Re: [PATCH 11/13] iommu/mediatek: Use builtin_platform_driver

Yong Wu
2019-02-27T14:33:32Z

On Mon, 2019-02-25 at 15:56 -0800, Evan Green wrote:
> On Mon, Dec 31, 2018 at 8:53 PM Yong Wu <yong.wu@mediatek.com> wrote:
> >
> > MediaTek IOMMU should wait for smi larb which need wait for the
> > power domain(mtk-scpsys.c) and the multimedia ccf who both are
> > module init. Thus, subsys_initcall for MediaTek IOMMU is not helpful.
> > Switch to builtin_platform_driver.
> >
> > Meanwhile, the ".remove" can be removed. Move its content to
> > ".shutdown".
> >
> > Signed-off-by: Yong Wu <yong.wu@mediatek.com>
> > ---
> > drivers/iommu/mtk_iommu.c | 23 ++---------------------
> > drivers/iommu/mtk_iommu_v1.c | 16 ++--------------
> > 2 files changed, 4 insertions(+), 35 deletions(-)
> >
> > diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> > index 735ae8d..2798b12 100644
> > --- a/drivers/iommu/mtk_iommu.c
> > +++ b/drivers/iommu/mtk_iommu.c
> > @@ -690,7 +690,7 @@ static int mtk_iommu_probe(struct platform_device *pdev)
> > return component_master_add_with_match(dev, &mtk_iommu_com_ops, match);
> > }
> >
> > -static int mtk_iommu_remove(struct platform_device *pdev)
> > +static void mtk_iommu_shutdown(struct platform_device *pdev)
> > {
> > struct mtk_iommu_data *data = platform_get_drvdata(pdev);
> >
> > @@ -703,12 +703,6 @@ static int mtk_iommu_remove(struct platform_device *pdev)
> > clk_disable_unprepare(data->bclk);
> > devm_free_irq(&pdev->dev, data->irq, data);
> > component_master_del(&pdev->dev, &mtk_iommu_com_ops);
> > - return 0;
> > -}
> > -
> > -static void mtk_iommu_shutdown(struct platform_device *pdev)
> > -{
> > - mtk_iommu_remove(pdev);
>
> Is there a reason all these things are happening in shutdown()? Don't
> we normally just not clean things up and let the machine turn off?
> Normally I'm a big advocate of proper symmetric teardown, so it hurts
> a little to ask.

In this patch I change the driver to builtin driver. I guess the
"_remove" is not helpful now. thus I remove it.

About the shutdown, I don't have a special reason for it. I only want to
mute the m4u log when something go wrong in the shutdown flow.

>
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