From a9ed3f37063f18bd3434924e4c45f21a67d04d5c Mon Sep 17 00:00:00 2001
From: Stefan Agner <stefan@agner.ch>
Date: Thu, 2 Aug 2018 10:42:50 +0200
Subject: [PATCH 03/16] net: fec: check DMA addressing limitations
Git-commit: 453e9dc48be466afa2adc25d072aa4c5b8774f8d
Patch-mainline: v4.19-rc1
References: git-fixes
Check DMA addressing limitations as suggested by the DMA API
how-to. This does not fix a particular issue seen but is
considered good style.
Signed-off-by: Stefan Agner <stefan@agner.ch>
Acked-by: Fugang Duan <fugang.duan@nxp.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Denis Kirjanov <denis.kirjanov@suse.com>
---
drivers/net/ethernet/freescale/fec_main.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index b0bea7cb2f20..70a5039faa89 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -3157,6 +3157,7 @@ static int fec_enet_init(struct net_device *ndev)
unsigned dsize = fep->bufdesc_ex ? sizeof(struct bufdesc_ex) :
sizeof(struct bufdesc);
unsigned dsize_log2 = __fls(dsize);
+ int ret;
WARN_ON(dsize != (1 << dsize_log2));
#if defined(CONFIG_ARM) || defined(CONFIG_ARM64)
@@ -3167,6 +3168,13 @@ static int fec_enet_init(struct net_device *ndev)
fep->tx_align = 0x3;
#endif
+ /* Check mask of the streaming and coherent API */
+ ret = dma_set_mask_and_coherent(&fep->pdev->dev, DMA_BIT_MASK(32));
+ if (ret < 0) {
+ dev_warn(&fep->pdev->dev, "No suitable DMA available\n");
+ return ret;
+ }
+
fec_enet_alloc_queue(ndev);
bd_size = (fep->total_tx_ring_size + fep->total_rx_ring_size) * dsize;
--
2.16.4