From: sebastian.hesselbarth@gmail.com (Sebastian Hesselbarth)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 5/5] DRM: Armada: add support for drm tda19988 driver
Date: Mon, 07 Oct 2013 18:08:12 +0200 [thread overview]
Message-ID: <5252DC6C.9060503@gmail.com> (raw)
In-Reply-To: <20131007155326.GP21581@sirena.org.uk>
On 10/07/2013 05:53 PM, Mark Brown wrote:
> On Mon, Oct 07, 2013 at 01:29:30PM +0200, Sebastian Hesselbarth wrote:
>
>> I2S _can_ support more than two channels, but only if you wire up more
>> DATA lines. Those are not available on Dove, so its I2S is limited to
>> two channel audio.
>
> A lot of devices implement extra channels with TDM rather than with
> extra wires - you get all the left channels and all the right channels
> grouped together (like with DSP/PCM modes except the channels are
> ordered differently). I'm never sure that's actually useful, though,
> since it's not something that just works with most hosts that don't
> understand it in hardware and most of those can do DSP/PCM anyway.
True, I didn't mention TDM modes squeezing multiple channels into one
L/R frame. Neither Dove nor TDA998x support this, but thanks for the
clarification.
WARNING: multiple messages have this Message-ID (diff)
From: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
To: Mark Brown <broonie@kernel.org>
Cc: Jean-Francois Moine <moinejf@free.fr>,
Russell King - ARM Linux <linux@arm.linux.org.uk>,
Jason Cooper <jason@lakedaemon.net>,
David Airlie <airlied@linux.ie>,
dri-devel@lists.freedesktop.org, Rob Clark <robdclark@gmail.com>,
Daniel Vetter <daniel@ffwll.ch>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 5/5] DRM: Armada: add support for drm tda19988 driver
Date: Mon, 07 Oct 2013 18:08:12 +0200 [thread overview]
Message-ID: <5252DC6C.9060503@gmail.com> (raw)
In-Reply-To: <20131007155326.GP21581@sirena.org.uk>
On 10/07/2013 05:53 PM, Mark Brown wrote:
> On Mon, Oct 07, 2013 at 01:29:30PM +0200, Sebastian Hesselbarth wrote:
>
>> I2S _can_ support more than two channels, but only if you wire up more
>> DATA lines. Those are not available on Dove, so its I2S is limited to
>> two channel audio.
>
> A lot of devices implement extra channels with TDM rather than with
> extra wires - you get all the left channels and all the right channels
> grouped together (like with DSP/PCM modes except the channels are
> ordered differently). I'm never sure that's actually useful, though,
> since it's not something that just works with most hosts that don't
> understand it in hardware and most of those can do DSP/PCM anyway.
True, I didn't mention TDM modes squeezing multiple channels into one
L/R frame. Neither Dove nor TDA998x support this, but thanks for the
clarification.
next prev parent reply other threads:[~2013-10-07 16:08 UTC|newest]
Thread overview: 86+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-06 22:07 [PATCH 0/5] Armada DRM stuff Russell King - ARM Linux
2013-10-06 22:07 ` Russell King - ARM Linux
2013-10-06 22:07 ` [PATCH 1/5] drm/i2c: tda998x: set VIF for full range, underscanned display Russell King
2013-10-06 22:07 ` Russell King
2013-10-07 8:59 ` Jean-Francois Moine
2013-10-07 8:59 ` Jean-Francois Moine
2013-10-18 15:00 ` Rob Clark
2013-10-18 15:00 ` Rob Clark
