Hi Marek, Thank you for the patch. On Sun, Feb 13, 2022 at 03:26:48AM +0100, Marek Vasut 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. Do you know what this is caused by ? It's a bit annoying to add a 10+ms delay at start time just to be notified of rare cases. > Signed-off-by: Marek Vasut <marex@xxxxxxx> > Cc: Jagan Teki <jagan@xxxxxxxxxxxxxxxxxxxx> > Cc: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> > Cc: Linus Walleij <linus.walleij@xxxxxxxxxx> > Cc: Robert Foss <robert.foss@xxxxxxxxxx> > Cc: Sam Ravnborg <sam@xxxxxxxxxxxx> > Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx > --- > 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, -- Regards, Laurent Pinchart
