Date: Tue, 6 May 2014 14:26:24 +0000 (UTC) From: Ian Lepore <ian@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r265447 - head/sys/arm/freescale/imx Message-ID: <201405061426.s46EQOEb041308@svn.freebsd.org>
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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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