On 11/01, Srinivas Kandagatla wrote:
> diff --git a/Documentation/devicetree/bindings/pci/qcom,pcie.txt b/Documentation/devicetree/bindings/pci/qcom,pcie.txt
> index 4059a6f..cec9bbc 100644
> --- a/Documentation/devicetree/bindings/pci/qcom,pcie.txt
> +++ b/Documentation/devicetree/bindings/pci/qcom,pcie.txt
> @@ -92,6 +93,19 @@
> - "aux" Auxiliary (AUX) clock
> - "bus_master" Master AXI clock
> - "bus_slave" Slave AXI clock
> +
> +- clock-names:
> + Usage: required for msm8996/apq8096
> + Value type: <stringlist>
> + Definition: Should contain the following entries
> + - "aux" Auxiliary (AUX) clock
> + - "bus_master" Master AXI clock
> + - "bus_slave" Slave AXI clock
> + - "pipe" Pipe Clock driving internal logic.
> + - "cfg" Configuration clk.
These two get the full stop but nothing else?
> + - "snoc_axi" SNOC AXI clk
> + - "cnoc_ahb" CNOC AHB clk
> + - "smmu_axi" SMMU AXI bus clk
These last three don't really go to the controller, so they
shouldn't be here. Perhaps we should make a wrapper node that
represents the aggre0 NOC/SMMU block that sits in front of the
PCIe controllers on this SoC? Then that node could be the parent
of this PCIe controller and populate it once it turns on these
few clocks.
The lack of a proper bus abstraction in the kernel is coming
through here.
> - resets:
> Usage: required
> Value type: <prop-encoded-array>
> @@ -137,6 +151,11 @@
> Definition: A phandle to the analog power supply for IC which generates
> reference clock
>
> +- vdda_1p8-supply:
> + Usage: required for msm8996/apq8096
> + Value type: <phandle>
> + Definition: A phandle to the analog power supply for PCIE_1P8
> +
This is very odd. Shouldn't the 1.8V analog supply go to the phy
and not the controller? Probably vdda_supply should be removed
from here as well as it looks to be a phy only thing.
> - phys:
> Usage: required for apq8084
> Value type: <phandle>
> @@ -231,3 +250,64 @@
> pinctrl-0 = <&pcie0_pins_default>;
> pinctrl-names = "default";
> };
> +
> +* Example for apq8096:
> +
> + pcie@00608000 {
Drop leading zeroes please
> + compatible = "qcom,pcie-msm8996", "snps,dw-pcie";
> + power-domains = <&gcc PCIE1_GDSC>;
> + bus-range = <0x00 0xff>;
> + num-lanes = <1>;
> +
> + status = "disabled";
> +
> + reg = <0x00608000 0x2000>,
> + <0x0d000000 0xf1d>,
> + <0x0d000f20 0xa8>,
> + <0x0d100000 0x100000>;
> +
> + reg-names = "parf", "dbi", "elbi","config";
Space between elbi and config?
> +
> + phys = <&pcie_phy 1>;
> + phy-names = "pciephy";
> +
> + #address-cells = <3>;
> + #size-cells = <2>;
> + ranges = <0x01000000 0x0 0x0d200000 0x0d200000 0x0 0x100000>,
> + <0x02000000 0x0 0x0d300000 0x0d300000 0x0 0xd00000>;
> +
> + interrupts = <GIC_SPI 413 IRQ_TYPE_NONE>;
> + interrupt-names = "msi";
> + #interrupt-cells = <1>;
> + interrupt-map-mask = <0 0 0 0x7>;
> + interrupt-map = <0 0 0 1 &intc 0 272 IRQ_TYPE_LEVEL_HIGH>, /* int_a */
> + <0 0 0 2 &intc 0 273 IRQ_TYPE_LEVEL_HIGH>, /* int_b */
> + <0 0 0 3 &intc 0 274 IRQ_TYPE_LEVEL_HIGH>, /* int_c */
> + <0 0 0 4 &intc 0 275 IRQ_TYPE_LEVEL_HIGH>; /* int_d */
> +
> + pinctrl-names = "default", "sleep";
> + pinctrl-0 = <&pcie1_clkreq_default &pcie1_perst_default &pcie1_wake_default>;
> + pinctrl-1 = <&pcie1_clkreq_sleep &pcie1_perst_default &pcie1_wake_sleep>;
> +
> + vdda-1p8-supply = <&pm8994_l12>;
> + vdda-supply = <&pm8994_l28>;
> + linux,pci-domain = <1>;
> +
> + clocks = <&gcc GCC_PCIE_1_PIPE_CLK>,
> + <&gcc GCC_PCIE_1_AUX_CLK>,
> + <&gcc GCC_PCIE_1_CFG_AHB_CLK>,
> + <&gcc GCC_PCIE_1_MSTR_AXI_CLK>,
> + <&gcc GCC_PCIE_1_SLV_AXI_CLK>,
> + <&gcc GCC_AGGRE0_SNOC_AXI_CLK>,
> + <&gcc GCC_AGGRE0_CNOC_AHB_CLK>,
> + <&gcc GCC_SMMU_AGGRE0_AXI_CLK>;
> +
> + clock-names = "pipe",
> + "aux",
> + "cfg",
> + "bus_master",
> + "bus_slave",
> + "snoc_axi",
> + "cnoc_ahb",
> + "smmu_axi";
> + };
> diff --git a/drivers/pci/host/pcie-qcom.c b/drivers/pci/host/pcie-qcom.c
> index 3593640..47e7817 100644
> --- a/drivers/pci/host/pcie-qcom.c
> +++ b/drivers/pci/host/pcie-qcom.c
> @@ -429,6 +636,22 @@ static int qcom_pcie_link_up(struct pcie_port *pp)
> return !!(val & PCI_EXP_LNKSTA_DLLLA);
> }
>
> +
Noise?
> static void qcom_pcie_host_init(struct pcie_port *pp)
> {
> struct qcom_pcie *pcie = to_qcom_pcie(pp);
> @@ -439,11 +662,13 @@ static void qcom_pcie_host_init(struct pcie_port *pp)
> ret = pcie->ops->init(pcie);
> if (ret)
> goto err_deinit;
> -
Leave this line there?
> ret = phy_power_on(pcie->phy);
> if (ret)
> goto err_deinit;
>
> + if (pcie->ops->post_init)
> + pcie->ops->post_init(pcie);
> +
> dw_pcie_setup_rc(pp);
>
> if (IS_ENABLED(CONFIG_PCI_MSI))
> @@ -487,12 +712,22 @@ static const struct qcom_pcie_ops ops_v0 = {
> .get_resources = qcom_pcie_get_resources_v0,
> .init = qcom_pcie_init_v0,
> .deinit = qcom_pcie_deinit_v0,
> + .ltssm_enable = qcom_pcie_v0_v1_ltssm_enable,
> };
>
> static const struct qcom_pcie_ops ops_v1 = {
> .get_resources = qcom_pcie_get_resources_v1,
> .init = qcom_pcie_init_v1,
> .deinit = qcom_pcie_deinit_v1,
> + .ltssm_enable = qcom_pcie_v0_v1_ltssm_enable,
> +};
> +
> +static const struct qcom_pcie_ops ops_msm8996 = {
Why not just ops_v2? The hw version is v2 now on 8996.
> + .get_resources = qcom_pcie_get_resources_msm8996,
> + .init = qcom_pcie_init_msm8996,
> + .post_init = qcom_pcie_post_init_msm8996,
> + .deinit = qcom_pcie_deinit_msm8996,
> + .ltssm_enable = qcom_pcie_msm8996_ltssm_enable,
> };
>
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