git.openwrt.org Git - openwrt/staging/pepe2k.git/blob

   1 From 7b808449f572d07bee840cd9da7e2fe6a1b8f4b5 Mon Sep 17 00:00:00 2001
   2 From: Rajendra Nayak <rnayak@codeaurora.org>
   3 Date: Fri, 6 Aug 2021 09:59:46 +0100
   4 Subject: [PATCH] nvmem: qfprom: sc7280: Handle the additional power-domains
   5  vote
   6
   7 On sc7280, to reliably blow fuses, we need an additional vote
   8 on max performance state of 'MX' power-domain.
   9 Add support for power-domain performance state voting in the
  10 driver.
  11
  12 Reviewed-by: Douglas Anderson <dianders@chromium.org>
  13 Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
  14 Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
  15 Link: https://lore.kernel.org/r/20210806085947.22682-4-srinivas.kandagatla@linaro.org
  16 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  17 ---
  18  drivers/nvmem/qfprom.c | 25 +++++++++++++++++++++++++
  19  1 file changed, 25 insertions(+)
  20
  21 --- a/drivers/nvmem/qfprom.c
  22 +++ b/drivers/nvmem/qfprom.c
  23 @@ -12,6 +12,8 @@
  24  #include <linux/mod_devicetable.h>
  25  #include <linux/nvmem-provider.h>
  26  #include <linux/platform_device.h>
  27 +#include <linux/pm_domain.h>
  28 +#include <linux/pm_runtime.h>
  29  #include <linux/property.h>
  30  #include <linux/regulator/consumer.h>
  31
  32 @@ -142,6 +144,9 @@ static void qfprom_disable_fuse_blowing(
  33         writel(old->timer_val, priv->qfpconf + QFPROM_BLOW_TIMER_OFFSET);
  34         writel(old->accel_val, priv->qfpconf + QFPROM_ACCEL_OFFSET);
  35
  36 +       dev_pm_genpd_set_performance_state(priv->dev, 0);
  37 +       pm_runtime_put(priv->dev);
  38 +
  39         /*
  40          * This may be a shared rail and may be able to run at a lower rate
  41          * when we're not blowing fuses.  At the moment, the regulator framework
  42 @@ -212,6 +217,14 @@ static int qfprom_enable_fuse_blowing(co
  43                 goto err_clk_rate_set;
  44         }
  45
  46 +       ret = pm_runtime_get_sync(priv->dev);
  47 +       if (ret < 0) {
  48 +               pm_runtime_put_noidle(priv->dev);
  49 +               dev_err(priv->dev, "Failed to enable power-domain\n");
  50 +               goto err_reg_enable;
  51 +       }
  52 +       dev_pm_genpd_set_performance_state(priv->dev, INT_MAX);
  53 +
  54         old->timer_val = readl(priv->qfpconf + QFPROM_BLOW_TIMER_OFFSET);
  55         old->accel_val = readl(priv->qfpconf + QFPROM_ACCEL_OFFSET);
  56         writel(priv->soc_data->qfprom_blow_timer_value,
  57 @@ -221,6 +234,8 @@ static int qfprom_enable_fuse_blowing(co
  58
  59         return 0;
  60
  61 +err_reg_enable:
  62 +       regulator_disable(priv->vcc);
  63  err_clk_rate_set:
  64         clk_set_rate(priv->secclk, old->clk_rate);
  65  err_clk_prepared:
  66 @@ -320,6 +335,11 @@ static int qfprom_reg_read(void *context
  67         return 0;
  68  }
  69
  70 +static void qfprom_runtime_disable(void *data)
  71 +{
  72 +       pm_runtime_disable(data);
  73 +}
  74 +
  75  static const struct qfprom_soc_data qfprom_7_8_data = {
  76         .accel_value = 0xD10,
  77         .qfprom_blow_timer_value = 25,
  78 @@ -420,6 +440,11 @@ static int qfprom_probe(struct platform_
  79                         econfig.reg_write = qfprom_reg_write;
  80         }
  81
  82 +       pm_runtime_enable(dev);
  83 +       ret = devm_add_action_or_reset(dev, qfprom_runtime_disable, dev);
  84 +       if (ret)
  85 +               return ret;
  86 +
  87         nvmem = devm_nvmem_register(dev, &econfig);
  88
  89         return PTR_ERR_OR_ZERO(nvmem);