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>
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@ -32,6 +32,16 @@ static int r8a7740_pd_a3sp_suspend(void)
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return console_suspend_enabled ? 0 : -EBUSY;
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}
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static int r8a7740_pd_d4_suspend(void)
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{
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/*
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* The D4 domain contains the Coresight-ETM hardware block and
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* therefore it should only be turned off if the debug module is
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* not in use.
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*/
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return -EBUSY;
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}
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static struct rmobile_pm_domain r8a7740_pm_domains[] = {
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{
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.genpd.name = "A4LC",
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@ -39,6 +49,11 @@ static struct rmobile_pm_domain r8a7740_pm_domains[] = {
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}, {
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.genpd.name = "A4MP",
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.bit_shift = 2,
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}, {
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.genpd.name = "D4",
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.bit_shift = 3,
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.gov = &pm_domain_always_on_gov,
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.suspend = r8a7740_pd_d4_suspend,
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}, {
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.genpd.name = "A3RV",
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.bit_shift = 6,
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