/*
* We are posting descriptors to the hardware as soon as
* they are ready, so this function does nothing.
*/
So, the Freescale driver was written before change went effective. I
guess in 2011 DMA Engine drivers should use issue pending.
Please, refactor since this behaviour is expected.
done
+/*
+ * Submit descriptor to hardware.
+ * Lock the PM for each descriptor we are sending.
+ */
+static dma_cookie_t hidma_tx_submit(struct dma_async_tx_descriptor *txd)
+{
+ struct hidma_chan *mchan = to_hidma_chan(txd->chan);
+ struct hidma_dev *dmadev = mchan->dmadev;
+ struct hidma_desc *mdesc;
+ unsigned long irqflags;
+ dma_cookie_t cookie;
+
+ if (!hidma_ll_isenabled(dmadev->lldev))
+ return -ENODEV;
+
+ pm_runtime_get_sync(dmadev->ddev.dev);
No point to do it here. It should be done on the function that
actually starts the transfer (see issue pending).
comment above
See above as well.
done
+static int hidma_probe(struct platform_device *pdev)
+{
+ struct hidma_dev *dmadev;
+ int rc = 0;
+ struct resource *trca_resource;
+ struct resource *evca_resource;
+ int chirq;
+ int current_channel_index = atomic_read(&channel_ref_count);
+
+ /* Set DMA mask to 64 bits. */
+ rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
+ if (rc) {
+ dev_warn(&pdev->dev, "unable to set coherent mask to
64");
+ rc = dma_set_mask_and_coherent(&pdev->dev,
DMA_BIT_MASK(32));
+ }
+ if (rc)
+ goto dmafree;
Maybe move these two lines inside previous condition?
ok
+
+ dmadev->lldev = hidma_ll_init(dmadev->ddev.dev,
+ dmadev->nr_descriptors, dmadev->dev_trca,
+ dmadev->dev_evca, dmadev->evridx);
+ if (!dmadev->lldev) {
+ rc = -EPROBE_DEFER;
+ goto dmafree;
+ }
+
+ rc = devm_request_irq(&pdev->dev, chirq, hidma_chirq_handler, 0,
+ "qcom-hidma", &dmadev->lldev);
Better to use request_irq().
why? I thought we favored managed functions over standalone functions in
simplify the exit path.
IRQ is slightly different in workflow. In most cases, unfortunately,
there is no achievement by devm_ variant.
At least I know two for now. One of them is DMA Engine slave drivers,
though I didn't notice if you are using tasklet's here.
Otherwise it's okay.
I'm keeping it as it is for maintenance reasons.
--
Sinan Kaya
Qualcomm Technologies, Inc. on behalf of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a
Linux Foundation Collaborative Project
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