From mboxrd@z Thu Jan 1 00:00:00 1970 From: megous@megous.com (=?UTF-8?Q?Ond=c5=99ej_Jirman?=) Date: Thu, 30 Jun 2016 17:53:08 +0200 Subject: [linux-sunxi] [PATCH v2 14/14] ARM: dts: sun8i: Enable DVFS on Orange Pi One In-Reply-To: References: <20160625034511.7966-1-megous@megous.com> <20160625034511.7966-15-megous@megous.com> <834b8045-d99f-74a3-0353-aa84b897351d@megous.com> Message-ID: <38956591-a53e-e277-4074-c2e0272e2d8d@megous.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 30.6.2016 17:50, Michal Suchanek wrote: > On 30 June 2016 at 17:16, Michal Suchanek wrote: >> On 30 June 2016 at 16:19, Ond?ej Jirman wrote: >>> Hello, >>> >>> On 30.6.2016 13:13, Michal Suchanek wrote: >>>> Hello, >>>> >>>> On 25 June 2016 at 05:45, wrote: >>>>> From: Ondrej Jirman >>>>> >>>>> Use Xulong Orange Pi One GPIO based regulator for >>>>> passive cooling and thermal management. >>>>> >>>>> Signed-off-by: Ondrej Jirman >>>>> --- >>>>> arch/arm/boot/dts/sun8i-h3-orangepi-one.dts | 39 +++++++++++++++++++++++++++++ >>>>> 1 file changed, 39 insertions(+) >>>>> >>>>> diff --git a/arch/arm/boot/dts/sun8i-h3-orangepi-one.dts b/arch/arm/boot/dts/sun8i-h3-orangepi-one.dts >>>>> index b1bd6b0..a38d871 100644 >>>>> --- a/arch/arm/boot/dts/sun8i-h3-orangepi-one.dts >>>>> +++ b/arch/arm/boot/dts/sun8i-h3-orangepi-one.dts >>>>> @@ -109,6 +109,45 @@ >>>>> }; >>>>> }; >>>>> >>>>> +&cpu0 { >>>>> + operating-points = < >>>>> + /* kHz uV */ >>>>> + 1296000 1300000 >>>>> + 1200000 1300000 >>>> >>>> First problem is that the board boots at 1008000 which is not listed >>>> and the kernel complains. >>>> >>>> Second problem is that the board locks up during boot with this enabled. >>>> >>>> Do you have some suggestion for alternate configuration to test? >>> >>> Just to verify, did you test with the entire series applied? (especially >>> the PLL1 clk application changes) >> >> Yes, I applied the whole series. >> >>> >>> You may try dropping the highest operating point, it's probably overly >>> optimistic for Orange Pi One. >>> >>> Is the power supply/cable you're using hard enough? >> >> I use a 7 port hub to power the board. It worked with some other small >> devboards. >> >> The cable is some random Chinese USB to power jack adaptor with an >> extra adaptor to fit the Pi socket. It looks ok but I did not test >> this particular combination thoroughly. >> >>> >>> Where during the boot process does it lock up? >> >> Usually sometime around enabling cpufreq before getty starts. >> Different runs and settings give slightly different results. In >> particular adding the 1008000 point seems to make it go further. >> >> Removing all traces of the regulator, cpufreq and thermal I can boot >> pretty much 100% to login prompt. >> >> I don't think the difference between 1GHz and 1.3GHz frequency on the >> core would put much additional stress on the supply but I can try with >> 35W PSU and some alternative cabling to be sure. >> >> I did some more tests and it seems 1008000 at 1.1V is fine but switching >> to 1.3V crashes the board. Even with only the first 1.3V state. Maybe >> there is need for some delay somewhere for the regulator to get >> stable? >> > > Hm, the AW table shows 1008000 at 1.3V as supported state and it indeed > works. So the voltage switching works or does nothing. Can I measure > the regulator output somewhere? Clocking the chip higher does not > work. Regulator output is TP1 on the bottom of the board, next ot the CSI connector. regards, Ondrej > I will try with another PSU later. > > Thanks > > Michal > -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 819 bytes Desc: OpenPGP digital signature URL: