<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <meta name="Generator" content="Microsoft Word 14 (filtered medium)"> <style></style> </head> <body lang="EN-US" link="blue" vlink="purple"> <div class="WordSection1"> Hi Raymond,<o:p></o:p> <o:p> </o:p> <div style="border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt"> <div> <div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in"> From: Raymond Yau [mailto:superquad.vortex2@gmail.com] Sent: Monday, August 10, 2015 12:23 PM To: Yang, Libin Cc: alsa-devel@alsa-project.org; Takashi Iwai; Lin, Mengdong; intel-gfx@lists.freedesktop.org Subject: RE: [alsa-devel] [PATCH 3/4] ALSA: hda - display audio call ncts callback<o:p></o:p> </div> </div> <o:p> </o:p> 2015-8-10 上午11:15於 "Yang, Libin" <<a href="mailto:libin.yang@intel.com">libin.yang@intel.com</a>>寫道： > > Hi Raymond, > > > > > > > } > > > > > > > > + if (is_haswell_plus(codec)) { > > > > + if (acomp && acomp->ops && acomp->ops->set_ncts) > > > > + acomp->ops->set_ncts(acomp->dev, per_pin- > > > >pin_nid - 4, > > > > > > Please describe more how "pin_nid - 4" is supposed to work. Also... > > > > OK, I see. > > > > > > > > > + 0, runtime->rate); > > > > > > ... this implies that no MST support included? > > > > We will support MST later. Currently I just add the > > interface to support MST, but not implementing it. > Refer to DCN HDA040-A > Multi-stream over Single Display Port > Can the driver use subdevices for those display port support multi streaming ? > > [Libin] What do you mean subdevice here, > using a struct device to represent a dev_entry or an int type?<o:p></o:p> <a href="http://git.kernel.org/cgit/linux/kernel/git/tiwai/hda-emu.git/tree/codecs/stac9227-intel-d946gzis-mobo?id=HEAD">http://git.kernel.org/cgit/linux/kernel/git/tiwai/hda-emu.git/tree/codecs/stac9227-intel-d946gzis-mobo?id=HEAD</a> <o:p></o:p> When HDA codecs have three Audio Input widgets, the driver create three subdevices for those desktop which have three or more input sources in the past<o:p></o:p> This is what we are thinking currently. Different companies <o:p></o:p> have different implementation. On currently Intel platforms, <o:p></o:p> it may show several pin widgets and each pin widget has<o:p></o:p> several device entry. But it actually only support 3 streams.<o:p></o:p> Mengdong is thinking to use dynamic PCM to implement it,<o:p></o:p> and so we don’t need each subdevice for each device entry.<o:p></o:p> I’m not sure we will use what solution. It seems it is a<o:p></o:p> good open question to discuss.<o:p></o:p> <o:p> </o:p> Regards,<o:p></o:p> Libin<o:p></o:p> <o:p> </o:p> ARECORD<o:p></o:p> **** List of CAPTURE Hardware Devices **** card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog] Subdevices: 3/3 Subdevice #0: subdevice #0 Subdevice #1: subdevice #1 Subdevice #2: subdevice #2<o:p></o:p> With the auto generic parser , the driver create one subdevice for Analog two subdevices for Alt Analog <o:p></o:p> **** List of CAPTURE Hardware Devices **** card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: Intel [HDA Intel], device 2: STAC92xx Alt Analog [STAC92xx Alt Analog] Subdevices: 2/2 Subdevice #0: subdevice #0 Subdevice #1: subdevice #1<o:p></o:p> > > The specification allow up to 64 device entries > This mean the number of subdevices is equal to the device list length > More than one audio output /converters can be connected to the multi stream displayport pin widget but different device entry while only one audio output can be dynamically allocated to other HDMI pin widget > > [Libin] Yes, Pin widget can have multiple device entry and connecting different converters. The audio output will be based on device entry.<o:p></o:p> </div> </div> </body> </html>