Commit ef85bb58 authored by Dmitry Osipenko's avatar Dmitry Osipenko Committed by Thierry Reding
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soc/tegra: regulators: Fix locking up when voltage-spread is out of range 



Fix voltage coupler lockup which happens when voltage-spread is out
of range due to a bug in the code. The max-spread requirement shall be
accounted when CPU regulator doesn't have consumers. This problem is
observed on Tegra30 Ouya game console once system-wide DVFS is enabled
in a device-tree.

Fixes: 78380743 ("soc/tegra: regulators: Add regulators coupler for Tegra30")
Cc: stable@vger.kernel.org
Reported-by: default avatarPeter Geis <pgwipeout@gmail.com>
Tested-by: Peter Geis <pgwipeout@gmail.com> # Ouya T30
Tested-by: Matt Merhar <mattmerhar@protonmail.com> # Ouya T30
Signed-off-by: default avatarDmitry Osipenko <digetx@gmail.com>
Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
parent 9d5e7c3e

drivers/soc/tegra/regulators-tegra30.c

+1 −1
Original line number Diff line number Diff line
@@ -178,7 +178,7 @@ static int tegra30_voltage_update(struct tegra_regulator_coupler *tegra, 
	 * survive the voltage drop if it's running on a higher frequency.

	 */

	if (!cpu_min_uV_consumers)

		cpu_min_uV = cpu_uV;

		cpu_min_uV = max(cpu_uV, cpu_min_uV);



	/*

	 * Bootloader shall set up voltages correctly, but if it