From 31f62866c578b3d47ef7810b336e9e193b90167f Mon Sep 17 00:00:00 2001 From: Benoit Cousson Date: Fri, 1 Jul 2011 22:54:05 +0200 Subject: [PATCH] OMAP2+: hwmod: Fix the HW reset management The HW reset must be de-assert after the clocks are enabled but before waiting for the target to be ready. Otherwise the reset might not work properly since the clock is not running to proceed the reset. De-assert the reset after _enable_clocks and before _wait_target_ready. Re-assert it only when the clocks are disabled. Signed-off-by: Benoit Cousson Signed-off-by: Paul Walmsley --- arch/arm/mach-omap2/omap_hwmod.c | 32 ++++++++++++++++---------------- 1 file changed, 16 insertions(+), 16 deletions(-) diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c index f4014179d601..df91bb1dc972 100644 --- a/arch/arm/mach-omap2/omap_hwmod.c +++ b/arch/arm/mach-omap2/omap_hwmod.c @@ -1250,15 +1250,6 @@ static int _enable(struct omap_hwmod *oh) pr_debug("omap_hwmod: %s: enabling\n", oh->name); - /* - * If an IP contains only one HW reset line, then de-assert it in order - * to allow to enable the clocks. Otherwise the PRCM will return - * Intransition status, and the init will failed. - */ - if ((oh->_state == _HWMOD_STATE_INITIALIZED || - oh->_state == _HWMOD_STATE_DISABLED) && oh->rst_lines_cnt == 1) - _deassert_hardreset(oh, oh->rst_lines[0].name); - /* Mux pins for device runtime if populated */ if (oh->mux && (!oh->mux->enabled || ((oh->_state == _HWMOD_STATE_IDLE) && @@ -1268,6 +1259,15 @@ static int _enable(struct omap_hwmod *oh) _add_initiator_dep(oh, mpu_oh); _enable_clocks(oh); + /* + * If an IP contains only one HW reset line, then de-assert it in order + * to allow the module state transition. Otherwise the PRCM will return + * Intransition status, and the init will failed. + */ + if ((oh->_state == _HWMOD_STATE_INITIALIZED || + oh->_state == _HWMOD_STATE_DISABLED) && oh->rst_lines_cnt == 1) + _deassert_hardreset(oh, oh->rst_lines[0].name); + r = _wait_target_ready(oh); if (!r) { oh->_state = _HWMOD_STATE_ENABLED; @@ -1396,13 +1396,6 @@ static int _shutdown(struct omap_hwmod *oh) _shutdown_sysc(oh); } - /* - * If an IP contains only one HW reset line, then assert it - * before disabling the clocks and shutting down the IP. - */ - if (oh->rst_lines_cnt == 1) - _assert_hardreset(oh, oh->rst_lines[0].name); - /* clocks and deps are already disabled in idle */ if (oh->_state == _HWMOD_STATE_ENABLED) { _del_initiator_dep(oh, mpu_oh); @@ -1411,6 +1404,13 @@ static int _shutdown(struct omap_hwmod *oh) } /* XXX Should this code also force-disable the optional clocks? */ + /* + * If an IP contains only one HW reset line, then assert it + * after disabling the clocks and before shutting down the IP. + */ + if (oh->rst_lines_cnt == 1) + _assert_hardreset(oh, oh->rst_lines[0].name); + /* Mux pins to safe mode or use populated off mode values */ if (oh->mux) omap_hwmod_mux(oh->mux, _HWMOD_STATE_DISABLED);