2013-10-06 22:08 ` [PATCH 2/5] DRM: Armada: Add Armada DRM driver Russell King
2013-10-06 22:08 ` Russell King
2013-10-10 21:25 ` Rob Clark
2013-10-10 21:25 ` Rob Clark
2013-10-10 21:59 ` Russell King - ARM Linux
2013-10-10 21:59 ` Russell King - ARM Linux
2013-10-10 22:23 ` Rob Clark
2013-10-10 22:23 ` Rob Clark
2013-10-10 22:53 ` Russell King - ARM Linux
2013-10-10 22:53 ` Russell King - ARM Linux
2013-10-11 0:10 ` Rob Clark
2013-10-11 0:10 ` Rob Clark
2013-10-06 22:09 ` [PATCH 3/5] DRM: Armada: Add support for ARGB 32x64 or 64x32 hardware cursors Russell King
2013-10-06 22:09 ` Russell King
2013-10-07 9:01 ` Jean-Francois Moine
2013-10-07 9:01 ` Jean-Francois Moine
2013-10-07 9:40 ` Russell King - ARM Linux
2013-10-07 9:40 ` Russell King - ARM Linux
2013-10-07 10:09 ` Jean-Francois Moine
2013-10-07 10:09 ` Jean-Francois Moine
2013-10-07 10:32 ` Russell King - ARM Linux
2013-10-07 10:32 ` Russell King - ARM Linux
2013-10-07 12:29 ` Siarhei Siamashka
2013-10-07 12:29 ` Siarhei Siamashka
2013-10-07 12:50 ` Russell King - ARM Linux
2013-10-07 12:50 ` Russell King - ARM Linux
2013-10-17 23:58 ` Rob Clark
2013-10-17 23:58 ` Rob Clark
2013-10-18 14:31 ` Alex Deucher
2013-10-18 14:31 ` Alex Deucher
2013-10-06 22:10 ` [PATCH 4/5] DRM: Armada: start of MMP2/MMP3 support Russell King
2013-10-06 22:10 ` Russell King
2013-10-18 0:11 ` Rob Clark
2013-10-18 0:11 ` Rob Clark
2013-10-06 22:11 ` [PATCH 5/5] DRM: Armada: add support for drm tda19988 driver Russell King
2013-10-06 22:11 ` Russell King
2013-10-07 9:18 ` Jean-Francois Moine
2013-10-07 9:18 ` Jean-Francois Moine
2013-10-07 9:44 ` Russell King - ARM Linux
2013-10-07 9:44 ` Russell King - ARM Linux
2013-10-07 10:48 ` Jean-Francois Moine
2013-10-07 10:48 ` Jean-Francois Moine
2013-10-07 11:09 ` Russell King - ARM Linux
2013-10-07 11:09 ` Russell King - ARM Linux
2013-10-07 11:29 ` Sebastian Hesselbarth
2013-10-07 11:29 ` Sebastian Hesselbarth
2013-10-07 15:53 ` Mark Brown
2013-10-07 15:53 ` Mark Brown
2013-10-07 16:08 ` Sebastian Hesselbarth [this message]
2013-10-07 16:08 ` Sebastian Hesselbarth
2013-10-07 17:05 ` Mark Brown
2013-10-07 17:05 ` Mark Brown
2013-10-07 12:03 ` Jean-Francois Moine
2013-10-07 12:03 ` Jean-Francois Moine
2013-10-07 12:36 ` Russell King - ARM Linux
2013-10-07 12:36 ` Russell King - ARM Linux
2013-10-07 14:59 ` Rob Clark
2013-10-07 14:59 ` Rob Clark
2013-10-08 9:19 ` Jean-Francois Moine
2013-10-08 9:19 ` Jean-Francois Moine
2013-10-08 9:49 ` Russell King - ARM Linux
2013-10-08 9:49 ` Russell King - ARM Linux
2013-10-08 15:34 ` Jean-Francois Moine
2013-10-08 15:34 ` Jean-Francois Moine
2013-10-18 0:20 ` Rob Clark
2013-10-18 0:20 ` Rob Clark
2013-10-08 12:07 ` Rob Clark
2013-10-08 12:07 ` Rob Clark
2013-10-07 21:47 ` [PATCH 0/5] Armada DRM stuff Sebastian Hesselbarth
2013-10-07 21:47 ` Sebastian Hesselbarth
2013-10-09 14:31 ` Russell King - ARM Linux
2013-10-09 14:31 ` Russell King - ARM Linux
2013-10-09 14:48 ` Rob Clark
2013-10-09 14:48 ` Rob Clark
2013-10-18 15:15 ` [GIT PULL] Armada DRM support Russell King - ARM Linux
2013-10-18 15:15 ` Russell King - ARM Linux
2013-10-22 13:36 ` Russell King - ARM Linux
2013-10-22 13:36 ` Russell King - ARM Linux
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