[PATCH v3] net: qcom/emac: extend DMA mask to 46bits

[Wang Dongsheng]

Since PTP doesn't support yet, so extend the DMA address to 46bits.

Signed-off-by: Wang Dongsheng <wdsc...@gmail.com>
---
v3:
- Remove "Dynamic fix TPD_BUFFER_ADDR_H_SET size."
- Add comments for TPD_BUFFER_ADDR_H_SET.
v2:
- Changes PATCH subject.
- Dynamic fix TPD_BUFFER_ADDR_H_SET size.
- Modify DMA MASK to 46bits.
- Add Comments for DMA MASK.
---
 drivers/net/ethernet/qualcomm/emac/emac-mac.h | 3 ++-
 drivers/net/ethernet/qualcomm/emac/emac.c     | 7 +++++--
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/qualcomm/emac/emac-mac.h 
b/drivers/net/ethernet/qualcomm/emac/emac-mac.h
index 5028fb4..4beedb8 100644
--- a/drivers/net/ethernet/qualcomm/emac/emac-mac.h
+++ b/drivers/net/ethernet/qualcomm/emac/emac-mac.h
@@ -114,8 +114,9 @@ struct emac_tpd {
 #define TPD_INSTC_SET(tpd, val)                BITS_SET((tpd)->word[3], 17, 
17, val)
 /* High-14bit Buffer Address, So, the 64b-bit address is
  * {DESC_CTRL_11_TX_DATA_HIADDR[17:0],(register) BUFFER_ADDR_H, BUFFER_ADDR_L}
+ * Extend TPD_BUFFER_ADDR_H to [31, 18], because we never enable timestamping.
  */
-#define TPD_BUFFER_ADDR_H_SET(tpd, val)        BITS_SET((tpd)->word[3], 18, 
30, val)
+#define TPD_BUFFER_ADDR_H_SET(tpd, val)        BITS_SET((tpd)->word[3], 18, 
31, val)
 /* Format D. Word offset from the 1st byte of this packet to start to calculate
  * the custom checksum.
  */
diff --git a/drivers/net/ethernet/qualcomm/emac/emac.c 
b/drivers/net/ethernet/qualcomm/emac/emac.c
index 70c92b6..a4b39d1 100644
--- a/drivers/net/ethernet/qualcomm/emac/emac.c
+++ b/drivers/net/ethernet/qualcomm/emac/emac.c
@@ -615,8 +615,11 @@ static int emac_probe(struct platform_device *pdev)
        u32 reg;
        int ret;
 
-       /* The TPD buffer address is limited to 45 bits. */
-       ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(45));
+       /* The TPD buffer address is limited to:
+        * 1. PTP:      45bits. (Driver doesn't support yet.)
+        * 2. NON-PTP:  46bits.
+        */
+       ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(46));
        if (ret) {
                dev_err(&pdev->dev, "could not set DMA mask\n");
                return ret;
-- 
2.7.4