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PCI: xgene: Fix IB window setup
Commit6dce5aa59e
("PCI: xgene: Use inbound resources for setup") broke PCI support on XGene. The cause is the IB resources are now sorted in address order instead of being in DT dma-ranges order. The result is which inbound registers are used for each region are swapped. I don't know the details about this h/w, but it appears that IB region 0 registers can't handle a size greater than 4GB. In any case, limiting the size for region 0 is enough to get back to the original assignment of dma-ranges to regions. Link: https://lore.kernel.org/all/CA+enf=v9rY_xnZML01oEgKLmvY1NGBUUhnSJaETmXtDtXfaczA@mail.gmail.com/ Link: https://lore.kernel.org/r/20211129173637.303201-1-robh@kernel.org Fixes:6dce5aa59e
("PCI: xgene: Use inbound resources for setup") Reported-by: Stéphane Graber <stgraber@ubuntu.com> Tested-by: Stéphane Graber <stgraber@ubuntu.com> Signed-off-by: Rob Herring <robh@kernel.org> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Reviewed-by: Krzysztof Wilczyński <kw@linux.com> Cc: stable@vger.kernel.org # v5.5+
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@ -465,7 +465,7 @@ static int xgene_pcie_select_ib_reg(u8 *ib_reg_mask, u64 size)
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return 1;
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}
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if ((size > SZ_1K) && (size < SZ_1T) && !(*ib_reg_mask & (1 << 0))) {
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if ((size > SZ_1K) && (size < SZ_4G) && !(*ib_reg_mask & (1 << 0))) {
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*ib_reg_mask |= (1 << 0);
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return 0;
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}
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