From 85f3fddbcc2e8282f1c26dcef4684f59490d47ba Mon Sep 17 00:00:00 2001
From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Date: Thu, 14 Jan 2021 16:49:01 +0100
Subject: [PATCH] pci: brcmstb: Cleanup controller state before handover
Make sure we handover the PCIe controller in a clean state. Some of the
devices hanging from the PCIe bus might need to be properly reset
through #PERST in order for Linux to be able to initialize them.
This is specially important in order to properly initialize Raspberry Pi
4 B and 400's USB chip.
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Signed-off-by: Matthias Brugger <mbrugger@suse.com>
---
drivers/pci/pcie_brcmstb.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/drivers/pci/pcie_brcmstb.c b/drivers/pci/pcie_brcmstb.c
index dd2a4ef629..54aa02c809 100644
--- a/drivers/pci/pcie_brcmstb.c
+++ b/drivers/pci/pcie_brcmstb.c
@@ -579,6 +579,24 @@ static int brcm_pcie_probe(struct udevice *dev)
return 0;
}
+static int brcm_pcie_remove(struct udevice *dev)
+{
+ struct brcm_pcie *pcie = dev_get_priv(dev);
+ void __iomem *base = pcie->base;
+
+ /* Assert fundamental reset */
+ setbits_le32(base + PCIE_RGR1_SW_INIT_1, RGR1_SW_INIT_1_PERST_MASK);
+
+ /* Turn off SerDes */
+ setbits_le32(base + PCIE_MISC_HARD_PCIE_HARD_DEBUG,
+ PCIE_HARD_DEBUG_SERDES_IDDQ_MASK);
+
+ /* Shutdown bridge */
+ setbits_le32(base + PCIE_RGR1_SW_INIT_1, RGR1_SW_INIT_1_INIT_MASK);
+
+ return 0;
+}
+
static int brcm_pcie_of_to_plat(struct udevice *dev)
{
struct brcm_pcie *pcie = dev_get_priv(dev);
@@ -618,6 +636,8 @@ U_BOOT_DRIVER(pcie_brcm_base) = {
.ops = &brcm_pcie_ops,
.of_match = brcm_pcie_ids,
.probe = brcm_pcie_probe,
+ .remove = brcm_pcie_remove,
.of_to_plat = brcm_pcie_of_to_plat,
.priv_auto = sizeof(struct brcm_pcie),
+ .flags = DM_FLAG_OS_PREPARE,
};
--
2.39.5