linux-kernel - [PATCH 0/2] HDMI Audio on RK356x/Quartz64 Model A

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Message-Id: <20211125100836.423808-1-frattaroli.nicolas@gmail.com>
Date:   Thu, 25 Nov 2021 11:08:33 +0100
From:   Nicolas Frattaroli <frattaroli.nicolas@...il.com>
To:     Rob Herring <robh+dt@...nel.org>, Heiko Stuebner <heiko@...ech.de>
Cc:     Nicolas Frattaroli <frattaroli.nicolas@...il.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 0/2] HDMI Audio on RK356x/Quartz64 Model A

This enables HDMI audio on Quartz64 Model A, and the RK356x SoC in
general. The patches require the VOP2 patchset[1] and my I2S/TDM
controller fix[2] to work.

i2s0 on the RK356x is connected to HDMI, and only has one DMA. I've
confirmed this with the TRM. With [2] the driver now handles this
properly, and does not try to register a capture PCM in this case.

To test this, one needs a video clock, i.e. there is no audio if your
screen is off. I've found that running kmscube momentarily is enough
to make the VOP2 keep the screen turned on indefinitely, which is
a pleasant quirk in this case.

[1]: https://patchwork.kernel.org/project/linux-rockchip/list/?series=581709
[2]: https://patchwork.kernel.org/project/linux-rockchip/patch/20211125084900.417102-1-frattaroli.nicolas@gmail.com/

Nicolas Frattaroli (2):
  arm64: dts: rockchip: rk356x: Add HDMI audio nodes
  arm64: dts: rockchip: Enable HDMI audio on Quartz64 A

 .../boot/dts/rockchip/rk3566-quartz64-a.dts   |  8 +++++
 arch/arm64/boot/dts/rockchip/rk356x.dtsi      | 32 +++++++++++++++++++
 2 files changed, 40 insertions(+)

-- 
2.34.0