target/linux/bcm27xx/patches-4.19/950-0483-soc-bcm-bcm2835-pm-Fix-error-paths-of-initialization.patch

   1 From 8d9f3526529d857376c661c21820a0049c2e62de Mon Sep 17 00:00:00 2001
   2 From: Eric Anholt <eric@anholt.net>
   3 Date: Sat, 12 Jan 2019 08:07:43 -0800
   4 Subject: [PATCH] soc: bcm: bcm2835-pm: Fix error paths of
   5  initialization.
   6
   7 The clock driver may probe after ours and so we need to pass the
   8 -EPROBE_DEFER out.  Fix the other error path while we're here.
   9
  10 v2: Use dom->name instead of dom->gov as the flag for initialized
  11     domains, since we aren't setting up a governor.  Make sure to
  12     clear ->clk when no clk is present in the DT.
  13
  14 Signed-off-by: Eric Anholt <eric@anholt.net>
  15 Fixes: 670c672608a1 ("soc: bcm: bcm2835-pm: Add support for power domains under a new binding.")
  16 ---
  17  drivers/soc/bcm/bcm2835-power.c | 35 ++++++++++++++++++++++++++++-----
  18  1 file changed, 30 insertions(+), 5 deletions(-)
  19
  20 --- a/drivers/soc/bcm/bcm2835-power.c
  21 +++ b/drivers/soc/bcm/bcm2835-power.c
  22 @@ -485,7 +485,7 @@ static int bcm2835_power_pd_power_off(st
  23         }
  24  }
  25
  26 -static void
  27 +static int
  28  bcm2835_init_power_domain(struct bcm2835_power *power,
  29                           int pd_xlate_index, const char *name)
  30  {
  31 @@ -493,6 +493,17 @@ bcm2835_init_power_domain(struct bcm2835
  32         struct bcm2835_power_domain *dom = &power->domains[pd_xlate_index];
  33
  34         dom->clk = devm_clk_get(dev->parent, name);
  35 +       if (IS_ERR(dom->clk)) {
  36 +               int ret = PTR_ERR(dom->clk);
  37 +
  38 +               if (ret == -EPROBE_DEFER)
  39 +                       return ret;
  40 +
  41 +               /* Some domains don't have a clk, so make sure that we
  42 +                * don't deref an error pointer later.
  43 +                */
  44 +               dom->clk = NULL;
  45 +       }
  46
  47         dom->base.name = name;
  48         dom->base.power_on = bcm2835_power_pd_power_on;
  49 @@ -505,6 +516,8 @@ bcm2835_init_power_domain(struct bcm2835
  50         pm_genpd_init(&dom->base, NULL, true);
  51
  52         power->pd_xlate.domains[pd_xlate_index] = &dom->base;
  53 +
  54 +       return 0;
  55  }
  56
  57  /** bcm2835_reset_reset - Resets a block that has a reset line in the
  58 @@ -602,7 +615,7 @@ static int bcm2835_power_probe(struct pl
  59                 { BCM2835_POWER_DOMAIN_IMAGE_PERI, BCM2835_POWER_DOMAIN_CAM0 },
  60                 { BCM2835_POWER_DOMAIN_IMAGE_PERI, BCM2835_POWER_DOMAIN_CAM1 },
  61         };
  62 -       int ret, i;
  63 +       int ret = 0, i;
  64         u32 id;
  65
  66         power = devm_kzalloc(dev, sizeof(*power), GFP_KERNEL);
  67 @@ -629,8 +642,11 @@ static int bcm2835_power_probe(struct pl
  68
  69         power->pd_xlate.num_domains = ARRAY_SIZE(power_domain_names);
  70
  71 -       for (i = 0; i < ARRAY_SIZE(power_domain_names); i++)
  72 -               bcm2835_init_power_domain(power, i, power_domain_names[i]);
  73 +       for (i = 0; i < ARRAY_SIZE(power_domain_names); i++) {
  74 +               ret = bcm2835_init_power_domain(power, i, power_domain_names[i]);
  75 +               if (ret)
  76 +                       goto fail;
  77 +       }
  78
  79         for (i = 0; i < ARRAY_SIZE(domain_deps); i++) {
  80                 pm_genpd_add_subdomain(&power->domains[domain_deps[i].parent].base,
  81 @@ -644,12 +660,21 @@ static int bcm2835_power_probe(struct pl
  82
  83         ret = devm_reset_controller_register(dev, &power->reset);
  84         if (ret)
  85 -               return ret;
  86 +               goto fail;
  87
  88         of_genpd_add_provider_onecell(dev->parent->of_node, &power->pd_xlate);
  89
  90         dev_info(dev, "Broadcom BCM2835 power domains driver");
  91         return 0;
  92 +
  93 +fail:
  94 +       for (i = 0; i < ARRAY_SIZE(power_domain_names); i++) {
  95 +               struct generic_pm_domain *dom = &power->domains[i].base;
  96 +
  97 +               if (dom->name)
  98 +                       pm_genpd_remove(dom);
  99 +       }
 100 +       return ret;
 101  }
 102
 103  static int bcm2835_power_remove(struct platform_device *pdev)