From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lee Jones Subject: Re: [alsa-devel] [PATCH 1/3] ASoC: ux500_pcm: Stop pretending that we support varying address widths Date: Tue, 3 Dec 2013 08:31:16 +0000 Message-ID: <20131203083116.GA11828@lee--X1> References: <1386007222-10081-1-git-send-email-lee.jones@linaro.org> <529CD2B5.9060905@metafoo.de> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Content-Disposition: inline In-Reply-To: <529CD2B5.9060905@metafoo.de> Sender: linux-kernel-owner@vger.kernel.org To: Lars-Peter Clausen Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linus.walleij@linaro.org, broonie@kernel.org, alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org On Mon, 02 Dec 2013, Lars-Peter Clausen wrote: > On 12/02/2013 07:00 PM, Lee Jones wrote: > > The Slave Config's addr_width attribute is populated by data_width = of > > dma_cfg, which in turn is derived from dma_params' data_size attrib= ute > > and that comes from the slot_width which is always 16 bits (2 Bytes= ). > > We're cutting out the middle man here and just setting the DMA Slav= e > > Config directly. > >=20 > > Cc: alsa-devel@alsa-project.org > > Signed-off-by: Lee Jones >=20 > Patch looks good. But as a follow up patch I think you can now switch= to the > generic snd_dmaengine_pcm_prepare_slave_config. No, I don't think we can. Your version only populates the DMA settings for the correct stream (Playback OR Capture), but our DMA Controller requires both source and destination to be setup. > > --- > > sound/soc/ux500/ux500_pcm.c | 13 ++++++------- > > 1 file changed, 6 insertions(+), 7 deletions(-) > >=20 > > diff --git a/sound/soc/ux500/ux500_pcm.c b/sound/soc/ux500/ux500_pc= m.c > > index 6162f70..2f1bdb7 100644 > > --- a/sound/soc/ux500/ux500_pcm.c > > +++ b/sound/soc/ux500/ux500_pcm.c > > @@ -104,26 +104,25 @@ static int ux500_pcm_prepare_slave_config(str= uct snd_pcm_substream *substream, > > struct dma_slave_config *slave_config) > > { > > struct snd_soc_pcm_runtime *rtd =3D substream->private_data; > > - struct ux500_msp_dma_params *dma_params; > > - struct stedma40_chan_cfg *dma_cfg; > > + struct snd_dmaengine_dai_dma_data *dma_params; > > int ret; > > =20 > > dma_params =3D snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); > > - dma_cfg =3D dma_params->dma_cfg; > > =20 > > ret =3D snd_hwparams_to_dma_slave_config(substream, params, slave= _config); > > if (ret) > > return ret; > > =20 > > slave_config->dst_maxburst =3D 4; > > - slave_config->dst_addr_width =3D dma_cfg->dst_info.data_width; > > slave_config->src_maxburst =3D 4; > > - slave_config->src_addr_width =3D dma_cfg->src_info.data_width; > > + > > + slave_config->src_addr_width =3D DMA_SLAVE_BUSWIDTH_2_BYTES; > > + slave_config->dst_addr_width =3D DMA_SLAVE_BUSWIDTH_2_BYTES; > > =20 > > if (substream->stream =3D=3D SNDRV_PCM_STREAM_PLAYBACK) > > - slave_config->dst_addr =3D dma_params->tx_rx_addr; > > + slave_config->dst_addr =3D dma_params->addr; > > else > > - slave_config->src_addr =3D dma_params->tx_rx_addr; > > + slave_config->src_addr =3D dma_params->addr; > > =20 > > return 0; > > } > >=20 >=20 --=20 Lee Jones Linaro STMicroelectronics Landing Team Lead Linaro.org =E2=94=82 Open source software for ARM SoCs =46ollow Linaro: Facebook | Twitter | Blog