I've run across a semi-consistent (~15%) hang on Logic's omap3530 LV SOM
running a 2.6.28-rc8 omap kernel where it dies in twl_mmc_set_voltage().
Adding in printk's perturbs the frequency of failure, but it
consistently dies on the same call. I've added the following
printk's(and others) in twl_mmc_set_voltage() to straddle the failure:
printk("%s: dev_grp_val 0x%x vmmc_dev_grp 0x%x\n", __FUNCTION__,
dev_grp_val, c->twl_vmmc_dev_grp);
ret = twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER,
dev_grp_val, c->twl_vmmc_dev_grp);
printk("%s:%d ret %d\n", __FUNCTION__, __LINE__, ret);
if (ret)
return ret;
When it dies, I consistently see the first printk, but not the 2nd after
returning from twl4030_i2c_write_u8(). The log (when it dies) looks
like:
cpuidle: using governor ladder
cpuidle: using governor menu
mmci-omap-hs mmci-omap-hs.0: mmc_fclk: enabled
mmci-omap-hs mmci-omap-hs.0: Failed to get debounce clock
omap_mmc_probe:1180
twl_mmc1_set_power: slot 0 power_on 0 vdd 0
twl_mmc1_set_power:294
twl_mmc_set_voltage: vdd 0
twl_mmc_set_voltage: dev_grp_val 0x0 vmmc_dev_grp 0x27
What's really weird is that Sysrq won't tell me anything after its died.
As a result I'm really stumped on trying to figure out what's gone
wrong.
Has anyone stumbled across this before or have any ideas on how I can
debug this further? I'm currently using the CodeSourcery 2009q1-203
compiler.
Thanks in advance!
--
Peter Barada <[email protected]>
Logic Product Development, Inc.
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