cpuidle: tegra: Fix C7 idling state on Tegra114

Trusted Foundation firmware doesn't implement the do_idle call and in
this case suspending should fall back to the common suspend path. In order
to fix this issue we will unconditionally set the NOFLUSH_L2 mode via
firmware call, which is a NO-OP on Tegra30/124, and then proceed to the
C7 idling, like it was done by the older Tegra114 cpuidle driver.

Fixes: 14e086baca50 ("cpuidle: tegra: Squash Tegra114 driver into the common driver")
Cc: [email protected] # 5.7+
Reported-by: Anton Bambura <[email protected]> # TF701 T114
Tested-by: Anton Bambura <[email protected]> # TF701 T114
Tested-by: Matt Merhar <[email protected]> # Ouya T30
Tested-by: Peter Geis <[email protected]> # Ouya T30
Signed-off-by: Dmitry Osipenko <[email protected]>
Reviewed-by: Daniel Lezcano <[email protected]>
Signed-off-by: Daniel Lezcano <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

1 files changed, 6 insertions, 6 deletions

diff --git a/drivers/cpuidle/cpuidle-tegra.c b/drivers/cpuidle/cpuidle-tegra.c
index 191966dc8d02..29c5e83500d3 100644
--- a/drivers/cpuidle/cpuidle-tegra.c
+++ b/drivers/cpuidle/cpuidle-tegra.c
@@ -135,13 +135,13 @@ static int tegra_cpuidle_c7_enter(void)
 {
 	int err;
 
-	if (tegra_cpuidle_using_firmware()) {
-		err = call_firmware_op(prepare_idle, TF_PM_MODE_LP2_NOFLUSH_L2);
-		if (err)
-			return err;
+	err = call_firmware_op(prepare_idle, TF_PM_MODE_LP2_NOFLUSH_L2);
+	if (err && err != -ENOSYS)
+		return err;
 
-		return call_firmware_op(do_idle, 0);
-	}
+	err = call_firmware_op(do_idle, 0);
+	if (err != -ENOSYS)
+		return err;
 
 	return cpu_suspend(0, tegra30_pm_secondary_cpu_suspend);
 }