• Yu Zhao's avatar
    mmc: sdhci-pci-o2micro: Add quirk for O2 Micro dev 0x8620 rev 0x01 · 51698949
    Yu Zhao authored
    
    
    This device reports SDHCI_CLOCK_INT_STABLE even though it's not
    ready to take SDHCI_CLOCK_CARD_EN. The symptom is that reading
    SDHCI_CLOCK_CONTROL after enabling the clock shows absence of the
    bit from the register (e.g. expecting 0x0000fa07 = 0x0000fa03 |
    SDHCI_CLOCK_CARD_EN but only observed the first operand).
    
    mmc1: Timeout waiting for hardware cmd interrupt.
    mmc1: sdhci: ============ SDHCI REGISTER DUMP ===========
    mmc1: sdhci: Sys addr:  0x00000000 | Version:  0x00000603
    mmc1: sdhci: Blk size:  0x00000000 | Blk cnt:  0x00000000
    mmc1: sdhci: Argument:  0x00000000 | Trn mode: 0x00000000
    mmc1: sdhci: Present:   0x01ff0001 | Host ctl: 0x00000001
    mmc1: sdhci: Power:     0x0000000f | Blk gap:  0x00000000
    mmc1: sdhci: Wake-up:   0x00000000 | Clock:    0x0000fa03
    mmc1: sdhci: Timeout:   0x00000000 | Int stat: 0x00000000
    mmc1: sdhci: Int enab:  0x00ff0083 | Sig enab: 0x00ff0083
    mmc1: sdhci: AC12 err:  0x00000000 | Slot int: 0x00000000
    mmc1: sdhci: Caps:      0x25fcc8bf | Caps_1:   0x00002077
    mmc1: sdhci: Cmd:       0x00000000 | Max curr: 0x005800c8
    mmc1: sdhci: Resp[0]:   0x00000000 | Resp[1]:  0x00000000
    mmc1: sdhci: Resp[2]:   0x00000000 | Resp[3]:  0x00000000
    mmc1: sdhci: Host ctl2: 0x00000008
    mmc1: sdhci: ADMA Err:  0x00000000 | ADMA Ptr: 0x00000000
    mmc1: sdhci: ============================================
    
    The problem happens during wakeup from S3. Adding a delay quirk
    after power up reliably fixes the problem.
    
    Signed-off-by: default avatarYu Zhao <yuzhao@google.com>
    Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
    51698949