i3c: mipi-i3c-hci: Add DMA bounce buffer for private transfers

[linux-2.6-microblaze.git] / drivers / i3c / master / mipi-i3c-hci / dma.c

diff --git a/drivers/i3c/master/mipi-i3c-hci/dma.c b/drivers/i3c/master/mipi-i3c-hci/dma.c
index c805a84..4e01a95 100644 (file)
--- a/drivers/i3c/master/mipi-i3c-hci/dma.c
+++ b/drivers/i3c/master/mipi-i3c-hci/dma.c
@@ -362,6 +362,7 @@ static int hci_dma_queue_xfer(struct i3c_hci *hci,
        struct hci_rh_data *rh;
        unsigned int i, ring, enqueue_ptr;
        u32 op1_val, op2_val;
+       void *buf;
 
        /* For now we only use ring 0 */
        ring = 0;
@@ -390,9 +391,10 @@ static int hci_dma_queue_xfer(struct i3c_hci *hci,
 
                /* 2nd and 3rd words of Data Buffer Descriptor Structure */
                if (xfer->data) {
+                       buf = xfer->bounce_buf ? xfer->bounce_buf : xfer->data;
                        xfer->data_dma =
                                dma_map_single(&hci->master.dev,
-                                              xfer->data,
+                                              buf,
                                               xfer->data_len,
                                               xfer->rnw ?
                                                  DMA_FROM_DEVICE :