From: Dmitry Baryshkov dmitry.baryshkov@linaro.org
commit 98e48cd9283dbac0e1445ee780889f10b3d1db6a upstream.
For the boot-on/always-on regulators the set_machine_constrainst() is called before resolving rdev->supply. Thus the code would try to enable rdev before enabling supplying regulator. Enforce resolving supply regulator before enabling rdev.
Fixes: aea6cb99703e ("regulator: resolve supply after creating regulator") Signed-off-by: Dmitry Baryshkov dmitry.baryshkov@linaro.org Link: https://lore.kernel.org/r/20210519221224.2868496-1-dmitry.baryshkov@linaro.o... Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/regulator/core.c | 6 ++++++ 1 file changed, 6 insertions(+)
--- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -1081,6 +1081,12 @@ static int set_machine_constraints(struc * and we have control then make sure it is enabled. */ if (rdev->constraints->always_on || rdev->constraints->boot_on) { + /* If we want to enable this regulator, make sure that we know + * the supplying regulator. + */ + if (rdev->supply_name && !rdev->supply) + return -EPROBE_DEFER; + ret = _regulator_do_enable(rdev); if (ret < 0 && ret != -EINVAL) { rdev_err(rdev, "failed to enable\n");