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Message-ID: <Z8ikt2K0uekU2dVZ@linaro.org> Date: Wed, 5 Mar 2025 20:23:35 +0100 From: Stephan Gerhold <stephan.gerhold@...aro.org> To: Wesley Cheng <quic_wcheng@...cinc.com> Cc: Greg KH <gregkh@...uxfoundation.org>, srinivas.kandagatla@...aro.org, mathias.nyman@...el.com, perex@...ex.cz, conor+dt@...nel.org, dmitry.torokhov@...il.com, corbet@....net, broonie@...nel.org, lgirdwood@...il.com, tiwai@...e.com, krzk+dt@...nel.org, pierre-louis.bossart@...ux.intel.com, Thinh.Nguyen@...opsys.com, robh@...nel.org, linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, linux-sound@...r.kernel.org, linux-input@...r.kernel.org, linux-usb@...r.kernel.org, linux-arm-msm@...r.kernel.org, linux-doc@...r.kernel.org Subject: Re: [PATCH v35 00/31] Introduce QC USB SND audio offloading support On Tue, Mar 04, 2025 at 02:46:28PM -0800, Wesley Cheng wrote: > On 3/4/2025 12:22 AM, Stephan Gerhold wrote: > > On Mon, Mar 03, 2025 at 06:39:52PM -0800, Wesley Cheng wrote: > >> On 2/19/2025 3:24 AM, Stephan Gerhold wrote: > >>> On Tue, Feb 18, 2025 at 04:47:23PM -0800, Wesley Cheng wrote: > >>>> Requesting to see if we can get some Acked-By tags, and merge on usb-next. > >>>> > >>>> Several Qualcomm based chipsets can support USB audio offloading to a > >>>> dedicated audio DSP, which can take over issuing transfers to the USB > >>>> host controller. The intention is to reduce the load on the main > >>>> processors in the SoC, and allow them to be placed into lower power modes. > >>>> There are several parts to this design: > >>>> 1. Adding ASoC binding layer > >>>> 2. Create a USB backend for Q6DSP > >>>> 3. Introduce XHCI interrupter support > >>>> 4. Create vendor ops for the USB SND driver > >>>> > >>>> USB | ASoC > >>>> -------------------------------------------------------------------- > >>>> | _________________________ > >>>> | |sm8250 platform card | > >>>> | |_________________________| > >>>> | | | > >>>> | ___V____ ____V____ > >>>> | |Q6USB | |Q6AFE | > >>>> | |"codec" | |"cpu" | > >>>> | |________| |_________| > >>>> | ^ ^ ^ > >>>> | | |________| > >>>> | ___V____ | > >>>> | |SOC-USB | | > >>>> ________ ________ | | | > >>>> |USB SND |<--->|QC offld|<------------>|________| | > >>>> |(card.c)| | |<---------- | > >>>> |________| |________|___ | | | > >>>> ^ ^ | | | ____________V_________ > >>>> | | | | | |APR/GLINK | > >>>> __ V_______________V_____ | | | |______________________| > >>>> |USB SND (endpoint.c) | | | | ^ > >>>> |_________________________| | | | | > >>>> ^ | | | ___________V___________ > >>>> | | | |->|audio DSP | > >>>> ___________V_____________ | | |_______________________| > >>>> |XHCI HCD |<- | > >>>> |_________________________| | > >>>> > >>> > >>> As I noted on v34 [1], this version is still missing instructions and > >>> changes needed for testing this series. The device tree changes don't > >>> need to be part of the same series, but there should be at least a link > >>> provided to give other people the chance to provide Tested-by tags. > >>> > >>> IMO we shouldn't merge this series without those instructions, otherwise > >>> we risk that this just ends up being dead code that no one can use. > >>> > >>> Can you please share the device tree changes for a board upstream and > >>> any other changes needed to be able to test this series? E.g. for > >>> sm8250-mtp.dts, based on the examples in your cover letter. > >>> > >> > >> To clarify I'm testing this on sm8350 in recent times, but utilizing sm8250 > >> definitions for the ASoC platform card, as the platform sound card is more > >> or less the same between the two SoCs. Back > >> when I started this series, sm8350 was missing a bunch of dependent > >> components, such as aDSP not being loaded, and missing platform sound card > >> definition, so I had to define and enable those on my own, which required a > >> slew of new DT nodes, hence why it wasn't as straight forward to include > >> the DT definitions yet for sm8350. Not thinking that this series would > >> take as long as it did, I was planning on separating out the DT changes in > >> a different series to enable offloading for the devices I have tested with. > >> (sm8150, sm8250 and sm8350) > >> > >> There's still a pretty big chunk of dependencies missing from sm8350, so > >> those would also be handled in the follow up DT submission. For now, its a > >> much bigger hurdle to get the main/functional changes in, and that was > >> taking a significant amount of time from my end to manage. > >> > >> If you want, I can give you the changes I have offline to enable this for > >> sm8350, since I haven't spent time formatting/prepping the changes for > >> submission yet. > >> > > > > Can you push it to a public branch somewhere (e.g. on CodeLinaro)? I was > > talking to some people from the community about testing this on some of > > the smartphones we have in upstream, so it wouldn't help if I just have > > the changes privately. > > Which CLO project/branch did you want me to push it to? Sorry, I haven't > worked too much with the CLO open branches. I have an account though. > Any project/branch is fine for me, I suggested CLO only because I assumed you already have an account there. You should be able to create a personal project and push it there. You could also use the fork button on https://git.codelinaro.org/linaro/linux/kernel/torvalds/linux to avoid having to push the full history yourself. It should result in a project similar to mine: https://git.codelinaro.org/stephan.gerhold/linux Thanks, Stephan
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