From 6b6fafc1abc7c046c57732a8cd1d2443fd60b370 Mon Sep 17 00:00:00 2001 From: Vidya Sagar Date: Thu, 3 Dec 2020 19:04:47 +0530 Subject: [PATCH] PCI: tegra: Fix ASPM-L1SS advertisement disable code If the absence of CLKREQ# signal is indicated by the absence of "supports-clkreq" in the device-tree node, current driver is disabling the advertisement of ASPM-L1 Sub-States *before* the ASPM-L1 Sub-States offset is correctly initialized. Since default value of the ASPM-L1SS offset is zero, this is causing the Vendor-ID wrongly programmed to 0x10d2 instead of Nvidia's 0x10de thereby the quirks applicable for Tegra194 are not being applied. This patch fixes this issue by refactoring the code that disables the ASPM-L1SS advertisement. Link: https://lore.kernel.org/r/20201203133451.17716-2-vidyas@nvidia.com Fixes: 56e15a238d92 ("PCI: tegra: Add Tegra194 PCIe support") Signed-off-by: Vidya Sagar Signed-off-by: Lorenzo Pieralisi --- drivers/pci/controller/dwc/pcie-tegra194.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c index 648e731..4c966e9 100644 --- a/drivers/pci/controller/dwc/pcie-tegra194.c +++ b/drivers/pci/controller/dwc/pcie-tegra194.c @@ -863,12 +863,6 @@ static void tegra_pcie_prepare_host(struct pcie_port *pp) pcie->pcie_cap_base = dw_pcie_find_capability(&pcie->pci, PCI_CAP_ID_EXP); - /* Disable ASPM-L1SS advertisement if there is no CLKREQ routing */ - if (!pcie->supports_clkreq) { - disable_aspm_l11(pcie); - disable_aspm_l12(pcie); - } - val = dw_pcie_readl_dbi(pci, PCI_IO_BASE); val &= ~(IO_BASE_IO_DECODE | IO_BASE_IO_DECODE_BIT8); dw_pcie_writel_dbi(pci, PCI_IO_BASE, val); @@ -897,6 +891,12 @@ static void tegra_pcie_prepare_host(struct pcie_port *pp) init_host_aspm(pcie); + /* Disable ASPM-L1SS advertisement if there is no CLKREQ routing */ + if (!pcie->supports_clkreq) { + disable_aspm_l11(pcie); + disable_aspm_l12(pcie); + } + val = dw_pcie_readl_dbi(pci, GEN3_RELATED_OFF); val &= ~GEN3_RELATED_OFF_GEN3_ZRXDC_NONCOMPL; dw_pcie_writel_dbi(pci, GEN3_RELATED_OFF, val); -- 2.7.4