From: Bjorn Helgaas <helgaas@kernel.org>
To: Ajay Agarwal <ajayagarwal@google.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>,
Kuppuswamy Sathyanarayanan
<sathyanarayanan.kuppuswamy@linux.intel.com>,
Vidya Sagar <vidyas@nvidia.com>,
Nikhil Devshatwar <nikhilnd@google.com>,
Manu Gautam <manugautam@google.com>,
"David E. Box" <david.e.box@linux.intel.com>,
Kai-Heng Feng <kai.heng.feng@canonical.com>,
Michael Bottini <michael.a.bottini@linux.intel.com>,
linux-pci@vger.kernel.org
Subject: Re: [PATCH 3/3] PCI/ASPM: Remove unnecessary ASPM_STATE_L1SS check
Date: Mon, 1 May 2023 12:55:18 -0500 [thread overview]
Message-ID: <20230501175518.GA594484@bhelgaas> (raw)
In-Reply-To: <20230411111034.1473044-4-ajayagarwal@google.com>
On Tue, Apr 11, 2023 at 04:40:34PM +0530, Ajay Agarwal wrote:
> Currently the driver checks if ASPM_STATE_L1SS is supported
> before calling aspm_calc_l1ss_info(), only for this function to
> return if ASPM_STATE_L1_2_MASK is not supported. Simplify the
> logic by directly checking for L1.2 mask.
>
> Signed-off-by: Ajay Agarwal <ajayagarwal@google.com>
> ---
> drivers/pci/pcie/aspm.c | 5 +----
> 1 file changed, 1 insertion(+), 4 deletions(-)
>
> diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
> index 7c9935f331f1..8c45835e8016 100644
> --- a/drivers/pci/pcie/aspm.c
> +++ b/drivers/pci/pcie/aspm.c
> @@ -481,9 +481,6 @@ static void aspm_calc_l1ss_info(struct pcie_link_state *link,
> u32 pctl1, pctl2, cctl1, cctl2;
> u32 pl1_2_enables, cl1_2_enables;
>
> - if (!(link->aspm_support & ASPM_STATE_L1_2_MASK))
> - return;
> -
> /* Choose the greater of the two Port Common_Mode_Restore_Times */
> val1 = (parent_l1ss_cap & PCI_L1SS_CAP_CM_RESTORE_TIME) >> 8;
> val2 = (child_l1ss_cap & PCI_L1SS_CAP_CM_RESTORE_TIME) >> 8;
> @@ -616,7 +613,7 @@ static void aspm_l1ss_init(struct pcie_link_state *link)
> if (parent_l1ss_ctl1 & child_l1ss_ctl1 & PCI_L1SS_CTL1_PCIPM_L1_2)
> link->aspm_enabled |= ASPM_STATE_L1_2_PCIPM;
>
> - if (link->aspm_support & ASPM_STATE_L1SS)
> + if (link->aspm_support & ASPM_STATE_L1_2_MASK)
> aspm_calc_l1ss_info(link, parent_l1ss_cap, child_l1ss_cap);
I think the reason it was this way is because several of the relevant
names use "l1ss":
ASPM_STATE_L1SS
aspm_calc_l1ss_info
calc_l1ss_pwron
But everything in aspm_calc_l1ss_info() is L1.2-specific, so I think
it would make sense to use your patch, and at the same time, rename
aspm_calc_l1ss_info() and calc_l1ss_pwron() to aspm_calc_l12_info()
and calc_l12_pwron() to match.
Bjorn
next prev parent reply other threads:[~2023-05-01 17:55 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-11 11:10 [PATCH 0/3] ASPM: aspm_disable/default/support state handling fixes Ajay Agarwal
2023-04-11 11:10 ` [PATCH 1/3] PCI/ASPM: Disable ASPM_STATE_L1 only when class driver disables L1 ASPM Ajay Agarwal
2023-05-01 17:21 ` Bjorn Helgaas
2023-05-02 12:38 ` Ajay Agarwal
2023-05-02 16:07 ` Bjorn Helgaas
2023-05-02 18:32 ` Ajay Agarwal
2023-04-11 11:10 ` [PATCH 2/3] PCI/ASPM: Set ASPM_STATE_L1 when class driver enables L1ss Ajay Agarwal
2023-05-01 17:44 ` Bjorn Helgaas
2023-05-02 13:02 ` Ajay Agarwal
2023-05-02 16:02 ` Bjorn Helgaas
2023-05-02 18:44 ` Ajay Agarwal
2023-04-11 11:10 ` [PATCH 3/3] PCI/ASPM: Remove unnecessary ASPM_STATE_L1SS check Ajay Agarwal
2023-05-01 17:55 ` Bjorn Helgaas [this message]
2023-05-02 13:07 ` Ajay Agarwal
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