Some IP blocks might not be using/controlling more than one
reset line, this check loosens the restriction to fully use
hwmod framework for those drivers.
E.g.: ipu has reset lines: mmu_cache, cpu0 and cpu1.
- As of now cpu1 is not used and hence (with previous check) the
IP block isn't fully enabled by hwmod code.
- Usually ipu and dsp processors configure their mmu module first
and then enable the processors, this involves:
* Deasserting mmu reset line, and enabling the module.
* Deasserting cpu0 reset line, and enabling the processor.
The ones portrayed in this example are controlled through
rproc_fw_boot in drivers/remoteproc/remoteproc_core.c
While at it, prevent _omap4_module_disable if all the hardreset
lines on an IP block are not under reset.
This will allow the driver to:
a. Deassert the reset line.
b. Enable the hwmod through runtime PM default callbacks.
c. Do its usecase.
d. Disable hwmod through runtime PM.
e. Assert the reset line.
Signed-off-by: Omar Ramirez Luna <omar.l...@linaro.org>
---
arch/arm/mach-omap2/omap_hwmod.c | 37 ++++++++++++++++++++++---------------
1 file changed, 22 insertions(+), 15 deletions(-)
diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c
index 6ca8e51..eaedc33 100644
--- a/arch/arm/mach-omap2/omap_hwmod.c
+++ b/arch/arm/mach-omap2/omap_hwmod.c
@@ -1558,25 +1558,28 @@ static int _read_hardreset(struct omap_hwmod *oh, const
char *name)
}
/**
- * _are_any_hardreset_lines_asserted - return true if part of @oh is hard-reset
+ * _are_all_hardreset_lines_asserted - return true if the @oh is hard-reset
* @oh: struct omap_hwmod *
*
- * If any hardreset line associated with @oh is asserted, then return true.
- * Otherwise, if @oh has no hardreset lines associated with it, or if
- * no hardreset lines associated with @oh are asserted, then return false.
+ * If all hardreset lines associated with @oh are asserted, then return true.
+ * Otherwise, if part of @oh is out hardreset or if no hardreset lines
+ * associated with @oh are asserted, then return false.
* This function is used to avoid executing some parts of the IP block
- * enable/disable sequence if a hardreset line is set.
+ * enable/disable sequence if its hardreset line is set.
*/
-static bool _are_any_hardreset_lines_asserted(struct omap_hwmod *oh)
+static bool _are_all_hardreset_lines_asserted(struct omap_hwmod *oh)
{
- int i;
+ int i, rst_cnt = 0;
if (oh->rst_lines_cnt == 0)
return false;
for (i = 0; i < oh->rst_lines_cnt; i++)
if (_read_hardreset(oh, oh->rst_lines[i].name) > 0)
- return true;
+ rst_cnt++;
+
+ if (oh->rst_lines_cnt == rst_cnt)
+ return true;
return false;
}
@@ -1595,6 +1598,13 @@ static int _omap4_disable_module(struct omap_hwmod *oh)
if (!oh->clkdm || !oh->prcm.omap4.modulemode)
return -EINVAL;
+ /*
+ * Since integration code might still be doing something, only
+ * disable if all lines are under hardreset.
+ */
+ if (!_are_all_hardreset_lines_asserted(oh))
+ return 0;
+
pr_debug("omap_hwmod: %s: %s\n", oh->name, __func__);
omap4_cminst_module_disable(oh->clkdm->prcm_partition,
@@ -1602,9 +1612,6 @@ static int _omap4_disable_module(struct omap_hwmod *oh)
oh->clkdm->clkdm_offs,
oh->prcm.omap4.clkctrl_offs);
- if (_are_any_hardreset_lines_asserted(oh))
- return 0;
-
v = _omap4_wait_target_disable(oh);
if (v)
pr_warn("omap_hwmod: %s: _wait_target_disable failed\n",
@@ -1830,7 +1837,7 @@ static int _enable(struct omap_hwmod *oh)
}
/*
- * If an IP block contains HW reset lines and any of them are
+ * If an IP block contains HW reset lines and all of them are
* asserted, we let integration code associated with that
* block handle the enable. We've received very little
* information on what those driver authors need, and until
@@ -1838,7 +1845,7 @@ static int _enable(struct omap_hwmod *oh)
* posted to the public lists, this is probably the best we
* can do.
*/
- if (_are_any_hardreset_lines_asserted(oh))
+ if (_are_all_hardreset_lines_asserted(oh))
return 0;
/* Mux pins for device runtime if populated */
@@ -1918,7 +1925,7 @@ static int _idle(struct omap_hwmod *oh)
return -EINVAL;
}
- if (_are_any_hardreset_lines_asserted(oh))
+ if (_are_all_hardreset_lines_asserted(oh))
return 0;
if (oh->class->sysc)
@@ -2006,7 +2013,7 @@ static int _shutdown(struct omap_hwmod *oh)
return -EINVAL;
}
- if (_are_any_hardreset_lines_asserted(oh))
+ if (_are_all_hardreset_lines_asserted(oh))
return 0;
pr_debug("omap_hwmod: %s: disabling\n", oh->name);
--
1.7.9.5
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