From c6aac196b80039ae1716b9af635c06992e62171f Mon Sep 17 00:00:00 2001 From: Sven Eckelmann Date: Mon, 16 Apr 2018 13:51:15 +0200 Subject: [PATCH] ipq40xx: fix gpio-hog related boot issues The pinctrl initialization fails with the MSM pinctrl code and gpio-hogs because either the gpio ranges are not yet initialized (missing gpio-range in DT) or that the msm driver unconditionally tries to re-initializes the ranges (gpio-range in DT). To allow gpio-hogs and similar early-boot gpio code, the gpio-ranges must be in the device tree and the pinctrl-msm code must check whether the range was already initialized by the DT. Signed-off-by: Sven Eckelmann [drop changes to unrelated dtsi files, refresh patches] Signed-off-by: Mathias Kresin --- ...msm-fix-gpio-hog-related-boot-issues.patch | 103 ++++++++++++++++++ ...use-v2-of-the-kpss-bringup-mechanism.patch | 4 +- ...-USB-nodes-to-ipq4019-SoC-device-tre.patch | 2 +- .../701-dts-ipq4019-add-mdio-node.patch | 2 +- ...702-dts-ipq4019-add-PHY-switch-nodes.patch | 2 +- ...ts-ipq4019-add-ethernet-essedma-node.patch | 2 +- 6 files changed, 109 insertions(+), 6 deletions(-) create mode 100644 target/linux/ipq40xx/patches-4.14/105-pinctrl-msm-fix-gpio-hog-related-boot-issues.patch diff --git a/target/linux/ipq40xx/patches-4.14/105-pinctrl-msm-fix-gpio-hog-related-boot-issues.patch b/target/linux/ipq40xx/patches-4.14/105-pinctrl-msm-fix-gpio-hog-related-boot-issues.patch new file mode 100644 index 0000000000..57ed940fd1 --- /dev/null +++ b/target/linux/ipq40xx/patches-4.14/105-pinctrl-msm-fix-gpio-hog-related-boot-issues.patch @@ -0,0 +1,103 @@ +From: Christian Lamparter +Date: Thu, 12 Apr 2018 21:01:38 +0200 +Subject: [PATCH] pinctrl: msm: fix gpio-hog related boot issues + +Sven Eckelmann reported an issue with the current IPQ4019 pinctrl. +Setting up any gpio-hog in the device-tree for his device would +"kill the bootup completely": + +| [ 0.477838] msm_serial 78af000.serial: could not find pctldev for node /soc/pinctrl@1000000/serial_pinmux, deferring probe +| [ 0.499828] spi_qup 78b5000.spi: could not find pctldev for node /soc/pinctrl@1000000/spi_0_pinmux, deferring probe +| [ 1.298883] requesting hog GPIO enable USB2 power (chip 1000000.pinctrl, offset 58) failed, -517 +| [ 1.299609] gpiochip_add_data: GPIOs 0..99 (1000000.pinctrl) failed to register +| [ 1.308589] ipq4019-pinctrl 1000000.pinctrl: Failed register gpiochip +| [ 1.316586] msm_serial 78af000.serial: could not find pctldev for node /soc/pinctrl@1000000/serial_pinmux, deferring probe +| [ 1.322415] spi_qup 78b5000.spi: could not find pctldev for node /soc/pinctrl@1000000/spi_0_pinmux, deferri + +This was also verified on a RT-AC58U (IPQ4018) which would +no longer boot, if a gpio-hog was specified. (Tried forcing +the USB LED PIN (GPIO0) to high.). + +The problem is that Pinctrl+GPIO registration is currently +peformed in the following order in