Messages in this thread | | | Date | Sat, 07 Mar 2015 09:21:36 +0100 | From | Lars-Peter Clausen <> | Subject | Re: [PATCH] ASoC: jz4740: Add jz4780 support |
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On 03/06/2015 04:33 PM, Zubair Lutfullah Kakakhel wrote: > The jz4780 and jz4740 have very similar i2s blocks. > > The slight difference is in Rx/Tx fifos. > And the bitclocks for input/output are different. > > This patch adds jz4780 support to the driver > > Signed-off-by: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com>
Looks mostly good. [...] > static inline uint32_t jz4740_i2s_read(const struct jz4740_i2s *i2s, > @@ -267,13 +283,22 @@ static int jz4740_i2s_hw_params(struct snd_pcm_substream *substream, > ctrl |= JZ_AIC_CTRL_MONO_TO_STEREO; > else > ctrl &= ~JZ_AIC_CTRL_MONO_TO_STEREO; > + > + div_reg &= ~I2SDIV_DV_MASK; > + div_reg |= (div - 1) << I2SDIV_DV_SHIFT; > } else { > ctrl &= ~JZ_AIC_CTRL_INPUT_SAMPLE_SIZE_MASK; > ctrl |= sample_size << JZ_AIC_CTRL_INPUT_SAMPLE_SIZE_OFFSET; > + > + if (i2s->version >= JZ_I2S_JZ4780) { > + div_reg &= ~I2SDIV_IDV_MASK; > + div_reg |= (div - 1) << I2SDIV_IDV_SHIFT; > + } else { > + div_reg &= ~I2SDIV_DV_MASK; > + div_reg |= (div - 1) << I2SDIV_DV_SHIFT; > + } > }
Given that the JZ4780 supports different rates for TX and RX in this configuration you can also remove the symmetric_rates flag from the DAI struct, so applications can actually make use of it.
> > - div_reg &= ~I2SDIV_DV_MASK; > - div_reg |= (div - 1) << I2SDIV_DV_SHIFT; > jz4740_i2s_write(i2s, JZ_REG_AIC_CTRL, ctrl); > jz4740_i2s_write(i2s, JZ_REG_AIC_CLK_DIV, div_reg); > [...] > + if (i2s->version >= JZ_I2S_JZ4780) > + return devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, > + SND_DMAENGINE_PCM_FLAG_NO_RESIDUE);
We should not be adding new users of SND_DMAENGINE_PCM_FLAG_NO_RESIDUE, this is a property of the DMA controller/driver and the DMAengine framework now has the capabilities to report on whether it supports residue reporting or not.
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