[PATCH][RESEND] drm/bridge: ti-sn65dsi83: Check link status register after enabling the bridge

[Robert Foss]

On Thu, 31 Mar 2022 at 17:32, Robert Foss <robert.foss at linaro.org> wrote:
>
> On Sun, 13 Feb 2022 at 03:27, Marek Vasut <marex at denx.de> wrote:
> >
> > In rare cases, the bridge may not start up correctly, which usually
> > leads to no display output. In case this happens, warn about it in
> > the kernel log.
> >
> > Signed-off-by: Marek Vasut <marex at denx.de>
> > Cc: Jagan Teki <jagan at amarulasolutions.com>
> > Cc: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
> > Cc: Linus Walleij <linus.walleij at linaro.org>
> > Cc: Robert Foss <robert.foss at linaro.org>
> > Cc: Sam Ravnborg <sam at ravnborg.org>
> > Cc: dri-devel at lists.freedesktop.org
> > ---
> >  drivers/gpu/drm/bridge/ti-sn65dsi83.c | 5 +++++
> >  1 file changed, 5 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi83.c b/drivers/gpu/drm/bridge/ti-sn65dsi83.c
> > index 19daaddd29a41..1d7c154ea1d79 100644
> > --- a/drivers/gpu/drm/bridge/ti-sn65dsi83.c
> > +++ b/drivers/gpu/drm/bridge/ti-sn65dsi83.c
> > @@ -488,6 +488,11 @@ static void sn65dsi83_atomic_enable(struct drm_bridge *bridge,
> >         /* Clear all errors that got asserted during initialization. */
> >         regmap_read(ctx->regmap, REG_IRQ_STAT, &pval);
> >         regmap_write(ctx->regmap, REG_IRQ_STAT, pval);
> > +
> > +       usleep_range(10000, 12000);
> > +       regmap_read(ctx->regmap, REG_IRQ_STAT, &pval);
> > +       if (pval)
> > +               dev_err(ctx->dev, "Unexpected link status 0x%02x\n", pval);
> >  }
> >
> >  static void sn65dsi83_atomic_disable(struct drm_bridge *bridge,
> > --
> > 2.34.1
> >
>
> Reviewed-by: Robert Foss <robert.foss at linaro.org>

Applied to drm-misc-next.