linux-kernel - Re: [PATCH v1] drm/panel: simple: add SGD GKTW70SDAD1SD

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Date:   Sun, 10 Jan 2021 20:50:54 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Oliver Graute <oliver.graute@...il.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Marco Felsch <m.felsch@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        DRI mailing list <dri-devel@...ts.freedesktop.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1] drm/panel: simple: add SGD GKTW70SDAD1SD

On Sun, Jan 10, 2021 at 5:09 PM Oliver Graute <oliver.graute@...il.com> wrote:

> here the schematics and my dts. The board is using a LVDS connector for
> the display.

The schematics shows the GKTW70SDAD1SD panel in the J4 connector, not
the LVDS J7 connector.

> https://www.variscite.de/wp-content/uploads/2017/12/VAR-6ULCustomboard-Schematics.pdf
> https://lore.kernel.org/linux-arm-kernel/1610144511-19018-3-git-send-email-oliver.graute@gmail.com/

As I mentioned earlier you should remove the display timings from the
dts when using the compatible string for the panel.

power-supply = <&reg_touch_3v3> is not correct, as the reg_touch_3v3
does not power the LCD.

Another hint is to use the PLL5_VIDEO as the clock source for the
lcdif controller as done in the imx6ul evk dtsi.

It would also help if you could share the complete boot log.