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[v2,30/48] soc/tegra: regulators: Fix locking up when voltage-spread is out of range

Message ID 20201217180638.22748-31-digetx@gmail.com
State Superseded
Headers show
Series [v2,01/48] dt-bindings: memory: tegra20: emc: Replace core regulator with power domain | expand

Commit Message

Dmitry Osipenko Dec. 17, 2020, 6:06 p.m. UTC
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
Tested-by: Peter Geis <pgwipeout@gmail.com>
Reported-by: Peter Geis <pgwipeout@gmail.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
 drivers/soc/tegra/regulators-tegra30.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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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