Always enable the L2C low power modes on L2C-310 R3P0 and newer parts.
Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
---
Documentation/devicetree/bindings/arm/l2cc.txt | 2 --
arch/arm/mm/cache-l2x0.c | 22 ++++++++++++----------
2 files changed, 12 insertions(+), 12 deletions(-)
diff --git a/Documentation/devicetree/bindings/arm/l2cc.txt b/Documentation/devicetree/bindings/arm/l2cc.txt
index e0dd400ecea6..b513cb8196fe 100644
--- a/Documentation/devicetree/bindings/arm/l2cc.txt
+++ b/Documentation/devicetree/bindings/arm/l2cc.txt
@@ -40,8 +40,6 @@ implementations of the L2 cache controller with compatible programming models.
- 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 700a66260f94..b1f103d402be 100644
--- a/arch/arm/mm/cache-l2x0.c
+++ b/arch/arm/mm/cache-l2x0.c
@@ -752,6 +752,18 @@ 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) {
@@ -1033,7 +1045,6 @@ 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])
@@ -1060,15 +1071,6 @@ 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 = {
--
1.8.3.1
--
To unsubscribe from this list: send the line "unsubscribe linux-doc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
