From: Grygorii Strashko <grygorii.strashko@ti.com>
To: "David S. Miller" <davem@davemloft.net>, <netdev@vger.kernel.org>,
Mugunthan V N <mugunthanvnm@ti.com>,
Richard Cochran <richardcochran@gmail.com>
Cc: Sekhar Nori <nsekhar@ti.com>, <linux-kernel@vger.kernel.org>,
<linux-omap@vger.kernel.org>, Rob Herring <robh+dt@kernel.org>,
<devicetree@vger.kernel.org>,
Murali Karicheri <m-karicheri2@ti.com>,
Wingman Kwok <w-kwok2@ti.com>,
Grygorii Strashko <grygorii.strashko@ti.com>
Subject: [PATCH v2 04/13] net: ethernet: ti: cpts: fix unbalanced clk api usage in cpts_register/unregister
Date: Mon, 28 Nov 2016 17:03:28 -0600 [thread overview]
Message-ID: <20161128230337.6731-5-grygorii.strashko@ti.com> (raw)
In-Reply-To: <20161128230337.6731-1-grygorii.strashko@ti.com>
There are two issues with TI CPTS code which are reproducible when TI
CPSW ethX device passes few up/down iterations:
- cpts refclk prepare counter continuously incremented after each
up/down iteration;
- devm_clk_get(dev, "cpts") is called many times.
Hence, fix these issues by using clk_disable_unprepare() in
cpts_clk_release() and skipping devm_clk_get() if cpts refclk has been
acquired already.
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
---
drivers/net/ethernet/ti/cpts.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)
diff --git a/drivers/net/ethernet/ti/cpts.c b/drivers/net/ethernet/ti/cpts.c
index b26d6fe..101e17b 100644
--- a/drivers/net/ethernet/ti/cpts.c
+++ b/drivers/net/ethernet/ti/cpts.c
@@ -230,18 +230,20 @@ static void cpts_overflow_check(struct work_struct *work)
static void cpts_clk_init(struct device *dev, struct cpts *cpts)
{
- cpts->refclk = devm_clk_get(dev, "cpts");
- if (IS_ERR(cpts->refclk)) {
- dev_err(dev, "Failed to get cpts refclk\n");
- cpts->refclk = NULL;
- return;
+ if (!cpts->refclk) {
+ cpts->refclk = devm_clk_get(dev, "cpts");
+ if (IS_ERR(cpts->refclk)) {
+ dev_err(dev, "Failed to get cpts refclk\n");
+ cpts->refclk = NULL;
+ return;
+ }
}
clk_prepare_enable(cpts->refclk);
}
static void cpts_clk_release(struct cpts *cpts)
{
- clk_disable(cpts->refclk);
+ clk_disable_unprepare(cpts->refclk);
}
static int cpts_match(struct sk_buff *skb, unsigned int ptp_class,
--
2.10.1
next prev parent reply other threads:[~2016-11-28 23:10 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-28 23:03 [PATCH v2 00/13] net: ethernet: ti: cpts: update and fixes Grygorii Strashko
2016-11-28 23:03 ` [PATCH v2 01/13] net: ethernet: ti: cpts: switch to readl/writel_relaxed() Grygorii Strashko
2016-11-29 9:38 ` Richard Cochran
2016-11-28 23:03 ` [PATCH v2 02/13] net: ethernet: ti: allow cpts to be built separately Grygorii Strashko
2016-11-29 9:37 ` Richard Cochran
2016-11-28 23:03 ` [PATCH v2 03/13] net: ethernet: ti: cpsw: minimize direct access to struct cpts Grygorii Strashko
2016-11-28 23:03 ` Grygorii Strashko [this message]
2016-11-29 9:48 ` [PATCH v2 04/13] net: ethernet: ti: cpts: fix unbalanced clk api usage in cpts_register/unregister Richard Cochran
2016-11-28 23:03 ` [PATCH v2 05/13] net: ethernet: ti: cpts: fix registration order Grygorii Strashko
2016-11-29 9:48 ` Richard Cochran
2016-11-28 23:03 ` [PATCH v2 06/13] net: ethernet: ti: cpts: disable cpts when unregistered Grygorii Strashko
2016-11-29 9:49 ` Richard Cochran
2016-11-28 23:03 ` [PATCH v2 07/13] net: ethernet: ti: cpts: rework initialization/deinitialization Grygorii Strashko
2016-11-29 10:07 ` Richard Cochran
2016-11-29 15:50 ` Grygorii Strashko
2016-11-30 18:30 ` Grygorii Strashko
2016-11-28 23:03 ` [PATCH v2 08/13] net: ethernet: ti: cpts: move dt props parsing to cpts driver Grygorii Strashko
2016-11-29 10:11 ` Richard Cochran
2016-11-29 15:54 ` Grygorii Strashko
2016-11-28 23:03 ` [PATCH v2 09/13] net: ethernet: ti: cpts: clean up event list if event pool is empty Grygorii Strashko
2016-11-29 10:13 ` Richard Cochran
2016-11-28 23:03 ` [PATCH v2 10/13] net: ethernet: ti: cpts: drop excessive writes to CTRL and INT_EN regs Grygorii Strashko
2016-11-29 10:14 ` Richard Cochran
2016-11-28 23:03 ` [PATCH v2 11/13] clocksource: export the clocks_calc_mult_shift to use by timestamp code Grygorii Strashko
2016-11-29 9:08 ` Thomas Gleixner
2016-11-28 23:03 ` [PATCH v2 12/13] net: ethernet: ti: cpts: calc mult and shift from refclk freq Grygorii Strashko
2016-11-29 10:34 ` Richard Cochran
2016-11-29 16:22 ` Grygorii Strashko
2016-11-28 23:03 ` [PATCH v2 13/13] net: ethernet: ti: cpts: fix overflow check period Grygorii Strashko
2016-11-30 9:12 ` Richard Cochran
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