target/linux/bcm27xx/patches-6.1/950-0736-i2c-bcm2835-Do-not-abort-transfers-on-ERR-if-still-a.patch

   1 From f14a14edf12354103e28e8b0336614385766b30a Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.com>
   3 Date: Tue, 23 May 2023 14:14:05 +0100
   4 Subject: [PATCH] i2c-bcm2835: Do not abort transfers on ERR if still
   5  active
   6
   7 If a transaction is aborted immediately on ERR being reported,
   8 then the bus is not returned to the STOP condition, and devices
   9 generally get very upset.
  10
  11 Handle the ERR and CLKT conditions only when TA is not set.
  12
  13 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
  14 ---
  15  drivers/i2c/busses/i2c-bcm2835.c | 2 +-
  16  1 file changed, 1 insertion(+), 1 deletion(-)
  17
  18 --- a/drivers/i2c/busses/i2c-bcm2835.c
  19 +++ b/drivers/i2c/busses/i2c-bcm2835.c
  20 @@ -385,7 +385,7 @@ static irqreturn_t bcm2835_i2c_isr(int t
  21         bcm2835_debug_add(i2c_dev, val);
  22
  23         err = val & (BCM2835_I2C_S_CLKT | BCM2835_I2C_S_ERR);
  24 -       if (err)
  25 +       if (err && !(val & BCM2835_I2C_S_TA))
  26                 i2c_dev->msg_err = err;
  27
  28         if (val & BCM2835_I2C_S_DONE) {