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drivers: nvmem: Fix voltage settings for QTI qfprom-efuse

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[ Upstream commit 9ec4f4b0e9 ]

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: 93b4e49f8c ("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>
This commit is contained in:
Ravi Kumar Bokka 2021-03-30 12:12:34 +01:00 committed by Greg Kroah-Hartman
parent 409ab5a9d8
commit 100a5c76e5
1 changed files with 21 additions and 0 deletions
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21
drivers/nvmem/qfprom.c
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@ -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");