From: Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com>
To: linux-aspeed@lists.ozlabs.org
Subject: AST2600 i2c irq issue
Date: Thu, 24 Oct 2019 11:03:13 -0700 [thread overview]
Message-ID: <5508f358-77b8-f5f7-2577-79da25e4e5ea@linux.intel.com> (raw)
In-Reply-To: <333e959f-9296-b6d5-9442-b979a8abd50d@linux.vnet.ibm.com>
Hi Eddie,
On 10/22/2019 1:24 PM, Eddie James wrote:
[...]
> 7: irq[00000000] before[rx] after[stop]
'irq[]' here and '10[]' below are the same register. This log means an
interrupt came with empty status.
> ??? 00[00008001]
> ??? 04[007ee005]
> ??? 08[00000000]
> ??? 0c[0000607f]
> ??? 10[00000004]??? <<< this is interesting. this has changed since the
> start of the interrupt handler.
The interrupt status was updated lately at here. Looks like there is a
timing gap in H/W between interrupt triggering and status updating. I
haven't seen this issue in previous H/W versions.
This issue can be resolved by your patch but ultimately this issue
should be fixed in AST2600 A1 revision H/W if possible so that we can
remove the unnecessary interrupt handling.
Thanks,
Jae
prev parent reply other threads:[~2019-10-24 18:03 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-17 6:14 AST2600 i2c irq issue Joel Stanley
2019-10-17 20:31 ` Eddie James
2019-10-17 22:29 ` Jae Hyun Yoo
2019-10-18 4:28 ` Peter Rosin
2019-10-18 16:07 ` Jae Hyun Yoo
2019-10-19 1:36 ` Ryan Chen
2019-10-21 12:16 ` Wolfram Sang
2019-10-21 18:27 ` Jae Hyun Yoo
2019-10-22 20:24 ` Eddie James
2019-10-24 18:03 ` Jae Hyun Yoo [this message]
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