exynos drm hdmi audio: how to recieve audio parameters (sf, bps, channel count)

[Kyungmin Park]

Hi, 

 

I bet 1st option. And configure it at user space. IOW set the proper ALSA
kcontrol. And set the proper DRM audio config by IOCTL..

Any other opinions?

Thank you,
Kyungmin Park

From: RAHUL SHARMA [mailto:rahul.sharma at samsung.com] 
Sent: Thursday, July 19, 2012 6:57 PM
To: dri-devel at lists.freedesktop.org; SUNIL JOSHI; PRASHANTH GODREHAL;
Prathyush Kalashwaram; PADMAVATHI VENNA; CHANDRASEKAR RAMAKRISHNAN; SHIRISH
S; FAHAD KUNNATHADI; SUNIL M; Joonyoung Shim; Seung-Woo Kim;
inki.dae at samsung.com; kyungmin.park at samsung.com
Subject: Fwd: exynos drm hdmi audio: how to recieve audio parameters (sf,
bps, channel count)

 

Hi Inki,

 

Please suggest me a solution for this problem.

 

regards,

Rahul Sharma

 

------- Original Message -------

Sender : RAHUL SHARMA<rahul.sharma at samsung.com> ./Technical
Manager/SISO-Solution 1/Samsung Electronics

Date : Jul 17, 2012 11:42 (GMT+05:30)

Title : exynos drm hdmi audio: how to recieve audio parameters (sf, bps,
channel count)

 

hi,

I am adding support for hdmi audio, inside exynos drm hdmi driver. Hdmi
audio is initialized with default parameters. I want to implement the
mechanism to update hdmi registers, whenever audio properties got changed
(i2s/spdif). raedon/r600 drm dirver is polling the audio ip every 100 ms and
reconfigure the hdmi audio block. This is not possible with exynos as all
information cannot be collected from i2s tx registers. It is directly set on
wm8994 connected through i2c. 
Possible solution:
1) drm driver exposing ioctl for setting audio parameters.
2) alsa driver notifying the change in audio parameters through kernel
notifiers. drm hdmi driver subscribed for the same.

Please suggest me a good way to implement this.

regards,
Rahul Sharma. 

 

 

 




 

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