On Thu, Sep 01, 2016 at 03:43:16PM -0700, Nicolin Chen wrote:
> +#define ADMA_CH_CTRL_MODE_ONCE (1 << 8)
BIT(8)? You should change the existing ones too :)
> #define ADMA_CH_CTRL_MODE_CONTINUOUS (2 << 8)
> +#define ADMA_CH_CTRL_MODE_LINKED_LIST (4 << 8)
> #define ADMA_CH_CTRL_FLOWCTRL_EN BIT(1)
>
> #define ADMA_CH_CONFIG 0x28
> @@ -111,6 +115,7 @@ struct tegra_adma_desc {
> size_t buf_len;
> size_t period_len;
> size_t num_periods;
> + bool cyclic;
Okay, i think this should be a separate preparatory patch
> case DMA_DEV_TO_MEM:
> adma_dir = ADMA_CH_CTRL_DIR_AHUB2MEM;
> burst_size = fls(tdc->sconfig.src_maxburst);
> - ch_regs->config = ADMA_CH_CONFIG_TRG_BUF(desc->num_periods - 1);
> - ch_regs->ctrl = ADMA_CH_CTRL_RX_REQ(tdc->sreq_index);
> + ch_regs->config = ADMA_CH_CONFIG_TRG_BUF(num_periods - 1);
> + ch_regs->ctrl = ADMA_CH_CTRL_RX_REQ(tdc->sreq_index) |
> + ADMA_CH_CTRL_MODE_CONTINUOUS |
> + ADMA_CH_CTRL_FLOWCTRL_EN;
why is this changing?
> +static struct dma_async_tx_descriptor *tegra_adma_prep_dma_memcpy(
> + struct dma_chan *dc, dma_addr_t dest, dma_addr_t src,
> + size_t buf_len, unsigned long flags)
> +{
> + struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
> + struct device *dev = dc->device->dev;
> + struct tegra_adma_desc *desc = NULL;
> +
> + dev_dbg(dev, "%s channel: %d src=0x%llx dst=0x%llx len=%zu\n",
> + __func__, dc->chan_id, (unsigned long long)src,
> + (unsigned long long)dest, buf_len);
> +
> + if (unlikely(!tdc || !buf_len))
> + return NULL;
> +
> + desc = kzalloc(sizeof(*desc), GFP_NOWAIT);
> + if (!desc)
> + return NULL;
> +
> + desc->num_periods = 1;
> + desc->buf_len = buf_len;
> + desc->period_len = buf_len;
should we perhaps rename this to length rather than period?
--
~Vinod
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