From: Thierry Reding <treding@xxxxxxxxxx>
Enhanced addressing mode is only required when more than 32 bits need to
be addressed. Add a DMA configuration parameter to enable this mode only
when needed.
Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
---
Changes in v4:
- enable EAME only if DMA addresses can be larger than 32 bits
drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c | 5 ++++-
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 7 +++++++
include/linux/stmmac.h | 1 +
3 files changed, 12 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c
index 965cbe3e6f51..7cc331996cd8 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c
@@ -27,7 +27,10 @@ static void dwxgmac2_dma_init(void __iomem *ioaddr,
if (dma_cfg->aal)
value |= XGMAC_AAL;
- writel(value | XGMAC_EAME, ioaddr + XGMAC_DMA_SYSBUS_MODE);
+ if (dma_cfg->eame)
+ value |= XGMAC_EAME;
+
+ writel(value, ioaddr + XGMAC_DMA_SYSBUS_MODE);
}
static void dwxgmac2_dma_init_chan(void __iomem *ioaddr,
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index c76a1336a451..b8ac1744950e 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -4515,6 +4515,13 @@ int stmmac_dvr_probe(struct device *device,
if (!ret) {
dev_info(priv->device, "Using %d bits DMA width\n",
priv->dma_cap.addr64);
+
+ /*
+ * If more than 32 bits can be addressed, make sure to
+ * enable enhanced addressing mode.
+ */
+ if (IS_ENABLED(CONFIG_ARCH_DMA_ADDR_T_64BIT))
+ priv->plat->dma_cfg->eame = true;
} else {
ret = dma_set_mask_and_coherent(device, DMA_BIT_MASK(32));
if (ret) {
diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
index dc60d03c4b60..86f9464c3f5d 100644
--- a/include/linux/stmmac.h
+++ b/include/linux/stmmac.h
@@ -92,6 +92,7 @@ struct stmmac_dma_cfg {
int fixed_burst;
int mixed_burst;
bool aal;
+ bool eame;
};
#define AXI_BLEN 7
--
2.23.0
