linux-kernel - [PATCH 1/5] net: cadence: macb: Set upper 32bits of DMA ring buffer

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Message-ID: <20250815135911.1383385-2-svarbanov@suse.de>
Date: Fri, 15 Aug 2025 16:59:07 +0300
From: Stanimir Varbanov <svarbanov@...e.de>
To: netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rpi-kernel@...ts.infradead.org,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>
Cc: Andrew Lunn <andrew+netdev@...n.ch>,
	"David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Andrea della Porta <andrea.porta@...e.com>,
	Nicolas Ferre <nicolas.ferre@...rochip.com>,
	Claudiu Beznea <claudiu.beznea@...on.dev>,
	Phil Elwell <phil@...pberrypi.com>,
	Jonathan Bell <jonathan@...pberrypi.com>,
	Dave Stevenson <dave.stevenson@...pberrypi.com>,
	Stanimir Varbanov <svarbanov@...e.de>
Subject: [PATCH 1/5] net: cadence: macb: Set upper 32bits of DMA ring buffer

In case of rx queue reset and 64bit capable hardware, set the upper
32bits of DMA ring buffer address.

Signed-off-by: Stanimir Varbanov <svarbanov@...e.de>
---
 drivers/net/ethernet/cadence/macb_main.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index ce95fad8cedd..41c0cbb5262e 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -1635,6 +1635,11 @@ static int macb_rx(struct macb_queue *queue, struct napi_struct *napi,
 
 		macb_init_rx_ring(queue);
 		queue_writel(queue, RBQP, queue->rx_ring_dma);
+#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
+		if (bp->hw_dma_cap & HW_DMA_CAP_64B)
+			macb_writel(bp, RBQPH,
+				    upper_32_bits(queue->rx_ring_dma));
+#endif
 
 		macb_writel(bp, NCR, ctrl | MACB_BIT(RE));
 
-- 
2.47.0