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power: reset: allow device to preserve memory on restart

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* Always perform a soft reset as this preserves memory contents,
  including pstore and other persistent memory.

Change-Id: Ideca44c9f38d2ebcd437ff289f8e036922eafcd2
Signed-off-by: Sorayukii <sorayukii69@gmail.com>
This commit is contained in:
Ethan Chen 2015-02-27 18:31:48 -08:00 • committed by Sorayukii
commit 95b03f8127
2 changed files with 13 additions and 0 deletions
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9
drivers/power/reset/Kconfig
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@ -124,6 +124,15 @@ config QCOM_DLOAD_MODE
make the kernel reboot on a kernel panic - that must be
enabled via another mechanism.
config QCOM_PRESERVE_MEM
bool "Always preserve memory on restart"
depends on POWER_RESET_QCOM
help
If crash to download mode is disabled and restart reason is null
the system will always perform a hard reset, which wipes out
persistent memory contents. Select this option to always perform
a soft reset that preserves memory contents.
config POWER_RESET_QNAP
bool "QNAP power-off driver"
depends on OF_GPIO && PLAT_ORION

4
drivers/power/reset/msm-poweroff.c
View file

@ -311,6 +311,10 @@ static void msm_restart_prepare(const char *cmd)
if (in_panic)
need_warm_reset = true;
#ifdef CONFIG_QCOM_PRESERVE_MEM
need_warm_reset = true;
#endif
/* Hard reset the PMIC unless memory contents must be maintained. */
if (force_warm_reboot || need_warm_reset)
qpnp_pon_system_pwr_off(PON_POWER_OFF_WARM_RESET);