From ef85bb582c41524e9e68dfdbde48e519dac4ab3d Mon Sep 17 00:00:00 2001 From: Dmitry Osipenko Date: Tue, 2 Mar 2021 16:18:00 +0300 Subject: 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: 783807436f36 ("soc/tegra: regulators: Add regulators coupler for Tegra30") Cc: stable@vger.kernel.org Reported-by: Peter Geis Tested-by: Peter Geis # Ouya T30 Tested-by: Matt Merhar # Ouya T30 Signed-off-by: Dmitry Osipenko Signed-off-by: Thierry Reding --- drivers/soc/tegra/regulators-tegra30.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/soc/tegra') diff --git a/drivers/soc/tegra/regulators-tegra30.c b/drivers/soc/tegra/regulators-tegra30.c index 7f21f31de09d..0e776b20f625 100644 --- a/drivers/soc/tegra/regulators-tegra30.c +++ b/drivers/soc/tegra/regulators-tegra30.c @@ -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 -- cgit v1.2.3