linux-kernel - Re: [PATCH 0/4] video: of: display_timing: Adjust err printing of of_get_display

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Message-ID: <20190723083847.GA32268@ravnborg.org>
Date:   Tue, 23 Jul 2019 10:38:47 +0200
From:   Sam Ravnborg <sam@...nborg.org>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Thierry Reding <thierry.reding@...il.com>,
        David Airlie <airlied@...ux.ie>, linux-fbdev@...r.kernel.org,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        dri-devel@...ts.freedesktop.org,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Russell King <linux@...linux.org.uk>,
        Daniel Vetter <daniel@...ll.ch>, linux-kernel@...r.kernel.org,
        Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH 0/4] video: of: display_timing: Adjust err printing of
 of_get_display_timing()

Hi Dough.

On Mon, Jul 22, 2019 at 11:24:35AM -0700, Douglas Anderson wrote:
> As reported by Sam Ravnborg [1], after commit b8a2948fa2b3
> ("drm/panel: simple: Add ability to override typical timing") we now
> see a pointless error message printed on every boot for many systems.
> Let's fix that by adjusting who is responsible for printing error
> messages when of_get_display_timing() is used.
> 
> Most certainly we can bikeshed the topic about whether this is the
> right fix or we should instead add logic to panel_simple_probe() to
> avoid calling of_get_display_timing() in the case where there is no
> "panel-timing" sub-node.  If there is consensus that I should move the
> fix to panel_simple_probe() I'm happy to spin this series.  In that
> case we probably should _remove_ the extra prints that were already
> present in the other two callers of of_get_display_timing().
> 
> While at it, fix a missing of_node_put() found by code inspection.
> 
> NOTE: amba-clcd and panel-lvds were only compile-tested.
> 
> [1] https://lkml.kernel.org/r/20190721093815.GA4375@ravnborg.org
> 
> 
> Douglas Anderson (4):
>   video: of: display_timing: Add of_node_put() in
>     of_get_display_timing()
>   video: of: display_timing: Don't yell if no timing node is present
>   drm: panel-lvds: Spout an error if of_get_display_timing() gives an
>     error
>   video: amba-clcd: Spout an error if of_get_display_timing() gives an
>     error

Series looks good - thanks.
Reviewed-by: Sam Ravnborg <sam@...nborg.org>

You could consider silencing display_timing as the last patch, but thats
a very small detail.

How do we apply these fixes - to drm-misc-next? Bartlomiej?

No need to go in via drm-misc-fixes as the offending commit is only in
drm-misc-next.

	Sam