Hi all,
Hi all,
We are porting existing OMAP HSMMC driver (omap_hsmmc.c) to an upcoming SOC. The HSMMC IP is same as the one found in DM814x which uses the IP CD pins to detect MMC card insertion/removal rather than using gpio pins.
When testing the driver with SanDisk 16GB SDHC Card (SanDisk Extreme HD Video 16GB 20Mb/s), we have observed that the card insertion/removal is not detected.
The PSTATE variable CINS do not change across card insertion/removal. However we do see a change in the CDPL bit in SD_PSTATE register.
I have attached the logs[1] on Linux v3.1-rc8 that I get for reference.
Also, I tested the same on Linux v3.1-rc3 and found some interesting point. The card insertion/removal is detected when I read the "regs"parameter from omap hsmmc driver debugfs feature. As soon as I read the regs parameter, I get card insertion/removal messages on console. However the sad part is that the same procedure doesn't work on v3.1-rc8.
I have attached the logs[2] on Linux v3.1-rc3 that I get for reference.
Can someone guide on what could be the probable cause.
Thanks in advance
Regards
Gururaja
[1]Logs
[ 0.000000] Linux version 3.1.0-rc8-51950-g2886ac9-dirty (ghebbar@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx) (gcc version 4.3.3 (GCC) ) #49 Wed Oct 12 15:31:19 IST 2011
[ 0.000000] CPU: ARMv7 Processor [413fc082] revision 2 (ARMv7), cr=10c53c7f
[ 0.000000] CPU: VIPT nonaliasing data cache, VIPT aliasing instruction cache
[ 0.000000] Machine: am335xevm
[ 0.000000] Memory policy: ECC disabled, Data cache writeback
...
...
[ 2.032665] mmc0: new SD card at address aaaa
[ 2.037800] mmcblk0: mmc0:aaaa SD02G 1.84 GiB
[ 2.045124] mmcblk0: p1
...
...
root@arago-armv7:~#mkdir -p /debugfs
root@arago-armv7:~#mount -t debugfs debugfs /debugfs
root@arago-armv7:~#cd /debugfs/mmc0/
1. With card, no write-protect
root@arago-armv7:/debugfs/mmc0# cat clock
25000000
root@arago-armv7:/debugfs/mmc0# cat ios
clock: 25000000 Hz
vdd: 20 (3.2 ~ 3.3 V)
bus mode: 2 (push-pull)
chip select: 0 (don't care)
power mode: 2 (on)
bus width: 2 (4 bits)
timing spec: 0 (legacy)
root@arago-armv7:/debugfs/mmc0# cat regs
mmc0:
enabled: 0
dpm_state: 0
nesting_cnt: 0
ctx_loss: 0:0
regs:
SYSCONFIG: 0x00002015
CON: 0x00000700
HCTL: 0x00000d02
SYSCTL: 0x00090107
IE: 0x000000c0
ISE: 0x000000c0
CAPA: 0x06e10080
STAT: 0x00000000
PSTATE: 0x01ff0000
2. Without card
root@arago-armv7:/debugfs/mmc0# cat clock
25000000
root@arago-armv7:/debugfs/mmc0# cat ios
clock: 25000000 Hz
vdd: 20 (3.2 ~ 3.3 V)
bus mode: 2 (push-pull)
chip select: 0 (don't care)
power mode: 2 (on)
bus width: 2 (4 bits)
timing spec: 0 (legacy)
root@arago-armv7:/debugfs/mmc0# cat regs
mmc0:
enabled: 0
dpm_state: 0
nesting_cnt: 0
ctx_loss: 0:0
regs:
SYSCONFIG: 0x00002015
CON: 0x00000700
HCTL: 0x00000d02
SYSCTL: 0x00090107
IE: 0x000000c0
ISE: 0x000000c0
CAPA: 0x06e10080
STAT: 0x00000000
PSTATE: 0x01fb0000
[2]Logs
Uncompressing Linux... done, booting the kernel.
[ 0.000000] Linux version 3.1.0-rc3-50824-gbd42c3b-dirty (user@linux-server) (gcc version 4.3.3 (GCC) ) #7 SMP Thu Oct 13 15:37:58 IST 2011
[ 0.000000] CPU: ARMv7 Processor [413fc082] revision 2 (ARMv7), cr=10c53c7f
[ 0.000000] CPU: VIPT nonaliasing data cache, VIPT aliasing instruction cache
1. 1st case. Card is present while booting kernel.
Removal of card is not detected. Since omap hsmmc driver supports debugfs, I mounted debugfs.
