[PATCH V2 2/2] dmaengine: imx-sdma: support hdmi audio

[Joy Zou]

Gentle ping...

BR
Joy Zou
> -----Original Message-----
> From: Joy Zou
> Sent: 2022年8月2日 11:58
> To: vkoul at kernel.org
> Cc: S.J. Wang <shengjiu.wang at nxp.com>; shawnguo at kernel.org;
> s.hauer at pengutronix.de; kernel at pengutronix.de; festevam at gmail.com;
> dl-linux-imx <linux-imx at nxp.com>; dmaengine at vger.kernel.org;
> linux-arm-kernel at lists.infradead.org; linux-kernel at vger.kernel.org
> Subject: FW: [PATCH V2 2/2] dmaengine: imx-sdma: support hdmi audio
> 
> Gentle ping...
> 
> BR
> Joy Zou
> 
> -----Original Message-----
> From: Joy Zou
> Sent: 2022年5月24日 16:05
> To: vkoul at kernel.org
> Cc: S.J. Wang <shengjiu.wang at nxp.com>; shawnguo at kernel.org;
> s.hauer at pengutronix.de; kernel at pengutronix.de; festevam at gmail.com;
> dl-linux-imx <linux-imx at nxp.com>; dmaengine at vger.kernel.org;
> linux-arm-kernel at lists.infradead.org; linux-kernel at vger.kernel.org
> Subject: [PATCH V2 2/2] dmaengine: imx-sdma: support hdmi audio
> 
> Add hdmi audio support in sdma.
> 
> Signed-off-by: Joy Zou <joy.zou at nxp.com>
> ---
> Changes since v1:
> moved data type to include/linux/dma/imx-dma.h
> ---
>  drivers/dma/imx-sdma.c      | 38
> +++++++++++++++++++++++++++++--------
>  include/linux/dma/imx-dma.h |  1 +
>  2 files changed, 31 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c index
> 8535018ee7a2..e9b8b2e9f7c9 100644
> --- a/drivers/dma/imx-sdma.c
> +++ b/drivers/dma/imx-sdma.c
> @@ -941,7 +941,10 @@ static irqreturn_t sdma_int_handler(int irq, void
> *dev_id)
>  		desc = sdmac->desc;
>  		if (desc) {
>  			if (sdmac->flags & IMX_DMA_SG_LOOP) {
> -				sdma_update_channel_loop(sdmac);
> +				if (sdmac->peripheral_type != IMX_DMATYPE_HDMI)
> +					sdma_update_channel_loop(sdmac);
> +				else
> +					vchan_cyclic_callback(&desc->vd);
>  			} else {
>  				mxc_sdma_handle_channel_normal(sdmac);
>  				vchan_cookie_complete(&desc->vd);
> @@ -1061,6 +1064,10 @@ static int sdma_get_pc(struct sdma_channel
> *sdmac,
>  		per_2_emi = sdma->script_addrs->sai_2_mcu_addr;
>  		emi_2_per = sdma->script_addrs->mcu_2_sai_addr;
>  		break;
> +	case IMX_DMATYPE_HDMI:
> +		emi_2_per = sdma->script_addrs->hdmi_dma_addr;
> +		sdmac->is_ram_script = true;
> +		break;
>  	default:
>  		dev_err(sdma->dev, "Unsupported transfer type %d\n",
>  			peripheral_type);
> @@ -1112,11 +1119,16 @@ static int sdma_load_context(struct
> sdma_channel *sdmac)
>  	/* Send by context the event mask,base address for peripheral
>  	 * and watermark level
>  	 */
> -	context->gReg[0] = sdmac->event_mask[1];
> -	context->gReg[1] = sdmac->event_mask[0];
> -	context->gReg[2] = sdmac->per_addr;
> -	context->gReg[6] = sdmac->shp_addr;
> -	context->gReg[7] = sdmac->watermark_level;
