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[2/5] OMAP4: enable double linefill on 4460

Message ID 1321929953-5956-3-git-send-email-mans.rullgard@linaro.org
State New
Headers show

Commit Message

Mans Rullgard Nov. 22, 2011, 2:45 a.m. UTC 
Re-enable the PL310 double linefill feature on 4460, disabled in 285d2c4,
without setting the "reserved" bit 25 of the prefetch control register.
Benchmarking shows no measurable difference with and without this bit
set.

Signed-off-by: Mans Rullgard <mans.rullgard@linaro.org>
---
 arch/arm/mach-omap2/omap4-common.c |   10 ++++------
 1 files changed, 4 insertions(+), 6 deletions(-)
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Patch

diff --git a/arch/arm/mach-omap2/omap4-common.c b/arch/arm/mach-omap2/omap4-common.c
index e0120d5..03b13e3 100644
--- a/arch/arm/mach-omap2/omap4-common.c
+++ b/arch/arm/mach-omap2/omap4-common.c
@@ -175,16 +175,14 @@  static int __init omap_l2_cache_init(void)
 
 	/* Setup POR Control register */
 	por_ctrl = readl_relaxed(l2cache_base + L2X0_PREFETCH_CTRL);
-#if 0
+
 	/*
 	 * Double linefill is available only on OMAP4460 L2X0.
-	 * Undocumented bit 25 is set for better performance.
 	 */
 	if (cpu_is_omap446x())
-		por_ctrl |= ((1 << L2X0_PREFETCH_DATA_PREFETCH_SHIFT) |
-			(1 << L2X0_PREFETCH_DOUBLE_LINEFILL_SHIFT) |
-			(1 << 25));
-#endif
+		por_ctrl |= (1 << L2X0_PREFETCH_DATA_PREFETCH_SHIFT) |
+			(1 << L2X0_PREFETCH_DOUBLE_LINEFILL_SHIFT);
+
 	if (cpu_is_omap446x() || (omap_rev() >= OMAP4430_REV_ES2_2)) {
 		por_ctrl |= L2X0_POR_OFFSET_VALUE;
 		omap_smc1(0x113, por_ctrl);