diff mbox series

[1/5] i2c: stm32f7: fix configuration of the digital filter

Message ID 1612515104-838-2-git-send-email-alain.volmat@foss.st.com
State Accepted
Commit 3d6a3d3a2a7a3a60a824e7c04e95fd50dec57812
Headers show
Series i2c: stm32: filter binding support & debug info | expand

Commit Message

Alain Volmat Feb. 5, 2021, 8:51 a.m. UTC 
The digital filter related computation are present in the driver
however the programming of the filter within the IP is missing.
The maximum value for the DNF is wrong and should be 15 instead of 16.

Fixes: aeb068c57214 ("i2c: i2c-stm32f7: add driver")

Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>
---
 drivers/i2c/busses/i2c-stm32f7.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

Comments

Wolfram Sang Feb. 12, 2021, 10:36 a.m. UTC | #1 
On Fri, Feb 05, 2021 at 09:51:40AM +0100, Alain Volmat wrote:
> The digital filter related computation are present in the driver
> however the programming of the filter within the IP is missing.
> The maximum value for the DNF is wrong and should be 15 instead of 16.
> 
> Fixes: aeb068c57214 ("i2c: i2c-stm32f7: add driver")
> 
> Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>

Applied to for-current, thanks!

The rest will go in within the next cycle.
diff mbox series

Patch

diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-stm32f7.c
index 9aa8e65b511e..473fbe144b7e 100644
--- a/drivers/i2c/busses/i2c-stm32f7.c
+++ b/drivers/i2c/busses/i2c-stm32f7.c
@@ -57,6 +57,8 @@ 
 #define STM32F7_I2C_CR1_RXDMAEN			BIT(15)
 #define STM32F7_I2C_CR1_TXDMAEN			BIT(14)
 #define STM32F7_I2C_CR1_ANFOFF			BIT(12)
+#define STM32F7_I2C_CR1_DNF_MASK		GENMASK(11, 8)
+#define STM32F7_I2C_CR1_DNF(n)			(((n) & 0xf) << 8)
 #define STM32F7_I2C_CR1_ERRIE			BIT(7)
 #define STM32F7_I2C_CR1_TCIE			BIT(6)
 #define STM32F7_I2C_CR1_STOPIE			BIT(5)
@@ -160,7 +162,7 @@  enum {
 };
 
 #define STM32F7_I2C_DNF_DEFAULT			0
-#define STM32F7_I2C_DNF_MAX			16
+#define STM32F7_I2C_DNF_MAX			15
 
 #define STM32F7_I2C_ANALOG_FILTER_ENABLE	1
 #define STM32F7_I2C_ANALOG_FILTER_DELAY_MIN	50	/* ns */
@@ -725,6 +727,13 @@  static void stm32f7_i2c_hw_config(struct stm32f7_i2c_dev *i2c_dev)
 	else
 		stm32f7_i2c_set_bits(i2c_dev->base + STM32F7_I2C_CR1,
 				     STM32F7_I2C_CR1_ANFOFF);
+
+	/* Program the Digital Filter */
+	stm32f7_i2c_clr_bits(i2c_dev->base + STM32F7_I2C_CR1,
+			     STM32F7_I2C_CR1_DNF_MASK);
+	stm32f7_i2c_set_bits(i2c_dev->base + STM32F7_I2C_CR1,
+			     STM32F7_I2C_CR1_DNF(i2c_dev->setup.dnf));
+
 	stm32f7_i2c_set_bits(i2c_dev->base + STM32F7_I2C_CR1,
 			     STM32F7_I2C_CR1_PE);
 }