On 3. 6. 2016 10:49, Ulf Hansson wrote:
On 1 June 2016 at 15:10, Michal Kadlic <michal.kadlic@xxxxxxxxx> wrote:
Hello,
newbie here, please bear with me...
It seems that CMD6/SD_SWITCH request locks up the mmc-moxart controller. It
does not respond to any command after CMD6.
The fix suggested by Mr. Jonas Jensen <jonas.jensen@xxxxxxxxx> is to ignore
the SD_SWITCH request in moxart_request()
My question is - looking at mmc_read_switch() in drivers/mmc/core/sd.c -
would be -EINVAL a proper response in this case?
No, this seems like a bad solution to the problem.
If the SD_SWITCH command isn't working, then it's better to find out
*why* instead of only disable it. That's because it would mean to also
disable all higher speed modes for the cards.
BTW, under what circumstances does the lock up happens? In all cases
when trying to detect an inserted card?
Kind regards
Uffe
It seems that the lockup happens no matter what mode 0 query is sent to
the controller.
I found a bug that sets APP_CMD flag even on regular commands , which
did affect CMD6, but fixing the bug did not fix CMD6.
I will try to repeat the lockup with different SD card, but so far the
sequence that leads up to this lockup is following:
[ 62.270000] mmc0: starting CMD0 arg 00000000 flags 000000c0
[ 62.280000] mmc0: req done (CMD0): 0: 00000000 00000000 00000000 00000000
[ 62.290000] mmc0: clock 400000Hz busmode 2 powermode 2 cs 0 Vdd 23
width 0 timing 0
[ 62.310000] mmc0: starting CMD8 arg 000001aa flags 000002f5
[ 62.310000] mmc0: req done (CMD8): 0: 000001aa 00000000 00000000 00000000
[ 62.320000] mmc0: starting CMD55 arg 00000000 flags 000000f5
[ 62.330000] mmc0: req done (CMD55): 0: 00000120 00000000 00000000
00000000
[ 62.340000] mmc0: starting CMD41 arg 40800000 flags 000000e1
[ 62.340000] moxart-mmc: Sending command with APP_CMD_flag
[ 62.350000] mmc0: req done (CMD41): 0: 00ff8000 00000000 00000000
00000000
[ 62.380000] mmc0: starting CMD55 arg 00000000 flags 000000f5
[ 62.380000] mmc0: req done (CMD55): 0: 00000120 00000000 00000000
00000000
[ 62.390000] mmc0: starting CMD41 arg 40800000 flags 000000e1
[ 62.400000] moxart-mmc: Sending command with APP_CMD_flag
[ 62.400000] mmc0: req done (CMD41): 0: c0ff8000 00000000 00000000
00000000
[ 62.420000] mmc0: starting CMD2 arg 00000000 flags 00000067
[ 62.420000] mmc0: req done (CMD2): 0: 1d414453 44202020 02b01154 0100e9fb
[ 62.430000] mmc0: starting CMD3 arg 00000000 flags 00000075
[ 62.440000] mmc0: req done (CMD3): 0: 59b40520 00000000 00000000 00000000
[ 62.450000] mmc0: starting CMD9 arg 59b40000 flags 00000007
[ 62.460000] mmc0: req done (CMD9): 0: 400e0032 5b590000 39bd7f80 0a400045
[ 62.460000] mmc0: starting CMD7 arg 59b40000 flags 00000015
[ 62.470000] mmc0: req done (CMD7): 0: 00000700 00000000 00000000 00000000
[ 62.480000] mmc0: starting CMD55 arg 59b40000 flags 00000095
[ 62.490000] mmc0: req done (CMD55): 0: 00000920 00000000 00000000
00000000
[ 62.500000] mmc0: starting CMD51 arg 00000000 flags 000000b5
[ 62.500000] mmc0: blksz 8 blocks 1 flags 00000200 tsac 100 ms nsac 0
[ 62.520000] moxart-mmc: Sending command with APP_CMD_flag
[ 62.520000] mmc0: req done (CMD51): 0: 00000920 00000000 00000000
00000000
[ 62.530000] mmc0: 8 bytes transferred: 0
[ 62.540000] mmc0: starting CMD55 arg 59b40000 flags 00000095
[ 62.540000] mmc0: req done (CMD55): 0: 00000920 00000000 00000000
00000000
[ 62.560000] mmc0: starting CMD13 arg 00000000 flags 000001b5
[ 62.560000] mmc0: blksz 64 blocks 1 flags 00000200 tsac 100 ms nsac 0
[ 62.570000] moxart-mmc: Sending command with APP_CMD_flag
[ 62.580000] mmc0: req done (CMD13): 0: 00000920 00000000 00000000
00000000
[ 62.590000] mmc0: 64 bytes transferred: 0
[ 62.590000] mmc0: starting CMD6 arg 00fffff0 flags 000000b5
[ 62.600000] mmc0: blksz 64 blocks 1 flags 00000200 tsac 100 ms nsac 0
[ 63.610000] mmc-moxart 98e00000.mmc: timed out waiting for status
[ 66.350000] mmc0: req done (CMD6): 0: 00000900 00000000 00000000 00000000
[ 66.350000] mmc0: 64 bytes transferred: -110
[ 66.360000] mmc0: error -110 whilst initialising SD card
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