From: Thierry Reding <thierry.reding@gmail.com>
To: "David S . Miller" <davem@davemloft.net>
Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>,
Alexandre Torgue <alexandre.torgue@st.com>,
Joao Pinto <Joao.Pinto@synopsys.com>,
Jon Hunter <jonathanh@nvidia.com>,
Mikko Perttunen <cyndis@kapsi.fi>,
netdev@vger.kernel.org, linux-tegra@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH v2 4/9] net: stmmac: Balance PTP reference clock enable/disable
Date: Fri, 10 Mar 2017 17:34:56 +0100 [thread overview]
Message-ID: <20170310163501.31811-5-thierry.reding@gmail.com> (raw)
In-Reply-To: <20170310163501.31811-1-thierry.reding@gmail.com>
From: Thierry Reding <treding@nvidia.com>
clk_prepare_enable() and clk_disable_unprepare() for this clock aren't
properly balanced, which can trigger a WARN_ON() in the common clock
framework.
Reviewed-By: Joao Pinto <jpinto@synopsys.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
---
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 4 ++++
drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c | 1 -
2 files changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 6060410d2b9e..ce6d7e791f3f 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -1711,6 +1711,10 @@ static int stmmac_hw_setup(struct net_device *dev, bool init_ptp)
stmmac_mmc_setup(priv);
if (init_ptp) {
+ ret = clk_prepare_enable(priv->plat->clk_ptp_ref);
+ if (ret < 0)
+ netdev_warn(priv->dev, "failed to enable PTP reference clock: %d\n", ret);
+
ret = stmmac_init_ptp(priv);
if (ret == -EOPNOTSUPP)
netdev_warn(priv->dev, "PTP not supported by HW\n");
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index f2d94eafeb0a..fe49c3105755 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -365,7 +365,6 @@ stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
plat->clk_ptp_ref = NULL;
dev_warn(&pdev->dev, "PTP uses main clock\n");
} else {
- clk_prepare_enable(plat->clk_ptp_ref);
plat->clk_ptp_rate = clk_get_rate(plat->clk_ptp_ref);
dev_dbg(&pdev->dev, "PTP rate %d\n", plat->clk_ptp_rate);
}
--
2.12.0
next prev parent reply other threads:[~2017-03-10 16:35 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-10 16:34 [PATCH v2 0/9] net: stmmac: Fixes and Tegra186 support Thierry Reding
2017-03-10 16:34 ` [PATCH v2 1/9] net: stmmac: Rename clk_ptp_ref clock to ptp_ref Thierry Reding
2017-03-20 15:18 ` Rob Herring
2017-03-10 16:34 ` [PATCH v2 2/9] net: stmmac: Stop PHY and remove TX timer on error Thierry Reding
2017-03-10 16:34 ` [PATCH v2 3/9] net: stmmac: Disable PTP reference clock " Thierry Reding
2017-03-10 16:34 ` Thierry Reding [this message]
2017-03-10 16:34 ` [PATCH v2 5/9] net: stmmac: Check for DMA mapping errors Thierry Reding
2017-03-10 16:34 ` [PATCH v2 6/9] net: stmmac: Parse FIFO sizes from feature registers Thierry Reding
2017-03-10 16:34 ` [PATCH v2 7/9] net: stmmac: Program RX queue size and flow control Thierry Reding
2017-03-10 16:35 ` [PATCH v2 8/9] net: stmmac: dwc-qos: Split out ->probe() and ->remove() Thierry Reding
2017-03-10 16:35 ` [PATCH v2 9/9] net: stmmac: dwc-qos: Add Tegra186 support Thierry Reding
2017-03-13 6:35 ` [PATCH v2 0/9] net: stmmac: Fixes and " David Miller
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