From: "Jiawen Wu" <jiawenwu@trustnetic.com>
To: "'Andrew Lunn'" <andrew@lunn.ch>
Cc: <andi.shyti@kernel.org>, <jarkko.nikula@linux.intel.com>,
<andriy.shevchenko@linux.intel.com>,
<mika.westerberg@linux.intel.com>, <jsd@semihalf.com>,
<davem@davemloft.net>, <edumazet@google.com>, <kuba@kernel.org>,
<pabeni@redhat.com>, <rmk+kernel@armlinux.org.uk>,
<piotr.raczynski@intel.com>, <linux-i2c@vger.kernel.org>,
<netdev@vger.kernel.org>, <mengyuanlou@net-swift.com>,
<duanqiangwen@net-swift.com>
Subject: RE: [PATCH net 0/3] Add I2C bus lock for Wangxun
Date: Mon, 26 Aug 2024 10:04:42 +0800 [thread overview]
Message-ID: <01d701daf75c$50db4450$f291ccf0$@trustnetic.com> (raw)
In-Reply-To: <888f78a9-dea9-4f66-a4d0-00a57039733d@lunn.ch>
On Mon, Aug 26, 2024 9:33 AM, Andrew Lunn wrote:
> On Fri, Aug 23, 2024 at 11:02:39AM +0800, Jiawen Wu wrote:
> > Sometimes the driver can not get the SFP information because the I2C bus
> > is accessed by the firmware at the same time.
>
> Please could you explain this some more. What firmware?
It's the firmware of our ethernet devices.
> There some registers which are clear on read. They don't work when you
> have multiple entities reading them.
I'm not trying to multiple access the I2C registers, but these registers cannot
be accessed by other interfaces in the process of reading complete information
each time. So there is a semaphore needed that locks up the entire read process.
next prev parent reply other threads:[~2024-08-26 2:05 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-08-23 3:02 [PATCH net 0/3] Add I2C bus lock for Wangxun Jiawen Wu
2024-08-23 3:02 ` [PATCH net 1/3] net: txgbe: add IO address in I2C platform device data Jiawen Wu
2024-08-23 14:14 ` Andy Shevchenko
2024-08-23 3:02 ` [PATCH net 2/3] i2c: designware: add device private data passing to lock functions Jiawen Wu
2024-08-23 14:06 ` Andy Shevchenko
2024-08-27 13:24 ` Paolo Abeni
2024-08-29 5:16 ` kernel test robot
2024-08-23 3:02 ` [PATCH net 3/3] i2c: designware: support hardware lock for Wangxun 10Gb NIC Jiawen Wu
2024-08-23 14:13 ` Andy Shevchenko
2024-08-29 9:15 ` Jiawen Wu
2024-08-29 10:59 ` 'Andy Shevchenko'
2024-08-23 11:04 ` [PATCH net 0/3] Add I2C bus lock for Wangxun Jarkko Nikula
2024-08-27 2:26 ` Jiawen Wu
2024-08-26 1:32 ` Andrew Lunn
2024-08-26 2:04 ` Jiawen Wu [this message]
2024-08-26 2:33 ` Andrew Lunn
2024-08-27 2:21 ` Jiawen Wu
2024-08-27 12:18 ` Andrew Lunn
2024-08-29 6:40 ` Jiawen Wu
2024-08-29 15:27 ` Andrew Lunn
2024-09-03 6:31 ` Jiawen Wu
2024-09-03 12:45 ` Andrew Lunn
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