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openwrt-xburst/target/linux/omap4/patches/000-hwmod_dont_wait.patch
jogo 06d197404b kernel: update linux 3.2 to 3.2.2 
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@29967 3c298f89-4303-0410-b956-a3cf2f4a3e73
2012-01-31 09:44:00 +00:00

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From: Benoit Cousson <b-cousson@ti.com>
Date: Sat, 17 Dec 2011 00:09:11 +0000 (-0800)
Subject: ARM: OMAP4: hwmod: Don't wait for the idle status if modulemode is not supported
X-Git-Url: http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Ftorvalds%2Flinux.git;a=commitdiff_plain;h=bfc141e3a515008d85e57af39c9faa4d2bbc65e0;hp=ddf536d0d7e1f0b63a681c970888730a4437414d
ARM: OMAP4: hwmod: Don't wait for the idle status if modulemode is not supported
If the module does not have any modulemode, the _disable_module function
will do nothing. There is then no point waiting for a idle status change.
It will remove the following warnings.
[ 0.331848] omap_hwmod: dmm: _wait_target_disable failed
[ 0.339935] omap_hwmod: emif_fw: _wait_target_disable failed
[ 0.348358] omap_hwmod: l3_main_1: _wait_target_disable failed
[ 0.356964] omap_hwmod: l3_main_2: _wait_target_disable failed
[ 0.365600] omap_hwmod: l4_abe: _wait_target_disable failed
[ 0.373931] omap_hwmod: l4_cfg: _wait_target_disable failed
[ 0.382263] omap_hwmod: l4_per: _wait_target_disable failed
[ 0.391113] omap_hwmod: l4_wkup: _wait_target_disable failed
[ 0.399536] omap_hwmod: dma_system: _wait_target_disable failed
[ 0.408325] omap_hwmod: dss_core: _wait_target_disable failed
[ 0.416839] omap_hwmod: dss_dispc: _wait_target_disable failed
[ 0.425445] omap_hwmod: dss_dsi1: _wait_target_disable failed
[ 0.433990] omap_hwmod: dss_dsi2: _wait_target_disable failed
[ 0.442504] omap_hwmod: dss_hdmi: _wait_target_disable failed
[ 0.451019] omap_hwmod: dss_rfbi: _wait_target_disable failed
[ 0.459564] omap_hwmod: dss_venc: _wait_target_disable failed
[ 0.489471] omap_hwmod: mailbox: _wait_target_disable failed
[ 0.505920] omap_hwmod: spinlock: _wait_target_disable failed
Note: For such module, the state is managed automatically by HW according
to clock domain transition. It is then not possible to wait for idle even
later in the _idle function since the status will change at clock domain
boundary.
Signed-off-by: Benoit Cousson <b-cousson@ti.com>
Cc: Paul Walmsley <paul@pwsan.com>
Cc: Rajendra Nayak <rnayak@ti.com>
[paul@pwsan.com: renamed fns to indicate that they are OMAP4-only; moved
_wait_target_disable() into _disable_module(), removing duplicate code]
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
---
--- a/arch/arm/mach-omap2/omap_hwmod.c
+++ b/arch/arm/mach-omap2/omap_hwmod.c
@@ -706,27 +706,65 @@ static void _enable_module(struct omap_h
}
/**
- * _disable_module - enable CLKCTRL modulemode on OMAP4
+ * _omap4_wait_target_disable - wait for a module to be disabled on OMAP4
+ * @oh: struct omap_hwmod *
+ *
+ * Wait for a module @oh to enter slave idle. Returns 0 if the module
+ * does not have an IDLEST bit or if the module successfully enters
+ * slave idle; otherwise, pass along the return value of the
+ * appropriate *_cm*_wait_module_idle() function.
+ */
+static int _omap4_wait_target_disable(struct omap_hwmod *oh)
+{
+ if (!cpu_is_omap44xx())
+ return 0;
+
+ if (!oh)
+ return -EINVAL;
+
+ if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
+ return 0;
+
+ if (oh->flags & HWMOD_NO_IDLEST)
+ return 0;
+
+ return omap4_cminst_wait_module_idle(oh->clkdm->prcm_partition,
+ oh->clkdm->cm_inst,
+ oh->clkdm->clkdm_offs,
+ oh->prcm.omap4.clkctrl_offs);
+}
+
+/**
+ * _omap4_disable_module - enable CLKCTRL modulemode on OMAP4
* @oh: struct omap_hwmod *
*
* Disable the PRCM module mode related to the hwmod @oh.
