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authorThomas Gleixner <[email protected]>2021-03-30 16:11:43 +0100
committerLorenzo Pieralisi <[email protected]>2021-04-20 14:11:22 +0100
commit645e9c38383d7fcde2784ee537fa18ec9bed54d9 (patch)
tree7fcb24278ba059b548c58adc6621e290219b5316
parent9ec37efb87832b578d7972fc80b04d94f5d2bbe3 (diff)
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/[email protected] Reported-by: Frank Wunderlich <[email protected]> Signed-off-by: Thomas Gleixner <[email protected]> Signed-off-by: Marc Zyngier <[email protected]> Signed-off-by: Lorenzo Pieralisi <[email protected]> Acked-by: Bjorn Helgaas <[email protected]>
-rw-r--r--drivers/pci/controller/pcie-mediatek.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c
index 23548b517e4b..9c10d87b6134 100644
--- 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 platform_device *pdev)
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_pm_ops = {
};
static const struct mtk_pcie_soc mtk_pcie_soc_v1 = {
+ .no_msi = true,
.ops = &mtk_pcie_ops,
.startup = mtk_pcie_startup_port,
};