diff options
Diffstat (limited to 'target/linux/ipq806x/patches-5.4/093-8-v5.8-ipq806x-PCI-qcom-Support-pci-speed-set-for-ipq806x.patch')
| -rw-r--r-- | target/linux/ipq806x/patches-5.4/093-8-v5.8-ipq806x-PCI-qcom-Support-pci-speed-set-for-ipq806x.patch | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/target/linux/ipq806x/patches-5.4/093-8-v5.8-ipq806x-PCI-qcom-Support-pci-speed-set-for-ipq806x.patch b/target/linux/ipq806x/patches-5.4/093-8-v5.8-ipq806x-PCI-qcom-Support-pci-speed-set-for-ipq806x.patch new file mode 100644 index 0000000000..9f60f14619 --- /dev/null +++ b/target/linux/ipq806x/patches-5.4/093-8-v5.8-ipq806x-PCI-qcom-Support-pci-speed-set-for-ipq806x.patch @@ -0,0 +1,74 @@ +From 51ed2c2b60265006bde7531d10993cf24def0aee Mon Sep 17 00:00:00 2001 +From: Sham Muthayyan <smuthayy@codeaurora.org> +Date: Mon, 15 Jun 2020 23:06:07 +0200 +Subject: PCI: qcom: Support pci speed set for ipq806x + +Some SoC based on ipq8064/5 needs to be limited to pci GEN1 speed due to +some hardware limitations. Add support for speed setting defined by the +max-link-speed binding. If not defined the max speed is set to GEN2 by +default. + +Link: https://lore.kernel.org/r/20200615210608.21469-12-ansuelsmth@gmail.com +Signed-off-by: Sham Muthayyan <smuthayy@codeaurora.org> +Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com> +Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> +Reviewed-by: Rob Herring <robh@kernel.org> +Acked-by: Stanimir Varbanov <svarbanov@mm-sol.com> +--- + +Backported with light changes: +* One include is missing in kernel 5.4 + + drivers/pci/controller/dwc/pcie-qcom.c | 13 +++++++++++++ + 1 file changed, 13 insertions(+) + +--- a/drivers/pci/controller/dwc/pcie-qcom.c ++++ b/drivers/pci/controller/dwc/pcie-qcom.c +@@ -27,6 +27,7 @@ + #include <linux/slab.h> + #include <linux/types.h> + ++#include "../../pci.h" + #include "pcie-designware.h" + + #define PCIE20_PARF_SYS_CTRL 0x00 +@@ -98,6 +99,8 @@ + #define PCIE20_v3_PARF_SLV_ADDR_SPACE_SIZE 0x358 + #define SLV_ADDR_SPACE_SZ 0x10000000 + ++#define PCIE20_LNK_CONTROL2_LINK_STATUS2 0xa0 ++ + #define QCOM_PCIE_2_1_0_MAX_SUPPLY 3 + #define QCOM_PCIE_2_1_0_MAX_CLOCKS 5 + struct qcom_pcie_resources_2_1_0 { +@@ -184,6 +187,7 @@ struct qcom_pcie { + struct phy *phy; + struct gpio_desc *reset; + const struct qcom_pcie_ops *ops; ++ int gen; + }; + + #define to_qcom_pcie(x) dev_get_drvdata((x)->dev) +@@ -384,6 +388,11 @@ static int qcom_pcie_init_2_1_0(struct q + /* wait for clock acquisition */ + usleep_range(1000, 1500); + ++ if (pcie->gen == 1) { ++ val = readl(pci->dbi_base + PCIE20_LNK_CONTROL2_LINK_STATUS2); ++ val |= PCI_EXP_LNKSTA_CLS_2_5GB; ++ writel(val, pci->dbi_base + PCIE20_LNK_CONTROL2_LINK_STATUS2); ++ } + + /* Set the Max TLP size to 2K, instead of using default of 4K */ + writel(CFG_REMOTE_RD_REQ_BRIDGE_SIZE_2K, +@@ -1248,6 +1257,10 @@ static int qcom_pcie_probe(struct platfo + goto err_pm_runtime_put; + } + ++ pcie->gen = of_pci_get_max_link_speed(pdev->dev.of_node); ++ if (pcie->gen < 0) ++ pcie->gen = 2; ++ + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "parf"); + pcie->parf = devm_ioremap_resource(dev, res); + if (IS_ERR(pcie->parf)) { |