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

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Date:   Thu, 23 Sep 2021 19:58:11 +0800
From:   Yong Wu <yong.wu@...iatek.com>
To:     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>, <yong.wu@...iatek.com>,
        <youlin.pei@...iatek.com>, <anan.sun@...iatek.com>,
        <chao.hao@...iatek.com>, <yen-chang.chen@...iatek.com>
Subject: [PATCH v3 04/33] iommu/mediatek: Remove clk_disable in mtk_iommu_remove

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>
---
 drivers/iommu/mtk_iommu.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 3e8f0164d26c..5c24e8e10a73 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -925,7 +925,6 @@ static int mtk_iommu_remove(struct platform_device *pdev)
 	if (iommu_present(&platform_bus_type))
 		bus_set_iommu(&platform_bus_type, NULL);
 
-	clk_disable_unprepare(data->bclk);
 	device_link_remove(data->smicomm_dev, &pdev->dev);
 	pm_runtime_disable(&pdev->dev);
 	devm_free_irq(&pdev->dev, data->irq, data);
-- 
2.18.0