linux-kernel - Re: [RFC 00/13] arm64: allwinner: Add A64 DE2 pipeline support

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Date:   Tue, 24 Apr 2018 16:08:50 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Jagan Teki <jagan@...rulasolutions.com>
Cc:     Chen-Yu Tsai <wens@...e.org>, Icenowy Zheng <icenowy@...c.io>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Michael Trimarchi <michael@...rulasolutions.com>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com
Subject: Re: [RFC 00/13] arm64: allwinner: Add A64 DE2 pipeline support

On Tue, Apr 24, 2018 at 07:04:12PM +0530, Jagan Teki wrote:
> Allwinner A64 has display engine pipeline like other Allwinner SOC's A83T/H3/H5.
> 
> A64 DE2 behaviour similar to Allwinner A83T where mixer0, connected to tcon0 with
> RGB, LVDS MIPI-DSI and mixer1, connected to tcon1 with HDMI.
> This series merely concentrated on HDMI pipeline and rest will add eventually.
> 
> patch 1: dt-bindings for a64 DE2 CCU
> 
> patch 2: a64 DE2 CCU node addition
> 
> patch 3: dt-bindings for a64 DE2 pipeline
> 
> patch 4 - 5: dt-bindings for a64 mixer0 and tcon-lcd
> 
> patch 6: a64 DE2 pipeline node addition
> 
> patch 7 - 8: dt-bindings for a64 HDMI and HDMI PHY
> 
> patch 9: a64 HDMI nodes addition
> 
> patch 10 - 11: dt-bindings for a64 mixer1 and tcon-tv
> 
> patch 12: a64 HDMI pipeline
> 
> patch 13: enable HDMI out on bananpi-m64
> 
> Tested HDMI on bananapi-m64 (along with DE2 SRAM C changes from [1]
> thread), able to detect the HDMI but, no penguins on screen.
> 
> Request for any suggestions.
> 
> Test log on Bananpi-m64:
> [    0.247631] sun4i-drm display-engine: bound 1100000.mixer (ops sun8i_mixer_ops)
> [    0.256717] sun4i-drm display-engine: bound 1200000.mixer (ops sun8i_mixer_ops)
> [    0.256783] sun4i-tcon 1c0c000.lcd-controller: Missing LVDS properties, Please upgrade your DT
> [    0.256792] sun4i-tcon 1c0c000.lcd-controller: LVDS output disabled

That doesn't seem to work so well for LVDS.

> [    0.257081] sun4i-drm display-engine: No panel or bridge found... RGB output disabled
> [    0.257099] sun4i-drm display-engine: bound 1c0c000.lcd-controller (ops sun4i_tcon_ops)
> [    0.257273] sun4i-drm display-engine: No panel or bridge found... RGB output disabled
> [    0.257288] sun4i-drm display-engine: bound 1c0d000.lcd-controller (ops sun4i_tcon_ops)
> [    0.258176] sun8i-dw-hdmi 1ee0000.hdmi: Detected HDMI TX controller v1.32a with HDCP (sun8i_dw_hdmi_p)
> [    0.258596] sun8i-dw-hdmi 1ee0000.hdmi: registered DesignWare HDMI I2C bus driver
> [    0.259188] sun4i-drm display-engine: bound 1ee0000.hdmi (ops sun8i_dw_hdmi_ops)
> [    0.259199] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
> [    0.259205] [drm] No driver support for vblank timestamp query.
> [    0.259308] [drm] Cannot find any crtc or sizes

A good guess would be that you can't get the EDIDs for some
reason. Have you tried forcing a mode to see if the display part
already works?

Maxime

-- 
Maxime Ripard, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com

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