linux-kernel - Re: [PATCH 4/4] ASoC: amd: enabling bt i2s config after acp reset

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Date:   Tue, 17 Apr 2018 16:12:24 +0530
From:   "Agrawal, Akshu" <Akshu.Agrawal@....com>
To:     Vijendar Mukunda <Vijendar.Mukunda@....com>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        Alex Deucher <alexander.deucher@....com>,
        Dylan Reid <dgreid@...omium.org>,
        Jason Clinton <jclinton@...omium.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "moderated list:SOUND - SOC LAYER / DYNAMIC AUDIO POWER MANAGEM..." 
        <alsa-devel@...a-project.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/4] ASoC: amd: enabling bt i2s config after acp reset



On 4/17/2018 10:29 AM, Vijendar Mukunda wrote:
> On ST/CZ based platforms, for specific platform bt uart
> mux to be defined for bt i2s.
> By default, these pins will be used for uart.
> After acp reset , it requires to reprogram bt i2s config
> mux pins to enable bt i2s instance.
> added bt i2s enablement sequence during acp init.
> 
> Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@....com>
> Signed-off-by: Akshu Agrawal <akshu.agrawal@....com>
> ---
>   sound/soc/amd/acp-da7219-max98357a.c | 2 ++
>   sound/soc/amd/acp-pcm-dma.c          | 9 +++++++++
>   sound/soc/amd/acp.h                  | 1 +
>   3 files changed, 12 insertions(+)
> 
> diff --git a/sound/soc/amd/acp-da7219-max98357a.c b/sound/soc/amd/acp-da7219-max98357a.c
> index b205c78..6dad0cb 100644
> --- a/sound/soc/amd/acp-da7219-max98357a.c
> +++ b/sound/soc/amd/acp-da7219-max98357a.c
> @@ -44,6 +44,7 @@
>   
>   static struct snd_soc_jack cz_jack;
>   struct clk *da7219_dai_clk;
> +extern int bt_pad_enable;
>   
>   static int cz_da7219_init(struct snd_soc_pcm_runtime *rtd)
>   {
> @@ -81,6 +82,7 @@ static int cz_da7219_init(struct snd_soc_pcm_runtime *rtd)
>   	}
>   
>   	da7219_aad_jack_det(component, &cz_jack);
> +	bt_pad_enable = device_property_read_bool(&pdev->dev, "bt-pad-enable");

This is to be done in probe.

>   
>   	return 0;
>   }
> diff --git a/sound/soc/amd/acp-pcm-dma.c b/sound/soc/amd/acp-pcm-dma.c
> index 7c392fe..b52c660 100644
> --- a/sound/soc/amd/acp-pcm-dma.c
> +++ b/sound/soc/amd/acp-pcm-dma.c
> @@ -46,6 +46,8 @@
>   
>   #define DRV_NAME "acp_audio_dma"
>   
> +bool bt_pad_enable = false;
> +EXPORT_SYMBOL(bt_pad_enable);
>   
>   static const struct snd_pcm_hardware acp_pcm_hardware_playback = {
>   	.info = SNDRV_PCM_INFO_INTERLEAVED |
> @@ -525,6 +527,13 @@ static int acp_init(void __iomem *acp_mmio, u32 asic_type)
>   	val &= ~ACP_SOFT_RESET__SoftResetAud_MASK;
>   	acp_reg_write(val, acp_mmio, mmACP_SOFT_RESET);
>   
> +	/* For BT instance change pins from UART to BT */
> +	if (bt_pad_enable) {
> +		val = acp_reg_read(acp_mmio, mmACP_BT_UART_PAD_SEL);
> +		val |= ACP_BT_UART_PAD_SELECT_MASK;
> +		acp_reg_write(val, acp_mmio, mmACP_BT_UART_PAD_SEL);
> +	}
> +
>   	/* initiailize Onion control DAGB register */
>   	acp_reg_write(ACP_ONION_CNTL_DEFAULT, acp_mmio,
>   		      mmACP_AXI2DAGB_ONION_CNTL);
> diff --git a/sound/soc/amd/acp.h b/sound/soc/amd/acp.h
> index 460365c..6b43144 100644
> --- a/sound/soc/amd/acp.h
> +++ b/sound/soc/amd/acp.h
> @@ -107,6 +107,7 @@
>   #define ACP_I2S_MIC_16BIT_RESOLUTION_EN 0x01
>   #define ACP_I2S_SP_16BIT_RESOLUTION_EN	0x02
>   #define ACP_I2S_BT_16BIT_RESOLUTION_EN	0x04
> +#define ACP_BT_UART_PAD_SELECT_MASK	0x1
>   
>   enum acp_dma_priority_level {
>   	/* 0x0 Specifies the DMA channel is given normal priority */
>