From: Daniel Golle Date: Tue, 3 Oct 2023 01:32:35 +0000 (+0100) Subject: mediatek: fix PCIe #PERST being de-asserted too early X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=6a2e17d5c1451025396ba523e9f2d112212c7261;p=openwrt%2Fstaging%2Fansuel.git mediatek: fix PCIe #PERST being de-asserted too early The driver for MediaTek gen3 PCIe hosts de-asserts all reset signals at the same time using a single register write operation. Delay the de-assertion of the #PERST signal by 100ms as some PCIe devices fail to come up otherwise. Signed-off-by: Daniel Golle --- diff --git a/target/linux/mediatek/patches-5.15/611-pcie-mediatek-gen3-PERST-for-100ms.patch b/target/linux/mediatek/patches-5.15/611-pcie-mediatek-gen3-PERST-for-100ms.patch new file mode 100644 index 0000000000..d526aded85 --- /dev/null +++ b/target/linux/mediatek/patches-5.15/611-pcie-mediatek-gen3-PERST-for-100ms.patch @@ -0,0 +1,17 @@ +--- a/drivers/pci/controller/pcie-mediatek-gen3.c ++++ b/drivers/pci/controller/pcie-mediatek-gen3.c +@@ -319,7 +319,13 @@ static int mtk_pcie_startup_port(struct + msleep(100); + + /* De-assert reset signals */ +- val &= ~(PCIE_MAC_RSTB | PCIE_PHY_RSTB | PCIE_BRG_RSTB | PCIE_PE_RSTB); ++ val &= ~(PCIE_MAC_RSTB | PCIE_PHY_RSTB | PCIE_BRG_RSTB); ++ writel_relaxed(val, port->base + PCIE_RST_CTRL_REG); ++ ++ msleep(100); ++ ++ /* De-assert PERST# signals */ ++ val &= ~(PCIE_PE_RSTB); + writel_relaxed(val, port->base + PCIE_RST_CTRL_REG); + + /* Check if the link is up or not */ diff --git a/target/linux/mediatek/patches-5.15/922-v6.1-PCI-mediatek-gen3-change-driver-name-to-mtk-pcie-gen.patch b/target/linux/mediatek/patches-5.15/922-v6.1-PCI-mediatek-gen3-change-driver-name-to-mtk-pcie-gen.patch index 44aed2207d..f026f5573c 100644 --- a/target/linux/mediatek/patches-5.15/922-v6.1-PCI-mediatek-gen3-change-driver-name-to-mtk-pcie-gen.patch +++ b/target/linux/mediatek/patches-5.15/922-v6.1-PCI-mediatek-gen3-change-driver-name-to-mtk-pcie-gen.patch @@ -9,7 +9,7 @@ Signed-off-by: Felix Fietkau --- a/drivers/pci/controller/pcie-mediatek-gen3.c +++ b/drivers/pci/controller/pcie-mediatek-gen3.c -@@ -1025,7 +1025,7 @@ static struct platform_driver mtk_pcie_d +@@ -1031,7 +1031,7 @@ static struct platform_driver mtk_pcie_d .probe = mtk_pcie_probe, .remove = mtk_pcie_remove, .driver = { diff --git a/target/linux/mediatek/patches-6.1/611-pcie-mediatek-gen3-PERST-for-100ms.patch b/target/linux/mediatek/patches-6.1/611-pcie-mediatek-gen3-PERST-for-100ms.patch new file mode 100644 index 0000000000..f88efc0732 --- /dev/null +++ b/target/linux/mediatek/patches-6.1/611-pcie-mediatek-gen3-PERST-for-100ms.patch @@ -0,0 +1,19 @@ +--- a/drivers/pci/controller/pcie-mediatek-gen3.c ++++ b/drivers/pci/controller/pcie-mediatek-gen3.c +@@ -350,9 +350,15 @@ static int mtk_pcie_startup_port(struct + msleep(100); + + /* De-assert reset signals */ +- val &= ~(PCIE_MAC_RSTB | PCIE_PHY_RSTB | PCIE_BRG_RSTB | PCIE_PE_RSTB); ++ val &= ~(PCIE_MAC_RSTB | PCIE_PHY_RSTB | PCIE_BRG_RSTB); + writel_relaxed(val, pcie->base + PCIE_RST_CTRL_REG); + ++ msleep(100); ++ ++ /* De-assert PERST# signals */ ++ val &= ~(PCIE_PE_RSTB); ++ writel_relaxed(val, port->base + PCIE_RST_CTRL_REG); ++ + /* Check if the link is up or not */ + err = readl_poll_timeout(pcie->base + PCIE_LINK_STATUS_REG, val, + !!(val & PCIE_PORT_LINKUP), 20,