linux-kernel - [PATCH 5.7 179/477] PCI: brcmstb: Assert fundamental reset on initialization

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Message-Id: <20200623195416.044902331@linuxfoundation.org>
Date:   Tue, 23 Jun 2020 21:52:56 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.7 179/477] PCI: brcmstb: Assert fundamental reset on initialization

From: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>

[ Upstream commit 22e21e51ce755399fd42055a3f668ee4af370881 ]

While preparing the driver for upstream this detail was missed.

If not asserted during the initialization process, devices connected on
the bus will not be made aware of the internal reset happening. This,
potentially resulting in unexpected behavior.

Link: https://lore.kernel.org/r/20200507172020.18000-1-nsaenzjulienne@suse.de
Fixes: c0452137034b ("PCI: brcmstb: Add Broadcom STB PCIe host controller driver")
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Acked-by: Florian Fainelli <f.fainelli@...il.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/pci/controller/pcie-brcmstb.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
index c9ecc4d639c19..2297910bf6e47 100644
--- a/drivers/pci/controller/pcie-brcmstb.c
+++ b/drivers/pci/controller/pcie-brcmstb.c
@@ -697,6 +697,7 @@ static int brcm_pcie_setup(struct brcm_pcie *pcie)
 
 	/* Reset the bridge */
 	brcm_pcie_bridge_sw_init_set(pcie, 1);
+	brcm_pcie_perst_set(pcie, 1);
 
 	usleep_range(100, 200);
 
-- 
2.25.1