Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.15 070/262] PCI: mvebu: Setup PCIe controller to Root Complex mode
Date:   Mon,  7 Mar 2022 10:16:54 +0100
Message-Id: <20220307091704.475773855@linuxfoundation.org>
In-Reply-To: <20220307091702.378509770@linuxfoundation.org>
References: <20220307091702.378509770@linuxfoundation.org>
User-Agent: quilt/0.66
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Precedence: bulk

From: Pali Rohár <pali@kernel.org>

[ Upstream commit df08ac016124bd88b8598ac0599d7b89c0642774 ]

This driver operates only in Root Complex mode, so ensure that hardware is
properly configured in Root Complex mode.

Link: https://lore.kernel.org/r/20211125124605.25915-10-pali@kernel.org
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/pci/controller/pci-mvebu.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/controller/pci-mvebu.c b/drivers/pci/controller/pci-mvebu.c
index 76f35d0773b79..e2d4bd8442a80 100644
--- a/drivers/pci/controller/pci-mvebu.c
+++ b/drivers/pci/controller/pci-mvebu.c
@@ -55,6 +55,7 @@
 #define  PCIE_MASK_ENABLE_INTS          0x0f000000
 #define PCIE_CTRL_OFF		0x1a00
 #define  PCIE_CTRL_X1_MODE		0x0001
+#define  PCIE_CTRL_RC_MODE		BIT(1)
 #define PCIE_STAT_OFF		0x1a04
 #define  PCIE_STAT_BUS                  0xff00
 #define  PCIE_STAT_DEV                  0x1f0000
@@ -218,7 +219,12 @@ static void mvebu_pcie_setup_wins(struct mvebu_pcie_port *port)
 
 static void mvebu_pcie_setup_hw(struct mvebu_pcie_port *port)
 {
-	u32 cmd, mask;
+	u32 ctrl, cmd, mask;
+
+	/* Setup PCIe controller to Root Complex mode. */
+	ctrl = mvebu_readl(port, PCIE_CTRL_OFF);
+	ctrl |= PCIE_CTRL_RC_MODE;
+	mvebu_writel(port, ctrl, PCIE_CTRL_OFF);
 
 	/* Disable Root Bridge I/O space, memory space and bus mastering. */
 	cmd = mvebu_readl(port, PCIE_CMD_OFF);
-- 
2.34.1