linux-kernel - [PATCH] PCI: mediatek: Verify whether the free

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Date:   Thu, 29 Apr 2021 19:17:49 +0530
From:   Amey Narkhede <ameynarkhede03@...il.com>
To:     Ryder Lee <ryder.lee@...iatek.com>
Cc:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        Amey Narkhede <ameynarkhede03@...il.com>
Subject: [PATCH] PCI: mediatek: Verify whether the free_ck clock is ungated or not

Verify that the free_ck clock is ungated on device resume
by checking return value of clk_prepare_enable().

Signed-off-by: Amey Narkhede <ameynarkhede03@...il.com>
---
 drivers/pci/controller/pcie-mediatek.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c
index 23548b517..9b13214bf 100644
--- a/drivers/pci/controller/pcie-mediatek.c
+++ b/drivers/pci/controller/pcie-mediatek.c
@@ -1154,11 +1154,14 @@ static int __maybe_unused mtk_pcie_resume_noirq(struct device *dev)
 {
 	struct mtk_pcie *pcie = dev_get_drvdata(dev);
 	struct mtk_pcie_port *port, *tmp;
+	int ret;

 	if (list_empty(&pcie->ports))
 		return 0;

-	clk_prepare_enable(pcie->free_ck);
+	ret = clk_prepare_enable(pcie->free_ck);
+	if (ret)
+		return ret;

 	list_for_each_entry_safe(port, tmp, &pcie->ports, list)
 		mtk_pcie_enable_port(port);
--
2.31.1