target/linux/layerscape/patches-4.4/7190-staging-fsl-mc-root-dprc-rescan-attribute-to-sync-ke.patch

   1 From 75b607ff8725eac74f3375b3370f7d121d1827a3 Mon Sep 17 00:00:00 2001
   2 From: Lijun Pan <Lijun.Pan@freescale.com>
   3 Date: Mon, 8 Feb 2016 17:40:14 -0600
   4 Subject: [PATCH 190/226] staging: fsl-mc: root dprc rescan attribute to sync
   5  kernel with MC
   6
   7 Introduce the rescan attribute as a device attribute to
   8 synchronize the fsl-mc bus objects and the MC firmware.
   9
  10 To rescan the root dprc only, e.g.
  11 echo 1 > /sys/bus/fsl-mc/devices/dprc.1/rescan
  12
  13 Signed-off-by: Lijun Pan <Lijun.Pan@freescale.com>
  14 [Stuart: resolved merge conflict]
  15 Signed-off-by: Stuart Yoder <stuart.yoder@nxp.com>
  16 ---
  17  drivers/staging/fsl-mc/bus/mc-bus.c |   29 +++++++++++++++++++++++++++++
  18  1 file changed, 29 insertions(+)
  19
  20 --- a/drivers/staging/fsl-mc/bus/mc-bus.c
  21 +++ b/drivers/staging/fsl-mc/bus/mc-bus.c
  22 @@ -96,8 +96,37 @@ static ssize_t modalias_show(struct devi
  23  }
  24  static DEVICE_ATTR_RO(modalias);
  25
  26 +static ssize_t rescan_store(struct device *dev,
  27 +                           struct device_attribute *attr,
  28 +                           const char *buf, size_t count)
  29 +{
  30 +       unsigned long val;
  31 +       unsigned int irq_count;
  32 +       struct fsl_mc_device *root_mc_dev;
  33 +       struct fsl_mc_bus *root_mc_bus;
  34 +
  35 +       if (!fsl_mc_is_root_dprc(dev))
  36 +               return -EINVAL;
  37 +
  38 +       root_mc_dev = to_fsl_mc_device(dev);
  39 +       root_mc_bus = to_fsl_mc_bus(root_mc_dev);
  40 +
  41 +       if (kstrtoul(buf, 0, &val) < 0)
  42 +               return -EINVAL;
  43 +
  44 +       if (val) {
  45 +               mutex_lock(&root_mc_bus->scan_mutex);
  46 +               dprc_scan_objects(root_mc_dev, &irq_count);
  47 +               mutex_unlock(&root_mc_bus->scan_mutex);
  48 +       }
  49 +
  50 +       return count;
  51 +}
  52 +static DEVICE_ATTR_WO(rescan);
  53 +
  54  static struct attribute *fsl_mc_dev_attrs[] = {
  55         &dev_attr_modalias.attr,
  56 +       &dev_attr_rescan.attr,
  57         NULL,
  58  };
  59