From 225376f0a37ee9b6f20626e5f377d8833ea1727f Mon Sep 17 00:00:00 2001 From: Ed Tanous Date: Mon, 18 Mar 2019 13:46:22 -0700 Subject: Update to internal Signed-off-by: Ed Tanous --- ...eout-ms-and-retries-device-tree-propertie.patch | 105 +++++++++++++++++++++ 1 file changed, 105 insertions(+) create mode 100644 meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0042-Add-bus-timeout-ms-and-retries-device-tree-propertie.patch (limited to 'meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0042-Add-bus-timeout-ms-and-retries-device-tree-propertie.patch') diff --git a/meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0042-Add-bus-timeout-ms-and-retries-device-tree-propertie.patch b/meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0042-Add-bus-timeout-ms-and-retries-device-tree-propertie.patch new file mode 100644 index 000000000..901d63645 --- /dev/null +++ b/meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0042-Add-bus-timeout-ms-and-retries-device-tree-propertie.patch @@ -0,0 +1,105 @@ +From ca4f6555620212ffccd943ea4c58e7ee7b1b0571 Mon Sep 17 00:00:00 2001 +From: Jae Hyun Yoo +Date: Thu, 7 Mar 2019 15:17:40 -0800 +Subject: [PATCH] Add bus-timeout-ms and #retries device tree properties + +BMC uses I2C bus 7 as a PMBus channel to communicate with PSUs, +also ME uses this bus as SMLink to control PSUs so this bus is +managed by multi-masters. In this use case, some arbitration errors +are expected so we need to add retry logic. And PMBus subsystem +uses I2C bus in kernel internally so retry logic should be +supported in kernel level. + +To support the use case, this commit adds 'bus-timeout-ms' and +'#retries' device tree properties to set the bus specific +parameters at kernel boot time without using any additional ioctls +from user space. + +This patch would not be accepted by I2C maintainer in linux +upstream because he doesn't like adding these legacy properties +into device tree, so keep it only in downstream. + +Signed-off-by: Jae Hyun Yoo +--- + Documentation/devicetree/bindings/i2c/i2c-aspeed.txt | 3 +++ + Documentation/devicetree/bindings/i2c/i2c.txt | 6 ++++++ + drivers/i2c/busses/i2c-aspeed.c | 1 - + drivers/i2c/i2c-core-base.c | 12 ++++++++++-- + 4 files changed, 19 insertions(+), 3 deletions(-) + +diff --git a/Documentation/devicetree/bindings/i2c/i2c-aspeed.txt b/Documentation/devicetree/bindings/i2c/i2c-aspeed.txt +index 8fbd8633a387..7da7e813b2b0 100644 +--- a/Documentation/devicetree/bindings/i2c/i2c-aspeed.txt ++++ b/Documentation/devicetree/bindings/i2c/i2c-aspeed.txt +@@ -16,6 +16,9 @@ Optional Properties: + - bus-frequency : frequency of the bus clock in Hz defaults to 100 kHz when not + specified + - multi-master : states that there is another master active on this bus. ++- bus-timeout-ms: bus timeout in milliseconds defaults to 1 second when not ++ specified. ++- #retries : Number of retries for master transfer. + + Example: + +diff --git a/Documentation/devicetree/bindings/i2c/i2c.txt b/Documentation/devicetree/bindings/i2c/i2c.txt +index 11263982470e..bdead91f82a4 100644 +--- a/Documentation/devicetree/bindings/i2c/i2c.txt ++++ b/Documentation/devicetree/bindings/i2c/i2c.txt +@@ -80,6 +80,12 @@ wants to support one of the below features, it should adapt the bindings below. + Names of map programmable addresses. + It can contain any map needing another address than default one. + ++- bus-timeout-ms ++ Bus timeout in milliseconds. ++ ++- #retries ++ Number of retries for master transfer. ++ + Binding may contain optional "interrupts" property, describing interrupts + used by the device. I2C core will assign "irq" interrupt (or the very first + interrupt if not using interrupt names) as primary interrupt for the slave. +diff --git a/drivers/i2c/busses/i2c-aspeed.c b/drivers/i2c/busses/i2c-aspeed.c +index 506d867b43d9..84237c5d0aca 100644 +--- a/drivers/i2c/busses/i2c-aspeed.c ++++ b/drivers/i2c/busses/i2c-aspeed.c +@@ -1012,7 +1012,6 @@ static int aspeed_i2c_probe_bus(struct platform_device *pdev) + spin_lock_init(&bus->lock); + init_completion(&bus->cmd_complete); + bus->adap.owner = THIS_MODULE; +- bus->adap.retries = 0; + bus->adap.algo = &aspeed_i2c_algo; + bus->adap.dev.parent = &pdev->dev; + bus->adap.dev.of_node = pdev->dev.of_node; +diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c +index 728b818501b1..17cf0fb037ac 100644 +--- a/drivers/i2c/i2c-core-base.c ++++ b/drivers/i2c/i2c-core-base.c +@@ -1232,6 +1232,7 @@ static void i2c_adapter_hold_timer_callback(struct timer_list *t) + + static int i2c_register_adapter(struct i2c_adapter *adap) + { ++ u32 bus_timeout_ms = 0; + int res = -EINVAL; + + /* Can't register until after driver model init */ +@@ -1258,8 +1259,15 @@ static int i2c_register_adapter(struct i2c_adapter *adap) + INIT_LIST_HEAD(&adap->userspace_clients); + + /* Set default timeout to 1 second if not already set */ +- if (adap->timeout == 0) +- adap->timeout = HZ; ++ if (adap->timeout == 0) { ++ device_property_read_u32(&adap->dev, "bus-timeout-ms", ++ &bus_timeout_ms); ++ adap->timeout = bus_timeout_ms ? ++ msecs_to_jiffies(bus_timeout_ms) : HZ; ++ } ++ ++ /* Set retries count if it has the property setting */ ++ device_property_read_u32(&adap->dev, "#retries", &adap->retries); + + /* register soft irqs for Host Notify */ + res = i2c_setup_host_notify_irq_domain(adap); +-- +2.7.4 + -- cgit v1.2.3