On Sat, Sep 29, 2018 at 03:18:30PM +0200, jorik@xxxxxxxxxxxxxx wrote: > From: Jorik Jonker <jorik@xxxxxxxxxxxxxx> > > The Orange Pi Plus board lacks voltage scaling capabilities in its > current form. This results in random freezes during boot when cpufreq is > enabled, probably due to wrong voltages. > > This patch (more or less copy/paste from 06139c) does the following > things on this board: > - enable r_i2c > - add sy8106a to the r_i2c bus > - have the sy8106a regulate VDD of cpu > > Since the Orange Pi Plus has the same PMU setup as the Orange Pi PC, I > simply took min/max/fixed/ramp from the latter DTS. In that file the > origin of the values are described by the following comment: > > "The datasheet uses 1.1V as the minimum value of VDD-CPUX, > however both the Armbian DVFS table and the official one > have operating points with voltage under 1.1V, and both > DVFS table are known to work properly at the lowest > operating point. > Use 1.0V as the minimum voltage instead." > > I have tested this on patch two Orange Pi Plus boards, by running a > kernel with this patch and do intermettent runs of cpuburn while > monitoring voltage, frequency and temperature. The board runs stable > across its operatiing points while showing a reasonable (< 40C) > temperature. My Orange Pi PC, when put to the same test, yields similar > stable results. > > Signed-off-by: Jorik Jonker <jorik@xxxxxxxxxxxxxx> Queued for 4.21, thanks! Maxime -- Maxime Ripard, Bootlin Embedded Linux and Kernel engineering https://bootlin.com
Attachment:
signature.asc
Description: PGP signature