- * No return value.
+ * Return EINVAL if the modulemode is not supported and 0 in case of success.
*/
-static void _disable_module(struct omap_hwmod *oh)
+static int _omap4_disable_module(struct omap_hwmod *oh)
{
+ int v;
+
/* The module mode does not exist prior OMAP4 */
- if (cpu_is_omap24xx() || cpu_is_omap34xx())
- return;
+ if (!cpu_is_omap44xx())
+ return -EINVAL;
if (!oh->clkdm || !oh->prcm.omap4.modulemode)
- return;
+ return -EINVAL;
- pr_debug("omap_hwmod: %s: _disable_module\n", oh->name);
+ pr_debug("omap_hwmod: %s: %s\n", oh->name, __func__);
omap4_cminst_module_disable(oh->clkdm->prcm_partition,
oh->clkdm->cm_inst,
oh->clkdm->clkdm_offs,
oh->prcm.omap4.clkctrl_offs);
+
+ v = _omap4_wait_target_disable(oh);
+ if (v)
+ pr_warn("omap_hwmod: %s: _wait_target_disable failed\n",
+ oh->name);
+
+ return 0;
}
/**
@@ -1153,36 +1191,6 @@ static int _wait_target_ready(struct oma
}
/**
- * _wait_target_disable - wait for a module to be disabled
- * @oh: struct omap_hwmod *
- *
- * Wait for a module @oh to enter slave idle. Returns 0 if the module
- * does not have an IDLEST bit or if the module successfully enters
- * slave idle; otherwise, pass along the return value of the
- * appropriate *_cm*_wait_module_idle() function.
- */
-static int _wait_target_disable(struct omap_hwmod *oh)
-{
- /* TODO: For now just handle OMAP4+ */
- if (cpu_is_omap24xx() || cpu_is_omap34xx())
- return 0;
-
- if (!oh)
- return -EINVAL;
-
- if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
- return 0;
-
- if (oh->flags & HWMOD_NO_IDLEST)
- return 0;
-
- return omap4_cminst_wait_module_idle(oh->clkdm->prcm_partition,
- oh->clkdm->cm_inst,
- oh->clkdm->clkdm_offs,
- oh->prcm.omap4.clkctrl_offs);
-}
-
-/**
* _lookup_hardreset - fill register bit info for this hwmod/reset line
* @oh: struct omap_hwmod *
* @name: name of the reset line in the context of this hwmod
@@ -1524,8 +1532,6 @@ static int _enable(struct omap_hwmod *oh
*/
static int _idle(struct omap_hwmod *oh)
{
- int ret;
-
pr_debug("omap_hwmod: %s: idling\n", oh->name);
if (oh->_state != _HWMOD_STATE_ENABLED) {
@@ -1537,11 +1543,9 @@ static int _idle(struct omap_hwmod *oh)
if (oh->class->sysc)
_idle_sysc(oh);
_del_initiator_dep(oh, mpu_oh);
- _disable_module(oh);
- ret = _wait_target_disable(oh);
- if (ret)
- pr_warn("omap_hwmod: %s: _wait_target_disable failed\n",
- oh->name);
+
+ _omap4_disable_module(oh);
+
/*
* The module must be in idle mode before disabling any parents
* clocks. Otherwise, the parent clock might be disabled before
@@ -1642,11 +1646,7 @@ static int _shutdown(struct omap_hwmod *
if (oh->_state == _HWMOD_STATE_ENABLED) {
_del_initiator_dep(oh, mpu_oh);
/* XXX what about the other system initiators here? dma, dsp */
- _disable_module(oh);
- ret = _wait_target_disable(oh);
- if (ret)
- pr_warn("omap_hwmod: %s: _wait_target_disable failed\n",
- oh->name);
+ _omap4_disable_module(oh);
_disable_clocks(oh);
if (oh->clkdm)
clkdm_hwmod_disable(oh->clkdm, oh);
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