pinctrl-msm.c: + 1. pinctrl_register() + 2. gpiochip_add() + 3. gpiochip_add_pin_range() + +The actual error code -517 == -EPROBE_DEFER is coming from +pinctrl_get_device_gpio_range(), which is called through: + gpiochip_add + of_gpiochip_add + of_gpiochip_scan_gpios + gpiod_hog + gpiochip_request_own_desc + __gpiod_request + chip->request + gpiochip_generic_request + pinctrl_gpio_request + pinctrl_get_device_gpio_range + +pinctrl_get_device_gpio_range() is unable to find any valid +pin ranges, since nothing has been added to the pinctrldev_list yet. +so the range can't be found, and the operation fails with -EPROBE_DEFER. + +This patch fixes the issue by adding the "gpio-ranges" property to +the pinctrl device node of all upstream Qcom SoC. The pin ranges are +then added by the gpio core. + +In order to remain compatible with older, existing DTs (and ACPI) +a check for the "gpio-ranges" property has been added to +msm_gpio_init(). This prevents the driver of adding the same entry +to the pinctrldev_list twice. + +Reported-by: Sven Eckelmann +Signed-off-by: Christian Lamparter + +Origin: other, https://patchwork.kernel.org/patch/10339127/ +--- + arch/arm/boot/dts/qcom-ipq4019.dtsi | 1 + + drivers/pinctrl/qcom/pinctrl-msm.c | 23 ++++++++++++++++++----- + 14 files changed, 32 insertions(+), 6 deletions(-) + +--- a/arch/arm/boot/dts/qcom-ipq4019.dtsi ++++ b/arch/arm/boot/dts/qcom-ipq4019.dtsi +@@ -166,6 +166,7 @@ + compatible = "qcom,ipq4019-pinctrl"; + reg = <0x01000000 0x300000>; + gpio-controller; ++ gpio-ranges = <&tlmm 0 0 100>; + #gpio-cells = <2>; + interrupt-controller; + #interrupt-cells = <2>; +--- a/drivers/pinctrl/qcom/pinctrl-msm.c ++++ b/drivers/pinctrl/qcom/pinctrl-msm.c +@@ -831,11 +831,24 @@ static int msm_gpio_init(struct msm_pinc + return ret; + } + +- ret = gpiochip_add_pin_range(&pctrl->chip, dev_name(pctrl->dev), 0, 0, chip->ngpio); +- if (ret) { +- dev_err(pctrl->dev, "Failed to add pin range\n"); +- gpiochip_remove(&pctrl->chip); +- return ret; ++ /* ++ * For DeviceTree-supported systems, the gpio core checks the ++ * pinctrl's device node for the "gpio-ranges" property. ++ * If it is present, it takes care of adding the pin ranges ++ * for the driver. In this case the driver can skip ahead. ++ * ++ * In order to remain compatible with older, existing DeviceTree ++ * files which don't set the "gpio-ranges" property or systems that ++ * utilize ACPI the driver has to call gpiochip_add_pin_range(). ++ */ ++ if (!of_property_read_bool(pctrl->dev->of_node, "gpio-ranges")) { ++ ret = gpiochip_add_pin_range(&pctrl->chip, ++ dev_name(pctrl->dev), 0, 0, chip->ngpio); ++ if (ret) { ++ dev_err(pctrl->dev, "Failed to add pin range\n"); ++ gpiochip_remove(&pctrl->chip); ++ return ret; ++ } + } + + ret = gpiochip_irqchip_add(chip, diff --git a/target/linux/ipq40xx/patches-4.14/305-qcom-ipq4019-use-v2-of-the-kpss-bringup-mechanism.patch