linux-kernel - Re: [PATCH v3 04/33] iommu/mediatek: Remove clk_disable in mtk_iommu

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Date:   Tue, 4 Jan 2022 16:55:10 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Yong Wu <yong.wu@...iatek.com>, Joerg Roedel <joro@...tes.org>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Tomasz Figa <tfiga@...omium.org>,
        linux-mediatek@...ts.infradead.org, srv_heupstream@...iatek.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org,
        Hsin-Yi Wang <hsinyi@...omium.org>, youlin.pei@...iatek.com,
        anan.sun@...iatek.com, chao.hao@...iatek.com,
        yen-chang.chen@...iatek.com
Subject: Re: [PATCH v3 04/33] iommu/mediatek: Remove clk_disable in
 mtk_iommu_remove

Il 23/09/21 13:58, Yong Wu ha scritto:
> After the commit b34ea31fe013 ("iommu/mediatek: Always enable the clk on
> resume"), the iommu clock is controlled by the runtime callback.
> thus remove the clk control in the mtk_iommu_remove.
> 
> Otherwise, it will warning like:
> 
> echo 14018000.iommu > /sys/bus/platform/drivers/mtk-iommu/unbind
> 
> [   51.413044] ------------[ cut here ]------------
> [   51.413648] vpp0_smi_iommu already disabled
> [   51.414233] WARNING: CPU: 2 PID: 157 at */v5.15-rc1/kernel/mediatek/
>                            drivers/clk/clk.c:952 clk_core_disable+0xb0/0xb8
> [   51.417174] Hardware name: MT8195V/C(ENG) (DT)
> [   51.418635] pc : clk_core_disable+0xb0/0xb8
> [   51.419177] lr : clk_core_disable+0xb0/0xb8
> ...
> [   51.429375] Call trace:
> [   51.429694]  clk_core_disable+0xb0/0xb8
> [   51.430193]  clk_core_disable_lock+0x24/0x40
> [   51.430745]  clk_disable+0x20/0x30
> [   51.431189]  mtk_iommu_remove+0x58/0x118
> [   51.431705]  platform_remove+0x28/0x60
> [   51.432197]  device_release_driver_internal+0x110/0x1f0
> [   51.432873]  device_driver_detach+0x18/0x28
> [   51.433418]  unbind_store+0xd4/0x108
> [   51.433886]  drv_attr_store+0x24/0x38
> [   51.434363]  sysfs_kf_write+0x40/0x58
> [   51.434843]  kernfs_fop_write_iter+0x164/0x1e0
> 
> Fixes: b34ea31fe013 ("iommu/mediatek: Always enable the clk on resume")
> Reported-by: Hsin-Yi Wang <hsinyi@...omium.org>
> Signed-off-by: Yong Wu <yong.wu@...iatek.com>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>