target/linux/mediatek/patches-6.1/350-15-cpufreq-mediatek-Handle-sram-regulator-probe-deferra.patch

   1 From 75d19b24aa3203d6c78e4c431c2cc07157ce12fe Mon Sep 17 00:00:00 2001
   2 From: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
   3 Date: Wed, 13 Jul 2022 13:15:36 +0200
   4 Subject: [PATCH 15/21] cpufreq: mediatek: Handle sram regulator probe deferral
   5
   6 If the regulator_get_optional() call for the SRAM regulator returns
   7 a probe deferral, we must bail out and retry probing later: failing
   8 to do this will produce unstabilities on platforms requiring the
   9 handling for this regulator.
  10
  11 Fixes: ffa7bdf7f344 ("cpufreq: mediatek: Make sram regulator optional")
  12 Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
  13 Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
  14 ---
  15  drivers/cpufreq/mediatek-cpufreq.c | 8 ++++++--
  16  1 file changed, 6 insertions(+), 2 deletions(-)
  17
  18 --- a/drivers/cpufreq/mediatek-cpufreq.c
  19 +++ b/drivers/cpufreq/mediatek-cpufreq.c
  20 @@ -439,9 +439,13 @@ static int mtk_cpu_dvfs_info_init(struct
  21
  22         /* Both presence and absence of sram regulator are valid cases. */
  23         info->sram_reg = regulator_get_optional(cpu_dev, "sram");
  24 -       if (IS_ERR(info->sram_reg))
  25 +       if (IS_ERR(info->sram_reg)) {
  26 +               ret = PTR_ERR(info->sram_reg);
  27 +               if (ret == -EPROBE_DEFER)
  28 +                       goto out_free_resources;
  29 +
  30                 info->sram_reg = NULL;
  31 -       else {
  32 +       } else {
  33                 ret = regulator_enable(info->sram_reg);
  34                 if (ret) {
  35                         dev_warn(cpu_dev, "cpu%d: failed to enable vsram\n", cpu);