All of lore.kernel.org
 help / color / mirror / Atom feed
From: Andrew Murray <andrew.murray@arm.com>
To: Mathieu Poirier <mathieu.poirier@linaro.org>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: coresight@lists.linaro.org, Sudeep Holla <sudeep.holla@arm.com>,
	Leo Yan <leo.yan@linaro.org>,
	linux-arm-kernel@lists.infradead.org,
	Mike Leach <mike.leach@linaro.org>
Subject: [PATCH v3 4/6] coresight: etm4x: improve clarity of etm4_os_unlock comment
Date: Thu, 11 Jul 2019 17:01:12 +0100	[thread overview]
Message-ID: <20190711160114.634-5-andrew.murray@arm.com> (raw)
In-Reply-To: <20190711160114.634-1-andrew.murray@arm.com>

To improve clarity, let's update the comment for etm4_os_unlock
to use the name of the register as per the ETM architecture
specification.

The existing comment is also misleading as it suggests any value
written to TRCOSLAR unlocks the trace registers, however it must
be '0' - let's also correct this.

Signed-off-by: Andrew Murray <andrew.murray@arm.com>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 drivers/hwtracing/coresight/coresight-etm4x.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
index 451f2b24cc03..d993359e2117 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x.c
@@ -48,7 +48,7 @@ static enum cpuhp_state hp_online;
 
 static void etm4_os_unlock(struct etmv4_drvdata *drvdata)
 {
-	/* Writing any value to ETMOSLAR unlocks the trace registers */
+	/* Writing 0 to TRCOSLAR unlocks the trace registers */
 	writel_relaxed(0x0, drvdata->base + TRCOSLAR);
 	drvdata->os_unlock = true;
 	isb();
-- 
2.21.0


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  parent reply	other threads:[~2019-07-11 16:02 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-11 16:01 [PATCH v3 0/6] coresight: etm4x: save/restore ETMv4 context across CPU low power states Andrew Murray
2019-07-11 16:01 ` [PATCH v3 1/6] coresight: etm4x: remove superfluous setting of os_unlock Andrew Murray
2019-07-11 16:01 ` [PATCH v3 2/6] coresight: etm4x: use explicit barriers on enable/disable Andrew Murray
2019-07-11 16:01   ` Andrew Murray
2019-07-11 16:01 ` [PATCH v3 3/6] coresight: etm4x: use module_param instead of module_param_named Andrew Murray
2019-07-11 16:01 ` Andrew Murray [this message]
2019-07-11 16:01 ` [PATCH v3 5/6] coresight: etm4x: save/restore state across CPU low power states Andrew Murray
2019-07-12 15:00   ` [PATCH] coresight: etm4x: lazily allocate memory for save_state Andrew Murray
2019-07-22 20:32     ` Mathieu Poirier
2019-07-23  9:05       ` Suzuki K Poulose
2019-07-26 11:24         ` Andrew Murray
2019-07-30 10:15           ` Suzuki K Poulose
2019-07-15 14:22   ` [PATCH v3 5/6] coresight: etm4x: save/restore state across CPU low power states Mike Leach
2019-07-16 11:50     ` Andrew Murray
2019-07-16 14:43       ` Mike Leach
2019-07-15 23:04   ` Mathieu Poirier
2019-07-16 11:52     ` Andrew Murray
2019-07-11 16:01 ` [PATCH v3 6/6] dt-bindings: arm: coresight: Add support for coresight-needs-save-restore Andrew Murray

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20190711160114.634-5-andrew.murray@arm.com \
    --to=andrew.murray@arm.com \
    --cc=alexander.shishkin@linux.intel.com \
    --cc=coresight@lists.linaro.org \
    --cc=leo.yan@linaro.org \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=mathieu.poirier@linaro.org \
    --cc=mike.leach@linaro.org \
    --cc=sudeep.holla@arm.com \
    --cc=suzuki.poulose@arm.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.