[PATCH] PCI: dwc: ep: Fix advertised resizable BAR size again

Niklas Cassel
2024-11-16T01:00:52Z

The advertised resizable BAR size was fixed in commit 72e34b8593e0 ("PCI:
dwc: endpoint: Fix advertised resizable BAR size").

Commit 867ab111b242 ("PCI: dwc: ep: Add a generic dw_pcie_ep_linkdown() API
to handle Link Down event") was included shortly after this, and moved the
code to another function. When the code was moved, this fix was mistakenly
lost.

According to the spec, it is illegal to not have a bit set in
PCI_REBAR_CAP, and 1 MB is the smallest size allowed.

Set bit 4 in PCI_REBAR_CAP, so that we actually advertise support for a
1 MB BAR size.

Cc: stable@vger.kernel.org
Fixes: 867ab111b242 ("PCI: dwc: ep: Add a generic dw_pcie_ep_linkdown() API to handle Link Down event")
Signed-off-by: Niklas Cassel <cassel@kernel.org>
---
drivers/pci/controller/dwc/pcie-designware-ep.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
index 43ba5c6738df1..cc8ff4a014368 100644
--- a/drivers/pci/controller/dwc/pcie-designware-ep.c
+++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
@@ -689,7 +689,7 @@ static void dw_pcie_ep_init_non_sticky_registers(struct dw_pcie *pci)
* for 1 MB BAR size only.
*/
for (i = 0; i < nbars; i++, offset += PCI_REBAR_CTRL)
- dw_pcie_writel_dbi(pci, offset + PCI_REBAR_CAP, 0x0);
+ dw_pcie_writel_dbi(pci, offset + PCI_REBAR_CAP, BIT(4));
}

dw_pcie_setup(pci);
--
2.47.0