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From: Jagan Teki <jagan@amarulasolutions.com>
To: Chen-Yu Tsai <wens@csie.org>
Cc: Andre Przywara <andre.przywara@arm.com>,
	Maxime Ripard <maxime.ripard@bootlin.com>,
	Icenowy Zheng <icenowy@aosc.io>,
	Jernej Skrabec <jernej.skrabec@siol.net>,
	Vasily Khoruzhick <anarsoul@gmail.com>,
	Rob Herring <robh+dt@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will.deacon@arm.com>,
	David Airlie <airlied@linux.ie>,
	dri-devel <dri-devel@lists.freedesktop.org>,
	Michael Turquette <mturquette@baylibre.com>,
	Stephen Boyd <sboyd@kernel.org>,
	linux-clk <linux-clk@vger.kernel.org>,
	Michael Trimarchi <michael@amarulasolutions.com>,
	linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
	devicetree <devicetree@vger.kernel.org>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	linux-sunxi@googlegroups.com, linux-amarula@amarulasolutions.com
Subject: Re: [PATCH v4 25/26] [DO NOT MERGE] arm64: dts: allwinner: bananapi-m64: Bananapi S070WV20-CT16 DSI panel
Date: Wed, 14 Nov 2018 16:48:39 +0530	[thread overview]
Message-ID: <CAMty3ZAa97_zHTyxfbV+8d7fUMaEuvB_Kg-SYLY42kMEoiJLyA@mail.gmail.com> (raw)
In-Reply-To: <CAGb2v64YOV48UwHc8-=jDt2Bp_4mNb3iuyEzj0d+GOQE_oT-Xg@mail.gmail.com>

On Wed, Nov 14, 2018 at 2:52 PM Chen-Yu Tsai <wens@csie.org> wrote:
>
> On Wed, Nov 14, 2018 at 2:58 PM Chen-Yu Tsai <wens@csie.org> wrote:
> >
> > On Wed, Nov 14, 2018 at 2:31 PM Jagan Teki <jagan@amarulasolutions.com> wrote:
> > >
> > > On Tue, Nov 13, 2018 at 5:52 PM Andre Przywara <andre.przywara@arm.com> wrote:
> > > >
> > > > On Tue, 13 Nov 2018 16:46:32 +0530
> > > > Jagan Teki <jagan@amarulasolutions.com> wrote:
> > > >
> > > > Hi,
> > > >
> > > > > This patch add support for Bananapi S070WV20-CT16 DSI panel to
> > > > > BPI-M64 board.
> > > > >
> > > > > DSI panel connected via board DSI port with,
> > > > > - DC1SW as AVDD supply
> > > >
> > > > Are you sure of that? I don't see anything in the schematic to support
> > > > this. The only power lines that go to the DSI connector are DCDC1 and
> > > > PS. DC1SW is only connected to PortD on the SoC and to the Ethernet PHY.
> > > > Is there anything I miss?
> > >
> > > Thanks for the comment, yes dc1sw is connected in ephy. I have reused
> > > dc1, BSP is attached lcd_power1 to axp81x_dc1sw [1]. I just looking
> > > for someone to comment, may be we can skip this regulator attachment.
> >
> > That seems sketchy. The schematics show the connector has feeds from both
> > the unregulated output IPSOUT (PS) and DCDC1. For designs with RGB LCD
> > panels, we only see the PS feed. Since the LCD panel can be used in either
> > RGB or MIPI DSI mode, I highly suspect the DCDC1 supply feeds the bridge
> > IC.
> >
> > As for DC1SW, this is likely referenced because it provides power to the
> > GPIO lines that are used to control the LCD panel. If you don't provide
> > power, you can't pull them up.
> >
> > While many of us dislike FEX and the new FEX-derived device tree, they
> > do provide some information, such as regulator usage. Note that each
> > regulator output has multiple names, which likely denote specific
> > usages.
> >
> > I've asked BPI for schematics on the bridge board. Hopefully we'll
> > have something in more detail. In the meantime, I suggest leaving
> > this panel out of your next submission, and focus on getting the bulk
> > of the dsi driver and dts changes in first.
>
> I got the schematics, but unfortunately I can't share them publicly.
>
> It looks like VCC-MIPI on the connector is not connected to anything.
> All power is provided from IPSOUT, first through a current limiter IC
> turned on and off by LCD_PWR_EN, and then through some voltage regulators
> to provide the voltages for various parts of the panel, including LCD,
> capacitive touch, and the MIPI-DSI bridge. There's even an onboard EEPROM,
> though I'm not sure what that's for.

So there is no concern supply regulators on panel side, only VCC-DSI.

>
> > >
> > > >
> > > > > - DCDC1 as DVDD supply
> > > >
> > > > That seems right, but doesn't match with what you write below.
> > >
> > > Commit need to fix s/DCDC1/DLDO1
> > >
> > > >
> > > > > - PD6 gpio for reset pin
>
> This toggles reset for both the panel itself and for the MIPI-DSI bridge.
>
> > > > > - PD5 gpio for backlight enable pin
>
> This enables the backlight's regulator.
>
> > > > > - PD7 gpio for backlight vdd supply
>
> This enables power to the whole panel module.
>
> Then you also have the two GPIOs for the capacitive touch controller.
> And also the I2C bus for the controller, and the EEPROM.

