linux-kernel - RE: [PATCH v2 0/2] Add waveshare 7inch touchscreen panel support

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Date: Tue, 16 Jan 2024 09:32:09 +0000
From: Shengyang Chen <shengyang.chen@...rfivetech.com>
To: "neil.armstrong@...aro.org" <neil.armstrong@...aro.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>
CC: "quic_jesszhan@...cinc.com" <quic_jesszhan@...cinc.com>,
	"sam@...nborg.org" <sam@...nborg.org>, "airlied@...il.com"
	<airlied@...il.com>, "daniel@...ll.ch" <daniel@...ll.ch>,
	"maarten.lankhorst@...ux.intel.com" <maarten.lankhorst@...ux.intel.com>,
	"mripard@...nel.org" <mripard@...nel.org>, "tzimmermann@...e.de"
	<tzimmermann@...e.de>, "robh+dt@...nel.org" <robh+dt@...nel.org>,
	"krzysztof.kozlowski+dt@...aro.org" <krzysztof.kozlowski+dt@...aro.org>,
	"conor+dt@...nel.org" <conor+dt@...nel.org>, "wahrenst@....net"
	<wahrenst@....net>, "dave.stevenson@...pberrypi.com"
	<dave.stevenson@...pberrypi.com>, "thierry.reding@...il.com"
	<thierry.reding@...il.com>, Changhuang Liang
	<changhuang.liang@...rfivetech.com>, Keith Zhao
	<keith.zhao@...rfivetech.com>, Jack Zhu <jack.zhu@...rfivetech.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2 0/2] Add waveshare 7inch touchscreen panel support

Hi, Neil

Thanks for your comment.

> -----Original Message-----
> From: neil.armstrong@...aro.org <neil.armstrong@...aro.org>
> Sent: 2024年1月9日 19:19
> To: Shengyang Chen <shengyang.chen@...rfivetech.com>;
> devicetree@...r.kernel.org; dri-devel@...ts.freedesktop.org
> Cc: quic_jesszhan@...cinc.com; sam@...nborg.org; airlied@...il.com;
> daniel@...ll.ch; maarten.lankhorst@...ux.intel.com; mripard@...nel.org;
> tzimmermann@...e.de; robh+dt@...nel.org;
> krzysztof.kozlowski+dt@...aro.org; conor+dt@...nel.org; wahrenst@....net;
> dave.stevenson@...pberrypi.com; thierry.reding@...il.com; Changhuang
> Liang <changhuang.liang@...rfivetech.com>; Keith Zhao
> <keith.zhao@...rfivetech.com>; Jack Zhu <jack.zhu@...rfivetech.com>;
> linux-kernel@...r.kernel.org
> Subject: Re: [PATCH v2 0/2] Add waveshare 7inch touchscreen panel support
> 
> Hi,
> 
> On 09/01/2024 08:09, Shengyang Chen wrote:
> > This patchset adds waveshare 7inch touchscreen panel support for the
> > StarFive JH7110 SoC.
> 
> Could you precise which SKU you're referring to ? is it 19885 =>
> https://www.waveshare.com/7inch-dsi-lcd.htm ?
> 

yes, it is
sorry for confusing you.

> Are you sure it requires different timings from the RPi one ? In the Waveshare
> wiki it explicitly uses the rpi setup (vc4-kms-dsi-7inch) to drive it:
> https://www.waveshare.com/wiki/7inch_DSI_LCD
> 

Referring to Keith's answer
https://lists.freedesktop.org/archives/dri-devel/2023-December/434200.html
the panel timing value is generated to fit phy's bitrate and prevent overflow and underflow.

Referring to the suggestion, we may try other timing from panel-simple to drive the panel.

> Neil
> 
> >
> >
> > changes since v1:
> > - Rebased on tag v6.7.
> >
> > patch 1:
> > - Gave up original changing.
> > - Changed the commit message.
> > - Add compatible in panel-simple.yaml
> >
> > patch 2:
> > - Gave up original changing.
> > - Changed the commit message.
> > - Add new mode for the panel in panel-simple.c
> >
> > v1:
> > https://patchwork.kernel.org/project/dri-devel/cover/20231124104451.44
> > 271-1-shengyang.chen@...rfivetech.com/
> >
> > Shengyang Chen (2):
> >    dt-bindings: display: panel: panel-simple: Add compatible property for
> >      waveshare 7inch touchscreen panel
> >    gpu: drm: panel: panel-simple: add new display mode for waveshare
> >      7inch touchscreen panel
> >
> >   .../bindings/display/panel/panel-simple.yaml  |  2 ++
> >   drivers/gpu/drm/panel/panel-simple.c          | 28
> +++++++++++++++++++
> >   2 files changed, 30 insertions(+)
> >


Best Regards,
Shengyang