diff options
| author | Geert Uytterhoeven <geert+renesas@glider.be> | 2017-09-29 15:17:18 +0300 |
|---|---|---|
| committer | Geert Uytterhoeven <geert+renesas@glider.be> | 2017-10-20 12:37:43 +0300 |
| commit | 8843797df383ac7ed7cf4f87cc18a4ec6d929b60 (patch) | |
| tree | e222667cdfac734913731ece272a7665f30dbed3 /drivers/pinctrl/sh-pfc/sh_pfc.h | |
| parent | 3870a6f6ac255340767de64e71fbbfc54eb39403 (diff) | |
| download | linux-8843797df383ac7ed7cf4f87cc18a4ec6d929b60.tar.xz | |
pinctrl: sh-pfc: Save/restore registers for PSCI system suspend
During PSCI system suspend, R-Car Gen3 SoCs are powered down, and their
pinctrl register state is lost. Note that as the boot loader skips most
initialization after system resume, pinctrl register state differs from
the state encountered during normal system boot, too.
To fix this, save all GPIO and peripheral function select, module
select, drive strength control, bias, and other I/O control registers
during system suspend, and restore them during system resume.
Note that to avoid overhead on platforms not needing it, the
suspend/resume code has a build time dependency on sleep and PSCI
support, and a runtime dependency on PSCI.
Inspired by a patch in the BSP by Hien Dang.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Diffstat (limited to 'drivers/pinctrl/sh-pfc/sh_pfc.h')
| -rw-r--r-- | drivers/pinctrl/sh-pfc/sh_pfc.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/pinctrl/sh-pfc/sh_pfc.h b/drivers/pinctrl/sh-pfc/sh_pfc.h index b9bb56c91b6f..213108a058fe 100644 --- a/drivers/pinctrl/sh-pfc/sh_pfc.h +++ b/drivers/pinctrl/sh-pfc/sh_pfc.h @@ -222,6 +222,7 @@ struct sh_pfc { unsigned int nr_gpio_pins; struct sh_pfc_chip *gpio; + u32 *saved_regs; }; struct sh_pfc_soc_operations { |