linux-kernel - [PATCH] PCI/ASPM: Make SUNIX serial card acceptable latency unlimited

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Message-Id: <20220930091050.193096-1-chris.chiu@canonical.com>
Date:   Fri, 30 Sep 2022 17:10:50 +0800
From:   Chris Chiu <chris.chiu@...onical.com>
To:     bhelgaas@...gle.com, mika.westerberg@...ux.intel.com
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        Chris Chiu <chris.chiu@...onical.com>
Subject: [PATCH] PCI/ASPM: Make SUNIX serial card acceptable latency unlimited

SUNIX serial card advertise L1 acceptable L0S exit latency to be
< 2us, L1 < 32us, but the link capability shows they're unlimited.

It fails the latency check and prohibits the ASPM L1 from being
enabled. The L1 acceptable latency quirk fixes the issue.

Signed-off-by: Chris Chiu <chris.chiu@...onical.com>
---
 drivers/pci/quirks.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 4944798e75b5..e1663e43846e 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -5955,4 +5955,5 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x56b0, aspm_l1_acceptable_latency
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x56b1, aspm_l1_acceptable_latency);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x56c0, aspm_l1_acceptable_latency);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x56c1, aspm_l1_acceptable_latency);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SUNIX, PCI_DEVICE_ID_SUNIX_1999, aspm_l1_acceptable_latency);
 #endif
-- 
2.25.1