linux-kernel - Re: [PATCH] drm/panel: himax-hx83112a: transition to mipi

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAD=FV=WW4TCKY6-XGnGbf+x4T39OBAcUtaRo_WVzd=HTJpCkxg@mail.gmail.com>
Date: Wed, 11 Sep 2024 13:07:00 -0700
From: Doug Anderson <dianders@...omium.org>
To: neil.armstrong@...aro.org
Cc: Tejas Vipin <tejasvipin76@...il.com>, Abhishek Tamboli <abhishektamboli9@...il.com>, 
	Jessica Zhang <quic_jesszhan@...cinc.com>, maarten.lankhorst@...ux.intel.com, 
	mripard@...nel.org, tzimmermann@...e.de, airlied@...il.com, daniel@...ll.ch, 
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
	Javier Martinez Canillas <javierm@...hat.com>
Subject: Re: [PATCH] drm/panel: himax-hx83112a: transition to mipi_dsi wrapped functions

Hi,

On Wed, Sep 11, 2024 at 12:41 AM <neil.armstrong@...aro.org> wrote:
>
> On 10/09/2024 23:19, Doug Anderson wrote:
> > Hi,
> >
> > On Sat, Sep 7, 2024 at 1:32 AM Tejas Vipin <tejasvipin76@...il.com> wrote:
> >>
> >> On 9/7/24 3:53 AM, Jessica Zhang wrote:
> >>>
> >>>
> >>> On 9/6/2024 3:14 PM, Jessica Zhang wrote:
> >>>>
> >>>>
> >>>> On 9/4/2024 7:15 AM, Tejas Vipin wrote:
> >>>>> Changes the himax-hx83112a panel to use multi style functions for
> >>>>> improved error handling.
> >>>>>
> >>>>> Signed-off-by: Tejas Vipin <tejasvipin76@...il.com>
> >>>>
> >>>> Reviewed-by: Jessica Zhang <quic_jesszhan@...cinc.com>
> >>>
> >>> Hi Tejas,
> >>>
> >>> Just a heads up, it seems that this might be a duplicate of this change [1]?
> >>>
> >>> Thanks,
> >>>
> >>> Jessica Zhang
> >>>
> >>> [1] https://patchwork.freedesktop.org/patch/612367/?series=138155&rev=1
> >>
> >> Ah, thanks for letting me know. I hadn't realized someone else had
> >> started working on this too.
> >>
> >> However, I would argue that my patch [2] is a better candidate for merging
> >> because of the following reasons:
> >>
> >> 1) Removes unnecessary error printing:
> >> The mipi_dsi_*_multi() functions all have inbuilt error printing which
> >> makes printing errors after hx83112a_on unnecessary as is addressed in
> >> [2] like so:
> >>
> >>> -     ret = hx83112a_on(ctx);
> >>> +     ret = hx83112a_on(ctx->dsi);
> >>>        if (ret < 0) {
> >>> -             dev_err(dev, "Failed to initialize panel: %d\n", ret);
> >>>                gpiod_set_value_cansleep(ctx->reset_gpio, 1);
> >>>                regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
> >>> -             return ret;
> >>>        }
> >>
> >> [2] also removes the unnecessary dev_err after regulator_bulk_enable as was
> >> addressed in [3] like so:
> >>
> >>>        ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
> >>> -     if (ret < 0) {
> >>> -             dev_err(dev, "Failed to enable regulators: %d\n", ret);
> >>> +     if (ret < 0)
> >>>                return ret;
> >>> -     }
> >>
> >> 2) Better formatting
> >>
> >> The mipi_dsi_dcs_write_seq_multi statements in [1] aren't formatted
> >> quite right according to what has been done so far. They are written as
> >> such in [1]:
> >>
> >>> +     mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83112A_SETTP1,
> >>>                               0x02, 0x00, 0xa8, 0x01, 0xa8, 0x0d, 0xa4, 0x0e);
> >>
> >> Where they should be written as such in [2]:
> >>
> >>> +     mipi_dsi_dcs_write_seq_multi(&dsi_ctx, HX83112A_SETTP1,
> >>> +                                  0x02, 0x00, 0xa8, 0x01, 0xa8, 0x0d, 0xa4, 0x0e);
> >>
> >> All in all, the module generated using my patch ends up being a teensy
> >> bit smaller (1% smaller). But if chronology is what is important, then
> >> it would at least be nice to see the above changes as part of Abhishek's
> >> patch too. And I'll be sure to look at the mail in the drm inbox now
> >> onwards :p
> >>
> >> [1] https://patchwork.freedesktop.org/patch/612367/?series=138155&rev=1
> >> [2] https://lore.kernel.org/all/20240904141521.554451-1-tejasvipin76@gmail.com/
> >> [3] https://lore.kernel.org/all/CAD=FV=XRZKL_ppjUKDK61fQkWhHiQCJLfmVBS7wSo4sUux2g8Q@mail.gmail.com/
> >
> > I would tend to agree that Tejas's patch looks slightly better, but
> > Abhishek's patch appears to have been posted first.
> >
> > Neil: any idea what to do here? Maybe a Co-Developed-by or something?
> > ...or we could land Abhishek and Tejas could post a followup for the
> > extra cleanup?
>
> Yeah usually I take the first one when they are equal, but indeed Tejas
> cleanup up a little further and better aligned the parameters so I think
> Tejas's one is a better looking version.
>
> In this case we should apply Teja's one, nothing personal Abhishek!

Pushed to drm-misc-next:

[1/1] drm/panel: himax-hx83112a: transition to mipi_dsi wrapped functions
      commit: 32e5666b8a4d0f2aee39a0b2f8386cf9f86a8225