• Adrian Hunter's avatar
    mmc: sdhci: Add support for "Tuning Error" interrupts · b3855668
    Adrian Hunter authored
    Most Bay Trail devices do not enable UHS modes for the external sdcard slot
    the Lenovo Yoga Tablet 2 830 / 1050 and Lenovo Yoga Tablet 2 Pro 1380 (8",
    10" and 13") models however do enable this.
    
    Using a UHS cards in these tablets results in errors like this one:
    
    [  225.272001] mmc2: Unexpected interrupt 0x04000000.
    [  225.272024] mmc2: sdhci: ============ SDHCI REGISTER DUMP ===========
    [  225.272034] mmc2: sdhci: Sys addr:  0x0712c400 | Version:  0x0000b502
    [  225.272044] mmc2: sdhci: Blk size:  0x00007200 | Blk cnt:  0x00000007
    [  225.272054] mmc2: sdhci: Argument:  0x00000000 | Trn mode: 0x00000023
    [  225.272064] mmc2: sdhci: Present:   0x01e20002 | Host ctl: 0x00000016
    [  225.272073] mmc2: sdhci: Power:     0x0000000f | Blk gap:  0x00000000
    [  225.272082] mmc2: sdhci: Wake-up:   0x00000000 | Clock:    0x00000107
    [  225.272092] mmc2: sdhci: Timeout:   0x0000000e | Int stat: 0x00000001
    [  225.272101] mmc2: sdhci: Int enab:  0x03ff000b | Sig enab: 0x03ff000b
    [  225.272110] mmc2: sdhci: ACmd stat: 0x00000000 | Slot int: 0x00000001
    [  225.272119] mmc2: sdhci: Caps:      0x076864b2 | Caps_1:   0x00000004
    [  225.272129] mmc2: sdhci: Cmd:       0x00000c1b | Max curr: 0x00000000
    [  225.272138] mmc2: sdhci: Resp[0]:   0x00000c00 | Resp[1]:  0x00000000
    [  225.272147] mmc2: sdhci: Resp[2]:   0x00000000 | Resp[3]:  0x00000900
    [  225.272155] mmc2: sdhci: Host ctl2: 0x0000000c
    [  225.272164] mmc2: sdhci: ADMA Err:  0x00000003 | ADMA Ptr: 0x0712c200
    [  225.272172] mmc2: sdhci: ============================================
    
    which results in IO errors leading to issues accessing the sdcard.
    
    0x04000000 is a so-called "Tuning Error" which sofar the SDHCI driver
    does not support / enable. Modify the IRQ handler to process these.
    
    This fixes UHS microsd cards not working with these tablets.
    
    Link: https://lore.kernel.org/r/199bb4aa-c6b5-453e-be37-58bbf468800c@intel.comSigned-off-by: default avatarHans de Goede <hdegoede@redhat.com>
    Signed-off-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
    Cc: stable@vger.kernel.org
    Link: https://lore.kernel.org/r/20240410191639.526324-3-hdegoede@redhat.comSigned-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
    b3855668
sdhci.h 28.6 KB