Message-ID: <6f630d1f-6445-eafa-995b-c38bc23ebc9b@collabora.com>
Date:   Wed, 1 Mar 2023 14:19:04 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Chen-Yu Tsai <wenst@...omium.org>
Cc:     mturquette@...libre.com, sboyd@...nel.org, matthias.bgg@...il.com,
        johnson.wang@...iatek.com, miles.chen@...iatek.com,
        chun-jie.chen@...iatek.com, daniel@...rotopia.org,
        fparent@...libre.com, msp@...libre.com, nfraprado@...labora.com,
        rex-bc.chen@...iatek.com, zhaojh329@...il.com,
        sam.shih@...iatek.com, edward-jw.yang@...iatek.com,
        yangyingliang@...wei.com, granquet@...libre.com,
        pablo.sun@...iatek.com, sean.wang@...iatek.com,
        chen.zhong@...iatek.com, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v5 00/54] MediaTek clocks: full module build and cleanups

Il 23/02/23 11:15, Chen-Yu Tsai ha scritto:
> On Wed, Feb 22, 2023 at 5:25 PM AngeloGioacchino Del Regno
> <angelogioacchino.delregno@...labora.com> wrote:
>>
>> Changes in v5:
>>   - Fixed typo in MODULE_DEVICE_TABLE() for clk-mt8195-vpp0/vpp1
>>
>> Changes in v4:
>>   - Rebased over clk-next branch as of 21/02/2023
>>   - MT8135: Squashed removal of __initconst annotation with conversion
>>     to platform drivers as suggested by Chen-Yu
>>   - MT8135: Added mention of the introduction of the dummy clock in
>>     the commit description of patch [54/54]
>>   - Fixed Kconfig ordering issue for MT8195 IMGSYS dependant option
>>
>> Changes in v3:
>>   - Added conversion to simple_probe for MT8135 clocks
>>   - Reordered added Kconfig options for MT8195, MT8186
>>   - Additional config options for MT8195, MT8186 are now default
>>     enabled if parent COMMON_CLK_MT81{95,86} is enabled
>>   - Added .remove() callback to MT2712 and MT7622 apmixedsys drivers
>>     to avoid resource leakage on unbind/removal
>>   - Dropped unwanted and useless change on mt7629-eth.c
>>
>> Changes in v2:
>>   - Fixed issues on MT8183 (thanks Chen-Yu!)
>>   - Changed builtin_platform_driver() -> module_platform_driver() for
>>     MT8167 vdecsys clocks (as that was a mistake!)
>>   - Some patches were split, some others were reordered
>>   - Summarized: applied changes from Chen-Yu's review
>>
>> This is part 2 of the "MediaTek clocks cleanups and improvements" series,
>> which was already picked.
>>
>> If reading this full cover letter is too boring for you, here's a short
>> summary of the changes of this series:
>>   - Added mtk_clk_pdev_probe() for mtk-mmsys probed clocks;
>>   - Added divider clock support to common probe mechanism;
>>   - Various cleanups here and there;
>>   - Converted most clock drivers to platform_driver;
>>   - MediaTek clocks can now be built as modules.
>>
>> NOTE: Applies on top of [1] and [2].
>>
>>
>> Full blurb:
>>
>> This huge series adds more cleanups on top, reducing size and adding more
>> commonization for clock drivers probe/remove, which also includes a new
>> common probe mechanism for multimedia clock drivers that are usually
>> probed by mtk-mmsys instead of a dt clock node: thanks to this, it was
>> finally possible to convert almost all clock drivers to the common probe
>> mechanism, which *finally again* makes us able to build all these drivers
>> as modules!
>>
>> Since this looked like being *the* way forward, I went on converting some
>> more drivers away from OF_CLK_DECLARE_DRIVER to full platform_driver(s),
>> allowing for more (actually, almost all!) drivers to be built as modules.
>>
>> While at it, I also added some more consistency in macros usage by
>> removing all of the duplicated full macro declaration for MediaTek gate
>> clocks and replacing all of those with using the GATE_MTK macro instead,
>> producing a nice reduction in amount of lines per file but, more
>> importantly, improving readability and eventual future batch changes.
>>
>> This amount of commonization will also, in my opinion, greatly improve
>> the review process for new clock drivers, as they will be mostly just a
>> list of clocks and won't contain much new code, as it's all going to be
>> handled in the common places, which also reduces chances to see new clock
>> driver related bugs emerging on one SoC or the other.
>>
>> Since I don't own devices with all of the supported MediaTek SoCs, I
>> could not test some of the conversions on real hardware... but I am
>> confident that this will work as the drivers are *very* similar on a
>> per-generation basis.
>>
>> This series was build-tested for all (both module and built-in build)
>> and was manually tested on MT6795, MT8173, MT8192, MT8195.
>>
>> [1]: https://patchwork.kernel.org/project/linux-mediatek/list/?series=719067
>> [2]: https://patchwork.kernel.org/project/linux-mediatek/patch/20230207014800.7619-2-moudy.ho@mediatek.com/
