dvfs: tegra: Lower disabled VDD_GPU in one step

Scaled down GPU voltage is one step if GPU regulator is turned OFF
(kept 100mV decrements when regulator is ON).

Bug 1636322

Change-Id: I33a35fcfb9bb98cd1676fa9029952ee55cda435e
Signed-off-by: Alex Frid <afrid@nvidia.com>
Reviewed-on: http://git-master/r/731571
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Seshendra Gadagottu <sgadagottu@nvidia.com>
Reviewed-by: Yu-Huan Hsu <yhsu@nvidia.com>

diff --git a/drivers/platform/tegra/dvfs.c b/drivers/platform/tegra/dvfs.c
index db840e408865201ee02eb9f9826edd3c387b6589..e07fe7984c86eb559a8f1d1f3f683b83e27d2040 100644 (file)
--- a/drivers/platform/tegra/dvfs.c
+++ b/drivers/platform/tegra/dvfs.c
@@ -471,7 +471,8 @@ static int dvfs_rail_set_voltage(struct dvfs_rail *rail, int millivolts)
        jmp_to_zero = rail->jmp_to_zero &&
                        ((millivolts == 0) || (rail->millivolts == 0));
 
-       if (jmp_to_zero || rail->dfll_mode)
+       if (jmp_to_zero || rail->dfll_mode ||
+           (rail->in_band_pm && rail->stats.off))
                steps = 1;
        else
                steps = DIV_ROUND_UP(abs(millivolts - rail->millivolts), step);