[PATCH 4/6] PCI: qcom-ep: Set initial interconnect bandwidth before enabling clocks

[Krishna Chaitanya Chundru]

Some Qualcomm platforms require the interconnect bandwidth constraints
to be set before enabling the interconnect clocks, otherwise some
clocks get stuck in the off state.

Move the icc_set_bw() call before clk_bulk_prepare_enable() so the
bandwidth vote is in place first.

Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru at oss.qualcomm.com>
---
 drivers/pci/controller/dwc/pcie-qcom-ep.c | 34 +++++++++++++++----------------
 1 file changed, 17 insertions(+), 17 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c
index 56184e6ca6e6..0b23d7181539 100644
--- a/drivers/pci/controller/dwc/pcie-qcom-ep.c
+++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c
@@ -331,9 +331,23 @@ static int qcom_pcie_enable_resources(struct qcom_pcie_ep *pcie_ep)
 	struct dw_pcie *pci = &pcie_ep->pci;
 	int ret;
 
+	/*
+	 * Some Qualcomm platforms require interconnect bandwidth constraints
+	 * to be set before enabling interconnect clocks.
+	 *
+	 * Set an initial peak bandwidth corresponding to single-lane Gen 1
+	 * for the pcie-mem path.
+	 */
+	ret = icc_set_bw(pcie_ep->icc_mem, 0, QCOM_PCIE_LINK_SPEED_TO_BW(1));
+	if (ret) {
+		dev_err(pci->dev, "failed to set interconnect bandwidth: %d\n",
+			ret);
+		return ret;
+	}
+
 	ret = clk_bulk_prepare_enable(pcie_ep->num_clks, pcie_ep->clks);
 	if (ret)
-		return ret;
+		goto err_disable_icc;
 
 	ret = qcom_pcie_ep_core_reset(pcie_ep);
 	if (ret)
@@ -351,28 +365,14 @@ static int qcom_pcie_enable_resources(struct qcom_pcie_ep *pcie_ep)
 	if (ret)
 		goto err_phy_exit;
 
-	/*
-	 * Some Qualcomm platforms require interconnect bandwidth constraints
-	 * to be set before enabling interconnect clocks.
-	 *
-	 * Set an initial peak bandwidth corresponding to single-lane Gen 1
-	 * for the pcie-mem path.
-	 */
-	ret = icc_set_bw(pcie_ep->icc_mem, 0, QCOM_PCIE_LINK_SPEED_TO_BW(1));
-	if (ret) {
-		dev_err(pci->dev, "failed to set interconnect bandwidth: %d\n",
-			ret);
-		goto err_phy_off;
-	}
-
 	return 0;
 
-err_phy_off:
-	phy_power_off(pcie_ep->phy);
 err_phy_exit:
 	phy_exit(pcie_ep->phy);
 err_disable_clk:
 	clk_bulk_disable_unprepare(pcie_ep->num_clks, pcie_ep->clks);
+err_disable_icc:
+	icc_set_bw(pcie_ep->icc_mem, 0, 0);
 
 	return ret;
 }

-- 
2.34.1