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 ... ... -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html