Commit 38743e41 authored Mar 25, 2020 by Dmitry Osipenko Committed by Thierry Reding May 06, 2020

ARM: tegra: Do not fully reinitialize L2 on resume



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>

parent 36dc3b1a

arch/arm/mach-tegra/pm.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -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;
		}

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