linux-kernel - Re: [v4] PCI: dwc: Add the debugfs property to provide the LTSSM status of the PCIe link

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Message-ID: <3b540c87-1d55-4289-b347-6bc2da49f407@163.com>
Date: Sun, 23 Feb 2025 13:30:48 +0800
From: Hans Zhang <18255117159@....com>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc: jingoohan1@...il.com, shradha.t@...sung.com, lpieralisi@...nel.org,
 kw@...ux.com, robh@...nel.org, bhelgaas@...gle.com, Frank.Li@....com,
 linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
 rockswang7@...il.com, Niklas Cassel <cassel@...nel.org>
Subject: Re: [v4] PCI: dwc: Add the debugfs property to provide the LTSSM
 status of the PCIe link



On 2025/2/23 00:39, Manivannan Sadhasivam wrote:
>> +
>> +What:		/sys/kernel/debug/dwc_pcie_<dev>/ltssm_status
>> +Date:		February 2025
>> +Contact:	Hans Zhang <18255117159@....com>
>> +Description:	(RO) Read will return the current value of the PCIe link status raw value and
>> +		string status.
> 
> 'Read will return the current PCIe LTSSM state in both string and raw value.'
> 
>>   
>> +char *dw_ltssm_sts_string(enum dw_pcie_ltssm ltssm)
> 
> const char *dw_pcie_ltssm_string()
> 
>> +{
>> +	char *str;
> 
> const char *
> 
>> +
>> +	switch (ltssm) {
>> +#define DW_PCIE_LTSSM_NAME(n) case n: str = #n; break
>> @@ -683,6 +714,8 @@ static inline enum dw_pcie_ltssm dw_pcie_get_ltssm(struct dw_pcie *pci)
>>   	return (enum dw_pcie_ltssm)FIELD_GET(PORT_LOGIC_LTSSM_STATE_MASK, val);
>>   }
>>   
>> +char *dw_ltssm_sts_string(enum dw_pcie_ltssm ltssm);
> 
> const char *dw_pcie_ltssm_string()

These recommendations will be changed in the next version.

Thank you very much Mani.

Best regards
Hans