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| author | Ravi Kumar Bokka <rbokka@codeaurora.org> | 2021-03-30 14:12:34 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-05-14 10:50:14 +0300 |
| commit | 100a5c76e5d2f781395372790443ba30135da8a4 (patch) | |
| tree | 0ff1a99031124ef616883b95764729236dbb6a6f /drivers/nvmem | |
| parent | 409ab5a9d8096d610225cff6324f6dcacda4ce7e (diff) | |
| download | linux-100a5c76e5d2f781395372790443ba30135da8a4.tar.xz | |
drivers: nvmem: Fix voltage settings for QTI qfprom-efuse
[ Upstream commit 9ec4f4b0e9fd3ad4b9a38bddb75b516ea09f4628 ]
QFPROM controller hardware requires 1.8V min for fuse blowing.
So, this change sets the voltage to 1.8V, required to blow the fuse
for qfprom-efuse controller.
To disable fuse blowing, we set the voltage to 0V since this may
be a shared rail and may be able to run at a lower rate when we're
not blowing fuses.
Fixes: 93b4e49f8c86 ("nvmem: qfprom: Add fuse blowing support")
Reported-by: Douglas Anderson <dianders@chromium.org>
Suggested-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Ravi Kumar Bokka <rbokka@codeaurora.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20210330111241.19401-4-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/nvmem')
| -rw-r--r-- | drivers/nvmem/qfprom.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/nvmem/qfprom.c b/drivers/nvmem/qfprom.c index 5e9e60e2e591..955b8b8c8238 100644 --- a/drivers/nvmem/qfprom.c +++ b/drivers/nvmem/qfprom.c @@ -104,6 +104,16 @@ static void qfprom_disable_fuse_blowing(const struct qfprom_priv *priv, { int ret; + /* + * This may be a shared rail and may be able to run at a lower rate + * when we're not blowing fuses. At the moment, the regulator framework + * applies voltage constraints even on disabled rails, so remove our + * constraints and allow the rail to be adjusted by other users. + */ + ret = regulator_set_voltage(priv->vcc, 0, INT_MAX); + if (ret) + dev_warn(priv->dev, "Failed to set 0 voltage (ignoring)\n"); + ret = regulator_disable(priv->vcc); if (ret) dev_warn(priv->dev, "Failed to disable regulator (ignoring)\n"); @@ -149,6 +159,17 @@ static int qfprom_enable_fuse_blowing(const struct qfprom_priv *priv, goto err_clk_prepared; } + /* + * Hardware requires 1.8V min for fuse blowing; this may be + * a rail shared do don't specify a max--regulator constraints + * will handle. + */ + ret = regulator_set_voltage(priv->vcc, 1800000, INT_MAX); + if (ret) { + dev_err(priv->dev, "Failed to set 1.8 voltage\n"); + goto err_clk_rate_set; + } + ret = regulator_enable(priv->vcc); if (ret) { dev_err(priv->dev, "Failed to enable regulator\n"); |