Hello all,
On 2025-03-13 20:43, Dragan Simic wrote:
On 2025-03-13 20:00, Heiko Stuebner wrote:
Am Donnerstag, 13. März 2025, 11:42:17 MEZ schrieb Dragan Simic:
On 2025-03-12 11:34, Dragan Simic wrote:
Just as a note, everything above (and even a bit more) is confirmed
and clearly described in the publicly available RK3588J datasheet,
which I'll provide as a reference in my upcoming patch.
so just to reiterate my stance, in mainline I really only want
frequencies
that are not possibly influencing the lifetime of the chip.
It doesn't even matter about the variant we're talking about being
industrial :-) . When someone is using mainline I want them to be
reasonable assured that we don't have stuff in here that may affect
the lifetime of their board.
All gambling on performance for possible lifetime reduction people
can do on their own ... for example with a dt-overlay ;-) .
So TL;DR, I agree to both Quentin and Dragan
Thanks! Indeed, we must provide only the OPPs that are declared
by the manufacturer to be always safe for the particular SoC
variant. The RK3588J is actually a good example, because it, in
theory, can run safely at higher OPPs as well, but only when not
enjoying the extended temperature range that the RK3588J, as an
SoC variant targeted at industrial applications, is specifically
made (or binned) for.
Thus, we must support only the RK3588J OPPs that are declared to
be safe throughout the entire extended temperature range, while
anyone who actually can assure that their RK3588J-based board is
never going to run within the extended temperature range, probably
may safely apply an overlay that adds the higher OPPs. As we
obviously can't know what will be the temperature conditions, we
may provide only the lower OPPs that are always safe.
I'll finish the patch and send it over tomorrow or so... I still
need to go through the changes once again, to make 100% sure I've
missed nothing, and that I haven't included anything extraneous. :)
For future reference and for anyone interested, below is the link
to the above-mentioned patch.
https://lore.kernel.org/linux-rockchip/f929da061de35925ea591c969f985430e23c4a7e.1742526811.git.dsimic@xxxxxxxxxxx/T/#u
