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/Documentation/devicetree/bindings/arm/l2cc.txt b/Documentation/devicetree/bindings/arm/l2cc.txt
index e0dd400ecea65bd5ce2327dacc52be0cc4efb865..b513cb8196fefd3564c09ee8b6bc60285875185a 100644 (file)
--- a/Documentation/devicetree/bindings/arm/l2cc.txt
+++ b/Documentation/devicetree/bindings/arm/l2cc.txt
@@ -40,8 +40,6 @@ Optional properties:
 - arm,filter-ranges : <start length> Starting address and length of window to
   filter. Addresses in the filter window are directed to the M1 port. Other
   addresses will go to the M0 port.
-- arm,dynamic-clk-gating : Enables dynamic clock gating (PL310)
-- arm,standby-mode : Enables standby mode (PL310)
 - interrupts : 1 combined interrupt.
 - cache-id-part: cache id part number to be used if it is not present
   on hardware

diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
index 8c5219f6c10433f829146ef9f36be60d43b11bdb..333ef64873f97a782b9d7d331d15230240d39bba 100644 (file)
--- a/arch/arm/mm/cache-l2x0.c
+++ b/arch/arm/mm/cache-l2x0.c
@@ -695,6 +695,18 @@ static void __init l2c310_enable(void __iomem *base, u32 aux, unsigned num_lock)
                        1 + (prefetch & L310_PREFETCH_CTRL_OFFSET_MASK));
        }
 
+       /* 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);
 
        if (aux & L310_AUX_CTRL_FULL_LINE_ZERO) {
@@ -990,7 +1002,6 @@ static void __init l2c310_of_parse(const struct device_node *np,
        u32 data[3] = { 0, 0, 0 };
        u32 tag[3] = { 0, 0, 0 };
        u32 filter[2] = { 0, 0 };
-       u32 val;
 
        of_property_read_u32_array(np, "arm,tag-latency", tag, ARRAY_SIZE(tag));
        if (tag[0] && tag[1] && tag[2])
@@ -1017,15 +1028,6 @@ static void __init l2c310_of_parse(const struct device_node *np,
                writel_relaxed((filter[0] & ~(SZ_1M - 1)) | L310_ADDR_FILTER_EN,
                               l2x0_base + L310_ADDR_FILTER_START);
        }
-
-       val = 0;
-       if (of_property_read_bool(np, "arm,dynamic-clk-gating"))
-               val |= L310_DYNAMIC_CLK_GATING_EN;
-       if (of_property_read_bool(np, "arm,standby-mode"))
-               val |= L310_STNDBY_MODE_EN;
-
-       if (val)
-               l2c_write_sec(val, l2x0_base, L310_POWER_CTRL);
 }
 
 static const struct l2c_init_data of_l2c310_data __initconst = {