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ARM: tegra: Do not fully reinitialize L2 on resume

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ASUS TF300T device may not work properly if firmware is asked to fully
re-initialize L2 cache after resume from LP2 suspend. The downstream
kernel of TF300T uses different opcode to enable cache after resuming
from LP2, this opcode also works fine on Nexus 7 and Ouya devices.
Supposedly, this may be needed by an older firmware versions.

Reported-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Tested-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Tested-by: Jasper Korten <jja2000@gmail.com>
Tested-by: David Heidelberg <david@ixit.cz>
Tested-by: Peter Geis <pgwipeout@gmail.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Dmitry Osipenko 2020-03-25 01:43:34 +03:00 committed by Thierry Reding
parent 36dc3b1a7e
commit 38743e414e
1 changed files with 4 additions and 0 deletions
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4
arch/arm/mach-tegra/pm.c
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@ -216,6 +216,8 @@ int tegra_pm_enter_lp2(void)
restore_cpu_complex();
cpu_cluster_pm_exit();
call_firmware_op(prepare_idle, TF_PM_MODE_NONE);
return err;
}
@ -391,6 +393,8 @@ static int tegra_suspend_enter(suspend_state_t state)
local_fiq_enable();
call_firmware_op(prepare_idle, TF_PM_MODE_NONE);
return 0;
}