[PATCH] PCI/ASPM: Should not report ASPM support to BIOS if FADT indicates ASPM is unsupported

From: Manyi Li <limanyi@uniontech.com>
To: bhelgaas@google.com, refactormyself@gmail.com, kw@linux.com,
	rajatja@google.com
Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
	Manyi Li <limanyi@uniontech.com>
Subject: [PATCH] PCI/ASPM: Should not report ASPM support to BIOS if FADT indicates ASPM is unsupported
Date: Wed, 13 Jul 2022 19:26:12 +0800	[thread overview]
Message-ID: <20220713112612.6935-1-limanyi@uniontech.com> (raw)

Startup log of ASUSTeK X456UJ Notebook show:
[    0.130563] ACPI FADT declares the system doesn't support PCIe ASPM, so disable it
[   48.092472] pcieport 0000:00:1c.5: PCIe Bus Error: severity=Corrected, type=Physical Layer, (Receiver ID)
[   48.092479] pcieport 0000:00:1c.5:   device [8086:9d15] error status/mask=00000001/00002000
[   48.092481] pcieport 0000:00:1c.5:    [ 0] RxErr
[   48.092490] pcieport 0000:00:1c.5: AER: Corrected error received: 0000:00:1c.5
[   48.092504] pcieport 0000:00:1c.5: AER: can't find device of ID00e5
[   48.092506] pcieport 0000:00:1c.5: AER: Corrected error received: 0000:00:1c.5

Signed-off-by: Manyi Li <limanyi@uniontech.com>
---
 drivers/pci/pcie/aspm.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
index a96b7424c9bc..b173d3c75ae7 100644
--- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -1359,6 +1359,7 @@ void pcie_no_aspm(void)
 	if (!aspm_force) {
 		aspm_policy = POLICY_DEFAULT;
 		aspm_disabled = 1;
+		aspm_support_enabled = false;
 	}
 }
 
-- 
2.20.1



