On Mon, 2017-12-25 at 18:27 +0800, Ryder Lee wrote:

On Fri, 2017-12-22 at 13:39 +0800, honghui.zhang-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org wrote:

quoted

From: Honghui Zhang <honghui.zhang-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>

The hardware default value of IDs and class type is not correct,
fix that by setup the correct values before start up.

Signed-off-by: Honghui Zhang <honghui.zhang-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>
---
 drivers/pci/host/pcie-mediatek.c | 12 ++++++++++++
 include/linux/pci_ids.h          |  3 +++
 2 files changed, 15 insertions(+)

diff --git a/drivers/pci/host/pcie-mediatek.c b/drivers/pci/host/pcie-mediatek.c
index fc29a9a..0ef33e4 100644
--- a/drivers/pci/host/pcie-mediatek.c
+++ b/drivers/pci/host/pcie-mediatek.c

@@ -74,6 +74,10 @@
 
 /* PCIe V2 per-port registers */
 #define PCIE_MSI_VECTOR		0x0c0
+
+#define PCIE_CONF_ID		0x100
+#define PCIE_CONF_CLASS		0x104
+
 #define PCIE_INT_MASK		0x420
 #define INTX_MASK		GENMASK(19, 16)
 #define INTX_SHIFT		16

@@ -393,6 +397,14 @@ static int mtk_pcie_startup_port_v2(struct mtk_pcie_port *port)
 		val |= PCIE_CSR_LTSSM_EN(port->slot) |
 		       PCIE_CSR_ASPM_L1_EN(port->slot);
 		writel(val, pcie->base + PCIE_SYS_CFG_V2);
+
+		/* Set up vendor ID and device ID for MT7622*/
+		val = PCI_VENDOR_ID_MEDIATEK | (PCI_DEVICE_ID_MT7622 << 16);
+		writel(val, port->base + PCIE_CONF_ID);

IMHO, this is a general function so you can ignore "device ID for
MT7622" here, but just make sure class code/vendor ID correct.

Hmm, this condition is only for MT7622 for now.
Well, host driver and framework does not cares about the device ID for
host bridge. I guess I can bypass the setting of device ID.

thanks.

quoted

+		/* Set up class code for MT7622 */
+		val = PCI_CLASS_BRIDGE_PCI << 16;
+		writel(val, port->base + PCIE_CONF_CLASS);
 	}
 
 	/* Assert all reset signals */

diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
index ab20dc5..000c5df 100644

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