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SubjectRe: [PATCH v2 06/12] drm/sun4i: sun6i_mipi_dsi: Probe tcon0 during dsi_bind
On Mon, Nov 19, 2018 at 2:08 PM Maxime Ripard <maxime.ripard@bootlin.com> wrote:
>
> On Fri, Nov 16, 2018 at 10:09:10PM +0530, Jagan Teki wrote:
> > Probe tcon0 during dsi_bind, so-that the tcon attributes like
> > divider value, clock rate can get whenever it need.
> >
> > Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
> > ---
> > drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 7 +++++++
> > drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h | 1 +
> > 2 files changed, 8 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > index d60955880c43..66a01061e51d 100644
> > --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > @@ -25,6 +25,7 @@
> > #include <drm/drm_panel.h>
> >
> > #include "sun4i_drv.h"
> > +#include "sun4i_tcon.h"
> > #include "sun6i_mipi_dsi.h"
> >
> > #include <video/mipi_display.h>
> > @@ -1007,6 +1008,7 @@ static int sun6i_dsi_bind(struct device *dev, struct device *master,
> > struct drm_device *drm = data;
> > struct sun4i_drv *drv = drm->dev_private;
> > struct sun6i_dsi *dsi = dev_get_drvdata(dev);
> > + struct sun4i_tcon *tcon0 = sun4i_get_tcon0(drm);
> > int ret;
> >
> > if (!dsi->panel)
> > @@ -1014,6 +1016,11 @@ static int sun6i_dsi_bind(struct device *dev, struct device *master,
> >
> > dsi->drv = drv;
> >
> > + if (!tcon0)
> > + return -EPROBE_DEFER;
>
> You can't fall in that condition. The component framework won't call
> bind unless every components have been probed.

Since tcon0 is already probed is it? if so I can return -EINVAL is it ok?

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