1 files changed, 37 insertions, 18 deletions

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 64420ecc24..cbc3f08817 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -147,6 +147,9 @@
 
 #define QCOM_PCIE_CRC8_POLYNOMIAL		(BIT(2) | BIT(1) | BIT(0))
 
+#define QCOM_PCIE_LINK_SPEED_TO_BW(speed) \
+		Mbps_to_icc(PCIE_SPEED2MBS_ENC(pcie_link_speed[speed]))
+
 #define QCOM_PCIE_1_0_0_MAX_CLOCKS		4
 struct qcom_pcie_resources_1_0_0 {
 	struct clk_bulk_data clks[QCOM_PCIE_1_0_0_MAX_CLOCKS];
@@ -218,6 +221,7 @@ struct qcom_pcie_ops {
 	int (*get_resources)(struct qcom_pcie *pcie);
 	int (*init)(struct qcom_pcie *pcie);
 	int (*post_init)(struct qcom_pcie *pcie);
+	void (*host_post_init)(struct qcom_pcie *pcie);
 	void (*deinit)(struct qcom_pcie *pcie);
 	void (*ltssm_enable)(struct qcom_pcie *pcie);
 	int (*config_sid)(struct qcom_pcie *pcie);
@@ -962,6 +966,25 @@ static int qcom_pcie_post_init_2_7_0(struct qcom_pcie *pcie)
 	return 0;
 }
 
+static int qcom_pcie_enable_aspm(struct pci_dev *pdev, void *userdata)
+{
+	/*
+	 * Downstream devices need to be in D0 state before enabling PCI PM
+	 * substates.
+	 */
+	pci_set_power_state_locked(pdev, PCI_D0);
+	pci_enable_link_state_locked(pdev, PCIE_LINK_STATE_ALL);
+
+	return 0;
+}
+
+static void qcom_pcie_host_post_init_2_7_0(struct qcom_pcie *pcie)
+{
+	struct dw_pcie_rp *pp = &pcie->pci->pp;
+
+	pci_walk_bus(pp->bridge->bus, qcom_pcie_enable_aspm, NULL);
+}
+
 static void qcom_pcie_deinit_2_7_0(struct qcom_pcie *pcie)
 {
 	struct qcom_pcie_resources_2_7_0 *res = &pcie->res.v2_7_0;
@@ -1214,9 +1237,19 @@ static void qcom_pcie_host_deinit(struct dw_pcie_rp *pp)
 	pcie->cfg->ops->deinit(pcie);
 }
 
+static void qcom_pcie_host_post_init(struct dw_pcie_rp *pp)
+{
+	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+	struct qcom_pcie *pcie = to_qcom_pcie(pci);
+
+	if (pcie->cfg->ops->host_post_init)
+		pcie->cfg->ops->host_post_init(pcie);
+}
+
 static const struct dw_pcie_host_ops qcom_pcie_dw_ops = {
 	.host_init	= qcom_pcie_host_init,
 	.host_deinit	= qcom_pcie_host_deinit,
+	.host_post_init	= qcom_pcie_host_post_init,
 };
 
 /* Qcom IP rev.: 2.1.0	Synopsys IP rev.: 4.01a */
@@ -1278,6 +1311,7 @@ static const struct qcom_pcie_ops ops_1_9_0 = {
 	.get_resources = qcom_pcie_get_resources_2_7_0,
 	.init = qcom_pcie_init_2_7_0,
 	.post_init = qcom_pcie_post_init_2_7_0,
+	.host_post_init = qcom_pcie_host_post_init_2_7_0,
 	.deinit = qcom_pcie_deinit_2_7_0,
 	.ltssm_enable = qcom_pcie_2_3_2_ltssm_enable,
 	.config_sid = qcom_pcie_config_sid_1_9_0,
@@ -1345,7 +1379,7 @@ static int qcom_pcie_icc_init(struct qcom_pcie *pcie)
 	 * Set an initial peak bandwidth corresponding to single-lane Gen 1
 	 * for the pcie-mem path.
 	 */
-	ret = icc_set_bw(pcie->icc_mem, 0, MBps_to_icc(250));
+	ret = icc_set_bw(pcie->icc_mem, 0, QCOM_PCIE_LINK_SPEED_TO_BW(1));
 	if (ret) {
 		dev_err(pci->dev, "failed to set interconnect bandwidth: %d\n",
 			ret);
@@ -1358,7 +1392,7 @@ static int qcom_pcie_icc_init(struct qcom_pcie *pcie)
 static void qcom_pcie_icc_update(struct qcom_pcie *pcie)
 {
 	struct dw_pcie *pci = pcie->pci;
-	u32 offset, status, bw;
+	u32 offset, status;
 	int speed, width;
 	int ret;
 
@@ -1375,22 +1409,7 @@ static void qcom_pcie_icc_update(struct qcom_pcie *pcie)
 	speed = FIELD_GET(PCI_EXP_LNKSTA_CLS, status);
 	width = FIELD_GET(PCI_EXP_LNKSTA_NLW, status);
 
-	switch (speed) {
-	case 1:
-		bw = MBps_to_icc(250);
-		break;
-	case 2:
-		bw = MBps_to_icc(500);
-		break;
-	default:
-		WARN_ON_ONCE(1);
-		fallthrough;
-	case 3:
-		bw = MBps_to_icc(985);
-		break;
-	}
-
-	ret = icc_set_bw(pcie->icc_mem, 0, width * bw);
+	ret = icc_set_bw(pcie->icc_mem, 0, width * QCOM_PCIE_LINK_SPEED_TO_BW(speed));
 	if (ret) {
 		dev_err(pci->dev, "failed to set interconnect bandwidth: %d\n",
 			ret);