On Wed, Sep 10, 2014 at 09:18:52PM -0500, Andy Gross wrote:
> +static int adm_slave_config(struct adm_chan *achan,
> + struct dma_slave_config *cfg)
> +{
> + int ret = 0;
> + u32 burst;
> + struct adm_device *adev = achan->adev;
> +
> + memcpy(&achan->slave, cfg, sizeof(*cfg));
> +
> + /* set channel CRCI burst, if applicable */
> + if (achan->crci) {
> + burst = max_t(u32, cfg->src_maxburst, cfg->dst_maxburst);
> +
> + switch (burst) {
> + case 16:
> + achan->blk_size = 0;
> + break;
> + case 32:
> + achan->blk_size = 1;
> + break;
> + case 64:
> + achan->blk_size = 2;
> + break;
> + case 128:
> + achan->blk_size = 3;
> + break;
> + case 192:
> + achan->blk_size = 4;
> + break;
> + case 256:
> + achan->blk_size = 5;
> + break;
> + default:
> + achan->slave.src_maxburst = 0;
> + achan->slave.dst_maxburst = 0;
Why clear these for error cases
> + ret = -EINVAL;
> + break;
> + }
> +
> + if (!ret)
> + writel(achan->blk_size,
> + adev->regs + HI_CRCI_CTL(achan->id, adev->ee));
and why do we write to HW on this. Shouldn't this be done when you program
the descriptor?
> +static enum dma_status adm_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
> + struct dma_tx_state *txstate)
> +{
> + struct adm_chan *achan = to_adm_chan(chan);
> + struct virt_dma_desc *vd;
> + enum dma_status ret;
> + unsigned long flags;
> + size_t residue = 0;
> +
> + ret = dma_cookie_status(chan, cookie, txstate);
> +
Last arg can be null to this, so before you do residue calcluation and block
interrupts would make sense to return from here if arg is NULL
> + spin_lock_irqsave(&achan->vc.lock, flags);
> +
> + vd = vchan_find_desc(&achan->vc, cookie);
> + if (vd)
> + residue = container_of(vd, struct adm_async_desc, vd)->length;
> + else if (achan->curr_txd && achan->curr_txd->vd.tx.cookie == cookie)
> + residue = achan->curr_txd->length;
so this is current cookie, so you need to read from HW on current position
> +
> + spin_unlock_irqrestore(&achan->vc.lock, flags);
> +
> + dma_set_residue(txstate, residue);
> +
> + if (achan->error)
> + return DMA_ERROR;
> +
> + return ret;
--
~Vinod
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