linux-kernel - [PATCH v3 8/9] regulator/rpi-panel-attiny: Use the regmap cache

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Message-Id: <20220124220129.158891-9-detlev.casanova@collabora.com>
Date:   Mon, 24 Jan 2022 17:01:28 -0500
From:   Detlev Casanova <detlev.casanova@...labora.com>
To:     linux-kernel@...r.kernel.org
Cc:     Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Detlev Casanova <detlev.casanova@...labora.com>
Subject: [PATCH v3 8/9] regulator/rpi-panel-attiny: Use the regmap cache

From: Dave Stevenson <dave.stevenson@...pberrypi.com>

The I2C to the Atmel is very fussy, and locks up easily on
Pi0-3 particularly on reads.

The LCD power status is controlled solely by this driver, so
rather than reading it back from the Atmel, use the regmap cache
to avoid reading values.

Signed-off-by: Dave Stevenson <dave.stevenson@...pberrypi.com>
Signed-off-by: Detlev Casanova <detlev.casanova@...labora.com>
---
 drivers/regulator/rpi-panel-attiny-regulator.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/regulator/rpi-panel-attiny-regulator.c b/drivers/regulator/rpi-panel-attiny-regulator.c
index 8090b9a485b5..6e408a4b2c21 100644
--- a/drivers/regulator/rpi-panel-attiny-regulator.c
+++ b/drivers/regulator/rpi-panel-attiny-regulator.c
@@ -76,7 +76,7 @@ static const struct regmap_config attiny_regmap_config = {
 	.val_bits = 8,
 	.disable_locking = 1,
 	.max_register = REG_WRITE_DATA_L,
-	.cache_type = REGCACHE_NONE,
+	.cache_type = REGCACHE_RBTREE,
 };
 
 static int attiny_set_port_state(struct attiny_lcd *state, int reg, u8 val)
-- 
2.34.1