linux-kernel - Re: [PATCH 1/1] drm/mediatek: Fix errors when reporting rotation capability

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Message-ID: <7c3a6f368c963a53f52ecd9e549a39ec47ebd7df.camel@mediatek.com>
Date:   Thu, 26 Oct 2023 08:29:37 +0000
From:   CK Hu (胡俊光) <ck.hu@...iatek.com>
To:     Shawn Sung (宋孝謙) 
        <Shawn.Sung@...iatek.com>,
        "angelogioacchino.delregno@...labora.com" 
        <angelogioacchino.delregno@...labora.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "daniel@...ll.ch" <daniel@...ll.ch>,
        "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
        "seanpaul@...omium.org" <seanpaul@...omium.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "airlied@...il.com" <airlied@...il.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>
Subject: Re: [PATCH 1/1] drm/mediatek: Fix errors when reporting rotation
 capability

Hi, Hsiao-chien:

On Thu, 2023-10-26 at 08:27 +0000, Shawn Sung (宋孝謙) wrote:
> Hi CK,
> 
> On Thu, 2023-10-26 at 01:53 +0000, CK Hu (胡俊光) wrote:
> > Hi, Hsiao-chien:
> > 
> > On Mon, 2023-09-18 at 15:10 +0800, Hsiao Chien Sung wrote:
> > > For CRTCs that doesn't support rotation should still return
> > > DRM_MODE_ROTATE_0. Since both OVL and OVL adaptor on MTK chip
> > > doesn't support rotation, return the capability of the
> > > hardware accordingly.
> > > 
> > > Fixes: df4444577118 ("drm/mediatek: Support 180 degree rotation")
> > > Fixes: 84d805753983 ("drm/mediatek: Support reflect-y plane
> > > rotation")
> > > 
> > > Signed-off-by: Hsiao Chien Sung <shawn.sung@...iatek.com>
> > > ---
> > >  drivers/gpu/drm/mediatek/mtk_disp_drv.h         | 1 +
> > >  drivers/gpu/drm/mediatek/mtk_disp_ovl.c         | 8 +-------
> > >  drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c | 5 +++++
> > >  drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c     | 1 +
> > >  drivers/gpu/drm/mediatek/mtk_drm_plane.c        | 2 +-
> > >  5 files changed, 9 insertions(+), 8 deletions(-)
> > > 
> > > diff --git a/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> > > b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> > > index 2254038519e1..f4c7dba8f73d 100644
> > > --- a/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> > > +++ b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> > > @@ -120,6 +120,7 @@ void
> > > mtk_ovl_adaptor_register_vblank_cb(struct
> > > device *dev, void (*vblank_cb)(vo
> > >  void mtk_ovl_adaptor_unregister_vblank_cb(struct device *dev);
> > >  void mtk_ovl_adaptor_enable_vblank(struct device *dev);
> > >  void mtk_ovl_adaptor_disable_vblank(struct device *dev);
> > > +unsigned int mtk_ovl_adaptor_supported_rotations(struct device
> > > *dev);
> > >  void mtk_ovl_adaptor_start(struct device *dev);
> > >  void mtk_ovl_adaptor_stop(struct device *dev);
> > >  unsigned int mtk_ovl_adaptor_layer_nr(struct device *dev);
> > > diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> > > b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> > > index 2bffe4245466..5fd1f6ae41f3 100644
> > > --- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> > > +++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> > > @@ -288,8 +288,7 @@ unsigned int mtk_ovl_layer_nr(struct device
> > > *dev)
> > > 
> > >  unsigned int mtk_ovl_supported_rotations(struct device *dev)
> > >  {
> > > -	return DRM_MODE_ROTATE_0 | DRM_MODE_ROTATE_180 |
> > > -	       DRM_MODE_REFLECT_X | DRM_MODE_REFLECT_Y;
> > > +	return DRM_MODE_ROTATE_0 | DRM_MODE_REFLECT_X |
> > > DRM_MODE_REFLECT_Y;
> > 
> > If ovl enable reflect_x and reflect_y at the same time, it is
> > rotate
> > 180, right?
> > 
> > Regards,
> > CK
> 
> Yes, if the user do such an operation, the result is equal to 180
> degrees rotation.

So ovl support rotate 180, why do you remove this capability?

> 
> Regards,
> Shawn