Author: ian
Date: Tue May 6 14:26:24 2014
New Revision: 265447
URL: http://svnweb.freebsd.org/changeset/base/265447
Log:
Enable PL310 power-saving modes and tune the cache ram latencies for imx6.
Modified:
head/sys/arm/freescale/imx/imx6_pl310.c
Modified: head/sys/arm/freescale/imx/imx6_pl310.c
==============================================================================
--- head/sys/arm/freescale/imx/imx6_pl310.c Tue May 6 14:19:54 2014
(r265446)
+++ head/sys/arm/freescale/imx/imx6_pl310.c Tue May 6 14:26:24 2014
(r265447)
@@ -44,6 +44,19 @@ __FBSDID("$FreeBSD$");
void
platform_pl310_init(struct pl310_softc *sc)
{
+ uint32_t reg;
+
+ /*
+ * Enable power saving modes:
+ * - Dynamic Gating stops the clock when the controller is idle.
+ * - Standby stops the clock when the cores are in WFI mode.
+ */
+ reg = pl310_read4(sc, PL310_POWER_CTRL);
+ reg |= POWER_CTRL_ENABLE_GATING | POWER_CTRL_ENABLE_STANDBY;
+ pl310_write4(sc, PL310_POWER_CTRL, reg);
+
+ pl310_set_ram_latency(sc, PL310_TAG_RAM_CTRL, 4, 2, 3);
+ pl310_set_ram_latency(sc, PL310_DATA_RAM_CTRL, 4, 2, 3);
}
void
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