target/linux/layerscape/patches-5.4/808-i2c-0004-MLK-16203-enable-runtime-pm-of-i2c-temporary-when-do.patch

   1 From 4a76bb8458cbe93309314c58f276087569b2fc48 Mon Sep 17 00:00:00 2001
   2 From: Gao Pan <pandy.gao@nxp.com>
   3 Date: Fri, 18 Aug 2017 18:35:11 +0800
   4 Subject: [PATCH] MLK-16203 enable runtime pm of i2c temporary when do system
   5  suspend
   6
   7 When we do system suspend, the runtime pm will be disabled, but we need
   8 to control the PMIC to power on/off the regulator, if the runtime pm is
   9 disabled, if will failed to request runtime wakeup. So data transfer will
  10 failed.
  11
  12 Signed-off-by: Bai Ping <ping.bai@nxp.com>
  13 Signed-off-by: Gao Pan <pandy.gao@nxp.com>
  14 Signed-off-by: Vipul Kumar <vipul_kumar@mentor.com>
  15 (cherry picked from commit 93adab71408f1f162015e77715dd04ce2301d673)
  16 ---
  17  drivers/i2c/busses/i2c-imx.c | 12 +++++++++++-
  18  1 file changed, 11 insertions(+), 1 deletion(-)
  19
  20 --- a/drivers/i2c/busses/i2c-imx.c
  21 +++ b/drivers/i2c/busses/i2c-imx.c
  22 @@ -896,10 +896,17 @@ static int i2c_imx_xfer(struct i2c_adapt
  23         unsigned int i, temp;
  24         int result;
  25         bool is_lastmsg = false;
  26 +       bool enable_runtime_pm = false;
  27         struct imx_i2c_struct *i2c_imx = i2c_get_adapdata(adapter);
  28
  29         dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__);
  30
  31 +
  32 +       if (!pm_runtime_enabled(i2c_imx->adapter.dev.parent)) {
  33 +               pm_runtime_enable(i2c_imx->adapter.dev.parent);
  34 +               enable_runtime_pm = true;
  35 +       }
  36 +
  37         result = pm_runtime_get_sync(i2c_imx->adapter.dev.parent);
  38         if (result < 0)
  39                 goto out;
  40 @@ -971,6 +978,9 @@ fail0:
  41         pm_runtime_put_autosuspend(i2c_imx->adapter.dev.parent);
  42
  43  out:
  44 +       if (enable_runtime_pm)
  45 +               pm_runtime_disable(i2c_imx->adapter.dev.parent);
  46 +
  47         dev_dbg(&i2c_imx->adapter.dev, "<%s> exit with: %s: %d\n", __func__,
  48                 (result < 0) ? "error" : "success msg",
  49                         (result < 0) ? result : num);
  50 @@ -1259,7 +1269,7 @@ static int i2c_imx_resume(struct device
  51  }
  52
  53  static const struct dev_pm_ops i2c_imx_pm_ops = {
  54 -       SET_SYSTEM_SLEEP_PM_OPS(i2c_imx_suspend, i2c_imx_resume)
  55 +       SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(i2c_imx_suspend, i2c_imx_resume)
  56         SET_RUNTIME_PM_OPS(i2c_imx_runtime_suspend,
  57                            i2c_imx_runtime_resume, NULL)
  58  };