linux-kernel - Re: [PATCH v9 0/4] drm/atmel-hlcdc: bus-width override support

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Date:   Mon, 27 Aug 2018 21:24:49 +0200
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     Peter Rosin <peda@...ntia.se>
Cc:     linux-kernel@...r.kernel.org, David Airlie <airlied@...ux.ie>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, Jyri Sarha <jsarha@...com>,
        Daniel Vetter <daniel@...ll.ch>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Jacopo Mondi <jacopo+renesas@...ndi.org>,
        Sakari Ailus <sakari.ailus@....fi>
Subject: Re: [PATCH v9 0/4] drm/atmel-hlcdc: bus-width override support

On Sat, 25 Aug 2018 10:56:16 +0200
Peter Rosin <peda@...ntia.se> wrote:

> Hi!
> 
> The background for these patches is that our PCB interface between
> the SAMA5D3 and the ds90c185 lvds encoder is only using 16 bits, and
> this has to be described somewhere, or the atmel-hlcdc driver have no
> chance of selecting the correct output mode. Since we have similar
> problems with a tda19988 HDMI encoder I added patches to override
> the atmel-hlcdc output format via DT properties compatible with the
> media video-interface binding and things start to play together.

Queued to drm-misc-next.

Thanks,

Boris

> 
> Cheers,
> Peter
> 
> Changes since v8  https://lkml.org/lkml/2018/8/10/309
> - go back to the solution in v7 (but the ep device_node leak fixed)
>   for patch 4/4
> - redo (part of) 3/4 w/o using the disliked of_graph_parse_endpoint
> 
> Changes since v7  https://lkml.org/lkml/2018/8/4/288
> - The ep device_node was leaked in v7 patch 3/3, so add patch 3/4
>   which simplifies fixing this in patch 4/4 (and adds flexibility)
>   and adjust patch 4/4 to the changes done in the new 3/4.
> - return -ENOMEM on allocation failure in patch 4/4
> 
> Changes since v6  https://lkml.org/lkml/2018/8/3/333
> - zap bus-type from the binding in patch 2/3
> 
> Changes since (the shortened) v5  https://lkml.org/lkml/2018/8/3/182
> - add reg properties (and #*-cells) to the example in patch 2/3
> - prohibit bus-width 0 in the device-tree in patch 3/3
> - added reviewed-by from Jacopo to patch 2/3 and 3/3
> 
> Peter Rosin (4):
>   dt-bindings: display: bridge: lvds-transmitter: add ti,ds90c185
>   dt-bindings: display: atmel: optional video-interface of endpoints
>   drm/atmel-hlcdc: always iterate over the first 4 output endpoints
>   drm/atmel-hlcdc: support bus-width (12/16/18/24) in endpoint nodes
> 
>  .../devicetree/bindings/display/atmel/hlcdc-dc.txt | 23 ++++++
>  .../bindings/display/bridge/lvds-transmitter.txt   |  8 +-
>  drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c     | 70 +++++++++++-----
>  drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h       |  1 +
>  drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c   | 92 +++++++++++++++++++---
>  5 files changed, 163 insertions(+), 31 deletions(-)
>