linux-kernel - Re: [PATCH V3 00/10] clk: imx: fixes and improve for i.MX8M

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Date:   Wed, 20 May 2020 09:27:59 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     peng.fan@....com
Cc:     s.hauer@...gutronix.de, leonard.crestez@....com, abel.vesa@....com,
        aisheng.dong@....com, kernel@...gutronix.de, festevam@...il.com,
        linux-imx@....com, Anson.Huang@....com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH V3 00/10] clk: imx: fixes and improve for i.MX8M

On Thu, May 07, 2020 at 01:56:09PM +0800, peng.fan@....com wrote:
> From: Peng Fan <peng.fan@....com>
> 
> Patches rebased on for-next
> 
> V3:
>  Add R-b tag for patch 1-6,10
>  Use clk_mux_ops in patch 7, explain more details in commit log
>  Boot test on i.MX8MM/N/MQ/P
> 
> 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

Applied 1 ~ 9, thanks.

>   clk: imx8mp: mark memrepair clock as critical