diff mbox series

[13/15] can: tcan4x5x: Fix use of register error status mask

Message ID 20221116205308.2996556-14-msp@baylibre.com
State New
Headers
Series can: m_can: Optimizations for tcan and peripheral chips |

Commit Message

Markus Schneider-Pargmann Nov. 16, 2022, 8:53 p.m. UTC 
  TCAN4X5X_ERROR_STATUS is not a status register that needs clearing
during interrupt handling. Instead this is a masking register that masks
error interrupts. Writing TCAN4X5X_CLEAR_ALL_INT to this register
effectively masks everything.

Rename the register and mask all error interrupts only once by writing
to the register in tcan4x5x_init.

Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
---
 drivers/net/can/m_can/tcan4x5x-core.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

Comments

Marc Kleine-Budde Dec. 2, 2022, 2:19 p.m. UTC | #1 
On 16.11.2022 21:53:06, Markus Schneider-Pargmann wrote:
> TCAN4X5X_ERROR_STATUS is not a status register that needs clearing
> during interrupt handling. Instead this is a masking register that masks
> error interrupts. Writing TCAN4X5X_CLEAR_ALL_INT to this register
> effectively masks everything.
> 
> Rename the register and mask all error interrupts only once by writing
> to the register in tcan4x5x_init.
> 
> Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>

please add a fixes tag.

Marc
diff mbox series

Patch

diff --git a/drivers/net/can/m_can/tcan4x5x-core.c b/drivers/net/can/m_can/tcan4x5x-core.c
index 1fec394b3517..efa2381bf85b 100644
--- a/drivers/net/can/m_can/tcan4x5x-core.c
+++ b/drivers/net/can/m_can/tcan4x5x-core.c
@@ -10,7 +10,7 @@ 
 #define TCAN4X5X_DEV_ID1 0x04
 #define TCAN4X5X_REV 0x08
 #define TCAN4X5X_STATUS 0x0C
-#define TCAN4X5X_ERROR_STATUS 0x10
+#define TCAN4X5X_ERROR_STATUS_MASK 0x10
 #define TCAN4X5X_CONTROL 0x14
 
 #define TCAN4X5X_CONFIG 0x800
@@ -204,12 +204,7 @@  static int tcan4x5x_clear_interrupts(struct m_can_classdev *cdev)
 	if (ret)
 		return ret;
 
-	ret = tcan4x5x_write_tcan_reg(cdev, TCAN4X5X_INT_FLAGS,
-				      TCAN4X5X_CLEAR_ALL_INT);
-	if (ret)
-		return ret;
-
-	return tcan4x5x_write_tcan_reg(cdev, TCAN4X5X_ERROR_STATUS,
+	return tcan4x5x_write_tcan_reg(cdev, TCAN4X5X_INT_FLAGS,
 				       TCAN4X5X_CLEAR_ALL_INT);
 }
 
@@ -229,6 +224,11 @@  static int tcan4x5x_init(struct m_can_classdev *cdev)
 	if (ret)
 		return ret;
 
+	ret = tcan4x5x_write_tcan_reg(cdev, TCAN4X5X_ERROR_STATUS_MASK,
+				      TCAN4X5X_CLEAR_ALL_INT);
+	if (ret)
+		return ret;
+
 	/* Zero out the MCAN buffers */
 	ret = m_can_init_ram(cdev);
 	if (ret)