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Ansuel Smith 5ab9c0b388 ipq806x: fix bug in L2 cache scaling
It has been notice a buf in L2 cache scaling where the scaling is not
done proprely if the frequency is set to the initial state before
the new frequency.

From: https://patchwork.kernel.org/patch/10565443/

* The clocks are set to aux clock rate first to make sure the
* secondary mux is not sourcing off of QSB. The rate is then set to
* two different rates to force a HFPLL reinit under all
* circumstances.

In the initial stage of boot to force a new frequency to apply, is
needed to first set the frequency back to the lowest one (aux_rate)
and then to the target one. This force and make sure the controller
actually switch the frequency to the right one. Apply the same
mechanism to L2 frequency scaling. Before scaling to the target
frequency, first set the frequency to the aux_rate to force the
transition, then scale it to the target frequency. Doing the wrong way
can produce unexpected results and could lock the scaling mechanism
until a full reboot is done (Causing a full reset by the krait-cc driver)

From: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=77612720a2362230af726baa4149c40ec7a7fb05

When the Hfplls are reprogrammed during the rate change,
the primary muxes which are sourced from the same hfpll
for higher frequencies, needs to be switched to the 'safe
secondary mux' as the parent for that small window. This
is done by registering a clk notifier for the muxes and
switching to the safe parent in the PRE_RATE_CHANGE notifier
and back to the original parent in the POST_RATE_CHANGE notifier.

This should apply also to L2 scaling... as we can't relly use
the notifier, we manually do this on L2 scaling.

Tested-by: Stefan Lippers-Hollmann <s.l-h@gmx.de> [nbg6817/ipq8065]
Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
2019-12-26 08:31:41 +01:00
.github build: Update README & github help 2018-07-08 09:41:53 +01:00
config libcxx: Depenency fixes 2019-12-23 12:08:23 +01:00
include kernel: bump 4.9 to 4.9.207 2019-12-24 18:04:32 +01:00
package wireguard: bump to 20191219 2019-12-24 20:53:32 +00:00
scripts scripts/dowload.pl: add archive.apache.org to apache mirror list 2019-12-23 00:21:46 +01:00
target ipq806x: fix bug in L2 cache scaling 2019-12-26 08:31:41 +01:00
toolchain toolchain/gcc: Backport patch to fix unconditional MULTIARCH_DIRNAME 2019-12-23 00:04:18 +01:00
tools tools: qemu: Add patches to support adapter_type and monolithicFlat 2019-12-23 00:22:06 +01:00
.gitattributes add .gitattributes to prevent the git autocrlf option from messing with CRLF/LF in files 2012-05-08 13:30:49 +00:00
.gitignore gitignore: ignore patches in OpenWrt root directory 2019-11-06 00:27:55 +01:00
BSDmakefile add missing copyright header 2007-02-26 01:05:09 +00:00
Config.in merge: base: update base-files and basic config 2017-12-08 19:41:18 +01:00
feeds.conf.default feeds: switch git.lede-project.org URLs to git.openwrt.org 2018-01-16 16:59:22 +01:00
LICENSE finally move buildroot-ng to trunk 2016-03-20 17:29:15 +01:00
Makefile build: add buildinfo as single Makefile target 2019-10-17 14:01:33 +02:00
README build: switch to Python 3 2019-07-26 08:09:16 +02:00
rules.mk rules.mk: remove "$(STAGING_DIR)/include" 2019-11-02 20:51:56 +01:00

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