diff options
Diffstat (limited to 'meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0043-char-ipmi-Add-clock-control-logic-into-Aspeed-LPC-BT.patch')
| -rw-r--r-- | meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0043-char-ipmi-Add-clock-control-logic-into-Aspeed-LPC-BT.patch | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0043-char-ipmi-Add-clock-control-logic-into-Aspeed-LPC-BT.patch b/meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0043-char-ipmi-Add-clock-control-logic-into-Aspeed-LPC-BT.patch new file mode 100644 index 000000000..f04824c0e --- /dev/null +++ b/meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0043-char-ipmi-Add-clock-control-logic-into-Aspeed-LPC-BT.patch @@ -0,0 +1,140 @@ +From d82aacea62f2cc3f5c4f6654bd8920255edf24fd Mon Sep 17 00:00:00 2001 +From: Jae Hyun Yoo <jae.hyun.yoo@intel.com> +Date: Wed, 13 Mar 2019 15:04:16 -0700 +Subject: [PATCH] char: ipmi: Add clock control logic into Aspeed LPC BT driver + +If LPC BT driver is registered ahead of lpc-ctrl module, LPC BT +block will be enabled without heart beating of LCLK until lpc-ctrl +enables the LCLK. This issue causes improper handling on host +interrupts when the host sends interrupt in that time frame. Then +kernel eventually forcibly disables the interrupt with dumping +stack and printing a 'nobody cared this irq' message out. + +To prevent this issue, all LPC sub-nodes should enable LCLK +individually so this patch adds clock control logic into the LPC +BT driver. + +Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@intel.com> +--- + .../bindings/ipmi/aspeed,ast2400-ibt-bmc.txt | 3 +++ + arch/arm/boot/dts/aspeed-g4.dtsi | 1 + + arch/arm/boot/dts/aspeed-g5.dtsi | 1 + + drivers/char/ipmi/bt-bmc.c | 24 +++++++++++++++++++++- + 4 files changed, 28 insertions(+), 1 deletion(-) + +diff --git a/Documentation/devicetree/bindings/ipmi/aspeed,ast2400-ibt-bmc.txt b/Documentation/devicetree/bindings/ipmi/aspeed,ast2400-ibt-bmc.txt +index 028268fd99ee..d13887d60f19 100644 +--- a/Documentation/devicetree/bindings/ipmi/aspeed,ast2400-ibt-bmc.txt ++++ b/Documentation/devicetree/bindings/ipmi/aspeed,ast2400-ibt-bmc.txt +@@ -10,6 +10,8 @@ Required properties: + "aspeed,ast2400-ibt-bmc" + "aspeed,ast2500-ibt-bmc" + - reg: physical address and size of the registers ++- clocks: contains a phandle to the syscon node describing the clocks. ++ There should then be one cell representing the clock to use. + + Optional properties: + +@@ -22,4 +24,5 @@ Example: + compatible = "aspeed,ast2400-ibt-bmc"; + reg = <0x1e789140 0x18>; + interrupts = <8>; ++ clocks = <&syscon ASPEED_CLK_GATE_LCLK>; + }; +diff --git a/arch/arm/boot/dts/aspeed-g4.dtsi b/arch/arm/boot/dts/aspeed-g4.dtsi +index 6e6f50a0fbab..3a7e31f3de07 100644 +--- a/arch/arm/boot/dts/aspeed-g4.dtsi ++++ b/arch/arm/boot/dts/aspeed-g4.dtsi +@@ -333,6 +333,7 @@ + ibt: ibt@c0 { + compatible = "aspeed,ast2400-ibt-bmc"; + reg = <0xc0 0x18>; ++ clocks = <&syscon ASPEED_CLK_GATE_LCLK>; + interrupts = <8>; + }; + +diff --git a/arch/arm/boot/dts/aspeed-g5.dtsi b/arch/arm/boot/dts/aspeed-g5.dtsi +index 4cd4a8258e42..a6720bc952b0 100644 +--- a/arch/arm/boot/dts/aspeed-g5.dtsi ++++ b/arch/arm/boot/dts/aspeed-g5.dtsi +@@ -468,6 +468,7 @@ + ibt: ibt@c0 { + compatible = "aspeed,ast2500-ibt-bmc"; + reg = <0xc0 0x18>; ++ clocks = <&syscon ASPEED_CLK_GATE_LCLK>; + interrupts = <8>; + }; + +diff --git a/drivers/char/ipmi/bt-bmc.c b/drivers/char/ipmi/bt-bmc.c +index 40b9927c072c..a4ec9d1743d7 100644 +--- a/drivers/char/ipmi/bt-bmc.c ++++ b/drivers/char/ipmi/bt-bmc.c +@@ -5,6 +5,7 @@ + + #include <linux/atomic.h> + #include <linux/bt-bmc.h> ++#include <linux/clk.h> + #include <linux/errno.h> + #include <linux/interrupt.h> + #include <linux/io.h> +@@ -60,6 +61,7 @@ struct bt_bmc { + struct device dev; + struct miscdevice miscdev; + struct regmap *map; ++ struct clk *clk; + int offset; + int irq; + wait_queue_head_t queue; +@@ -467,6 +469,19 @@ static int bt_bmc_probe(struct platform_device *pdev) + mutex_init(&bt_bmc->mutex); + init_waitqueue_head(&bt_bmc->queue); + ++ bt_bmc->clk = devm_clk_get(dev, NULL); ++ if (IS_ERR(bt_bmc->clk)) { ++ rc = PTR_ERR(bt_bmc->clk); ++ if (rc != -EPROBE_DEFER) ++ dev_err(dev, "couldn't get clock\n"); ++ return rc; ++ } ++ rc = clk_prepare_enable(bt_bmc->clk); ++ if (rc) { ++ dev_err(dev, "couldn't enable clock\n"); ++ return rc; ++ } ++ + bt_bmc->miscdev.minor = MISC_DYNAMIC_MINOR, + bt_bmc->miscdev.name = DEVICE_NAME, + bt_bmc->miscdev.fops = &bt_bmc_fops, +@@ -474,7 +489,7 @@ static int bt_bmc_probe(struct platform_device *pdev) + rc = misc_register(&bt_bmc->miscdev); + if (rc) { + dev_err(dev, "Unable to register misc device\n"); +- return rc; ++ goto err; + } + + bt_bmc_config_irq(bt_bmc, pdev); +@@ -498,6 +513,11 @@ static int bt_bmc_probe(struct platform_device *pdev) + clr_b_busy(bt_bmc); + + return 0; ++ ++err: ++ clk_disable_unprepare(bt_bmc->clk); ++ ++ return rc; + } + + static int bt_bmc_remove(struct platform_device *pdev) +@@ -507,6 +527,8 @@ static int bt_bmc_remove(struct platform_device *pdev) + misc_deregister(&bt_bmc->miscdev); + if (!bt_bmc->irq) + del_timer_sync(&bt_bmc->poll_timer); ++ clk_disable_unprepare(bt_bmc->clk); ++ + return 0; + } + +-- +2.7.4 + |