Re: [PATCH v2] arm64: dts: rockchip: Remove overdrive-mode OPPs from RK3588J SoC dtsi
From: Quentin Schulz
Date: Wed Mar 26 2025 - 06:08:04 EST
Hi Dragan,
On 3/24/25 12:00 PM, Dragan Simic wrote:
The differences in the vendor-approved CPU and GPU OPPs for the standard
Rockchip RK3588 variant [1] and the industrial Rockchip RK3588J variant [2]
come from the latter, presumably, supporting an extended temperature range
that's usually associated with industrial applications, despite the two SoC
variant datasheets specifying the same upper limit for the allowed ambient
temperature for both variants. However, the lower temperature limit is
specified much lower for the RK3588J variant. [1][2]
To be on the safe side and to ensure maximum longevity of the RK3588J SoCs,
only the CPU and GPU OPPs that are declared by the vendor to be always safe
for this SoC variant may be provided. As explained by the vendor [3] and
according to the RK3588J datasheet, [2] higher-frequency/higher-voltage
CPU and GPU OPPs can be used as well, but at the risk of reducing the SoC
lifetime expectancy. Presumably, using the higher OPPs may be safe only
when not enjoying the assumed extended temperature range that the RK3588J,
as an SoC variant targeted specifically at higher-temperature, industrial
applications, is made (or binned) for.
Anyone able to keep their RK3588J-based board outside the above-presumed
extended temperature range at all times, and willing to take the associated
risk of possibly reducing the SoC lifetime expectancy, is free to apply
a DT overlay that adds the higher CPU and GPU OPPs.
With all this and the downstream RK3588(J) DT definitions [4][5] in mind,
let's delete the RK3588J CPU and GPU OPPs that are not considered belonging
to the normal operation mode for this SoC variant. To quote the RK3588J
datasheet [2], "normal mode means the chipset works under safety voltage
and frequency; for the industrial environment, highly recommend to keep in
FYI, the answer from Rockchip support about what "industrial
environment" means is:
"""
Industrial environments encompass a wide range of settings, from
manufacturing plants to chemical processing facilities. These
environments are characterized by the use of complex machinery,
stringent safety protocols, and the need for continuous operations.
"""
which is not really helping me understand when we should be able to use
the overdrive mode.
Why would you buy an RK3588J variant if you don't plan on using them on
the -40 - -20°C range that isn't supported by the RK3588 variant, which
seems to me to be the only advertised difference?
It also seems like the RK3588M supports the same operating range as the
RK3588J but at faster speeds? c.f.
https://en.t-firefly.com/product/industry/aio3588mq#spec and
https://download.t-firefly.com/%E4%BA%A7%E5%93%81%E8%A7%84%E6%A0%BC%E6%96%87%E6%A1%A3/%E6%A0%B8%E5%BF%83%E6%9D%BF/iCore-3588MQ%20-%20Automotive-Grade%20AI%20Core%20Board.pdf
Couldn't find a datasheet though.
Talk about confusing specs...
I'll stop caring from now about this very topic :)
Cheers,
Quentin