[PATCH] drm/mediatek: hdmi: Filter interlaced resolutions

[ck.hu@mediatek.com (CK Hu)]

On Wed, 2017-05-24 at 14:24 +0200, Daniel Vetter wrote:
> On Wed, May 24, 2017 at 05:20:45PM +0800, CK Hu wrote:
> > On Tue, 2017-05-23 at 15:12 +0200, Daniel Vetter wrote:
> > > On Tue, May 23, 2017 at 05:28:15PM +0800, CK Hu wrote:
> > > > Hi, Bibby:
> > > > 
> > > > I've applied this patch to my branch mediatek-drm-fixes-4.12-rc1,
> > > > thanks.
> > > > 
> > > > Regards,
> > > > CK
> > > > 
> > > > On Tue, 2017-01-24 at 13:10 +0800, Bibby Hsieh wrote:
> > > > > Current Mediatek DRM driver does not support interlaced mode, and
> > > > > will hang if such resolution is used: Filter those to prevent
> > > > > kernel hangs, until the DRM driver is fixed properly.
> > > > > 
> > > > > Signed-off-by: Bibby Hsieh <bibby.hsieh@mediatek.com>
> > > > > ---
> > > > >  drivers/gpu/drm/mediatek/mtk_hdmi.c | 2 ++
> > > > >  1 file changed, 2 insertions(+)
> > > > > 
> > > > > diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
> > > > > index 0e8c4d9..e33678d 100644
> > > > > --- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
> > > > > +++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
> > > > > @@ -1244,6 +1244,8 @@ static int mtk_hdmi_conn_mode_valid(struct drm_connector *conn,
> > > > >  			return MODE_BAD;
> > > > >  	}
> > > > >  
> > > > > +	if (mode->flags & DRM_MODE_FLAG_INTERLACE)
> > > > > +		return MODE_NO_INTERLACE;
> > > > >  	if (mode->clock < 27000)
> > > > >  		return MODE_CLOCK_LOW;
> > > > >  	if (mode->clock > 297000)
> > > 
> > > You probably want to check out Jose's mode_valid work, since only
> > > filtering in the connector's ->mode_valid callback isn't enough. You also
> > > need to filter in ->mode_fixup (or some other place called at atomic_check
> > > time).
> > > -Daniel
> > 
> > Hi, Daniel:
> > 
> > Yes, I still need to filter in ->mode_fixup.
> > 
> > Hi, Bibby:
> > 
> > Because Jose's work plan to use mode_valid to replace mode_fixup, so
> > it's better to refine this patch after Jose's work is done. And I would
> > now remove this patch from my branch.
> 
> Btw if you have a revised version of your patch on top of Jose's series, a
> tested-by on that would be awesome. The more people find it useful, the
> faster it will land.
> -Daniel

Hi, Daniel:

I understand.

Hi Bibby:

If you have time, please help to test Jose's patches with the problem
you have met. Otherwise, it would be a long process.

Regards,
CK