Re: [PATCH v10 15/24] drm/mediatek: Remove ineffectual power management codes

[Shawn Sung (宋孝謙)]

Hi CK,

On Tue, 2023-10-24 at 09:25 +0000, CK Hu (胡俊光) wrote:
> Hi, Hsiao-chien:
> 
> On Thu, 2023-10-19 at 13:56 +0800, Hsiao Chien Sung wrote:
> > Display modules will be powered on when .atomic_enable(),
> > there is no need to do it again in mtk_crtc_ddp_hw_init().
> > Besides, the DRM devices are created manually when mtk-mmsys
> > is probed and there is no power domain linked to it.
> > 
> > Fixes: 119f5173628a ("drm/mediatek: Add DRM Driver for Mediatek SoC
> > MT8173.")
> > 
> > Signed-off-by: Hsiao Chien Sung <shawn.sung@xxxxxxxxxxxx>
> > ---
> >  drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 18 +++---------------
> >  1 file changed, 3 insertions(+), 15 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> > b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> > index bc4cc75cca18..c7edd80be428 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> > @@ -6,7 +6,6 @@
> >  #include <linux/clk.h>
> >  #include <linux/dma-mapping.h>
> >  #include <linux/mailbox_controller.h>
> > -#include <linux/pm_runtime.h>
> >  #include <linux/soc/mediatek/mtk-cmdq.h>
> >  #include <linux/soc/mediatek/mtk-mmsys.h>
> >  #include <linux/soc/mediatek/mtk-mutex.h>
> > @@ -362,22 +361,16 @@ static int mtk_crtc_ddp_hw_init(struct
> > mtk_drm_crtc *mtk_crtc, struct drm_atomic
> >  		drm_connector_list_iter_end(&conn_iter);
> >  	}
> >  
> > -	ret = pm_runtime_resume_and_get(crtc->dev->dev);
> 
> crtc->dev->dev is mmsys device. In mt8173.dtsi, you could find that
> mmsys has its own power. So I think we should keep this.
> 
> Regards,
> CK

Didn't notice this difference in the dts, thank you for checking.
Will remove this patch in the next version.

Thanks,
Shawn