linux-kernel - Re: [PATCH] PCI: brcmstb: Fix use of incorrect constant

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Message-ID: <23cc004b-f3e9-4685-880d-362619c180e6@broadcom.com>
Date: Mon, 6 Oct 2025 12:35:19 -0700
From: Florian Fainelli <florian.fainelli@...adcom.com>
To: Jim Quinlan <james.quinlan@...adcom.com>, linux-pci@...r.kernel.org,
 Nicolas Saenz Julienne <nsaenz@...nel.org>,
 Bjorn Helgaas <bhelgaas@...gle.com>,
 Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
 bcm-kernel-feedback-list@...adcom.com, jim2101024@...il.com
Cc: Lorenzo Pieralisi <lpieralisi@...nel.org>,
 Krzysztof Wilczyński <kwilczynski@...nel.org>,
 Manivannan Sadhasivam <mani@...nel.org>, Rob Herring <robh@...nel.org>,
 "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE"
 <linux-rpi-kernel@...ts.infradead.org>,
 "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE"
 <linux-arm-kernel@...ts.infradead.org>,
 open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PCI: brcmstb: Fix use of incorrect constant



On 10/3/2025 10:04 AM, Jim Quinlan wrote:
> The driver was using the PCIE_LINK_STATE_L1 constant as a field mask for
> setting the private PCI_EXP_LNKCAP register, but this constant is
> Linux-created and has nothing to do with the PCIe spec.  Serendipitously,
> the value of this constant was correct for its usage until after 6.1, when
> its value changed from BIT(1) to BIT(2);
> 
> In addition, the driver was assuming that the HW is ASPM L1 capable when it
> should not be telling the HW what it is capable of.
> 
> Fixes: caab002d5069 ("PCI: brcmstb: Disable L0s component of ASPM if requested")
> Reported-by: Bjorn Helgaas <bhelgaas@...gle.com>
> 
> Signed-off-by: Jim Quinlan <james.quinlan@...adcom.com>

Reviewed-by: Florian Fainelli <florian.fainelli@...adcom.com>
-- 
Florian