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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>
This commit is contained in:
Geert Uytterhoeven 2014-10-23 13:18:58 +02:00 committed by Simon Horman
parent 77192e1e25
commit 7e81f5434d
1 changed files with 15 additions and 0 deletions
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15
arch/arm/mach-shmobile/pm-r8a7740.c
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@ -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",
@ -39,6 +49,11 @@ 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,