linux-kernel - [PATCH v5 1/8] regmap: Support atomic forced uncached reads

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Date:   Sat, 12 Jun 2021 23:12:31 +0200
From:   Sander Vanheule <sander@...nheule.net>
To:     Pavel Machek <pavel@....cz>, Rob Herring <robh+dt@...nel.org>,
        Lee Jones <lee.jones@...aro.org>,
        Mark Brown <broonie@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Michael Walle <michael@...le.cc>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
        linux-gpio@...r.kernel.org
Cc:     Andrew Lunn <andrew@...n.ch>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        linux-kernel@...r.kernel.org,
        Sander Vanheule <sander@...nheule.net>
Subject: [PATCH v5 1/8] regmap: Support atomic forced uncached reads

When a user wants to read a single uncached register, cache bypassing
can be enabled. However, this is not atomic unless an external lock is
used for the regmap. When using regcache_cache_bypass, the original
bypass state also cannot be restored.

Add support to atomically read a single uncached value, bypassing any
regmap cache.

Signed-off-by: Sander Vanheule <sander@...nheule.net>
---
 drivers/base/regmap/regmap.c | 33 +++++++++++++++++++++++++++++++++
 include/linux/regmap.h       |  8 ++++++++
 2 files changed, 41 insertions(+)

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index fe3e38dd5324..a828f05535b7 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -2745,6 +2745,39 @@ int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val)
 }
 EXPORT_SYMBOL_GPL(regmap_read);
 
+/**
+ * regmap_read_bypassed() - Read a value from a single register, bypassing the cache
+ *
+ * @map: Register map to read from
+ * @reg: Register to be read from
+ * @val: Pointer to store read value
+ *
+ * A value of zero will be returned on success, a negative errno will
+ * be returned in error cases.
+ */
+int regmap_read_bypassed(struct regmap *map, unsigned int reg, unsigned int *val)
+{
+	bool bypass;
+	int ret;
+
+	if (!IS_ALIGNED(reg, map->reg_stride))
+		return -EINVAL;
+
+	map->lock(map->lock_arg);
+
+	bypass = map->cache_bypass;
+	map->cache_bypass = true;
+
+	ret = _regmap_read(map, reg, val);
+
+	map->cache_bypass = bypass;
+
+	map->unlock(map->lock_arg);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(regmap_read_bypassed);
+
 /**
  * regmap_raw_read() - Read raw data from the device
  *
diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index f5f08dd0a116..a54dc00326ba 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -1133,6 +1133,7 @@ int regmap_multi_reg_write_bypassed(struct regmap *map,
 int regmap_raw_write_async(struct regmap *map, unsigned int reg,
 			   const void *val, size_t val_len);
 int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val);
+int regmap_read_bypassed(struct regmap *map, unsigned int reg, unsigned int *val);
 int regmap_raw_read(struct regmap *map, unsigned int reg,
 		    void *val, size_t val_len);
 int regmap_noinc_read(struct regmap *map, unsigned int reg,
@@ -1607,6 +1608,13 @@ static inline int regmap_read(struct regmap *map, unsigned int reg,
 	return -EINVAL;
 }
 
+static inline int regmap_read_bypassed(struct regmap *map, unsigned int reg,
+				       unsigned int *val)
+{
+	WARN_ONCE(1, "regmap API is disabled");
+	return -EINVAL;
+}
+
 static inline int regmap_raw_read(struct regmap *map, unsigned int reg,
 				  void *val, size_t val_len)
 {
-- 
2.31.1