linux-kernel - [PATCH AUTOSEL 4.19 069/101] PCI: mobiveil: Initialize Primary/Secondary/Subordinate bus numbers

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Date:   Fri, 19 Jul 2019 00:07:00 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Hou Zhiqiang <Zhiqiang.Hou@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Minghuan Lian <Minghuan.Lian@....com>,
        Subrahmanya Lingappa <l.subrahmanya@...iveil.co.in>,
        Sasha Levin <sashal@...nel.org>, linux-pci@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 069/101] PCI: mobiveil: Initialize Primary/Secondary/Subordinate bus numbers

From: Hou Zhiqiang <Zhiqiang.Hou@....com>

[ Upstream commit 6f3ab451aa5c2cbff33197d82fe8489cbd55ad91 ]

The reset value of Primary, Secondary and Subordinate bus numbers is
zero which is a broken setup.

Program a sensible default value for Primary/Secondary/Subordinate
bus numbers.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@....com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Reviewed-by: Minghuan Lian <Minghuan.Lian@....com>
Reviewed-by: Subrahmanya Lingappa <l.subrahmanya@...iveil.co.in>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/pci/controller/pcie-mobiveil.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/pci/controller/pcie-mobiveil.c b/drivers/pci/controller/pcie-mobiveil.c
index 3e81e68b5ce0..2fe7ebdad2d2 100644
--- a/drivers/pci/controller/pcie-mobiveil.c
+++ b/drivers/pci/controller/pcie-mobiveil.c
@@ -508,6 +508,12 @@ static int mobiveil_host_init(struct mobiveil_pcie *pcie)
 		return err;
 	}
 
+	/* setup bus numbers */
+	value = csr_readl(pcie, PCI_PRIMARY_BUS);
+	value &= 0xff000000;
+	value |= 0x00ff0100;
+	csr_writel(pcie, value, PCI_PRIMARY_BUS);
+
 	/*
 	 * program Bus Master Enable Bit in Command Register in PAB Config
 	 * Space
-- 
2.20.1