target/linux/layerscape/patches-5.4/808-i2c-0013-LF-98-i2c-imx-fix-the-judgement-of-slave-mode-in-isr.patch

   1 From 85048a8a0df324df94f9585c1e01d0a4419de4dc Mon Sep 17 00:00:00 2001
   2 From: Clark Wang <xiaoning.wang@nxp.com>
   3 Date: Wed, 27 Nov 2019 14:23:55 +0800
   4 Subject: [PATCH] LF-98 i2c: imx: fix the judgement of slave mode in isr
   5
   6 The I2CR[MSTA] will be modified by software or hardware even in master
   7 mode. The judgment of slave mode by reading CR register is unreliable.
   8 Change to use i2c_imx->slave registered status to judge i2c mode.
   9
  10 Acked-by: Fugang Duan <fugang.duan@nxp.com>
  11 Signed-off-by: Clark Wang <xiaoning.wang@nxp.com>
  12 ---
  13  drivers/i2c/busses/i2c-imx.c | 13 +++++--------
  14  1 file changed, 5 insertions(+), 8 deletions(-)
  15
  16 --- a/drivers/i2c/busses/i2c-imx.c
  17 +++ b/drivers/i2c/busses/i2c-imx.c
  18 @@ -1451,23 +1451,20 @@ static const struct i2c_algorithm i2c_im
  19  static irqreturn_t i2c_imx_isr(int irq, void *dev_id)
  20  {
  21         struct imx_i2c_struct *i2c_imx = dev_id;
  22 -       unsigned int status, ctl;
  23 -       irqreturn_t irq_status = IRQ_NONE;
  24 +       unsigned int status;
  25
  26         status = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2SR);
  27 -       ctl = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR);
  28
  29         if (status & I2SR_IIF) {
  30                 i2c_imx_clr_if_bit(status, i2c_imx);
  31 -               if (ctl & I2CR_MSTA)
  32 -                       irq_status = i2c_imx_master_isr(i2c_imx);
  33  #if IS_ENABLED(CONFIG_I2C_SLAVE)
  34 -               else
  35 -                       irq_status = i2c_imx_slave_isr(i2c_imx);
  36 +               if (i2c_imx->slave)
  37 +                       return i2c_imx_slave_isr(i2c_imx);
  38  #endif
  39 +               return i2c_imx_master_isr(i2c_imx);
  40         }
  41
  42 -       return irq_status;
  43 +       return IRQ_NONE;
  44  }
  45
  46  static int i2c_imx_probe(struct platform_device *pdev)