linux-kernel - [PATCH v4 03/11] PCI: rockchip: Assert PCI Configuration Enable bit after probe

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Message-Id: <20230417092631.347976-4-rick.wertenbroek@gmail.com>
Date:   Mon, 17 Apr 2023 11:26:21 +0200
From:   Rick Wertenbroek <rick.wertenbroek@...il.com>
To:     alberto.dassatti@...g-vd.ch
Cc:     xxm@...k-chips.com, Rick Wertenbroek <rick.wertenbroek@...il.com>,
        stable@...r.kernel.org, Damien Le Moal <dlemoal@...nel.org>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Caleb Connolly <kc@...tmarketos.org>,
        Brian Norris <briannorris@...omium.org>,
        Johan Jonker <jbx6244@...il.com>,
        Corentin Labbe <clabbe@...libre.com>,
        Arnaud Ferraris <arnaud.ferraris@...labora.com>,
        Judy Hsiao <judyhsiao@...omium.org>,
        Hugh Cole-Baker <sigmaris@...il.com>,
        linux-pci@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v4 03/11] PCI: rockchip: Assert PCI Configuration Enable bit after probe

Assert PCI Configuration Enable bit after probe. When this bit is left to
0 in the endpoint mode, the RK3399 PCIe endpoint core will generate
configuration request retry status (CRS) messages back to the root complex.
Assert this bit after probe to allow the RK3399 PCIe endpoint core to reply
to configuration requests from the root complex.
This is documented in section 17.5.8.1.2 of the RK3399 TRM.

Fixes: cf590b078391 ("PCI: rockchip: Add EP driver for Rockchip PCIe controller")
Cc: stable@...r.kernel.org
Signed-off-by: Rick Wertenbroek <rick.wertenbroek@...il.com>
Reviewed-by: Damien Le Moal <dlemoal@...nel.org>
Tested-by: Damien Le Moal <dlemoal@...nel.org>
---
 drivers/pci/controller/pcie-rockchip-ep.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/pci/controller/pcie-rockchip-ep.c b/drivers/pci/controller/pcie-rockchip-ep.c
index 9b835377bd9e..4c84e403e155 100644
--- a/drivers/pci/controller/pcie-rockchip-ep.c
+++ b/drivers/pci/controller/pcie-rockchip-ep.c
@@ -623,6 +623,8 @@ static int rockchip_pcie_ep_probe(struct platform_device *pdev)
 
 	ep->irq_pci_addr = ROCKCHIP_PCIE_EP_DUMMY_IRQ_ADDR;
 
+	rockchip_pcie_write(rockchip, PCIE_CLIENT_CONF_ENABLE, PCIE_CLIENT_CONFIG);
+
 	return 0;
 err_epc_mem_exit:
 	pci_epc_mem_exit(epc);
-- 
2.25.1