b/target/linux/ipq40xx/patches-4.14/305-qcom-ipq4019-use-v2-of-the-kpss-bringup-mechanism.patch index 1d08b9de74..ed44359e5f 100644 --- a/target/linux/ipq40xx/patches-4.14/305-qcom-ipq4019-use-v2-of-the-kpss-bringup-mechanism.patch +++ b/target/linux/ipq40xx/patches-4.14/305-qcom-ipq4019-use-v2-of-the-kpss-bringup-mechanism.patch @@ -67,7 +67,7 @@ Changes: qcom,acc = <&acc3>; qcom,saw = <&saw3>; reg = <0x3>; -@@ -264,22 +274,22 @@ +@@ -265,22 +275,22 @@ }; acc0: clock-controller@b088000 { @@ -94,7 +94,7 @@ Changes: reg = <0x0b0b8000 0x1000>, <0xb008000 0x1000>; }; -@@ -307,6 +317,12 @@ +@@ -308,6 +318,12 @@ regulator; }; diff --git a/target/linux/ipq40xx/patches-4.14/306-qcom-ipq4019-add-USB-nodes-to-ipq4019-SoC-device-tre.patch b/target/linux/ipq40xx/patches-4.14/306-qcom-ipq4019-add-USB-nodes-to-ipq4019-SoC-device-tre.patch index cd0f14eafd..33d744251c 100644 --- a/target/linux/ipq40xx/patches-4.14/306-qcom-ipq4019-add-USB-nodes-to-ipq4019-SoC-device-tre.patch +++ b/target/linux/ipq40xx/patches-4.14/306-qcom-ipq4019-add-USB-nodes-to-ipq4019-SoC-device-tre.patch @@ -51,7 +51,7 @@ Changes: }; --- a/arch/arm/boot/dts/qcom-ipq4019.dtsi +++ b/arch/arm/boot/dts/qcom-ipq4019.dtsi -@@ -538,5 +538,76 @@ +@@ -539,5 +539,76 @@ "legacy"; status = "disabled"; }; diff --git a/target/linux/ipq40xx/patches-4.14/701-dts-ipq4019-add-mdio-node.patch b/target/linux/ipq40xx/patches-4.14/701-dts-ipq4019-add-mdio-node.patch index 112c921dbd..25f596eaff 100644 --- a/target/linux/ipq40xx/patches-4.14/701-dts-ipq4019-add-mdio-node.patch +++ b/target/linux/ipq40xx/patches-4.14/701-dts-ipq4019-add-mdio-node.patch @@ -15,7 +15,7 @@ so the info might change. --- a/arch/arm/boot/dts/qcom-ipq4019.dtsi +++ b/arch/arm/boot/dts/qcom-ipq4019.dtsi -@@ -539,6 +539,34 @@ +@@ -540,6 +540,34 @@ status = "disabled"; }; diff --git a/target/linux/ipq40xx/patches-4.14/702-dts-ipq4019-add-PHY-switch-nodes.patch b/target/linux/ipq40xx/patches-4.14/702-dts-ipq4019-add-PHY-switch-nodes.patch index 7ad9edbe99..eb3d9be013 100644 --- a/target/linux/ipq40xx/patches-4.14/702-dts-ipq4019-add-PHY-switch-nodes.patch +++ b/target/linux/ipq40xx/patches-4.14/702-dts-ipq4019-add-PHY-switch-nodes.patch @@ -14,7 +14,7 @@ Signed-off-by: Christian Lamparter --- a/arch/arm/boot/dts/qcom-ipq4019.dtsi +++ b/arch/arm/boot/dts/qcom-ipq4019.dtsi -@@ -567,6 +567,29 @@ +@@ -568,6 +568,29 @@ }; }; diff --git a/target/linux/ipq40xx/patches-4.14/711-dts-ipq4019-add-ethernet-essedma-node.patch b/target/linux/ipq40xx/patches-4.14/711-dts-ipq4019-add-ethernet-essedma-node.patch index 285cafd6d5..2c923625b4 100644 --- a/target/linux/ipq40xx/patches-4.14/711-dts-ipq4019-add-ethernet-essedma-node.patch +++ b/target/linux/ipq40xx/patches-4.14/711-dts-ipq4019-add-ethernet-essedma-node.patch @@ -25,7 +25,7 @@ Signed-off-by: Christian Lamparter }; cpus { -@@ -590,6 +592,64 @@ +@@ -591,6 +593,64 @@ status = "disabled"; }; -- 2.25.1