Thanks, for the details. I have verified w/ vcc-dsi-supply attached to
dldo1 and the panel with reset w/o any supply regulators.

  reply	other threads:[~2018-11-14 11:18 UTC|newest]

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-13 11:16 [PATCH v4 00/26] drm/sun4i: Allwinner A64 MIPI-DSI support Jagan Teki
2018-11-13 11:16 ` [PATCH v4 01/26] clk: sunxi-ng: a64: Fix gate bit of DSI DPHY Jagan Teki
2018-11-13 13:08   ` Maxime Ripard
2018-11-13 11:16 ` [PATCH v4 02/26] clk: sunxi-ng: Add check for minimal rate to NKM PLLs Jagan Teki
2018-11-13 11:16 ` [PATCH v4 03/26] clk: sunxi-ng: Add check for maximum " Jagan Teki
2018-11-13 13:26   ` Maxime Ripard
2018-11-15 15:21     ` Jagan Teki
2018-11-20 10:55       ` Maxime Ripard
2018-11-20 12:07         ` Jagan Teki
2018-11-13 11:16 ` [PATCH v4 04/26] drm/sun4i: sun6i_mipi_dsi: Add has_mod_clk quirk Jagan Teki
2018-11-13 11:16 ` [PATCH v4 05/26] drm/sun4i: sun6i_mipi_dsi: Add Allwinner A64 MIPI DSI support Jagan Teki
2018-11-13 11:16 ` [PATCH v4 06/26] dt-bindings: sun6i-dsi: Add compatible for A64 MIPI DSI Jagan Teki
2018-11-13 11:16 ` [PATCH v4 07/26] drm/sun4i: sun6i_mipi_dsi: Add DSI Generic short write 2 param transfer Jagan Teki
2018-11-13 11:16 ` [PATCH v4 08/26] drm/sun4i: sun6i_mipi_dsi: Fix VBP size calculation Jagan Teki
2018-11-15  9:55   ` Maxime Ripard
2018-11-15 17:49     ` Jagan Teki
2018-11-20 15:57       ` Maxime Ripard
2018-11-20 16:25         ` Jagan Teki
2018-11-26 12:07           ` [linux-sunxi] " Jagan Teki
2018-11-27 10:25             ` Maxime Ripard
2018-11-27 10:24           ` Maxime Ripard
2018-11-27 11:04             ` [linux-sunxi] " Jagan Teki
2018-12-07 13:21               ` Maxime Ripard
2018-12-10 16:07                 ` Jagan Teki
2018-11-13 11:16 ` [PATCH v4 09/26] drm/sun4i: sun6i_mipi_dsi: Fix TCON DRQ set bits Jagan Teki
2018-11-13 11:16 ` [PATCH v4 10/26] drm/sun4i: sun6i_mipi_dsi: Refactor vertical video start delay Jagan Teki
2018-11-13 11:16 ` [PATCH v4 11/26] drm/sun4i: sun6i_mipi_dsi: Fix DSI hbp timing value Jagan Teki
2018-11-13 11:16 ` [PATCH v4 12/26] drm/sun4i: sun6i_mipi_dsi: Fix DSI hblk timing calculation Jagan Teki
2018-11-13 11:16 ` [PATCH v4 13/26] drm/sun4i: sun6i_mipi_dsi: Add DSI hblk packet overhead Jagan Teki
2018-11-13 11:16 ` [PATCH v4 14/26] drm/sun4i: sun6i_mipi_dsi: Fix DSI hfp timing value Jagan Teki
2018-11-13 11:16 ` [PATCH v4 15/26] drm/sun4i: sun6i_mipi_dsi: Set proper vblk timing calculation Jagan Teki
2018-11-13 11:16 ` [PATCH v4 16/26] drm/sun4i: sun6i_mipi_dsi: Add support for VCC-DSI voltage regulator Jagan Teki
2018-11-13 11:16 ` [PATCH v4 17/26] dt-bindings: sun6i-dsi: Add VCC-DSI supply property Jagan Teki
2018-11-16 23:19   ` Rob Herring
2018-11-13 11:16 ` [PATCH v4 18/26] dt-bindings: panel: Add Bananapi S070WV20-CT16 ICN6211 MIPI-DSI to RGB bridge Jagan Teki
2018-11-13 11:16 ` [PATCH v4 19/26] drm/panel: " Jagan Teki
2018-11-13 11:16 ` [PATCH v4 20/26] dt-bindings: panel: Add Techstar TS8550B MIPI-DSI panel Jagan Teki
2018-11-13 11:16 ` [PATCH v4 21/26] drm/panel: Add Techstar TS8550B MIPI-DSI LCD panel Jagan Teki
2018-11-13 11:16 ` [PATCH v4 22/26] clk: sunxi-ng: a64: Add min and max rate for PLL_MIPI Jagan Teki
2018-11-13 11:16 ` [PATCH v4 23/26] dt-bindings: sun6i-dsi: Add compatible for A64 DPHY Jagan Teki
2018-11-13 11:16 ` [PATCH v4 24/26] arm64: dts: allwinner: a64: Add DSI pipeline Jagan Teki
2018-11-13 11:16 ` [PATCH v4 25/26] [DO NOT MERGE] arm64: dts: allwinner: bananapi-m64: Bananapi S070WV20-CT16 DSI panel Jagan Teki
2018-11-13 12:22   ` Andre Przywara
2018-11-14  6:31     ` Jagan Teki
2018-11-14  6:58       ` Chen-Yu Tsai
2018-11-14  9:22         ` Chen-Yu Tsai
2018-11-14 11:18           ` Jagan Teki [this message]
2018-11-13 11:16 ` [PATCH v4 26/26] arm64: dts: allwinner: a64-amarula-relic: Enable Techstar TS8550B MIPI-DSI panel Jagan Teki
2018-11-13 12:32   ` Andre Przywara

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