QAIC reset failure

[Baruch Siach]

Hi qaic driver maintainers,

I am testing an A100 device on arm64 platform. Kernel version is current
Linus master as of commit 052d534373b7. The driver is unable to reset
the device properly.

[  137.706765] pci 0000:01:00.0: enabling device (0000 -> 0002)
[  137.712528] pci 0000:02:00.0: enabling device (0000 -> 0002)
[  137.718230] qaic 0000:03:00.0: enabling device (0000 -> 0002)
[  137.725720] [drm] Initialized qaic 0.0.0 20190618 for 0000:03:00.0 on minor 0
[  137.734326] mhi mhi0: Requested to power ON
[  137.738520] mhi mhi0: Power on setup success
[  137.855108] mhi mhi0: Wait for device to enter SBL or Mission mode
[  137.861578] qaic_timesync mhi0_QAIC_TIMESYNC: 20: Failed to receive START channel command completion
[  137.870733] qaic_timesync mhi0_QAIC_TIMESYNC: 21: Failed to reset channel, still resetting
[  137.879063] qaic_timesync mhi0_QAIC_TIMESYNC: 20: Failed to reset channel, still resetting
[  137.887334] qaic_timesync: probe of mhi0_QAIC_TIMESYNC failed with error -5
[  137.894866] qaic_timesync mhi0_QAIC_TIMESYNC: 20: Failed to receive START channel command completion
[  137.904006] qaic_timesync mhi0_QAIC_TIMESYNC: 21: Failed to reset channel, still resetting
[  137.912263] qaic_timesync mhi0_QAIC_TIMESYNC: 20: Failed to reset channel, still resetting
[  137.920517] qaic_timesync: probe of mhi0_QAIC_TIMESYNC failed with error -5
[  140.807091] mhi mhi0: Device failed to enter MHI Ready
[  143.695094] mhi mhi0: Device failed to enter MHI Ready

This is with firmware from SDK version 1.12.2.0. I tried also version
1.10.0.193 with similar results.

Some more state information from MHI debugfs below.

/sys/kernel/debug/mhi/mhi0/regdump:
Host PM state: SYS ERROR Process Device state: RESET EE: DISABLE
Device EE: PRIMARY BOOTLOADER state: SYS ERROR
MHI_REGLEN: 0x100
MHI_VER: 0x1000000
MHI_CFG: 0x8000000
MHI_CTRL: 0x0
MHI_STATUS: 0xff04
MHI_WAKE_DB: 0x1
BHI_EXECENV: 0x0
BHI_STATUS: 0xa93f0935
BHI_ERRCODE: 0x0
BHI_ERRDBG1: 0xc0300000
BHI_ERRDBG2: 0xb
BHI_ERRDBG3: 0xcabb0

/sys/kernel/debug/mhi/mhi0/states:
PM state: SYS ERROR Process Device: Inactive MHI state: RESET EE: DISABLE wake: true
M0: 2 M2: 0 M3: 0 device wake: 0 pending packets: 0

Any idea?

Thanks,
baruch

-- 
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