On 08/22/2012 10:11 PM, Arend van Spriel wrote:
> A quick search using google did not provide clues. Regardless if there
> is anything inserted the hang occurs.
your dmesg shows:
[ 241.908294] INFO: task modprobe:134 blocked for more than 120 seconds.
[ 241.908298] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 241.908301] modprobe D f48abbcc 0 134 98 0x00000000
[ 241.908307] f48abc3c 00000082 f59d0ebc f48abbcc c1289228 00000000 f4f3e480 c17b0380
[ 241.908313] c17b0380 c17b0380 1de51926 00000000 c17b0380 f59d5380 f4f3e480 f4853ed0
[ 241.908319] 00000000 00000001 f48abc28 00000000 f59d0eb0 f4df3131 c17abe80 00000003
[ 241.908326] Call Trace:
[ 241.908337] [<c1289228>] ? timerqueue_add+0x58/0xb0
[ 241.908345] [<c14ca103>] schedule+0x23/0x60
[ 241.908349] [<c14c8f5f>] schedule_hrtimeout_range_clock+0xaf/0x130
[ 241.908354] [<c105b4f0>] ? update_rmtp+0x80/0x80
[ 241.908359] [<c105c796>] ? hrtimer_start_range_ns+0x26/0x30
[ 241.908362] [<c14c8ff7>] schedule_hrtimeout_range+0x17/0x20
[ 241.908369] [<c10462c9>] usleep_range+0x39/0x40
[ 241.908384] [<f8030b39>] sdhci_do_start_signal_voltage_switch+0x59/0x150 [sdhci]
[ 241.908390] [<f8030c71>] sdhci_start_signal_voltage_switch+0x41/0x80 [sdhci]
[ 241.908401] [<f805ded8>] mmc_set_signal_voltage+0x58/0xb0 [mmc_core]
[ 241.908411] [<f805e105>] mmc_power_up+0x85/0xf0 [mmc_core]
[ 241.908420] [<f805e1a8>] mmc_start_host+0x38/0x50 [mmc_core]
[ 241.908430] [<f805f4b0>] mmc_add_host+0x50/0x90 [mmc_core]
[ 241.908436] [<f8031b37>] sdhci_add_host+0x837/0xbc0 [sdhci]
[ 241.908444] [<f807f10a>] sdhci_pci_probe+0x3fc/0x5f0 [sdhci_pci]
[ 241.908449] [<c14cac5f>] ? _raw_spin_lock_irqsave+0x2f/0x50
[ 241.908455] [<c12a5407>] local_pci_probe+0x47/0xb0
[ 241.908460] [<c12a6458>] pci_device_probe+0x68/0x90
[ 241.908467] [<c1337c48>] driver_probe_device+0x78/0x1f0
[ 241.908471] [<c12a5393>] ? pci_match_device+0xb3/0xc0
[ 241.908476] [<c1337e41>] __driver_attach+0x81/0x90
[ 241.908480] [<c1336613>] bus_for_each_dev+0x53/0x80
[ 241.908484] [<c1337abe>] driver_attach+0x1e/0x20
[ 241.908488] [<c1337dc0>] ? driver_probe_device+0x1f0/0x1f0
[ 241.908491] [<c1337512>] bus_add_driver+0xb2/0x230
[ 241.908495] [<c12a62d0>] ? pci_dev_put+0x20/0x20
[ 241.908499] [<c12a62d0>] ? pci_dev_put+0x20/0x20
[ 241.908502] [<c133841a>] driver_register+0x6a/0x140
[ 241.908509] [<c10be41b>] ? tracepoint_module_notify+0x12b/0x190
[ 241.908514] [<c12a6694>] __pci_register_driver+0x44/0xb0
[ 241.908522] [<f8086017>] sdhci_drv_init+0x17/0x19 [sdhci_pci]
[ 241.908526] [<c1001114>] do_one_initcall+0x34/0x170
[ 241.908532] [<f8086000>] ? 0xf8085fff
[ 241.908539] [<c1090c3e>] sys_init_module+0xee/0x1460
[ 241.908542] [<c108f620>] ? free_notes_attrs+0x50/0x50
[ 241.908549] [<f8073000>] ? 0xf8072fff
[ 241.908556] [<c14d175f>] sysenter_do_call+0x12/0x28
Looks like the usleep_range called in
sdhci_do_start_signal_voltage_switch blocked modprobe, maybe the timeout
never happens for whatever reason?
Can you please try the following patch:
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 8ac5246..30ce05d 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -1212,6 +1212,9 @@ static void mmc_power_up(struct mmc_host *host)
host->ios.timing = MMC_TIMING_LEGACY;
mmc_set_ios(host);
+ /* debug */
+ usleep_range(5000, 5500);
+
/* Set signal voltage to 3.3V */
mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, false);
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 9a11dc3..a181c46 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1616,7 +1616,8 @@ static int sdhci_do_start_signal_voltage_switch(struct sdhci_host *host,
* to 3.3V. If so, we change the voltage to 3.3V and return quickly.
*/
ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
- if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
+ if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330 &&
+ (ctrl & SDHCI_CTRL_VDD_180)) {
/* Set 1.8V Signal Enable in the Host Control2 register to 0 */
ctrl &= ~SDHCI_CTRL_VDD_180;
sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
The above code did 2 things:
1 calling usleep_range in another place to see what happened;
2 avoid setting 3.3v signalling voltage if host is already at 3.3v
signalling voltage.
Thanks,
Aaron
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