linux-kernel - [PATCH] PCI: brcmstb: Assert fundamental reset on initialization

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Message-Id: <20200507172020.18000-1-nsaenzjulienne@suse.de>
Date:   Thu,  7 May 2020 19:20:20 +0200
From:   Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
To:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Jeremy Linton <jeremy.linton@....com>,
        Andrew Murray <amurray@...goodpenguin.co.uk>,
        Jim Quinlan <james.quinlan@...adcom.com>
Cc:     s.nawrocki@...sung.com, tim.gover@...pberrypi.com,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] PCI: brcmstb: Assert fundamental reset on initialization

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.

Fixes: c0452137034b ("PCI: brcmstb: Add Broadcom STB PCIe host controller driver")
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
---
 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 0b97b94c4a9a..795a03be4150 100644
--- a/drivers/pci/controller/pcie-brcmstb.c
+++ b/drivers/pci/controller/pcie-brcmstb.c
@@ -699,6 +699,7 @@ 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);
 
-- 
2.26.2