linux-kernel - Re: [PATCH] PCI: Check for PCIe downtraining conditions

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Message-ID: <f260078b-6918-7fd9-39d6-e9f300e4c048@codeaurora.org>
Date:   Thu, 31 May 2018 11:38:13 -0400
From:   Sinan Kaya <okaya@...eaurora.org>
To:     Alex_Gagniuc@...lteam.com, mr.nuke.me@...il.com,
        bhelgaas@...gle.com
Cc:     Austin.Bolen@...l.com, Shyam.Iyer@...l.com, keith.busch@...el.com,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI: Check for PCIe downtraining conditions

On 5/31/2018 11:29 AM, Alex_Gagniuc@...lteam.com wrote:
> On 5/31/2018 10:28 AM, Sinan Kaya wrote:
>> On 5/31/2018 11:05 AM, Alexandru Gagniuc wrote:
>>> +static void pcie_max_link_cap(struct pci_dev *dev, enum pci_bus_speed *speed,
>>> +				enum pcie_link_width *width)
>>> +{
>>> +	uint32_t lnkcap;
>>> +
>>> +	pcie_capability_read_dword(dev, PCI_EXP_LNKCAP, &lnkcap);
>>> +
>>> +	*speed = pcie_link_speed[lnkcap & PCI_EXP_LNKCAP_SLS];
>>> +	*width = (lnkcap & PCI_EXP_LNKCAP_MLW) >> PCI_EXP_LNKCAP_MLW_SHIFT;
>>> +}
>>> +
>>> +static void pcie_cur_link_sta(struct pci_dev *dev, enum pci_bus_speed *speed,
>>> +				enum pcie_link_width *width)
>>> +{
>>> +	uint16_t lnksta;
>>> +
>>> +	pcie_capability_read_word(dev, PCI_EXP_LNKSTA, &lnksta);
>>> +	*speed = pcie_link_speed[lnksta & PCI_EXP_LNKSTA_CLS];
>>> +	*width = (lnksta & PCI_EXP_LNKSTA_NLW) >> PCI_EXP_LNKSTA_NLW_SHIFT;
>>> +}
>>> +
>>> +static const char *pcie_bus_speed_name(enum pci_bus_speed speed)
>>> +{
>>> +	switch (speed) {
>>> +	case PCIE_SPEED_2_5GT:
>>> +		return "2.5 GT/s";
>>> +	case PCIE_SPEED_5_0GT:
>>> +		return "5.0 GT/s";
>>> +	case PCIE_SPEED_8_0GT:
>>> +		return "8.0 GT/s";
>>> +	default:
>>> +		return "unknown";
>>> +	}
>>> +}
>>
>> I thought Bjorn added some functions to retrieve this now.
> 
> Hmm. I couldn't find them.

https://lkml.org/lkml/2018/3/30/553

are you working on linux-next?

> 
> Alex
> 
> 


-- 
Sinan Kaya
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.