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Date:   Wed, 1 Jul 2020 18:42:15 +0200
From:   =?utf-8?Q?Ond=C5=99ej?= Jirman <megous@megous.com>
To:     Guido =?utf-8?Q?G=C3=BCnther?= <guido.gunther@puri.sm>
Cc:     linux-sunxi@googlegroups.com,
        Thierry Reding <thierry.reding@gmail.com>,
        Sam Ravnborg <sam@ravnborg.org>,
        David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>,
        Purism Kernel Team <kernel@puri.sm>,
        Rob Herring <robh+dt@kernel.org>,
        Maxime Ripard <mripard@kernel.org>,
        Chen-Yu Tsai <wens@csie.org>,
        Linus Walleij <linus.walleij@linaro.org>,
        Icenowy Zheng <icenowy@aosc.io>,
        dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        Samuel Holland <samuel@sholland.org>,
        Martijn Braam <martijn@brixit.nl>, Luca Weiss <luca@z3ntu.xyz>,
        Bhushan Shah <bshah@kde.org>
Subject: Re: [PATCH v6 00/13] Add support for PinePhone LCD panel
Message-ID: <20200701164215.warjiiduzschibkt@core.my.home>
Mail-Followup-To: =?utf-8?Q?Ond=C5=99ej?= Jirman <megous@megous.com>,
        Guido =?utf-8?Q?G=C3=BCnther?= <guido.gunther@puri.sm>,
        linux-sunxi@googlegroups.com,
        Thierry Reding <thierry.reding@gmail.com>,
        Sam Ravnborg <sam@ravnborg.org>, David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>,
        Purism Kernel Team <kernel@puri.sm>,
        Rob Herring <robh+dt@kernel.org>,
        Maxime Ripard <mripard@kernel.org>, Chen-Yu Tsai <wens@csie.org>,
        Linus Walleij <linus.walleij@linaro.org>,
        Icenowy Zheng <icenowy@aosc.io>, dri-devel@lists.freedesktop.org,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        Samuel Holland <samuel@sholland.org>,
        Martijn Braam <martijn@brixit.nl>, Luca Weiss <luca@z3ntu.xyz>,
        Bhushan Shah <bshah@kde.org>
References: <20200701103126.1512615-1-megous@megous.com>
 <20200701155405.GA174356@bogon.m.sigxcpu.org>
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Hello,

On Wed, Jul 01, 2020 at 05:54:05PM +0200, Guido G?nther wrote:
> Hi,
> On Wed, Jul 01, 2020 at 12:31:13PM +0200, Ondrej Jirman wrote:
> > This patchset adds support for the LCD panel of PinePhone.
> 
> I gave this a quick spin on the Librem5 devkit so
> 
> Tested-by: Guido G?nther <agx@sigxcpu.org>
> 
> but please also adjust MAINTAINERS so we stay in the loop on driver
> changes.

Ah, right. I'll send a quick followup patch[1] after this gets merged,
or add it to v8 if there will be a need for v8. Thanks for noticing.

[1] https://megous.com/dl/tmp/0001-MAINTAINERS-Update-entry-for-st7703-driver-after-the.patch

And thanks for testing, too. :)

regards,
	o.

