Commit 9ec4f4b0 authored by Ravi Kumar Bokka's avatar Ravi Kumar Bokka Committed by Greg Kroah-Hartman
Browse files

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



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: 93b4e49f ("nvmem: qfprom: Add fuse blowing support")
Reported-by: default avatarDouglas Anderson <dianders@chromium.org>
Suggested-by: default avatarDouglas Anderson <dianders@chromium.org>
Reviewed-by: default avatarDouglas Anderson <dianders@chromium.org>
Signed-off-by: default avatarRavi Kumar Bokka <rbokka@codeaurora.org>
Signed-off-by: default avatarSrinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20210330111241.19401-4-srinivas.kandagatla@linaro.org


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent e050f160

drivers/nvmem/qfprom.c

+21 −0
Original line number Diff line number Diff line
@@ -127,6 +127,16 @@ 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");
@@ -172,6 +182,17 @@ 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");