linux-kernel - [PATCH v3 14/15] coresight: etm4x: Cleanup TRCBBCTLR register accesses

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Message-Id: <20220304171913.2292458-15-james.clark@arm.com>
Date:   Fri,  4 Mar 2022 17:19:11 +0000
From:   James Clark <james.clark@....com>
To:     suzuki.poulose@....com, coresight@...ts.linaro.org,
        mike.leach@...aro.org, anshuman.khandual@....com
Cc:     mathieu.poirier@...aro.org, leo.yan@...aro.com,
        James Clark <james.clark@....com>,
        Leo Yan <leo.yan@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 14/15] coresight: etm4x: Cleanup TRCBBCTLR register accesses

This is a no-op change for style and consistency and has no effect on
the binary output by the compiler. In sysreg.h fields are defined as
the register name followed by the field name and then _MASK. This
allows for grepping for fields by name rather than using magic numbers.

Signed-off-by: James Clark <james.clark@....com>
---
 drivers/hwtracing/coresight/coresight-etm4x-sysfs.c | 4 ++--
 drivers/hwtracing/coresight/coresight-etm4x.h       | 3 +++
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
index 25f76a656308..3ae6f4432646 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
@@ -707,10 +707,10 @@ static ssize_t bb_ctrl_store(struct device *dev,
 	 * individual range comparators. If include then at least 1
 	 * range must be selected.
 	 */
-	if ((val & BIT(8)) && (BMVAL(val, 0, 7) == 0))
+	if ((val & TRCBBCTLR_MODE) && (FIELD_GET(TRCBBCTLR_RANGE_MASK, val) == 0))
 		return -EINVAL;
 
-	config->bb_ctrl = val & GENMASK(8, 0);
+	config->bb_ctrl = val & (TRCBBCTLR_MODE | TRCBBCTLR_RANGE_MASK);
 	return size;
 }
 static DEVICE_ATTR_RW(bb_ctrl);
diff --git a/drivers/hwtracing/coresight/coresight-etm4x.h b/drivers/hwtracing/coresight/coresight-etm4x.h
index 3b81c104a44b..15704982357f 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.h
+++ b/drivers/hwtracing/coresight/coresight-etm4x.h
@@ -220,6 +220,9 @@
 
 #define TRCSSPCICRn_PC_MASK			GENMASK(7, 0)
 
+#define TRCBBCTLR_MODE				BIT(8)
+#define TRCBBCTLR_RANGE_MASK			GENMASK(7, 0)
+
 /*
  * System instructions to access ETM registers.
  * See ETMv4.4 spec ARM IHI0064F section 4.3.6 System instructions
-- 
2.28.0