.0 GHz / 1.3 GHz) accordingly.
> >
> > Tested on Odroid-XU3 and XU3 Lite.
> >
> > Cc: Doug Anderson <dianders@...omium.org>
> > Cc: Javier Martinez Canillas <javier@....samsung.com>
> > Cc: Andreas Faerber <afaerber@...e.de>
> > Cc: Thomas Abraham <thomas.ab@...sung.com>
> > Cc: Ben Gamari <ben@...rt-cactus.org>
> > Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
> > ---
> > arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi | 14 +++++++-------
> > arch/arm/boot/dts/exynos5422-odroidxu3-lite.dts | 17 +++++++++++++++++
> > arch/arm/boot/dts/exynos5800-peach-pi.dts | 4 ++++
> > arch/arm/boot/dts/exynos5800.dtsi | 15 +++++++++++++++
> > 4 files changed, 43 insertions(+), 7 deletions(-)
> >
> > Index: b/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
> > ===================================================================
> > --- a/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi 2016-12-13 15:59:33.779763261 +0100
> > +++ b/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi 2016-12-13 15:59:33.775763261 +0100
> > @@ -118,7 +118,7 @@
> > /*
> > * When reaching cpu_alert3, reduce CPU
> > * by 2 steps. On Exynos5422/5800 that would
> > - * be: 1600 MHz and 1100 MHz.
> > + * (usually) be: 1800 MHz and 1200 MHz.
> > */
> > map3 {
> > trip = <&cpu_alert3>;
> > @@ -131,16 +131,16 @@
> >
> > /*
> > * When reaching cpu_alert4, reduce CPU
> > - * further, down to 600 MHz (11 steps for big,
> > - * 7 steps for LITTLE).
> > + * further, down to 600 MHz (13 steps for big,
> > + * 8 steps for LITTLE).
> > */
> > - map5 {
> > + cooling_map5: map5 {
> > trip = <&cpu_alert4>;
> > - cooling-device = <&cpu0 3 7>;
> > + cooling-device = <&cpu0 3 8>;
> > };
> > - map6 {
> > + cooling_map6: map6 {
> > trip = <&cpu_alert4>;
> > - cooling-device = <&cpu4 3 11>;
> > + cooling-device = <&cpu4 3 13>;
> > };
> > };
> > };
> > Index: b/arch/arm/boot/dts/exynos5422-odroidxu3-lite.dts
> > ===================================================================
> > --- a/arch/arm/boot/dts/exynos5422-odroidxu3-lite.dts 2016-12-13 15:59:33.779763261 +0100
> > +++ b/arch/arm/boot/dts/exynos5422-odroidxu3-lite.dts 2016-12-13 15:59:33.775763261 +0100
> > @@ -21,6 +21,23 @@
> > compatible = "hardkernel,odroid-xu3-lite", "samsung,exynos5800", "samsung,exynos5";
> > };
> >
> > +&cluster_a15_opp_table {
> > + /delete-node/opp@...0000000;
> > + /delete-node/opp@...0000000;
> > +};
> > +
> > +&cluster_a7_opp_table {
> > + /delete-node/opp@...0000000;
> > +};
> > +
>
> I think that a comment in the DTS why these operating points aren't available
> in this board will make more clear why the nodes are being deleted.
>
> > +&cooling_map5 {
> > + cooling-device = <&cpu0 3 7>;
> > +};
> > +
> > +&cooling_map6 {
> > + cooling-device = <&cpu4 3 11>;
> > +};
> > +
> > &pwm {
> > /*
> > * PWM 0 -- fan
> > Index: b/arch/arm/boot/dts/exynos5800-peach-pi.dts
> > ===================================================================
> > --- a/arch/arm/boot/dts/exynos5800-peach-pi.dts 2016-12-13 15:59:33.779763261 +0100
> > +++ b/arch/arm/boot/dts/exynos5800-peach-pi.dts 2016-12-13 15:59:33.779763261 +0100
> > @@ -146,6 +146,10 @@
> > vdd-supply = <&ldo9_reg>;
> > };
> >
> > +&cluster_a7_opp_table {
> > + /delete-property/opp@...0000000;
> > +};
> > +
> > &cpu0 {
> > cpu-supply = <&buck2_reg>;
> > };
> > Index: b/arch/arm/boot/dts/exynos5800.dtsi
> > ===================================================================
> > --- a/arch/arm/boot/dts/exynos5800.dtsi 2016-12-13 15:59:33.779763261 +0100
> > +++ b/arch/arm/boot/dts/exynos5800.dtsi 2016-12-13 15:59:33.779763261 +0100
> > @@ -24,6 +24,16 @@
> > };
> >
> > &cluster_a15_opp_table {
> > + opp@...0000000 {
> > + opp-hz = /bits/ 64 <2000000000>;
> > + opp-microvolt = <1250000>;
> > + clock-latency-ns = <140000>;
> > + };
> > + opp@...0000000 {
> > + opp-hz = /bits/ 64 <1900000000>;
> > + opp-microvolt = <1250000>;
> > + clock-latency-ns = <140000>;
> > + };
> > opp@...0000000 {
> > opp-microvolt = <1250000>;
> > };
> > @@ -85,6 +95,11 @@
> > };
> >
>
> AFAIK Thomas restricted the maximum OPP, because for A15 freqs > 1.8GHz the
> INT rail would need to be scaled up as well since there's a maximum voltage
> difference between the ARM and INT rails before the system becomes unstable:
>
> http://lists.infradead.org/pipermail/linux-arm-kernel/2014-July/276766.html
> https://lkml.org/lkml/2014/5/2/419
The choice of skipping > 1.8 GHz could be also made because of missing
ASV which is important to detect the BIN2 of Exynos5422. The BIN2 is
capped to 1.8/1.3.
Anyway this shouldn't be limiting us now because we have all data
statically coded in DTS - in mainline boards, only Odroid XU3-lite
uses BIN2.
Beside comments from Javier, I would be happy to see high frequencies
Tested-by on Peach Pi/Pit. AFAIR, we did not have these in SRPOL. :)
Best regards,
Krzysztof
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