Inside mmc0 entry, I read "regs" parameter. As soon as I read, card removal got detected and I saw the log.
Same for Card insertion also. Initially no response on console. As soon as I read the "regs" parameter, I was able to get console output and the card was mounted
2. 2nd case. Card is not present while booting kernel.
Upon booting
...
...
[ 2.091839] Driver for 1-wire Dallas network protocol.
[ 2.101173] OMAP Watchdog Timer Rev 0x01: initial timeout 60 sec
[ 2.113554] omap_hsmmc omap_hsmmc.0: omap_hsmmc_runtime_resume : 2416 - enabled --> all these added for debugging
[ 2.123089] omap_hsmmc omap_hsmmc.0: omap_hsmmc_runtime_suspend : 2405 - disabled
[ 2.131592] omap_hsmmc omap_hsmmc.0: omap_hsmmc_enable_fclk : 1890 - enabled fclk
[ 2.139781] omap_hsmmc omap_hsmmc.0: omap_hsmmc_runtime_resume : 2416 - enabled
[ 2.147576] omap_hsmmc omap_hsmmc.0: omap_hsmmc_disable_fclk : 1899 - disabled fclk
[ 2.158232] usbcore: registered new interface driver usbhid
[ 2.164218] usbhid: USB HID core driver
...
...
Card insertion is not detected. After card insertion waited for 1 min. no console output
root@arago-armv7:~# mkdir -p /debugfs
root@arago-armv7:~# mount -t debugfs debugfs /debugfs
root@arago-armv7:~# /debugfs/mmc0/
-sh: /debugfs/mmc0/: Permission denied
root@arago-armv7:~# cd /debugfs/mmc0/
root@arago-armv7:/debugfs/mmc0#
root@arago-armv7:/debugfs/mmc0# dmesg -c
root@arago-armv7:/debugfs/mmc0# cat regs
[ 321.314130] omap_hsmmc omap_hsmmc.0: omap_hsmmc_runtime_resume : 2416 - enabled
[ 321.323063] omap_hsmmc omap_hsmmc.0: omap_hsmmc_enable_fclk : 1890 - enabled fclk
[ 321.330970] omap_hsmmc omap_hsmmc.0: omap_hsmmc_disable_fclk : 1899 - disabled fclk
mmc0:
enabled: 0
dpm_state: 0
nesting_cnt: 0
ctx_loss: 0:0
regs:
SYSCONFIG: 0x00002015
CON: 0x00000701
HCTL: 0x00000d00
SYSCTL: 0x000e0007
IE: 0x000000c0
ISE: 0x000000c0
CAPA: 0x06e10080
STAT: 0x00000000 --> all these added for debugging
PSTATE: 0x01ff0000
root@arago-armv7:/debugfs/mmc0# [ 321.432397] omap_hsmmc omap_hsmmc.0: omap_hsmmc_runtime_suspend : 2405 - disabled
[ 321.533229] omap_hsmmc omap_hsmmc.0: omap_hsmmc_enable_fclk : 1890 - enabled fclk
[ 321.541189] omap_hsmmc omap_hsmmc.0: omap_hsmmc_runtime_resume : 2416 - enabled
[ 321.549012] omap_hsmmc omap_hsmmc.0: omap_hsmmc_disable_fclk : 1899 - disabled fclk
[ 321.557360] omap_hsmmc omap_hsmmc.0: omap_hsmmc_enable_fclk : 1890 - enabled fclk
[ 321.704834] omap_hsmmc omap_hsmmc.0: omap_hsmmc_disable_fclk : 1899 - disabled fclk
[ 321.713045] mmc0: new high speed SD card at address b368
[ 321.726306] omap_hsmmc omap_hsmmc.0: omap_hsmmc_enable_fclk : 1890 - enabled fclk
[ 321.748481] omap_hsmmc omap_hsmmc.0: omap_hsmmc_disable_fclk : 1899 - disabled fclk
[ 321.756730] mmcblk0: mmc0:b368 SDC 477 MiB
[ 321.769550] omap_hsmmc omap_hsmmc.0: omap_hsmmc_enable_fclk : 1890 - enabled fclk
[ 321.791883] omap_hsmmc omap_hsmmc.0: omap_hsmmc_disable_fclk : 1899 - disabled fclk
[ 321.808877] mmcblk0: p1 p2
[ 321.823822] omap_hsmmc omap_hsmmc.0: omap_hsmmc_enable_fclk : 1890 - enabled fclk
[ 321.831750] omap_hsmmc omap_hsmmc.0: omap_hsmmc_disable_fclk : 1899 - disabled fclk
...
...
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