From: Sam Ravnborg <sam@ravnborg.org>
To: Doug Anderson <dianders@chromium.org>
Cc: "Thierry Reding" <thierry.reding@gmail.com>,
"Heiko Stuebner" <heiko@sntech.de>,
"Sean Paul" <seanpaul@chromium.org>,
devicetree@vger.kernel.org, "Rob Herring" <robh+dt@kernel.org>,
"David Airlie" <airlied@linux.ie>,
"Jeffy Chen" <jeffy.chen@rock-chips.com>,
dri-devel <dri-devel@lists.freedesktop.org>,
LKML <linux-kernel@vger.kernel.org>,
"open list:ARM/Rockchip SoC..."
<linux-rockchip@lists.infradead.org>,
"Boris Brezillon" <boris.brezillon@collabora.com>,
"Laurent Pinchart" <laurent.pinchart@ideasonboard.com>,
"Enric Balletbò" <enric.balletbo@collabora.com>,
"Stéphane Marchesin" <marcheu@chromium.org>,
"Ezequiel Garcia" <ezequiel@collabora.com>,
"Matthias Kaehlcke" <mka@chromium.org>
Subject: Re: [PATCH v5 2/7] drm/panel: simple: Add ability to override typical timing
Date: Mon, 8 Jul 2019 19:50:08 +0200 [thread overview]
Message-ID: <20190708175007.GA3511@ravnborg.org> (raw)
In-Reply-To: <CAD=FV=V_wTD1xpkXRe-z2HsZ8QXKq7jmq8CsfhMnFxi-5XDJjw@mail.gmail.com>
Hi Dough.
On Mon, Jul 01, 2019 at 09:39:24AM -0700, Doug Anderson wrote:
> Hi,
>
> On Sun, Jun 30, 2019 at 1:22 PM Sam Ravnborg <sam@ravnborg.org> wrote:
> >
> > > @@ -91,6 +92,8 @@ struct panel_simple {
> > > struct i2c_adapter *ddc;
> > >
> > > struct gpio_desc *enable_gpio;
> > > +
> > > + struct drm_display_mode override_mode;
> > I fail to see where this poiter is assigned.
>
> In panel_simple_parse_override_mode(). Specifically:
>
> drm_display_mode_from_videomode(&vm, &panel->override_mode);
The above code-snippet is only called in the panel has specified display
timings using display_timings - it is not called when display_mode is
used.
So override_mode is only assigned in some cases and not all cases.
This needs to be fixed so we do not reference override_mode unless
it is set.
>
>
> > @@ -152,6 +162,44 @@ static int panel_simple_get_fixed_modes(struct panel_simple *panel)
> > > num++;
> > > }
> > >
> > > + return num;
> > > +}
> > > +
> > > +static int panel_simple_get_non_edid_modes(struct panel_simple *panel)
> > > +{
> > > + struct drm_connector *connector = panel->base.connector;
> > > + struct drm_device *drm = panel->base.drm;
> > > + struct drm_display_mode *mode;
> > > + bool has_override = panel->override_mode.type;
> > This looks suspicious.
> > panel->override_mode.type is an unsigned int that may have a number of
> > bits set.
> > So the above code implicitly convert a .type != 0 to a true.
> > This can be expressed in a much more reader friendly way.
>
> You would suggest that I add a boolean field to a structure to
> indicate whether an override mode is present?
A simple bool has_override = panel->override_mode.type != 0;
would do the trick here.
Then there is no hidden conversion from int to a bool.
But as override_mode can be NULL something more needs to be done.
Sam
next prev parent reply other threads:[~2019-07-08 17:50 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-01 17:17 [PATCH v5 0/7] drm/panel: simple: Add mode support to devicetree Douglas Anderson
2019-04-01 17:17 ` [PATCH v5 1/7] dt-bindings: Add panel-timing subnode to simple-panel Douglas Anderson
2019-04-06 6:06 ` Rob Herring
2019-04-08 9:10 ` Boris Brezillon
2019-04-08 10:32 ` Thierry Reding
2019-04-08 14:39 ` Doug Anderson
2019-05-20 18:35 ` Doug Anderson
2019-06-28 23:47 ` Thierry Reding
2019-06-30 20:02 ` Sam Ravnborg
2019-07-01 16:59 ` Doug Anderson
2019-04-01 17:17 ` [PATCH v5 2/7] drm/panel: simple: Add ability to override typical timing Douglas Anderson
2019-04-08 9:10 ` Boris Brezillon
2019-06-28 23:49 ` Thierry Reding
2019-06-30 20:22 ` Sam Ravnborg
2019-06-30 20:55 ` Sam Ravnborg
2019-07-01 16:39 ` Doug Anderson
2019-07-08 17:56 ` Sam Ravnborg
2019-07-10 22:56 ` Doug Anderson
2019-07-11 19:16 ` Sean Paul
2019-07-01 16:39 ` Doug Anderson
2019-07-08 17:50 ` Sam Ravnborg [this message]
2019-07-10 22:39 ` Doug Anderson
2019-07-11 19:38 ` Sam Ravnborg
2019-04-01 17:17 ` [PATCH v5 3/7] arm64: dts: rockchip: Specify override mode for kevin panel Douglas Anderson
2019-07-11 21:30 ` Heiko Stübner
2019-04-01 17:17 ` [PATCH v5 4/7] drm/panel: simple: Use display_timing for Innolux n116bge Douglas Anderson
2019-06-28 23:50 ` Thierry Reding
2019-04-01 17:17 ` [PATCH v5 5/7] drm/panel: simple: Use display_timing for AUO b101ean01 Douglas Anderson
2019-06-28 23:50 ` Thierry Reding
2019-04-01 17:17 ` [PATCH v5 6/7] ARM: dts: rockchip: Specify rk3288-veyron-chromebook's display timings Douglas Anderson
2019-04-07 1:15 ` Urja Rannikko
2019-04-08 15:21 ` Doug Anderson
2019-04-08 16:26 ` Urja Rannikko
2019-04-13 0:07 ` Doug Anderson
2019-07-11 21:27 ` Heiko Stübner
2019-07-11 21:52 ` Heiko Stübner
2019-04-01 17:17 ` [PATCH v5 7/7] ARM: dts: rockchip: Specify rk3288-veyron-minnie's " Douglas Anderson
2019-07-11 21:28 ` Heiko Stübner
2019-06-14 10:39 ` [PATCH v5 0/7] drm/panel: simple: Add mode support to devicetree Heiko Stuebner
2019-06-26 13:00 ` Sam Ravnborg
2019-06-26 14:41 ` Doug Anderson
2019-06-28 15:55 ` Doug Anderson
2019-06-28 16:10 ` Rob Herring
2019-06-28 17:13 ` Sam Ravnborg
2019-06-29 14:09 ` Heiko Stübner
2019-07-08 15:58 ` Doug Anderson
2019-07-11 19:35 ` Sam Ravnborg
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