linux-kernel - [PATCH] PCI: apple: Enable clock gating

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Message-Id: <20211117141916.197192-1-marcan@marcan.st>
Date:   Wed, 17 Nov 2021 23:19:16 +0900
From:   Hector Martin <marcan@...can.st>
To:     Marc Zyngier <maz@...nel.org>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>
Cc:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, Hector Martin <marcan@...can.st>
Subject: [PATCH] PCI: apple: Enable clock gating

These pokes are not required to make the PCIe port work, but it sounds
like this should save some power at least.

Signed-off-by: Hector Martin <marcan@...can.st>
---
 drivers/pci/controller/pcie-apple.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/pci/controller/pcie-apple.c b/drivers/pci/controller/pcie-apple.c
index 420c291a5c68..03bfe977c579 100644
--- a/drivers/pci/controller/pcie-apple.c
+++ b/drivers/pci/controller/pcie-apple.c
@@ -553,6 +553,9 @@ static int apple_pcie_setup_port(struct apple_pcie *pcie,
 		return ret;
 	}
 
+	rmw_clear(PORT_REFCLK_CGDIS, port->base + PORT_REFCLK);
+	rmw_clear(PORT_APPCLK_CGDIS, port->base + PORT_APPCLK);
+
 	ret = apple_pcie_port_setup_irq(port);
 	if (ret)
 		return ret;
-- 
2.33.0