From: York Sun <york.sun@nxp.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] FSL PCIe LTSSM >= PCI_LTSSM_L0 equals link up
Date: Mon, 28 Aug 2017 16:55:06 +0000 [thread overview]
Message-ID: <VI1PR04MB2078693229053F59A24226F09A9E0@VI1PR04MB2078.eurprd04.prod.outlook.com> (raw)
In-Reply-To: 1503938907.4350.28.camel@infinera.com
On 08/28/2017 09:48 AM, Joakim Tjernlund wrote:
> FSL PCIe controller drivers before REV 3 has this test for link up:
> enabled = ltssm >= PCI_LTSSM_L0;
>
> We have a PCIe dev. that stays in LTSSM=0x51 (Polling Compliance) when non ready
> for PCI transaktions. When FSL PCIe controller tries to access this device, it
> hangs forever.
>
> Is LTSSM=0x51 really a "legal" state for link up?
> If not, what is a suitable range(maybe LO <= ltssm <= L0s(0x27)) ?
>
> Jocke
>
> BTW, the same test is valid in Linux too.
>
Jocke,
I am not an expert on PCIe. Please if this thread is helpful,
http://patchwork.ozlabs.org/patch/801519/.
York
next prev parent reply other threads:[~2017-08-28 16:55 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-28 16:48 [U-Boot] FSL PCIe LTSSM >= PCI_LTSSM_L0 equals link up Joakim Tjernlund
2017-08-28 16:55 ` York Sun [this message]
2017-08-28 17:09 ` Joakim Tjernlund
2017-08-28 17:14 ` York Sun
2017-08-29 3:19 ` Xiaowei Bao
2017-08-29 6:45 ` Joakim Tjernlund
2017-08-29 9:53 ` Xiaowei Bao
2017-08-29 10:26 ` Joakim Tjernlund
2017-08-29 10:46 ` Xiaowei Bao
2017-08-29 10:49 ` Joakim Tjernlund
2017-08-29 11:01 ` Xiaowei Bao
2017-09-05 11:08 ` Joakim Tjernlund
2017-09-06 15:36 ` York Sun
2017-09-07 8:12 ` Mingkai Hu
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