> Cheers,
>  -- Guido
> 
> > 
> > I've tested this on PinePhone 1.0 and 1.2.
> > 
> > Please take a look.
> > 
> > thank you and regards,
> >   Ondrej Jirman
> > 
> > Changes in v6:
> > - Fixed spacing in yaml
> > - Fixed wrong vccio->iovcc supply name in the bindings doc
> > - I noticed that the original driver uses a delay of 20ms in the init
> >   function to achieve a combined total of 120ms required from post-reset
> >   to display_on. I've added a similar delay to xbd599_init, so that
> >   xbd599 panel also has the right timing. (patch 9)
> > - v5->v6 diff: https://megous.com/dl/tmp/v5-v6.patch
> > - Added review/ack tags
> > - Learned to run dt_binding_check by myself ;)
> > 
> > Changes in v5:
> > - rewritten on top of rocktech-jh057n00900 driver
> > - rocktech-jh057n00900 renamed to st7703 (controller name)
> > - converted rocktech-jh057n00900 bindings to yaml and extended for xbd599
> > 
> > Changes in v4:
> > - use ->type from the mode instead of hardcoding (Samuel)
> > - move init_sequence to ->prepare (Samuel)
> > - move anti-flicker delay to ->enable, explain it (Samuel)
> > - add enter_sleep after display_off (Samuel)
> > - drop ->disable (move code to ->unprepare)
> > - add ID bytes dumping (Linus)
> >   (I can't test it since allwinner DSI driver has a broken
> >    dcs_read function, and I didn't manage to fix it.)
> > - document magic bytes (Linus)
> > - assert reset during powerup
> > - cleanup powerup timings according to the datasheet
> > 
> > Changes in v3:
> > - Panel driver renamed to the name of the LCD controller
> > - Re-organize the driver slightly to more easily support more panels
> >   based on the same controller.
> > - Add patch to enable the touchscreen to complete the LCD support
> >   on PinePhone.
> > - Dropped the "DSI fix" patch (the driver seems to work for me without it)
> > - Improved brightness levels handling:
> >   - PinePhone 1.0 uses default levels generated by the driver
> >   - On PinePhone 1.1 duty cycles < 20% lead to black screen, so
> >     default levels can't be used. Martijn Braam came up with a
> >     list of duty cycle values that lead to perception of linear
> >     brigtness level <-> light intensity on PinePhone 1.1
> > - There was some feedback on v2 about this being similar to st7701.
> >   It's only similar in name. Most of the "user commands" are different,
> >   so I opted to keep this in a new driver instead of creating st770x.
> >   
> >   Anyone who likes to check the differences, here are datasheets:
> > 
> >   - https://megous.com/dl/tmp/ST7703_DS_v01_20160128.pdf
> >   - https://megous.com/dl/tmp/ST7701.pdf
> > 
> > Changes in v2:
> > - DT Example fix.
> > - DT Format fix.
> > - Raised copyright info to 2020.
> > - Sort panel operation functions.
> > - Sort inclusion.
> > 
> > 
> > -- For phone owners: --
> > 
> > There's an open question on how to set the backlight brightness values
> > on post 1.0 revision phone, since lower duty cycles (< 10-20%) lead
> > to backlight being black. It would be nice if more people can test
> > the various backlight levels on 1.1 and 1.2 revision with this change
> > in dts:
> > 
> >        brightness-levels = <0 1000>;
> >        num-interpolated-steps = <1000>;
> > 
> > and report at what brightness level the backlight turns on. So far it
> > seems this has a wide range. Lowest useable duty cycle for me is ~7%
> > on 1.2 and for Martijn ~20% on 1.1.
> > 
> > Icenowy Zheng (2):
> >   dt-bindings: vendor-prefixes: Add Xingbangda
> >   arm64: dts: sun50i-a64-pinephone: Enable LCD support on PinePhone
> > 
> > Ondrej Jirman (11):
> >   dt-bindings: panel: Convert rocktech,jh057n00900 to yaml
> >   dt-bindings: panel: Add compatible for Xingbangda XBD599 panel
> >   drm/panel: rocktech-jh057n00900: Rename the driver to st7703
> >   drm/panel: st7703: Rename functions from jh057n prefix to st7703
> >   drm/panel: st7703: Prepare for supporting multiple panels
> >   drm/panel: st7703: Move code specific to jh057n closer together
> >   drm/panel: st7703: Move generic part of init sequence to enable
> >     callback
> >   drm/panel: st7703: Add support for Xingbangda XBD599
> >   drm/panel: st7703: Enter sleep after display off
> >   drm/panel: st7703: Assert reset prior to powering down the regulators
> >   arm64: dts: sun50i-a64-pinephone: Add touchscreen support
> > 
> >  .../display/panel/rocktech,jh057n00900.txt    |  23 -
> >  .../display/panel/rocktech,jh057n00900.yaml   |  70 ++
> >  .../devicetree/bindings/vendor-prefixes.yaml  |   2 +
> >  .../allwinner/sun50i-a64-pinephone-1.1.dts    |  19 +
> >  .../dts/allwinner/sun50i-a64-pinephone.dtsi   |  54 ++
> >  drivers/gpu/drm/panel/Kconfig                 |  26 +-
> >  drivers/gpu/drm/panel/Makefile                |   2 +-
> >  .../drm/panel/panel-rocktech-jh057n00900.c    | 424 -----------
> >  drivers/gpu/drm/panel/panel-sitronix-st7703.c | 656 ++++++++++++++++++
> >  9 files changed, 815 insertions(+), 461 deletions(-)
> >  delete mode 100644 Documentation/devicetree/bindings/display/panel/rocktech,jh057n00900.txt
> >  create mode 100644 Documentation/devicetree/bindings/display/panel/rocktech,jh057n00900.yaml
> >  delete mode 100644 drivers/gpu/drm/panel/panel-rocktech-jh057n00900.c
> >  create mode 100644 drivers/gpu/drm/panel/panel-sitronix-st7703.c
> > 
> > -- 
> > 2.27.0
> >