Hi,
On Thu, Jan 8, 2015 at 6:21 AM, Iain Paton ipat...@gmail.com wrote:
On 24/12/14 15:29, wens Tsai wrote:
- AXP20x (PEK and docs) series, originally by Carlo, posted v8
- AXP20x regulator driver cleanup, finished and tested
- AXP221 support, originally by Boris, finished and tested
* Also enables WiFi on the Hummingbird A31
- sunxi (sun[457]i) cpufreq support, finished and testing (CB/CB2 tested)
* Only added support for the boards I own. It's just a matter of adding
the regulator nodes with the proper constraints
Hi,
I've been testing your patches with a20 olinuxino lime2 a10 lime
I notice your cpu opp data reduces the voltage down to 0.9v for the lowest
frequency, but all of the regulator nodes you added for cubieboard cubietruck
etc, have the lower limit set to 1v. Did you test 0.9v on anything?
Not before. The assumption was that we provide a generic set of OPPs.
Board files then decide which ones are actually usable via regulator
constraints.
The lime2 dts currently has 0.7v as the lower limit for dcdc2 and when it's
dropped to an opp with cpu core voltage set to 0.9v the board starts crashing
randomly very soon after.
I just tested my cubieboard2, and it crashes as soon as the voltage
is lowered to 0.9v by cpufrequtils.
0.9v is below the recommended voltage range for VDD-CPU, according to
the datasheet. Running my board at 144 MHz / 1.0v seems fine though.
I'll post a patch shortly to raise the lime2 dcdc2 lower limit to 1v, but
I think it's probably worth collecting some more data on how many boards
will really be able to use that 0.9v setting.
I can increase the voltage setting for 144 MHz to 1.0v in the dtsi.
This brings out additional problems though. The clock driver doesn't
support re-calculating the dividers ATM. So when the cpu clock is
at 144 MHz, the ahb clocks run at 24 MHz, which IIRC is too slow for
USB.
Maybe I just remove it from the OPP set for the time being.
With the exception of altering the dcdc2 limits, I've not encountered any
other problems.
Thanks for the feedback!
ChenYu
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