> +	if (sdmac->peripheral_type == IMX_DMATYPE_HDMI) {
> +		context->gReg[4] = sdmac->per_addr;
> +		context->gReg[6] = sdmac->shp_addr;
> +	} else {
> +		context->gReg[0] = sdmac->event_mask[1];
> +		context->gReg[1] = sdmac->event_mask[0];
> +		context->gReg[2] = sdmac->per_addr;
> +		context->gReg[6] = sdmac->shp_addr;
> +		context->gReg[7] = sdmac->watermark_level;
> +	}
> 
>  	bd0->mode.command = C0_SETDM;
>  	bd0->mode.status = BD_DONE | BD_WRAP | BD_EXTD; @@ -1488,7
> +1500,7 @@ static struct sdma_desc *sdma_transfer_init(struct
> sdma_channel *sdmac,
>  	desc->sdmac = sdmac;
>  	desc->num_bd = bds;
> 
> -	if (sdma_alloc_bd(desc))
> +	if (bds && sdma_alloc_bd(desc))
>  		goto err_desc_out;
> 
>  	/* No slave_config called in MEMCPY case, so do here */ @@ -1653,13
> +1665,16 @@ static struct dma_async_tx_descriptor
> *sdma_prep_dma_cyclic(  {
>  	struct sdma_channel *sdmac = to_sdma_chan(chan);
>  	struct sdma_engine *sdma = sdmac->sdma;
> -	int num_periods = buf_len / period_len;
> +	int num_periods = 0;
>  	int channel = sdmac->channel;
>  	int i = 0, buf = 0;
>  	struct sdma_desc *desc;
> 
>  	dev_dbg(sdma->dev, "%s channel: %d\n", __func__, channel);
> 
> +	if (sdmac->peripheral_type != IMX_DMATYPE_HDMI)
> +		num_periods = buf_len / period_len;
> +
>  	sdma_config_write(chan, &sdmac->slave_config, direction);
> 
>  	desc = sdma_transfer_init(sdmac, direction, num_periods); @@ -1676,6
> +1691,9 @@ static struct dma_async_tx_descriptor *sdma_prep_dma_cyclic(
>  		goto err_bd_out;
>  	}
> 
> +	if (sdmac->peripheral_type == IMX_DMATYPE_HDMI)
> +		return vchan_tx_prep(&sdmac->vc, &desc->vd, flags);
> +
>  	while (buf < buf_len) {
>  		struct sdma_buffer_descriptor *bd = &desc->bd[i];
>  		int param;
> @@ -1736,6 +1754,10 @@ static int sdma_config_write(struct dma_chan
> *chan,
>  		sdmac->watermark_level |= (dmaengine_cfg->dst_maxburst << 16) &
>  			SDMA_WATERMARK_LEVEL_HWML;
>  		sdmac->word_size = dmaengine_cfg->dst_addr_width;
> +	} else if (sdmac->peripheral_type == IMX_DMATYPE_HDMI) {
> +		sdmac->per_address = dmaengine_cfg->dst_addr;
> +		sdmac->per_address2 = dmaengine_cfg->src_addr;
> +		sdmac->watermark_level = 0;
>  	} else {
>  		sdmac->per_address = dmaengine_cfg->dst_addr;
>  		sdmac->watermark_level = dmaengine_cfg->dst_maxburst * diff --git
> a/include/linux/dma/imx-dma.h b/include/linux/dma/imx-dma.h index
> 8887762360d4..ef72e00fb55e 100644
> --- a/include/linux/dma/imx-dma.h
> +++ b/include/linux/dma/imx-dma.h
> @@ -40,6 +40,7 @@ enum sdma_peripheral_type {
>  	IMX_DMATYPE_ASRC_SP,	/* Shared ASRC */
>  	IMX_DMATYPE_SAI,	/* SAI */
>  	IMX_DMATYPE_MULTI_SAI,	/* MULTI FIFOs For Audio */
> +	IMX_DMATYPE_HDMI,       /* HDMI Audio */
>  };
> 
>  enum imx_dma_prio {
> --
> 2.25.1