Enable regmap register cache in order to reduce IO.
Signed-off-by: Antti Palosaari <cr...@iki.fi>
---
drivers/media/dvb-frontends/rtl2832.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/drivers/media/dvb-frontends/rtl2832.c
b/drivers/media/dvb-frontends/rtl2832.c
index b8e7971..4b6e6e0 100644
--- a/drivers/media/dvb-frontends/rtl2832.c
+++ b/drivers/media/dvb-frontends/rtl2832.c
@@ -986,6 +986,22 @@ static struct dvb_frontend_ops rtl2832_ops = {
.read_ber = rtl2832_read_ber,
};
+static bool rtl2832_volatile_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case 0x305:
+ case 0x33c:
+ case 0x34e:
+ case 0x351:
+ case 0x40c ... 0x40d:
+ return true;
+ default:
+ break;
+ }
+
+ return false;
+}
+
/*
* We implement own I2C access routines for regmap in order to get manual
access
* to I2C adapter lock, which is needed for I2C mux adapter.
@@ -1240,9 +1256,11 @@ static int rtl2832_probe(struct i2c_client *client,
static const struct regmap_config regmap_config = {
.reg_bits = 8,
.val_bits = 8,
+ .volatile_reg = rtl2832_volatile_reg,
.max_register = 5 * 0x100,
.ranges = regmap_range_cfg,
.num_ranges = ARRAY_SIZE(regmap_range_cfg),
+ .cache_type = REGCACHE_RBTREE,
};
dev_dbg(&client->dev, "\n");
--
http://palosaari.fi/
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