Messages in this thread | | | From | Hsin-Yi Wang <> | Date | Wed, 29 May 2019 14:08:17 +0800 | Subject | Re: [PATCH 2/3] drm: mediatek: remove clk_unprepare() in mtk_drm_crtc_destroy() |
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On Wed, May 29, 2019 at 1:58 PM CK Hu <ck.hu@mediatek.com> wrote: > > Hi, Hsin-Yi: > > On Mon, 2019-05-27 at 12:50 +0800, Hsin-Yi Wang wrote: > > There is no clk_prepare() called in mtk_drm_crtc_reset(), when unbinding > > drm device, mtk_drm_crtc_destroy() will be triggered, and the clocks will > > be disabled and unprepared in mtk_crtc_ddp_clk_disable. If clk_unprepare() > > is called here, we'll get warnings[1], so remove clk_unprepare() here. > > In original code, clk_prepare() is called in mtk_drm_crtc_create() and > clk_unprepare() is called in mtk_drm_crtc_destroy(). This looks correct.
clk_prepare() is removed in https://patchwork.kernel.org/patch/10872777/.
> I don't know why we should do any thing about clock in > mtk_drm_crtc_reset(). To debug this, the first step is to print message > when mediatek drm call clk_prepare() and clk_unprepare(). If these two > interface is called in pair, I think we should not modify mediatek drm > driver, the bug maybe in clock driver. >
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