Hi Paul,
On Wednesday 02 March 2011 03:03 AM, Paul Walmsley wrote:
Hi Santosh
On Tue, 1 Mar 2011, Santosh Shilimkar wrote:
-----Original Message-----
From: linux-omap-ow...@vger.kernel.org [mailto:linux-omap-
ow...@vger.kernel.org] On Behalf Of Paul Walmsley
Sent: Saturday, February 26, 2011 5:56 AM
To: linux-omap@vger.kernel.org
Subject: Integration branch base switchover to Tony's omap-for-linus
branch
Hi,
this is a quick note for anyone using the integration-2.6.39 branch
on
git://git.pwsan.com/linux-2.6: I've switched the base over from
mainline to Tony's omap-for-linus branch.
I observed an issue when integrated omap-for-linus + your branch
+ OMAP4 PM patches. After debugging this with Rajendra, it seems
that issue is seen only when static dependency between MPU
and L4PER clock-domain is cleared _and_ L4_PER clock-domain
is programmed to HW_SUP.
Since the issue is observed with only I2C IP block from L4_PER
and none of the other modules are affected, the suspect is I2C
IP block. The hardware team is investigating this issue.
So for now, to avoid this abort, there are two options
- Remove HW_SUP from L4_PER CD
- Keep MPU<->L4_PER static dependency.
We tried both the options and they seems to work.
Which one you prefer till we have hardware root-cause
of this issue?
Between the two alternatives you suggested, I'd prefer #1; but could you
try forcing the I2C blocks to use software idle control instead and see if
that fixes it without the need to change the clockdomains file? Sample
patch follows. If that fixes it, it might be useful to know whether it is
the HWMOD_SWSUP_SIDLE flag or HWMOD_NO_OCP_AUTOIDLE flag or both that is
required.
Yes, it does seem to fix the issue also, and its the HWMOD_SWSUP_SIDLE
that apparently makes a difference. HWMOD_NO_OCP_AUTOIDLE alone does
not fix it.
Also some more testing showed up a lockup in suspend on OMAP4 which I
could narrow down to a similar case with GPT1. Either keeping the
staticdep between MPU and L4_WKUP _or_ forcing GPT1 to use software
idle control seems to help.
regards,
Rajendra
- Paul
From: Paul Walmsley<p...@pwsan.com>
Date: Tue, 1 Mar 2011 14:11:31 -0700
Subject: [PATCH] OMAP4: I2C hwmods: Test patch to attempt to narrow down crashes
Put the I2C IP blocks into software-controlled idle to attempt to narrow down
some crashes.
---
arch/arm/mach-omap2/omap_hwmod_44xx_data.c | 8 ++++----
1 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/arch/arm/mach-omap2/omap_hwmod_44xx_data.c
b/arch/arm/mach-omap2/omap_hwmod_44xx_data.c
index 79a8601..8415b97 100644
--- a/arch/arm/mach-omap2/omap_hwmod_44xx_data.c
+++ b/arch/arm/mach-omap2/omap_hwmod_44xx_data.c
@@ -2124,7 +2124,7 @@ static struct omap_hwmod_ocp_if *omap44xx_i2c1_slaves[] =
{
static struct omap_hwmod omap44xx_i2c1_hwmod = {
.name = "i2c1",
.class =&omap44xx_i2c_hwmod_class,
- .flags = HWMOD_INIT_NO_RESET,
+ .flags = HWMOD_INIT_NO_RESET | HWMOD_SWSUP_SIDLE |
HWMOD_NO_OCP_AUTOIDLE,
.mpu_irqs = omap44xx_i2c1_irqs,
.mpu_irqs_cnt = ARRAY_SIZE(omap44xx_i2c1_irqs),
.sdma_reqs = omap44xx_i2c1_sdma_reqs,
@@ -2177,7 +2177,7 @@ static struct omap_hwmod_ocp_if *omap44xx_i2c2_slaves[] =
{
static struct omap_hwmod omap44xx_i2c2_hwmod = {
.name = "i2c2",
.class =&omap44xx_i2c_hwmod_class,
- .flags = HWMOD_INIT_NO_RESET,
+ .flags = HWMOD_INIT_NO_RESET | HWMOD_SWSUP_SIDLE |
HWMOD_NO_OCP_AUTOIDLE,
.mpu_irqs = omap44xx_i2c2_irqs,
.mpu_irqs_cnt = ARRAY_SIZE(omap44xx_i2c2_irqs),
.sdma_reqs = omap44xx_i2c2_sdma_reqs,
@@ -2230,7 +2230,7 @@ static struct omap_hwmod_ocp_if *omap44xx_i2c3_slaves[] =
{
static struct omap_hwmod omap44xx_i2c3_hwmod = {
.name = "i2c3",
.class =&omap44xx_i2c_hwmod_class,
- .flags = HWMOD_INIT_NO_RESET,
+ .flags = HWMOD_INIT_NO_RESET | HWMOD_SWSUP_SIDLE |
HWMOD_NO_OCP_AUTOIDLE,
.mpu_irqs = omap44xx_i2c3_irqs,
.mpu_irqs_cnt = ARRAY_SIZE(omap44xx_i2c3_irqs),
.sdma_reqs = omap44xx_i2c3_sdma_reqs,
@@ -2283,7 +2283,7 @@ static struct omap_hwmod_ocp_if *omap44xx_i2c4_slaves[] =
{
static struct omap_hwmod omap44xx_i2c4_hwmod = {
.name = "i2c4",
.class =&omap44xx_i2c_hwmod_class,
- .flags = HWMOD_INIT_NO_RESET,
+ .flags = HWMOD_INIT_NO_RESET | HWMOD_SWSUP_SIDLE |
HWMOD_NO_OCP_AUTOIDLE,
.mpu_irqs = omap44xx_i2c4_irqs,
.mpu_irqs_cnt = ARRAY_SIZE(omap44xx_i2c4_irqs),
.sdma_reqs = omap44xx_i2c4_sdma_reqs,
--
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