RE: [PATCH V2 00/10] clk: imx: fixes and improve for i.MX8M

[Peng Fan]

Hi Shawn,

> Subject: [PATCH V2 00/10] clk: imx: fixes and improve for i.MX8M

Is it possible for you to take this patchset for 5.7?

Currently the i.MX8M cpu clock has some dependency on U-Boot settings,
When uboot has different settings, the kernel will hang.
With this patchset, it will not, at least I tested on i.MX8MM-EVK with your
lastest for-next branch.

Thanks,
Peng.

> 
> From: Peng Fan <peng.fan@xxxxxxx>
> 
> Patches based on for-next
> 
> V2:
>  Patch 7, drop wait after write, add one line comment for write twice
> 
> V1:
> Patch 1,2 is to fix the lockdep warning reported by Leonard Patch 3 is to fix pll
> mux bit Patch 4 is align with other i.MX8M using gate Patch 5 is to simplify
> i.MX8MP clk root using composite
> 
> Patch 3~5 is actually https://patchwork.kernel.org/patch/11402761/
> with a minimal change to patch 5 here.
> 
> Patch 6 is to use composite core clk for A53 clk root Patch 7,8,9 is actually to
> fix CORE/BUS clk slice issue.
>  This issue is triggerred after we update U-Boot to include  the A53 clk fixes
> to sources from PLL, not from A53 root clk,  because of the signoff timing is
> 1GHz. U-Boot set the A53 root  mux to 2, sys pll2 500MHz. Kernel will set
> the A53 root mux to  4, sys pll1 800MHz, then gate off sys pll2 500MHz. Then
> kernel  will gate off A53 root because clk_ignore_unsed, A53 directly sources
> PLL, so it is ok to gate off A53 root. However when gate off A53  root clk,
> system hang, because the original mux sys pll2 500MHz  gated off with
> CLK_OPS_PARENT_ENABLE flag.
> 
>  It is lucky that we not met issue for other core/bus clk slice  except A53
> ROOT core slice. But it is always triggerred after  U-Boot and Linux both
> switch to use ARM PLL for A53 core, but  have different mux settings for A53
> root clk slice.
> 
>  So the three patches is to address this issue.
> 
> Patch 10 is make memrepair as critical.
> 
> Peng Fan (10):
>   arm64: dts: imx8m: assign clocks for A53
>   clk: imx8m: drop clk_hw_set_parent for A53
>   clk: imx: imx8mp: fix pll mux bit
>   clk: imx8mp: Define gates for pll1/2 fixed dividers
>   clk: imx8mp: use imx8m_clk_hw_composite_core to simplify code
>   clk: imx8m: migrate A53 clk root to use composite core
>   clk: imx: add mux ops for i.MX8M composite clk
>   clk: imx: add imx8m_clk_hw_composite_bus
>   clk: imx: use imx8m_clk_hw_composite_bus for i.MX8M bus clk slice
>   clk: imx8mp: mark memrepair clock as critical
> 
>  arch/arm64/boot/dts/freescale/imx8mm.dtsi |  10 +-
> arch/arm64/boot/dts/freescale/imx8mn.dtsi |  10 +-
> arch/arm64/boot/dts/freescale/imx8mp.dtsi |  11 ++-
>  arch/arm64/boot/dts/freescale/imx8mq.dtsi |   9 +-
>  drivers/clk/imx/clk-composite-8m.c        |  67 ++++++++++++-
>  drivers/clk/imx/clk-imx8mm.c              |  27 +++---
>  drivers/clk/imx/clk-imx8mn.c              |  25 +++--
>  drivers/clk/imx/clk-imx8mp.c              | 150
> +++++++++++++++---------------
>  drivers/clk/imx/clk-imx8mq.c              |  29 +++---
>  drivers/clk/imx/clk.h                     |   7 ++
>  include/dt-bindings/clock/imx8mp-clock.h  |  28 +++++-
>  11 files changed, 240 insertions(+), 133 deletions(-)
> 
> --
> 2.16.4