Linux/TMS320DM8148: CD pins are not working as per expectation.

I have cross checked your inputs with my code. Still both SD-Cards are not usable with hot-pluggable feature.
Please find below things of my setup & testing,
From U-Boot pin mux of used pins:
MMC-1:
MUX_VAL(PINCNTL72, (IEN | IPU | FCN7 )) /* SD0_SDCD */\

MMC-2:
MUX_VAL(PINCNTL80, (IEN | IPU | FCN2 )) /* SD1_SDCD */\


From Kernel use of both MMC in board file,
static struct omap2_hsmmc_info mmc[] = {
{
.mmc = 2,
.caps = MMC_CAP_4_BIT_DATA,
.gpio_cd = -EINVAL, /* check setup_mmc2_pin_mux() */
.gpio_wp = -EINVAL,
.ocr_mask = MMC_VDD_33_34,
},
{
.mmc = 1,
.caps = MMC_CAP_4_BIT_DATA,
.gpio_cd = -EINVAL, /* check setup_mmc1_pin_mux() */
.gpio_wp = -EINVAL,
.ocr_mask = MMC_VDD_33_34,
},
{} /* Terminator */
};

static int setup_mmc2_pin_mux(void)
{
return omap_mux_init_signal("spi0_cs1.gpio1_6", TI814X_PIN_INPUT_PULL_UP);
}
static int setup_mmc1_pin_mux(void)
{
return omap_mux_init_signal("uart0_ctsn.mmc0_sdcd",
TI814X_PIN_INPUT_PULL_UP);
}
static void __init ti8148_evm_init(void)
{
...
setup_mmc2_pin_mux();
setup_mmc1_pin_mux();
...
}


Run time behaviour:
On system bootup logs,
mmc0: host does not support reading read-only switch. assuming write-enable.
mmc0: new SDXC card at address aaaa
mmcblk0: mmc0:aaaa SC64G 59.4 GiB
mmcblk0:
mmc1: host does not support reading read-only switch. assuming write-enable.
mmc1: new SDXC card at address aaaa
mmcblk1: mmc1:aaaa SC64G 59.4 GiB
mmcblk1:

# mount
rootfs on / type rootfs (rw)
ubi0:rootfs on / type ubifs (rw,relatime)
devtmpfs on /dev type devtmpfs (rw,relatime,size=503580k,nr_inodes=103567,mode=755)
proc on /proc type proc (rw,relatime)
none on /dev/shm type tmpfs (rw,relatime)
devpts on /dev/pts type devpts (rw,relatime,mode=600)
usbfs on /proc/bus/usb type usbfs (rw,relatime)
tmpfs on /var/volatile type tmpfs (rw,relatime,size=16384k)
tmpfs on /media/ram type tmpfs (rw,relatime,size=16384k)
sysfs on /sys type sysfs (rw,relatime)
/dev/mmcblk0 on /media/mmcblk0 type vfat (rw,relatime,fmask=0000,dmask=0000,allow_utime=0022,codepage=cp437,iocharset=iso8859-1,shortname=mixed
,errors=remount-ro)
/dev/mmcblk1 on /media/mmcblk1 type vfat (rw,relatime,fmask=0000,dmask=0000,allow_utime=0022,codepage=cp437,iocharset=iso8859-1,shortname=mixed
,errors=remount-ro)


After removing MMC2 from system at run time below prints start coming and in top CPU utilization by system is almost 100%,
mmcblk1: error -110 sending status command
mmcblk1: error -110 sending read/write command, response 0x0, card status 0x0
mmcblk1: error -110 transferring data, sector 229550, nr 32, card status 0x0
end_request: I/O error, dev mmcblk1, sector 229550
mmcblk1: error -110 sending status command
mmcblk1: error -110 sending read/write command, response 0x0, card status 0x0
mmcblk1: error -110 transferring data, sector 229551, nr 31, card status 0x0
end_request: I/O error, dev mmcblk1, sector 229551

Also /dev/mmcblk1 is not removed.

After removing MMC1 from system at run time below prints start coming and in top CPU utilization by system is almost 100%,
mmcblk0: error -110 sending status command
mmcblk0: error -110 sending read/write command, response 0x0, card status 0x0
mmcblk0: error -110 transferring data, sector 5942094, nr 128, card status 0x0
mmcblk0: error -110 requesting status
end_request: I/O error, dev mmcblk0, sector 5942094
end_request: I/O error, dev mmcblk0, sector 5942102

Also /dev/mmcblk0 is not removed.


Let me know where it's going wrong.

Ravi Bhuva said:

MMC-1:
MUX_VAL(PINCNTL72, (IEN | IPU | FCN7 )) /* SD0_SDCD */\

MMC-2:
MUX_VAL(PINCNTL80, (IEN | IPU | FCN2 )) /* SD1_SDCD */\

Ravi Bhuva said:

omap_mux_init_signal("uart0_ctsn.mmc0_sdcd",

You are still using sdx_sdcd signal instead of gpio.

Regards,
Pavel

Hi Pavel,

I have two SD-Cards in my system. And i don't want to use external GPIO for card detection, i want to use in-built CD pins only.

It's MMC1 with below MUX,
omap_mux_init_signal("uart0_ctsn.mmc0_sdcd",

This pin doesn't have any GPIO MUX functionality.

   _TI814X_MUXENTRY(UART0_CTSN, 0,
         "uart0_ctsn", "uart4_rxd_mux3", NULL, "dcan1_tx",
         "spi1_cs3", NULL, "mmc0_sdcd", NULL, NULL, NULL, NULL,
         NULL),
We have provided GP1[15] externally but we will remove it if all is working with CD pin only, so i am not using this pin here. Also i have kept GP1[15] pin mux as below,

MUX_VAL(PINCNTL121, (IEN | IPU | DISABLED )) /* safe_mode */\

Also i have mmc2 with below configuration,
return omap_mux_init_signal("spi0_cs1.gpio1_6", TI814X_PIN_INPUT_PULL_UP);
Still MMC2 is not usable with hot-pluggable feature.

Let me know if we have any disconnect.

Hi Pavel,

With provision of GPIO i am already able to get hot-pluggable functionality. And with only CD pins (sdcd pins) i believe we will not able to get hot-pluggable feature.

Only one query now, if I remove CD pins (sdcd pins) from my hardware, it will not affect any functionality loss right? (GPIOs are connected and I have provided them with mmc structure in board file)

Regards,

Ravi Bhuva.