ARM: l2c: always enable low power modes
Always enable the L2C low power modes on L2C-310 R3P0 and newer parts.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
index 7e53214..6d8a057 100644
--- a/arch/arm/mm/cache-l2x0.c
+++ b/arch/arm/mm/cache-l2x0.c
@@ -654,6 +654,18 @@
}
}
+ /* r3p0 or later has power control register */
+ if (rev >= L310_CACHE_ID_RTL_R3P0) {
+ u32 power_ctrl;
+
+ l2c_write_sec(L310_DYNAMIC_CLK_GATING_EN | L310_STNDBY_MODE_EN,
+ base, L310_POWER_CTRL);
+ power_ctrl = readl_relaxed(base + L310_POWER_CTRL);
+ pr_info("L2C-310 dynamic clock gating %sabled, standby mode %sabled\n",
+ power_ctrl & L310_DYNAMIC_CLK_GATING_EN ? "en" : "dis",
+ power_ctrl & L310_STNDBY_MODE_EN ? "en" : "dis");
+ }
+
l2c_enable(base, aux, num_lock);
}