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 <okaya@xxxxxxxxxxxxxx>
---
drivers/dma/qcom/hidma.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/drivers/dma/qcom/hidma.c b/drivers/dma/qcom/hidma.c
index 3c982c9..5072a7d 100644
--- a/drivers/dma/qcom/hidma.c
+++ b/drivers/dma/qcom/hidma.c
@@ -865,6 +865,20 @@ static int hidma_probe(struct platform_device *pdev)
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 @@ static int hidma_remove(struct platform_device *pdev)
static struct platform_driver hidma_driver = {
.probe = hidma_probe,
.remove = hidma_remove,
+ .shutdown = hidma_shutdown,
.driver = {
.name = "hidma",
.of_match_table = hidma_match,
--
1.9.1
--
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