linux-kernel - Re: [PATCH v2 1/2] drm: panel: st7701: Add Hardkernel ODROID-GO Ultra panel support

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Date: Thu, 29 Feb 2024 13:30:22 -0800
From: Jessica Zhang <quic_jesszhan@...cinc.com>
To: Adam Green <greena88@...il.com>, Jagan Teki <jagan@...rulasolutions.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Sam Ravnborg <sam@...nborg.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard
	<mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie
	<airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
        Rob Herring
	<robh+dt@...nel.org>,
        Krzysztof Kozlowski
	<krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, <dri-devel@...ts.freedesktop.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] drm: panel: st7701: Add Hardkernel ODROID-GO Ultra
 panel support



On 2/29/2024 9:23 AM, Adam Green wrote:
> On 26/02/2024 21:29, Jessica Zhang wrote:
>  > Got it. Was the shorter sleep time breaking the display and is it
>  > required for the new panel to work?
>  >
>  > Thanks,
>  >
>  > Jessica Zhang
> 
> Hi Jessica,
> 
> I will be submitting a v3 shortly, the change to the sleep time was not 
> necessary for the new panel
> to work.

Hi Adam,

Got it. If the panel isn't affected by the 20ms sleep time, I'd prefer 
to keep it since 100ms is a pretty big increase.

> 
> I have been able to re-use the gip sequence from the kd50t048a panel 
> used in the Hardkernel Odroid
> Go Super as I have been led to believe it is the same elida panel, 
> unfortunately the same modes
> used by that device do not work for the Odroid Go Ultra and so its still 
> necessary to have the
> patchset,
Got it. FWIW, I do see the Odroid Go Ultra being described as having the 
kd50t048a panel [1] [2]. Looking forward to seeing the v3 changes.

Thanks,

Jessica Zhang

[1] https://gitlab.com/amlogic-foss/mainline-linux-issues-tracker/-/issues/7

[2] 441e129cbf81 ("dt-bindings: display: panel: sitronix,st7701: Add 
Elida KD50T048A Panel")

> 
> Best regards,
> 
> Adam