From 3a43b581dac1e5e70169dd6267bef4503ec3da21 Mon Sep 17 00:00:00 2001 From: Russell King Date: Fri, 28 Mar 2014 14:22:04 +0000 Subject: [PATCH] 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 --- arch/arm/mm/cache-l2x0.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c index 7e53214f7c36..6d8a0575a684 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); }