openwrtv4/target/linux/ipq40xx
Christian Lamparter a44d435c1d ipq40xx: fix apss cpu overclocking spam
There's an interaction issue between the clk changes:"
clk: qcom: ipq4019: Add the apss cpu pll divider clock node
clk: qcom: ipq4019: remove fixed clocks and add pll clocks
" and the cpufreq-dt.

cpufreq-dt is now spamming the kernel-log with the following:

[ 1099.190658] cpu cpu0: dev_pm_opp_set_rate: failed to find current OPP
for freq 761142857 (-34)

This only happens on certain devices like the Compex WPJ428
and AVM FritzBox!4040. However, other devices like the Asus
RT-AC58U and Meraki MR33 work just fine.

The issue stem from the fact that all higher CPU-Clocks
are achieved by switching the clock-parent to the P_DDRPLLAPSS
(ddrpllapss). Which is set by Qualcomm's proprietary bootcode
as part of the DDR calibration.

For example, the FB4040 uses 256 MiB Nanya NT5CC128M16IP clocked
at round 533 MHz (ddrpllsdcc = 190285714 Hz).

whereas the 128 MiB Nanya NT5CC64M16GP-DI in the ASUS RT-AC58U is
clocked at a slightly higher 537 MHz ( ddrpllsdcc = 192000000 Hz).

Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
2018-03-14 19:04:51 +01:00
..
base-files ipq40xx: add target 2018-03-14 19:04:50 +01:00
files-4.14/arch/arm/boot/dts ipq40xx: add target 2018-03-14 19:04:50 +01:00
image ipq40xx: add target 2018-03-14 19:04:50 +01:00
patches-4.14 ipq40xx: fix apss cpu overclocking spam 2018-03-14 19:04:51 +01:00
profiles ipq40xx: add target 2018-03-14 19:04:50 +01:00
config-4.14 ipq40xx: add target 2018-03-14 19:04:50 +01:00
Makefile ipq40xx: add target 2018-03-14 19:04:50 +01:00