Hi Laurent,
On Sun, Mar 08, 2015 at 11:37:55PM +0200, Laurent Pinchart wrote:
...
> @@ -198,24 +177,58 @@ static void hist_dma_cb(int lch, u16 ch_status, void
> *data)
> static int hist_buf_dma(struct ispstat *hist)
> {
> dma_addr_t dma_addr = hist->active_buf->dma_addr;
> + struct dma_async_tx_descriptor *tx;
> + struct dma_slave_config cfg;
> + dma_cookie_t cookie;
> + int ret;
>
> if (unlikely(!dma_addr)) {
> dev_dbg(hist->isp->dev, "hist: invalid DMA buffer address\n");
> - hist_reset_mem(hist);
> - return STAT_NO_BUF;
> + goto error;
> }
>
> isp_reg_writel(hist->isp, 0, OMAP3_ISP_IOMEM_HIST, ISPHIST_ADDR);
> isp_reg_set(hist->isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_CNT,
> ISPHIST_CNT_CLEAR);
> omap3isp_flush(hist->isp);
> - hist->dma_config.dst_start = dma_addr;
> - hist->dma_config.elem_count = hist->buf_size / sizeof(u32);
> - omap_set_dma_params(hist->dma_ch, &hist->dma_config);
>
> - omap_start_dma(hist->dma_ch);
> + memset(&cfg, 0, sizeof(cfg));
> + cfg.src_addr = hist->isp->mmio_base_phys[OMAP3_ISP_IOMEM_HIST]
> + + ISPHIST_DATA;
> + cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
> + cfg.src_maxburst = hist->buf_size / 4;
How about initialising the struct when you declare it instead? That might be
a matter of opinion though, but I think I prefer that. Up to you.
Acked-by: Sakari Ailus <sakari.ai...@iki.fi>
> + ret = dmaengine_slave_config(hist->dma_ch, &cfg);
> + if (ret < 0) {
> + dev_dbg(hist->isp->dev,
> + "hist: DMA slave configuration failed\n");
> + goto error;
> + }
> +
> + tx = dmaengine_prep_slave_single(hist->dma_ch, dma_addr,
> + hist->buf_size, DMA_DEV_TO_MEM,
> + DMA_CTRL_ACK);
> + if (tx == NULL) {
> + dev_dbg(hist->isp->dev,
> + "hist: DMA slave preparation failed\n");
> + goto error;
> + }
> +
> + tx->callback = hist_dma_cb;
> + tx->callback_param = hist;
> + cookie = tx->tx_submit(tx);
> + if (dma_submit_error(cookie)) {
> + dev_dbg(hist->isp->dev, "hist: DMA submission failed\n");
> + goto error;
> + }
> +
> + dma_async_issue_pending(hist->dma_ch);
>
> return STAT_BUF_WAITING_DMA;
> +
> +error:
> + hist_reset_mem(hist);
> + return STAT_NO_BUF;
> }
>
> static int hist_buf_pio(struct ispstat *hist)
--
Kind regards,
Sakari Ailus
e-mail: sakari.ai...@iki.fi XMPP: sai...@retiisi.org.uk
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