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

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Message-ID: <AM6PR04MB4966473CEEFA2674576A342C80A50@AM6PR04MB4966.eurprd04.prod.outlook.com>
Date:   Thu, 7 May 2020 06:58:49 +0000
From:   Aisheng Dong <aisheng.dong@....com>
To:     Peng Fan <peng.fan@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        Leonard Crestez <leonard.crestez@....com>,
        Abel Vesa <abel.vesa@....com>
CC:     "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        Anson Huang <anson.huang@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: RE: [PATCH V3 00/10] clk: imx: fixes and improve for i.MX8M

> From: Peng Fan <peng.fan@....com>
> Sent: Thursday, May 7, 2020 1:56 PM
> 
> 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

Good improvement, it's much clear now. 
So also add my tag for Patch 5-9:
Reviewed-by: Dong Aisheng <aisheng.dong@....com>

For patch 10, still has a small question.
See comment in that patch.

Regards
Aisheng

> 
> 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        |  56 ++++++++++-
>  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, 229 insertions(+), 133 deletions(-)
> 
> --
> 2.16.4