From: Stefan Agner <stefan@agner.ch>
To: Tomi Valkeinen <tomi.valkeinen@ti.com>,
Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Maxime Ripard <maxime.ripard@bootlin.com>,
Thierry Reding <thierry.reding@gmail.com>,
dri-devel@lists.freedesktop.org
Subject: Re: [PATCH v2 2/2] drm: Use new DRM_BUS_FLAG_*_(DRIVE|SAMPLE)_(POS|NEG)EDGE flags
Date: Wed, 05 Dec 2018 13:21:56 +0100 [thread overview]
Message-ID: <8d69478ea8f88340971a29b3dfdcbb58@agner.ch> (raw)
In-Reply-To: <9b0969b8-f0ad-1c95-7eb0-f36044466ada@ti.com>
On 05.12.2018 11:42, Tomi Valkeinen wrote:
> Hi,
>
> On 05/12/18 10:49, Laurent Pinchart wrote:
>> From: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
>>
>> The DRM_BUS_FLAG_PIXDATA_(POS|NEG)EDGE and
>> DRM_BUS_FLAG_SYNC_(POS|NEG)EDGE flags are deprecated in favour of the
>> new DRM_BUS_FLAG_PIXDATA_(DRIVE|SAMPLE)_(POS|NEG)EDGE and
>> new DRM_BUS_FLAG_SYNC_(DRIVE|SAMPLE)_(POS|NEG)EDGE flags. Replace them
>> through the code.
>>
>> This effectively changes the value of the .sampling_edge bridge timings
>> field in the dumb-vga-dac driver. This is safe to do as no driver
>> consumes these values yet.
>
> When to use which?
I guess whatever works best, e.g. if a display controller uses the
sample perspective, to describe its register, I would use the matching
defines.
>
> Looking at the omap drivers, you use the DRIVE variant. But if the
> encoder/panel is describing what it wants as input, shouldn't it use the
> SAMPLE variant?
If it is fine to use either one in display controllers or displays, I
guess that is fine. I'd rather prefer a mechanical change right now, and
do logical fixes on a per case basis. However, in this patch the
dumb-vga-dac.c case already breaks that rule. Maybe it should be a
separate patch?
--
Stefan
>
> Tomi
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next prev parent reply other threads:[~2018-12-05 12:21 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-05 8:49 [PATCH v2 0/2] Clarify display info PIXDATA bus flags Laurent Pinchart
2018-12-05 8:49 ` [PATCH v2 1/2] drm: Clarify definition of the DRM_BUS_FLAG_(PIXDATA|SYNC)_* macros Laurent Pinchart
2018-12-05 8:49 ` [PATCH v2 2/2] drm: Use new DRM_BUS_FLAG_*_(DRIVE|SAMPLE)_(POS|NEG)EDGE flags Laurent Pinchart
2018-12-05 10:42 ` Tomi Valkeinen
2018-12-05 12:21 ` Stefan Agner [this message]
2018-12-09 23:52 ` Laurent Pinchart
2018-12-09 23:51 ` Laurent Pinchart
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