diff options
Diffstat (limited to 'target/linux/generic/backport-5.15/822-v5.13-advertise-lack-of-built-in-msi-handling.patch')
| -rw-r--r-- | target/linux/generic/backport-5.15/822-v5.13-advertise-lack-of-built-in-msi-handling.patch | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/target/linux/generic/backport-5.15/822-v5.13-advertise-lack-of-built-in-msi-handling.patch b/target/linux/generic/backport-5.15/822-v5.13-advertise-lack-of-built-in-msi-handling.patch new file mode 100644 index 0000000000..c11aedd814 --- /dev/null +++ b/target/linux/generic/backport-5.15/822-v5.13-advertise-lack-of-built-in-msi-handling.patch @@ -0,0 +1,59 @@ +From 645e9c38383d7fcde2784ee537fa18ec9bed54d9 Mon Sep 17 00:00:00 2001 +From: Thomas Gleixner <tglx@linutronix.de> +Date: Tue, 30 Mar 2021 16:11:43 +0100 +Subject: PCI: mediatek: Advertise lack of built-in MSI handling + +Some Mediatek host bridges cannot handle MSIs, which is sad. +This also results in an ugly warning at device probe time, +as the core PCI code wasn't told that MSIs were not available. + +Advertise this fact to the rest of the core PCI code by +using the 'msi_domain' attribute, which still opens the possibility +for another block to provide the MSI functionnality. + +[maz: commit message, switched over to msi_domain attribute] + +Link: https://lore.kernel.org/r/20210330151145.997953-13-maz@kernel.org +Reported-by: Frank Wunderlich <frank-w@public-files.de> +Signed-off-by: Thomas Gleixner <tglx@linutronix.de> +Signed-off-by: Marc Zyngier <maz@kernel.org> +Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> +Acked-by: Bjorn Helgaas <bhelgaas@google.com> +--- + drivers/pci/controller/pcie-mediatek.c | 4 ++++ + 1 file changed, 4 insertions(+) + +--- a/drivers/pci/controller/pcie-mediatek.c ++++ b/drivers/pci/controller/pcie-mediatek.c +@@ -143,6 +143,7 @@ struct mtk_pcie_port; + * struct mtk_pcie_soc - differentiate between host generations + * @need_fix_class_id: whether this host's class ID needed to be fixed or not + * @need_fix_device_id: whether this host's device ID needed to be fixed or not ++ * @no_msi: Bridge has no MSI support, and relies on an external block + * @device_id: device ID which this host need to be fixed + * @ops: pointer to configuration access functions + * @startup: pointer to controller setting functions +@@ -151,6 +152,7 @@ struct mtk_pcie_port; + struct mtk_pcie_soc { + bool need_fix_class_id; + bool need_fix_device_id; ++ bool no_msi; + unsigned int device_id; + struct pci_ops *ops; + int (*startup)(struct mtk_pcie_port *port); +@@ -1087,6 +1089,7 @@ static int mtk_pcie_probe(struct platfor + + host->ops = pcie->soc->ops; + host->sysdata = pcie; ++ host->msi_domain = pcie->soc->no_msi; + + err = pci_host_probe(host); + if (err) +@@ -1176,6 +1179,7 @@ static const struct dev_pm_ops mtk_pcie_ + }; + + static const struct mtk_pcie_soc mtk_pcie_soc_v1 = { ++ .no_msi = true, + .ops = &mtk_pcie_ops, + .startup = mtk_pcie_startup_port, + }; |