linux-kernel - Re: [PATCH v3 2/2] arm64: dts: rockchip: add HDMI sound node for rk3328-rock64

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Date:   Sat, 2 Mar 2019 17:20:33 +0000
From:   Jonas Karlman <jonas@...boo.se>
To:     Katsuhiro Suzuki <katsuhiro@...suster.net>,
        Heiko Stuebner <heiko@...ech.de>,
        "linux-rockchip@...ts.infradead.org" 
        <linux-rockchip@...ts.infradead.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 2/2] arm64: dts: rockchip: add HDMI sound node for
 rk3328-rock64

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@...suster.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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