Solved
STM32MP157 mmc1 not switch into high speed mode
Hi supporter, I have two boards, one is my custom board and another is dk2. Those boards are not support high speed of mmc1. The mmc2 is into high speed and has 50Mhz clock.
Below is some info about mmc1 and mmc2 on dk2 board.
root@stm32mp1:~# cat /sys/kernel/debug/mmc0/ios
clock: 25000000 Hz
actual clock: 24750000 Hz
vdd: 21 (3.3 ~ 3.4 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)
signal voltage: 0 (3.30 V)
driver type: 0 (driver type B)
root@stm32mp1:~# cat /sys/kernel/debug/mmc1/ios
clock: 50000000 Hz
actual clock: 49500000 Hz
vdd: 21 (3.3 ~ 3.4 V)
bus mode: 2 (push-pull)
chip select: 0 (don't care)
power mode: 2 (on)
bus width: 2 (4 bits)
timing spec: 2 (sd high-speed)
signal voltage: 0 (3.30 V)
driver type: 0 (driver type B)
root@stm32mp1:~# mount -t debugfs debugfs /mnt/
root@stm32mp1:~# cat /mnt/^C
root@stm32mp1:~# dmesg| grep mmc
[ 0.000000] Kernel command line: root=/dev/mmcblk0p6 rootwait rw console=ttySTM0,115200
[ 1.948032] mmci-pl18x 58005000.sdmmc: Linked as a consumer to regulator.8
[ 1.953617] mmci-pl18x 58005000.sdmmc: mmc0: PL180 manf 53 rev2 at 0x58005000 irq 58,0 (pio)
[ 1.991010] mmci-pl18x 58007000.sdmmc: allocated mmc-pwrseq
[ 1.995496] mmci-pl18x 58007000.sdmmc: Linked as a consumer to regulator.8
[ 2.003329] mmci-pl18x 58007000.sdmmc: mmc1: PL180 manf 53 rev1 at 0x58007000 irq 59,0 (pio)
[ 2.042312] mmc0: host does not support reading read-only switch, assuming write-enable
[ 2.060730] mmc0: Problem switching card into high-speed mode!
[ 2.069832] mmc0: new SDHC card at address 0001
[ 2.079128] mmcblk0: mmc0:0001 SD 14.6 GiB
[ 2.094173] mmc1: queuing unknown CIS tuple 0x80 (2 bytes)
[ 2.104142] mmc1: queuing unknown CIS tuple 0x80 (3 bytes)
[ 2.116461] mmc1: queuing unknown CIS tuple 0x80 (3 bytes)
[ 2.127848] mmc1: queuing unknown CIS tuple 0x80 (7 bytes)
[ 2.136986] mmc1: queuing unknown CIS tuple 0x80 (3 bytes)
[ 2.183527] mmc1: queuing unknown CIS tuple 0x80 (6 bytes)
[ 2.189127] mmcblk0: p1 p2 p3 p4 p5 p6 p7
[ 2.277342] mmc1: new high speed SDIO card at address 0001I found an error message "mmc0: Problem switching card into high-speed mode!". What cause the mmc1 not into speed mode? In my application stuation, we need mmc1 at 50Mhz to more higher io speed for read/write file on sdcard.