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SubjectRe: [PATCH v3 2/2] arm64: dts: rockchip: add HDMI sound node for rk3328-rock64
Date
On 2019-03-02 15:19, Katsuhiro Suzuki wrote:
> Ping...
>
> On 2019/02/18 2:34, Katsuhiro Suzuki wrote:
>> This patch adds HDMI sound (I2S0) node for rock64.
>>
>> After apply this patch, UART2 will fail to allocate DMA resources
>> but UART driver can work fine without DMA.
>>
>> This error is related to the DMAC of rk3328 (pl330 or compatible).
>> DMAC connected to 16 DMA sources. Each sources have ID number that is
>> called 'Req number' in rk3328 TRM. Currently total 7 sources has been
>> activated as follows:
>>
>> | Req number | Source | Required |
>> | | | channels |
>> |------------+--------+-----------|
>> | 14, 15 | I2S1 | 2ch |
>> | 6, 7 | UART2 | 2ch |
>> | 10 | SPDIF | 1ch |
>> | 8, 9 | SPI0 | 2ch |
>> |------------+--------+-----------|
>> | | Total | 7ch |
>>
>> HDMI audio needs to activate new source I2S0 (Req number 11 and 12).
>> I2S0 can work concurrently with other sources, but rk3328 DMAC can
>> use max 8 channels at same time. If I2S0 is simply activated by this
>> patch, required DMAC channels will be 9. So last one (UART2) cannot
>> allocate the DMA resources.
>>
>> Virt-dma mechanism for pl0330 DMAC driver is needed to fix this
>> problem.
>>
>> Signed-off-by: Katsuhiro Suzuki <katsuhiro@katsuster.net>
>> ---
>> .../arm64/boot/dts/rockchip/rk3328-rock64.dts | 21 ++++++++++++++++++-
>> 1 file changed, 20 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/arm64/boot/dts/rockchip/rk3328-rock64.dts b/arch/arm64/boot/dts/rockchip/rk3328-rock64.dts
>> index 2157a528276b..bfc0930d245c 100644
>> --- a/arch/arm64/boot/dts/rockchip/rk3328-rock64.dts
>> +++ b/arch/arm64/boot/dts/rockchip/rk3328-rock64.dts
>> @@ -68,7 +68,8 @@
>> sound {
>> compatible = "audio-graph-card";
>> label = "rockchip,rk3328";
>> - dais = <&i2s1_p0
>> + dais = <&i2s0_p0
>> + &i2s1_p0
>> &spdif_p0>;

I am working on multi-channel hdmi audio support for dw-hdmi at [1] and are wondering if having multiple dais on one graph card
instead of a separate hdmi sound card will affect the ability to define a proper alsa config for multi channel hdmi sound.

[1] https://github.com/Kwiboo/linux-rockchip/compare/8874c206d613dc575f5cb6e385e7a866020138d0...92b20eaa6b6dd2cf3418a428f905d10bbc62724f

Regards,
Jonas

>> };
>>
>> @@ -141,6 +142,12 @@
>>
>> &hdmi {
>> status = "okay";
>> +
>> + port@0 {
>> + hdmi_p0_0: endpoint {
>> + remote-endpoint = <&i2s0_p0_0>;
>> + };
>> + };
>> };
>>
>> &hdmiphy {
>> @@ -256,6 +263,18 @@
>> };
>> };
>>
>> +&i2s0 {
>> + status = "okay";
>> +
>> + i2s0_p0: port {
>> + i2s0_p0_0: endpoint {
>> + dai-format = "i2s";
>> + mclk-fs = <256>;
>> + remote-endpoint = <&hdmi_p0_0>;
>> + };
>> + };
>> +};
>> +
>> &i2s1 {
>> status = "okay";
>>
>>
>
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