linux-kernel - [PATCH v6 14/16] PCI: imx6: Add epc_features in imx6_pcie

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Date: Sun, 24 Dec 2023 13:32:40 -0500
From: Frank Li <Frank.Li@....com>
To: krzysztof.kozlowski@...aro.org
Cc: Frank.Li@....com,
	bhelgaas@...gle.com,
	conor+dt@...nel.org,
	devicetree@...r.kernel.org,
	festevam@...il.com,
	helgaas@...nel.org,
	hongxing.zhu@....com,
	imx@...ts.linux.dev,
	kernel@...gutronix.de,
	krzysztof.kozlowski+dt@...aro.org,
	kw@...ux.com,
	l.stach@...gutronix.de,
	linux-arm-kernel@...ts.infradead.org,
	linux-imx@....com,
	linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org,
	lpieralisi@...nel.org,
	manivannan.sadhasivam@...aro.org,
	robh@...nel.org,
	s.hauer@...gutronix.de,
	shawnguo@...nel.org
Subject: [PATCH v6 14/16] PCI: imx6: Add epc_features in imx6_pcie_drvdata

The i.MX EP exhibits variations in epc_features among different EP
configurations. This introduces the addition of epc_features in
imx6_pcie_drvdata to accommodate these differences. It's important to note
that there are no functional changes in this commit; instead, it lays the
groundwork for supporting i.MX95 EP functions.

Signed-off-by: Frank Li <Frank.Li@....com>
---

Notes:
    Change from v5 to v6
    - add missed maxitems.
    - add comments about reuse linux,pci-domain as controller id.
    linux,pci-domain have not defined at PCI endpoint side.
    
    Change from v1 to v3
    - new patch at v3

 drivers/pci/controller/dwc/pci-imx6.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index 4b2b9aafad1b4..6a58fd63a9dd2 100644
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -104,6 +104,7 @@ struct imx6_pcie_drvdata {
 	const u32 ltssm_mask;
 	const u32 mode_off[IMX6_PCIE_MAX_INSTANCES];
 	const u32 mode_mask[IMX6_PCIE_MAX_INSTANCES];
+	const struct pci_epc_features *epc_features;
 	int (*init_phy)(struct imx6_pcie *pcie);
 };
 
@@ -1065,7 +1066,10 @@ static const struct pci_epc_features imx8m_pcie_epc_features = {
 static const struct pci_epc_features*
 imx6_pcie_ep_get_features(struct dw_pcie_ep *ep)
 {
-	return &imx8m_pcie_epc_features;
+	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
+	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pci);
+
+	return imx6_pcie->drvdata->epc_features;
 }
 
 static const struct dw_pcie_ep_ops pcie_ep_ops = {
@@ -1530,6 +1534,7 @@ static const struct imx6_pcie_drvdata drvdata[] = {
 		.mode_mask[0] = IMX6Q_GPR12_DEVICE_TYPE,
 		.mode_off[1] = IOMUXC_GPR12,
 		.mode_mask[1] = IMX8MQ_GPR12_PCIE2_CTRL_DEVICE_TYPE,
+		.epc_features = &imx8m_pcie_epc_features,
 		.init_phy = imx8mq_pcie_init_phy,
 	},
 	[IMX8MM_EP] = {
@@ -1540,6 +1545,7 @@ static const struct imx6_pcie_drvdata drvdata[] = {
 		.clk_names = {"pcie_bus", "pcie", "pcie_aux"},
 		.mode_off[0] = IOMUXC_GPR12,
 		.mode_mask[0] = IMX6Q_GPR12_DEVICE_TYPE,
+		.epc_features = &imx8m_pcie_epc_features,
 	},
 	[IMX8MP_EP] = {
 		.variant = IMX8MP_EP,
@@ -1549,6 +1555,7 @@ static const struct imx6_pcie_drvdata drvdata[] = {
 		.clk_names = {"pcie_bus", "pcie", "pcie_aux"},
 		.mode_off[0] = IOMUXC_GPR12,
 		.mode_mask[0] = IMX6Q_GPR12_DEVICE_TYPE,
+		.epc_features = &imx8m_pcie_epc_features,
 	},
 };
 
-- 
2.34.1