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meson64-6.18: temporary patch for pcie vs aspm woes on Amlogic

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- See https://lore.kernel.org/linux-amlogic/20251031161323.GA1688975@bhelgaas/
  - and Neil's https://lists.infradead.org/pipermail/linux-amlogic/2025-November/025692.html
This commit is contained in:
Ricardo Pardini 2025-11-03 21:04:01 +01:00 committed by Igor
parent fab1be2e8b
commit 21955bd205
1 changed files with 88 additions and 0 deletions
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88
patch/kernel/archive/meson64-6.18/temporary-6.18-rc4-temporary-fix-for-pcie-probe-failure-due-to.patch Normal file
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@ -0,0 +1,88 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Ricardo Pardini <ricardo@pardini.net>
Date: Mon, 3 Nov 2025 21:02:03 +0100
Subject: 6.18-rc4: temporary fixes for pcie probe failure due to ASPM stuff
- https://lore.kernel.org/linux-amlogic/20251031161323.GA1688975@bhelgaas/
- https://lists.infradead.org/pipermail/linux-amlogic/2025-November/025692.html
---
arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi | 2 +-
drivers/pci/controller/dwc/pci-meson.c | 42 +---------
2 files changed, 5 insertions(+), 39 deletions(-)
diff --git a/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi b/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi
index 111111111111..222222222222 100644
--- a/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi
+++ b/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi
@@ -138,7 +138,7 @@ pcie: pcie@fc000000 {
reg = <0x0 0xfc000000 0x0 0x400000>,
<0x0 0xff648000 0x0 0x2000>,
<0x0 0xfc400000 0x0 0x200000>;
- reg-names = "elbi", "cfg", "config";
+ reg-names = "dbi", "cfg", "config";
interrupts = <GIC_SPI 221 IRQ_TYPE_LEVEL_HIGH>;
#interrupt-cells = <1>;
interrupt-map-mask = <0 0 0 0>;
diff --git a/drivers/pci/controller/dwc/pci-meson.c b/drivers/pci/controller/dwc/pci-meson.c
index 111111111111..222222222222 100644
--- a/drivers/pci/controller/dwc/pci-meson.c
+++ b/drivers/pci/controller/dwc/pci-meson.c
@@ -109,10 +109,6 @@ static int meson_pcie_get_mems(struct platform_device *pdev,
{
struct dw_pcie *pci = &mp->pci;
- pci->dbi_base = devm_platform_ioremap_resource_byname(pdev, "elbi");
- if (IS_ERR(pci->dbi_base))
- return PTR_ERR(pci->dbi_base);
-
mp->cfg_base = devm_platform_ioremap_resource_byname(pdev, "cfg");
if (IS_ERR(mp->cfg_base))
return PTR_ERR(mp->cfg_base);
@@ -338,40 +334,10 @@ static struct pci_ops meson_pci_ops = {
static bool meson_pcie_link_up(struct dw_pcie *pci)
{
struct meson_pcie *mp = to_meson_pcie(pci);
- struct device *dev = pci->dev;
- u32 speed_okay = 0;
- u32 cnt = 0;
- u32 state12, state17, smlh_up, ltssm_up, rdlh_up;
-
- do {
- state12 = meson_cfg_readl(mp, PCIE_CFG_STATUS12);
- state17 = meson_cfg_readl(mp, PCIE_CFG_STATUS17);
- smlh_up = IS_SMLH_LINK_UP(state12);
- rdlh_up = IS_RDLH_LINK_UP(state12);
- ltssm_up = IS_LTSSM_UP(state12);
-
- if (PM_CURRENT_STATE(state17) < PCIE_GEN3)
- speed_okay = 1;
-
- if (smlh_up)
- dev_dbg(dev, "smlh_link_up is on\n");
- if (rdlh_up)
- dev_dbg(dev, "rdlh_link_up is on\n");
- if (ltssm_up)
- dev_dbg(dev, "ltssm_up is on\n");
- if (speed_okay)
- dev_dbg(dev, "speed_okay\n");
-
- if (smlh_up && rdlh_up && ltssm_up && speed_okay)
- return true;
-
- cnt++;
-
- udelay(10);
- } while (cnt < WAIT_LINKUP_TIMEOUT);
-
- dev_err(dev, "error: wait linkup timeout\n");
- return false;
+ u32 state12;
+
+ state12 = meson_cfg_readl(mp, PCIE_CFG_STATUS12);
+ return IS_SMLH_LINK_UP(state12) && IS_RDLH_LINK_UP(state12);
}
static int meson_pcie_host_init(struct dw_pcie_rp *pp)
--
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