>>
>> AngeloGioacchino Del Regno (54):
>>    clk: mediatek: clk-mtk: Switch to device_get_match_data()
>>    clk: mediatek: clk-mtk: Introduce clk_mtk_pdev_{probe,remove}()
>>    clk: mediatek: Migrate to mtk_clk_pdev_probe() for multimedia clocks
>>    clk: mediatek: Add divider clocks to mtk_clk_simple_{probe,remove}()
>>    clk: mediatek: mt2712: Migrate topckgen/mcucfg to
>>      mtk_clk_simple_probe()
>>    clk: mediatek: mt2712: Compress clock arrays entries to 90 columns
>>    clk: mediatek: mt2712: Add error handling to
>>      clk_mt2712_apmixed_probe()
>>    clk: mediatek: mt2712: Move apmixedsys clock driver to its own file
>>    clk: mediatek: mt2712-apmixedsys: Add .remove() callback for module
>>      build
>>    clk: mediatek: mt2712: Change to use module_platform_driver macro
>>    clk: mediatek: mt8365: Move apmixedsys clock driver to its own file
>>    clk: mediatek: mt8365: Convert simple_gate to mtk_gate clocks
>>    clk: mediatek: mt8365: Join top_misc_mux_gates and top_misc_muxes
>>      arrays
>>    clk: mediatek: mt8365: Convert to mtk_clk_simple_{probe,remove}()
>>    clk: mediatek: mt8167: Compress GATE_TOPx macros
>>    clk: mediatek: mt8167: Move apmixedsys as platform_driver in new file
>>    clk: mediatek: mt8167: Remove __initconst annotation from arrays
>>    clk: mediatek: mt8167: Convert to mtk_clk_simple_{probe,remove}()
>>    clk: mediatek: mt8183: Move apmixedsys clock driver to its own file
>>    clk: mediatek: mt8183: Compress clocks arrays entries where possible
>>    clk: mediatek: mt8183: Convert all remaining clocks to common probe
>>    clk: mediatek: Consistently use GATE_MTK() macro
>>    clk: mediatek: mt7622: Properly use CLK_IS_CRITICAL flag
>>    clk: mediatek: mt7622: Move apmixedsys clock driver to its own file
>>    clk: mediatek: mt7622-apmixedsys: Add .remove() callback for module
>>      build
>>    clk: mediatek: mt7622: Move infracfg to clk-mt7622-infracfg.c
>>    clk: mediatek: mt7622: Convert to platform driver and simple probe
>>    clk: mediatek: mt8516: Move apmixedsys clock driver to its own file
>>    clk: mediatek: mt8516: Convert to platform driver and simple probe
>>    clk: mediatek: mt8516: Allow building clock drivers as modules
>>    clk: mediatek: Propagate struct device with
>>      mtk_clk_register_dividers()
>>    clk: mediatek: mt7986-apmixed: Use PLL_AO flag to set critical clock
>>    clk: mediatek: mt7986-infracfg: Migrate to common probe mechanism
>>    clk: mediatek: mt7986-eth: Migrate to common probe mechanism
>>    clk: mediatek: mt8186-mcu: Migrate to common probe mechanism
>>    clk: mediatek: Switch to module_platform_driver() where possible
>>    clk: mediatek: Add MODULE_LICENSE() where missing
>>    clk: mediatek: mt2712: Change Kconfig options to allow module build
>>    clk: mediatek: Split MT8195 clock drivers and allow module build
>>    clk: mediatek: Allow building MT8192 non-critical clocks as modules
>>    clk: mediatek: Allow MT7622 clocks to be built as modules
>>    clk: mediatek: Allow all MT8167 clocks to be built as modules
>>    clk: mediatek: Allow all MT8183 clocks to be built as modules
>>    clk: mediatek: Allow building most MT6765 clock drivers as modules
>>    clk: mediatek: Allow building most MT6797 clock drivers as modules
>>    clk: mediatek: Split configuration options for MT8186 clock drivers
>>    clk: mediatek: mt8192: Move apmixedsys clock driver to its own file
>>    clk: mediatek: Kconfig: Allow module build for core mt8192 clocks
>>    clk: mediatek: Add MODULE_DEVICE_TABLE() where appropriate
>>    clk: mediatek: mt8135: Move apmixedsys to its own file
>>    clk: mediatek: mt8135: Properly use CLK_IS_CRITICAL flag
>>    clk: mediatek: mt8135-apmixedsys: Convert to platform_driver and
>>      module
>>    clk: mediatek: mt8135: Join root_clk_alias and top_divs arrays
>>    clk: mediatek: mt8135: Convert to simple probe and enable module build
> 
> Tested-by: Chen-Yu Tsai <wenst@...omium.org>
> 
> on MT8183, MT8192, MT8195. Unfortunately on MT8186 the patch series causes
> the kernel to freeze during boot. I need to build a verbose kernel to figure
> it out.
> 
> ChenYu

On next-20230301 I can't replicate kernel boot freezes, but there's a crash with
ANX7625 happening with Asurada as well, completely unrelated to this series (as
having it or not having it doesn't change anything, I checked).

I mentioned the unrelated crash to make you aware that it wasn't a full boot.
If what you experienced what an early crash, that shouldn't be the case... I will
give you some more info once I get a fully working kernel again...

Angelo

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