From: Biju Das <biju.das.jz@...>

commit 68ca3c923213b908c14a673f6c3ec808664fae1f upstream.

R-Car Gen2 needs a 4byte aligned address for the transmission buffer,
whereas R-Car Gen3 doesn't have any such restriction.

Add aligned_tx to struct ravb_hw_info to select the driver to choose
between aligned and unaligned tx buffers.

Signed-off-by: Biju Das <biju.das.jz@...>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...>
Signed-off-by: David S. Miller <davem@...>
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...>
---
drivers/net/ethernet/renesas/ravb.h | 1 +
drivers/net/ethernet/renesas/ravb_main.c | 3 ++-
2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/renesas/ravb.h b/drivers/net/ethernet/renesas/ravb.h
index 9c228fa8e2a4..830a3e4a9606 100644
--- a/drivers/net/ethernet/renesas/ravb.h
+++ b/drivers/net/ethernet/renesas/ravb.h
@@ -991,6 +991,7 @@ enum ravb_chip_id {

struct ravb_hw_info {
enum ravb_chip_id chip_id;
+ unsigned aligned_tx: 1;
};

struct ravb_private {
diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index 0bf787896521..60acb53eaa81 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -1928,6 +1928,7 @@ static const struct ravb_hw_info ravb_gen3_hw_info = {

static const struct ravb_hw_info ravb_gen2_hw_info = {
.chip_id = RCAR_GEN2,
+ .aligned_tx = 1,
};

static const struct of_device_id ravb_match_table[] = {
@@ -2138,7 +2139,7 @@ static int ravb_probe(struct platform_device *pdev)
ndev->max_mtu = 2048 - (ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN);
ndev->min_mtu = ETH_MIN_MTU;

- priv->num_tx_desc = info->chip_id == RCAR_GEN2 ?
+ priv->num_tx_desc = info->aligned_tx ?
NUM_TX_DESC_GEN2 : NUM_TX_DESC_GEN3;

/* Set function */
--
2.17.1