On Sat, Sep 28, 2019 at 10:23 PM james qian wang (Arm Technology
China) <james.qian.wang@xxxxxxx> wrote:
>
> On Wed, Sep 25, 2019 at 03:58:31PM -0700, Derek Basehore wrote:
> > Devicetree systems can set panel orientation via a panel binding, but
> > there's no way, as is, to propagate this setting to the connector,
> > where the property need to be added.
> > To address this, this patch sets orientation, as well as other fixed
> > values for the panel, in the drm_panel_attach function. These values
> > are stored from probe in the drm_panel struct.
> >
> > Signed-off-by: Derek Basehore <dbasehore@xxxxxxxxxxxx>
> > Reviewed-by: Sam Ravnborg <sam@xxxxxxxxxxxx>
> > ---
> > drivers/gpu/drm/drm_panel.c | 28 +++++++++++++++++++++
> > include/drm/drm_panel.h | 50 +++++++++++++++++++++++++++++++++++++
> > 2 files changed, 78 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c
> > index 0909b53b74e6..1cd2b56c9fe6 100644
> > --- a/drivers/gpu/drm/drm_panel.c
> > +++ b/drivers/gpu/drm/drm_panel.c
> > @@ -104,11 +104,23 @@ EXPORT_SYMBOL(drm_panel_remove);
> > */
> > int drm_panel_attach(struct drm_panel *panel, struct drm_connector *connector)
> > {
> > + struct drm_display_info *info;
> > +
> > if (panel->connector)
> > return -EBUSY;
> >
> > panel->connector = connector;
> > panel->drm = connector->dev;
> > + info = &connector->display_info;
> > + info->width_mm = panel->width_mm;
> > + info->height_mm = panel->height_mm;
> > + info->bpc = panel->bpc;
> > + info->panel_orientation = panel->orientation;
> > + info->bus_flags = panel->bus_flags;
> > + if (panel->bus_formats)
> > + drm_display_info_set_bus_formats(&connector->display_info,
> > + panel->bus_formats,
> > + panel->num_bus_formats);
> >
> > return 0;
> > }
> > @@ -126,6 +138,22 @@ EXPORT_SYMBOL(drm_panel_attach);
> > */
> > void drm_panel_detach(struct drm_panel *panel)
> > {
> > + struct drm_display_info *info;
> > +
> > + if (!panel->connector)
> > + goto out;
> > +
> > + info = &panel->connector->display_info;
> > + info->width_mm = 0;
> > + info->height_mm = 0;
> > + info->bpc = 0;
> > + info->panel_orientation = DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
> > + info->bus_flags = 0;
> > + kfree(info->bus_formats);
> > + info->bus_formats = NULL;
> > + info->num_bus_formats = 0;
> > +
> > +out:
> > panel->connector = NULL;
> > panel->drm = NULL;
> > }
> > diff --git a/include/drm/drm_panel.h b/include/drm/drm_panel.h
> > index d16158deacdc..f3587a54b8ac 100644
> > --- a/include/drm/drm_panel.h
> > +++ b/include/drm/drm_panel.h
> > @@ -141,6 +141,56 @@ struct drm_panel {
> > */
> > const struct drm_panel_funcs *funcs;
> >
>
> All these new added members seems dupliated with drm_display_info,
> So I think, can we add a new drm_plane_funcs func:
>
> int (*set_display_info)(struct drm_panel *panel,
> struct drm_display_info *info);
I don't disagree personally, since I originally wrote it this way, but
2 maintainers, Daniel Vetter and Thierry Reding, requested that it be
changed. Unless that decision is reversed, I won't be changing this.
>
> Then in drm_panel_attach(), via this interface the specific panel
> driver can directly set connector->display_info. like
>
> ...
> if (panel->funcs && panel->funcs->set_display_info)
> panel->funcs->unprepare(panel, connector->display_info);
> ...
>
> Thanks
> James
>
> > + /**
> > + * @width_mm:
> > + *
> > + * Physical width in mm.
> > + */
> > + unsigned int width_mm;
> > +
> > + /**
> > + * @height_mm:
> > + *
> > + * Physical height in mm.
> > + */
> > + unsigned int height_mm;
> > +
> > + /**
> > + * @bpc:
> > + *
> > + * Maximum bits per color channel. Used by HDMI and DP outputs.
> > + */
> > + unsigned int bpc;
> > +
> > + /**
> > + * @orientation
> > + *
> > + * Installation orientation of the panel with respect to the chassis.
> > + */
> > + int orientation;
> > +
> > + /**
> > + * @bus_formats
> > + *
> > + * Pixel data format on the wire.
> > + */
> > + const u32 *bus_formats;
> > +
> > + /**
> > + * @num_bus_formats:
> > + *
> > + * Number of elements pointed to by @bus_formats
> > + */
> > + unsigned int num_bus_formats;
> > +
> > + /**
> > + * @bus_flags:
> > + *
> > + * Additional information (like pixel signal polarity) for the pixel
> > + * data on the bus.
> > + */
> > + u32 bus_flags;
> > +
> > /**
> > * @list:
> > *
Thanks for the review
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