linux-kernel - Re: [PATCH v1 2/4] drm/panel: boe-tv101wum-nl6: Support for BOE nv110wum-l60 MIPI-DSI panel

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Date: Fri, 19 Apr 2024 08:48:42 +0800
From: cong yang <yangcong5@...qin.corp-partner.google.com>
To: Linus Walleij <linus.walleij@...aro.org>
Cc: Doug Anderson <dianders@...omium.org>, sam@...nborg.org, neil.armstrong@...aro.org, 
	daniel@...ll.ch, airlied@...il.com, robh+dt@...nel.org, 
	krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org, 
	dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/4] drm/panel: boe-tv101wum-nl6: Support for BOE
 nv110wum-l60 MIPI-DSI panel

Hi,

Linus Walleij <linus.walleij@...aro.org> 于2024年4月18日周四 22:00写道：
>
> On Thu, Apr 18, 2024 at 2:42 PM cong yang
> <yangcong5@...qin.corp-partner.google.com> wrote:
>
> > I learned from himax that even if the same controller is used with
> > different glasses, the corresponding parameters are not fixed.
> >
> > For example: _INIT_DCS_CMD(0xB9, 0x83, 0x10, 0x21, 0x55, 0x00),
> >
> > even in the group initial code, the same register will be loaded with
> > parameters twice.
> (...)
> > So assuming that the registers of the two screens is the same now,
> > it cannot be set as a common parameter.
> > Otherwise, it may be a bit troublesome for the maintainers.
> >
> > If necessary, I can break out starry_himax83102_j02, boe_nv110wum and
> > ivo_t109nw41
> > as separate driver. Then add some define to these registers.
>
> Why would you do a separate driver per panel despite they have
> the same display controller? I don't get it.
>
> Use one driver, use different compatible strings for the different
> panels and use the corresponding sequence for each panel
> selected by compatible string.

I mean add starry_himax83102_j02, boe_nv110wum and ivo_t109nw41
together to make a separate driver and break out boe-tv101wum-nl6 ,
because they belong to the same controller.

As Doug said ：
“I'm just guessing, but if those are the same controller as
the two new ones you're adding in this series, maybe all
3 of them should be in their own driver? Maybe we can do something to
make more sense of some of these commands too? ”


Thanks.
>
> For example, see drivers/gpu/drm/panel/panel-novatek-nt35510.c:
>
> static const struct of_device_id nt35510_of_match[] = {
>         {
>                 .compatible = "frida,frd400b25025",
>                 .data = &nt35510_frida_frd400b25025,
>         },
>         {
>                 .compatible = "hydis,hva40wv1",
>                 .data = &nt35510_hydis_hva40wv1,
>         },
>         { }
> };
>
>
> Take some inspiration from this driver and how we parameterize
> the different data depending on compatible string.
>
> Yours,
> Linus Walleij