diff options
| -rw-r--r-- | target/linux/ipq806x/patches-5.4/096-PCI-qcom-Make-sure-PCIe-is-reset-before-init-for-rev.patch | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/target/linux/ipq806x/patches-5.4/096-PCI-qcom-Make-sure-PCIe-is-reset-before-init-for-rev.patch b/target/linux/ipq806x/patches-5.4/096-PCI-qcom-Make-sure-PCIe-is-reset-before-init-for-rev.patch new file mode 100644 index 0000000000..5c93d3199a --- /dev/null +++ b/target/linux/ipq806x/patches-5.4/096-PCI-qcom-Make-sure-PCIe-is-reset-before-init-for-rev.patch @@ -0,0 +1,51 @@ +From 1960d75e3251659be8276529e4d01cf6993d9f4a Mon Sep 17 00:00:00 2001 +From: Ansuel Smith <ansuelsmth@gmail.com> +Date: Tue, 1 Sep 2020 14:21:44 +0200 +Subject: [PATCH] PCI: qcom: Make sure PCIe is reset before init for rev 2.1.0 + +Qsdk U-Boot can incorrectly leave the PCIe interface in an undefined +state if bootm command is used instead of bootipq. This is caused by the +not deinit of PCIe when bootm is called. Reset the PCIe before init +anyway to fix this U-Boot bug. + +Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com> +Fixes: 82a823833f4e ("PCI: qcom: Add Qualcomm PCIe controller driver") +Cc: stable@vger.kernel.org # v4.19+ +--- + drivers/pci/controller/dwc/pcie-qcom.c | 13 +++++++++++++ + 1 file changed, 13 insertions(+) + +diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c +index 3aac77a295ba..82336bbaf8dc 100644 +--- a/drivers/pci/controller/dwc/pcie-qcom.c ++++ b/drivers/pci/controller/dwc/pcie-qcom.c +@@ -302,6 +302,9 @@ static void qcom_pcie_deinit_2_1_0(struct qcom_pcie *pcie) + reset_control_assert(res->por_reset); + reset_control_assert(res->ext_reset); + reset_control_assert(res->phy_reset); ++ ++ writel(1, pcie->parf + PCIE20_PARF_PHY_CTRL); ++ + regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies); + } + +@@ -314,6 +317,16 @@ static int qcom_pcie_init_2_1_0(struct qcom_pcie *pcie) + u32 val; + int ret; + ++ /* reset the PCIe interface as uboot can leave it undefined state */ ++ reset_control_assert(res->pci_reset); ++ reset_control_assert(res->axi_reset); ++ reset_control_assert(res->ahb_reset); ++ reset_control_assert(res->por_reset); ++ reset_control_assert(res->ext_reset); ++ reset_control_assert(res->phy_reset); ++ ++ writel(1, pcie->parf + PCIE20_PARF_PHY_CTRL); ++ + ret = regulator_bulk_enable(ARRAY_SIZE(res->supplies), res->supplies); + if (ret < 0) { + dev_err(dev, "cannot enable regulators\n"); +-- +2.27.0 + |