RE: [EXT] Re: [PATCH v6 2/4] dmaengine: imx-sdma: support hdmi audio

[Joy Zou]

> -----Original Message-----
> From: Vinod Koul <vkoul@xxxxxxxxxx>
> Sent: 2022年10月19日 22:25
> To: Joy Zou <joy.zou@xxxxxxx>
> Cc: robh+dt@xxxxxxxxxx; krzysztof.kozlowski+dt@xxxxxxxxxx;
> shawnguo@xxxxxxxxxx; s.hauer@xxxxxxxxxxxxxx; kernel@xxxxxxxxxxxxxx;
> festevam@xxxxxxxxx; S.J. Wang <shengjiu.wang@xxxxxxx>;
> martink@xxxxxxxxx; dev@xxxxxxxxxx; alexander.stein@xxxxxxxxxxxxxxx;
> Peng Fan <peng.fan@xxxxxxx>; david@xxxxxxx; aford173@xxxxxxxxx;
> Hongxing Zhu <hongxing.zhu@xxxxxxx>; dl-linux-imx <linux-imx@xxxxxxx>;
> dmaengine@xxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx;
> linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx
> Subject: [EXT] Re: [PATCH v6 2/4] dmaengine: imx-sdma: support hdmi audio
> 
> Caution: EXT Email
> 
> On 06-09-22, 17:42, Joy Zou wrote:
> > Add hdmi audio support in sdma.
> 
> Pls add description in changelog about what it takes to enabled hdmi (cyclic
> support etc)
Thank you very much for your comments.
I have changed commit message in patch v7.
BR
Joy Zou
> 
> >
> > Signed-off-by: Joy Zou <joy.zou@xxxxxxx>
> > ---
> >  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
> > fbea5f62dd98..ab877ceeac3f 100644
> > --- a/drivers/dma/imx-sdma.c
> > +++ b/drivers/dma/imx-sdma.c
> > @@ -954,7 +954,10 @@ 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);
> @@
> > -1074,6 +1077,10 @@ 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); @@ -1125,11 +1132,16 @@
> 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; @@ -1513,7
> > +1525,7 @@ 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 */ @@
> > -1678,13 +1690,16 @@ 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); @@
> > -1701,6 +1716,9 @@ 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;
> > @@ -1761,6 +1779,10 @@ 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 f487a4fa103a..cfec5f946e23 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 {
> > --
> > 2.37.1
> 
> --
> ~Vinod