[PATCH net-next] net: stmmac: dwmac4: Report DCB feature capability

[Ovidiu Panait]

Bit 16 of the MAC HW Feature1 register reports the DCB (Data Centre
Bridging) feature. Read it so that dma_cap.dcben and the debugfs
report it accurately. Right now it is always reported as being disabled.

Signed-off-by: Ovidiu Panait <ovidiu.panait.rb at renesas.com>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac4.h     | 1 +
 drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c | 1 +
 2 files changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4.h b/drivers/net/ethernet/stmicro/stmmac/dwmac4.h
index ffcd036d4c02..6382836828ba 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4.h
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4.h
@@ -198,6 +198,7 @@ enum power_event {
 #define GMAC_HW_FEAT_AVSEL		BIT(20)
 #define GMAC_HW_TSOEN			BIT(18)
 #define GMAC_HW_FEAT_SPHEN		BIT(17)
+#define GMAC_HW_FEAT_DCBEN		BIT(16)
 #define GMAC_HW_ADDR64			GENMASK(15, 14)
 #define GMAC_HW_TXFIFOSIZE		GENMASK(10, 6)
 #define GMAC_HW_RXFIFOSIZE		GENMASK(4, 0)
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c
index 28728271fbc9..829a23bdad01 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c
@@ -391,6 +391,7 @@ static int dwmac4_get_hw_feature(void __iomem *ioaddr,
 	dma_cap->av = (hw_cap & GMAC_HW_FEAT_AVSEL) >> 20;
 	dma_cap->tsoen = (hw_cap & GMAC_HW_TSOEN) >> 18;
 	dma_cap->sphen = (hw_cap & GMAC_HW_FEAT_SPHEN) >> 17;
+	dma_cap->dcben = (hw_cap & GMAC_HW_FEAT_DCBEN) >> 16;
 
 	dma_cap->addr64 = (hw_cap & GMAC_HW_ADDR64) >> 14;
 	switch (dma_cap->addr64) {
-- 
2.34.1