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dmaengine: qcom_hidma: pause the channel on shutdown

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We need to ensure that all DMAs and interrupts are cleared during
shutdown operation in order for kexec to start the next kernel clearly.

Otherwise, HW could be performing a DMA into random addresses in the
middle of second kernel start.

Signed-off-by: Sinan Kaya <[email protected]>
Signed-off-by: Vinod Koul <[email protected]>
This commit is contained in:
Sinan Kaya 2017-03-25 19:04:03 -04:00 • committed by Vinod Koul
commit dc7c733acb
1 changed files with 15 additions and 0 deletions
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15
drivers/dma/qcom/hidma.c
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@ -865,6 +865,20 @@ bailout:
return rc;
}
static void hidma_shutdown(struct platform_device *pdev)
{
struct hidma_dev *dmadev = platform_get_drvdata(pdev);
dev_info(dmadev->ddev.dev, "HI-DMA engine shutdown\n");
pm_runtime_get_sync(dmadev->ddev.dev);
if (hidma_ll_disable(dmadev->lldev))
dev_warn(dmadev->ddev.dev, "channel did not stop\n");
pm_runtime_mark_last_busy(dmadev->ddev.dev);
pm_runtime_put_autosuspend(dmadev->ddev.dev);
}
static int hidma_remove(struct platform_device *pdev)
{
struct hidma_dev *dmadev = platform_get_drvdata(pdev);
@ -908,6 +922,7 @@ MODULE_DEVICE_TABLE(of, hidma_match);
static struct platform_driver hidma_driver = {
.probe = hidma_probe,
.remove = hidma_remove,
.shutdown = hidma_shutdown,
.driver = {
.name = "hidma",
.of_match_table = hidma_match,