Boot time regression on Xilinx Zynq7000

[Michal Simek]

Hi Daniel,

On 08. 07. 20 8:13, Rajan Vaja wrote:
> Hi Michal
> 
>> -----Original Message-----
>> From: Michal Simek <michal.simek at xilinx.com>
>> Sent: 08 July 2020 11:32 AM
>> To: Daniel Mack <daniel at zonque.org>; linux-arm-kernel at lists.infradead.org
>> Cc: Rajan Vaja <RAJANV at xilinx.com>; Michal Simek <michals at xilinx.com>; Daniel
>> Lezcano <daniel.lezcano at linaro.org>
>> Subject: Re: Boot time regression on Xilinx Zynq7000
>>
>>
>>
>> On 26. 06. 20 8:51, Daniel Mack wrote:
>>> Hi,
>>>
>>> I'm seeing a regression on a Zynq7000 board between 5.5 and 5.6 and
>>> bisected it down to f5ac896b6a23eb ("clocksource/drivers/cadence-ttc:
>>> Use ttc driver as platform driver"). With the patch in place, I see a 5
>>> second delay in the kernel boot:
>>>
>>> [    1.540000] random: fast init done
>>> [    1.690000] random: crng init done
>>> [    2.720000] libphy: mdio: probed
>>>
>>> -- boot freezes for about 5 seconds --
>>>
>>> [    7.780000] i2c /dev entries driver
>>> [    7.800000] cdns-i2c e0004000.i2c: 100 kHz mmio e0004000 irq 21
>>> [    7.800000] cdns-i2c e0005000.i2c: 100 kHz mmio e0005000 irq 22
>>> [    7.810000] EDAC MC: ECC not enabled
>>> [    7.820000] Xilinx Zynq CpuIdle Driver started
>>> [    7.820000] sdhci: Secure Digital Host Controller Interface driver
>>> [    7.830000] sdhci: Copyright(c) Pierre Ossman
>>> [    7.830000] sdhci-pltfm: SDHCI platform and OF driver helper
>>> [    7.870000] mmc0: SDHCI controller on e0100000.mmc [e0100000.mmc]
>>> using ADMA
>>> [    7.870000] ledtrig-cpu: registered to indicate activity on CPUs
>>> [    7.880000] clocksource: ttc_clocksource: mask: 0xffff max_cycles:
>>> 0xffff, max_idle_ns: 537538477 ns
>>> [    7.890000] clocksource: Switched to clocksource ttc_clocksource
>>>
>>>
>>> Reverting the patch on top of 5.6 solves this issue. I haven't dug any
>>> further yet. Any idea?
>>
>> Rajan: Can you please take a look at it?
> [Rajan] Sure. I will look into this.

I see that Rajan asked for kernel config in separate email and I can't
see any reply on that. Please let us know if you still see any problem
with it.

Thanks,
Michal