[PATCH v3 4/7] drm: exynos: dsi: Separate pre_enable, post_disable code

[Jagan Teki]

On Mon, Dec 13, 2021 at 3:27 PM Andrzej Hajda <andrzej.hajda at intel.com> wrote:
>
>
> On 12.12.2021 19:14, Jagan Teki wrote:
> > Existing driver is calling manual bridge pre_enable, enable,
> > disable and post_disable helpers with their enable and
> > disable functions.
> >
> > Separate the enable code with pre_enable and enable helpers
> > like enable the DSI in pre_enable and set the display in enable.
> >
> > Separate the disable code with disable and post_disable helpers
> > like disable the DSI in disable and reset the display in
> > post_disable.
> >
> > This way the bridge functions are compatible with respective
> > downstream bridge and panel_bridge drivers.
> >
> > Example of enable bridge function calls with panel_bridge is,
> >
> > [ 2.079030] panel_bridge_pre_enable: start
> > [ 2.079043] panel_bridge_pre_enable: end!
> > [ 2.079045] exynos_dsi_atomic_pre_enable: start
> > [ 2.079723] exynos_dsi_atomic_pre_enable: end!
> > [ 2.079728] exynos_dsi_atomic_enable: start
> > [ 2.102500] exynos_dsi_atomic_enable: end
> > [ 2.146505] panel_bridge_enable: start
> > [ 2.148547] panel_bridge_enable: enable
> > Signed-off-by: Jagan Teki <jagan at amarulasolutions.com>
> > ---
> > Changes for v3:
> > - new patch
> >
> >   drivers/gpu/drm/exynos/exynos_drm_dsi.c | 25 ++++++++++++-------------
> >   1 file changed, 12 insertions(+), 13 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> > index 1450187c1edc..07083a545948 100644
> > --- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> > +++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> > @@ -1377,10 +1377,9 @@ static void exynos_dsi_unregister_te_irq(struct exynos_dsi *dsi)
> >       }
> >   }
> >
> > -static void exynos_dsi_enable(struct drm_bridge *bridge)
> > +static void exynos_dsi_pre_enable(struct drm_bridge *bridge)
> >   {
> >       struct exynos_dsi *dsi = bridge_to_dsi(bridge);
> > -     const struct drm_bridge_funcs *funcs = dsi->out_bridge->funcs;
> >       int ret;
> >
> >       if (dsi->state & DSIM_STATE_ENABLED)
> > @@ -1393,38 +1392,36 @@ static void exynos_dsi_enable(struct drm_bridge *bridge)
> >       }
> >
> >       dsi->state |= DSIM_STATE_ENABLED;
> > +}
> >
> > -     if (dsi->out_bridge)
> > -             funcs->pre_enable(dsi->out_bridge);
> > +static void exynos_dsi_enable(struct drm_bridge *bridge)
> > +{
> > +     struct exynos_dsi *dsi = bridge_to_dsi(bridge);
> >
> >       exynos_dsi_set_display_mode(bridge);
> >       exynos_dsi_set_display_enable(dsi, true);
> >
> > -     if (dsi->out_bridge)
> > -             funcs->enable(dsi->out_bridge);
> > -
>
>
> Ok, apparently I haven't catch that in previous patch you have left out
> bridge attached to encoder->bridge_chain, before the previous patch out
> bridge was detached from bridge_chain, which assured exynos_dsi has full
> control about callbacks.
>
> Does it mean that after prev patch all bridge calls were called twice, I
> think it is incorrect.

I think squash this to previous patch make sense. let me know if you
are fine with it?

Thanks,
Jagan.