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| author | Geert Uytterhoeven <geert+renesas@glider.be> | 2014-10-23 13:18:58 +0200 |
|---|---|---|
| committer | Simon Horman <horms+renesas@verge.net.au> | 2014-10-28 08:40:17 +0900 |
| commit | 7e81f5434db5bbef3ac55d3f44f702566c0323c6 (patch) | |
| tree | 8c555387b2353fac9331b490ae606cb1186216da /arch/arm/mach-shmobile | |
| parent | 77192e1e25a57a519df30015b29c046bd6a769fc (diff) | |
| download | op-kernel-dev-7e81f5434db5bbef3ac55d3f44f702566c0323c6.zip op-kernel-dev-7e81f5434db5bbef3ac55d3f44f702566c0323c6.tar.gz | |
ARM: shmobile: r8a7740: Add D4 pm domain support
Add support for the D4 power domain.
This domain contains the Coresight-ETM hardware block.
As long as the ARM debug/perf code doesn't use resource management with
runtime PM support, the D4 power domain must be kept powered to avoid a
crash during resume from s2ram (dbg_cpu_pm_notify() calls
reset_ctrl_regs() unconditionally, causing an undefined instruction
oops).
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Diffstat (limited to 'arch/arm/mach-shmobile')
| -rw-r--r-- | arch/arm/mach-shmobile/pm-r8a7740.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/arm/mach-shmobile/pm-r8a7740.c b/arch/arm/mach-shmobile/pm-r8a7740.c index 081a4f9..8b1af2a 100644 --- a/arch/arm/mach-shmobile/pm-r8a7740.c +++ b/arch/arm/mach-shmobile/pm-r8a7740.c @@ -32,6 +32,16 @@ static int r8a7740_pd_a3sp_suspend(void) return console_suspend_enabled ? 0 : -EBUSY; } +static int r8a7740_pd_d4_suspend(void) +{ + /* + * The D4 domain contains the Coresight-ETM hardware block and + * therefore it should only be turned off if the debug module is + * not in use. + */ + return -EBUSY; +} + static struct rmobile_pm_domain r8a7740_pm_domains[] = { { .genpd.name = "A4LC", @@ -40,6 +50,11 @@ static struct rmobile_pm_domain r8a7740_pm_domains[] = { .genpd.name = "A4MP", .bit_shift = 2, }, { + .genpd.name = "D4", + .bit_shift = 3, + .gov = &pm_domain_always_on_gov, + .suspend = r8a7740_pd_d4_suspend, + }, { .genpd.name = "A3RV", .bit_shift = 6, }, { |
