linux-kernel - Re: [PATCH v6 0/3] PCI: Precision Time Measurement support

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Date:	Tue, 16 Aug 2016 09:27:05 +0800
From:	"Yong, Jonathan" <jonathan.yong@...el.com>
To:	Bjorn Helgaas <helgaas@...nel.org>
CC:	Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
	intel-wired-lan@...ts.osuosl.org,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 0/3] PCI: Precision Time Measurement support

On 08/16/2016 02:51, Bjorn Helgaas wrote:
>>
>> This line:
>> ctrl = PCI_PTM_CTRL_ENABLE | PCI_PTM_CTRL_ROOT;
>>
>> should also set the responder capable bit (7.32.2):
>> 	If PTM Root Capable is Set, this bit must be Set to 1b.
> 
> The PTM Responder Capable bit (bit 1 in Table 7-145) is a HwInit bit
> in the PTM Capability register, so it's read-only from the kernel's
> perspective.
> 
> The line you mention ("ctrl = PCI_PTM_CTRL_ENABLE | PCI_PTM_CTRL_ROOT")
> is turning on bits in the PTM Control register, not the Capability
> register.
> 

My bad, there is no "responder enable" bit control, patch looks good.