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authorRussell King <rmk+kernel@arm.linux.org.uk>2014-03-28 14:22:04 (GMT)
committerRussell King <rmk+kernel@arm.linux.org.uk>2014-05-29 23:48:54 (GMT)
commit3a43b581dac1e5e70169dd6267bef4503ec3da21 (patch)
tree8e20448569913001a4935ca25fd42946fa7ecd29 /arch/arm/mm
parent36bccb11a4ac7cc9d190c3062945f1c911a62801 (diff)
downloadlinux-3a43b581dac1e5e70169dd6267bef4503ec3da21.tar.xz
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>
Diffstat (limited to 'arch/arm/mm')
-rw-r--r--arch/arm/mm/cache-l2x0.c12
1 files changed, 12 insertions, 0 deletions
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 @@ static void __init l2c310_enable(void __iomem *base, u32 aux, unsigned num_lock)
}
}
+ /* 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);
}