dmaengine: mv_xor_v2: add support for suspend/resume

This commit adds the support for suspend/resume in the mv_xor_v2
driver. The suspend suspend function disables the XOR engine after the
DMA stack has handled all pending descriptors in the queue. The resume
function re-configures the XOR engine and re-enables the engine.

Signed-off-by: Hanna Hawa <hannah@marvell.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

diff --git a/drivers/dma/mv_xor_v2.c b/drivers/dma/mv_xor_v2.c
index f386b88bb50c9569e493d65719e8d056b3c0e925..f652a0e0f5a2a46d78bece1d41cd0895dfc5d593 100644 (file)
--- a/drivers/dma/mv_xor_v2.c
+++ b/drivers/dma/mv_xor_v2.c
@@ -696,6 +696,27 @@ static int mv_xor_v2_descq_init(struct mv_xor_v2_device *xor_dev)
        return 0;
 }
 
+static int mv_xor_v2_suspend(struct platform_device *dev, pm_message_t state)
+{
+       struct mv_xor_v2_device *xor_dev = platform_get_drvdata(dev);
+
+       /* Set this bit to disable to stop the XOR unit. */
+       writel(0x1, xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_STOP_OFF);
+
+       return 0;
+}
+
+static int mv_xor_v2_resume(struct platform_device *dev)
+{
+       struct mv_xor_v2_device *xor_dev = platform_get_drvdata(dev);
+
+       mv_xor_v2_set_desc_size(xor_dev);
+       mv_xor_v2_enable_imsg_thrd(xor_dev);
+       mv_xor_v2_descq_init(xor_dev);
+
+       return 0;
+}
+
 static int mv_xor_v2_probe(struct platform_device *pdev)
 {
        struct mv_xor_v2_device *xor_dev;
@@ -877,6 +898,8 @@ MODULE_DEVICE_TABLE(of, mv_xor_v2_dt_ids);
 
 static struct platform_driver mv_xor_v2_driver = {
        .probe          = mv_xor_v2_probe,
+       .suspend        = mv_xor_v2_suspend,
+       .resume         = mv_xor_v2_resume,
        .remove         = mv_xor_v2_remove,
        .driver         = {
                .name   = "mv_xor_v2",