diff options
Diffstat (limited to 'meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0044-misc-Add-clock-control-logic-into-Aspeed-LPC-SNOOP-d.patch')
| -rw-r--r-- | meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0044-misc-Add-clock-control-logic-into-Aspeed-LPC-SNOOP-d.patch | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0044-misc-Add-clock-control-logic-into-Aspeed-LPC-SNOOP-d.patch b/meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0044-misc-Add-clock-control-logic-into-Aspeed-LPC-SNOOP-d.patch new file mode 100644 index 000000000..b3ace73f6 --- /dev/null +++ b/meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0044-misc-Add-clock-control-logic-into-Aspeed-LPC-SNOOP-d.patch @@ -0,0 +1,139 @@ +From 404f73827714e324a21250b1a855fdc10fcfaf51 Mon Sep 17 00:00:00 2001 +From: Jae Hyun Yoo <jae.hyun.yoo@intel.com> +Date: Wed, 13 Mar 2019 15:27:48 -0700 +Subject: [PATCH] misc: Add clock control logic into Aspeed LPC SNOOP driver + +If LPC SNOOP driver is registered ahead of lpc-ctrl module, LPC +SNOOP 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 +SNOOP driver. + +Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@intel.com> +Signed-off-by: Vernon Mauery <vernon.mauery@linux.intel.com> +--- + arch/arm/boot/dts/aspeed-g4.dtsi | 1 + + arch/arm/boot/dts/aspeed-g5.dtsi | 1 + + arch/arm/boot/dts/aspeed-g6.dtsi | 1 + + drivers/soc/aspeed/aspeed-lpc-snoop.c | 30 +++++++++++++++++++++++++++--- + 4 files changed, 30 insertions(+), 3 deletions(-) + +diff --git a/arch/arm/boot/dts/aspeed-g4.dtsi b/arch/arm/boot/dts/aspeed-g4.dtsi +index db962ab435af..24a20384b5e8 100644 +--- a/arch/arm/boot/dts/aspeed-g4.dtsi ++++ b/arch/arm/boot/dts/aspeed-g4.dtsi +@@ -369,6 +369,7 @@ + compatible = "aspeed,ast2400-lpc-snoop"; + reg = <0x0 0x80>; + interrupts = <8>; ++ clocks = <&syscon ASPEED_CLK_GATE_LCLK>; + status = "disabled"; + }; + +diff --git a/arch/arm/boot/dts/aspeed-g5.dtsi b/arch/arm/boot/dts/aspeed-g5.dtsi +index c4724ec27041..18d2a465c0ed 100644 +--- a/arch/arm/boot/dts/aspeed-g5.dtsi ++++ b/arch/arm/boot/dts/aspeed-g5.dtsi +@@ -482,6 +482,7 @@ + compatible = "aspeed,ast2500-lpc-snoop"; + reg = <0x0 0x80>; + interrupts = <8>; ++ clocks = <&syscon ASPEED_CLK_GATE_LCLK>; + status = "disabled"; + }; + +diff --git a/arch/arm/boot/dts/aspeed-g6.dtsi b/arch/arm/boot/dts/aspeed-g6.dtsi +index a557a7e6fe8d..4035d7bd647e 100644 +--- a/arch/arm/boot/dts/aspeed-g6.dtsi ++++ b/arch/arm/boot/dts/aspeed-g6.dtsi +@@ -507,6 +507,7 @@ + compatible = "aspeed,ast2600-lpc-snoop"; + reg = <0x0 0x80>; + interrupts = <GIC_SPI 144 IRQ_TYPE_LEVEL_HIGH>; ++ clocks = <&syscon ASPEED_CLK_GATE_LCLK>; + status = "disabled"; + }; + +diff --git a/drivers/soc/aspeed/aspeed-lpc-snoop.c b/drivers/soc/aspeed/aspeed-lpc-snoop.c +index c7b4ac066b40..ed272677fc82 100644 +--- a/drivers/soc/aspeed/aspeed-lpc-snoop.c ++++ b/drivers/soc/aspeed/aspeed-lpc-snoop.c +@@ -11,6 +11,7 @@ + */ + + #include <linux/bitops.h> ++#include <linux/clk.h> + #include <linux/interrupt.h> + #include <linux/fs.h> + #include <linux/kfifo.h> +@@ -67,6 +68,7 @@ struct aspeed_lpc_snoop_channel { + struct aspeed_lpc_snoop { + struct regmap *regmap; + int irq; ++ struct clk *clk; + struct aspeed_lpc_snoop_channel chan[NUM_SNOOP_CHANNELS]; + }; + +@@ -282,22 +284,42 @@ static int aspeed_lpc_snoop_probe(struct platform_device *pdev) + return -ENODEV; + } + ++ lpc_snoop->clk = devm_clk_get(dev, NULL); ++ if (IS_ERR(lpc_snoop->clk)) { ++ rc = PTR_ERR(lpc_snoop->clk); ++ if (rc != -EPROBE_DEFER) ++ dev_err(dev, "couldn't get clock\n"); ++ return rc; ++ } ++ rc = clk_prepare_enable(lpc_snoop->clk); ++ if (rc) { ++ dev_err(dev, "couldn't enable clock\n"); ++ return rc; ++ } ++ + rc = aspeed_lpc_snoop_config_irq(lpc_snoop, pdev); + if (rc) +- return rc; ++ goto err; + + rc = aspeed_lpc_enable_snoop(lpc_snoop, dev, 0, port); + if (rc) +- return rc; ++ goto err; + + /* Configuration of 2nd snoop channel port is optional */ + if (of_property_read_u32_index(dev->of_node, "snoop-ports", + 1, &port) == 0) { + rc = aspeed_lpc_enable_snoop(lpc_snoop, dev, 1, port); +- if (rc) ++ if (rc) { + aspeed_lpc_disable_snoop(lpc_snoop, 0); ++ goto err; ++ } + } + ++ return 0; ++ ++err: ++ clk_disable_unprepare(lpc_snoop->clk); ++ + return rc; + } + +@@ -309,6 +331,8 @@ static int aspeed_lpc_snoop_remove(struct platform_device *pdev) + aspeed_lpc_disable_snoop(lpc_snoop, 0); + aspeed_lpc_disable_snoop(lpc_snoop, 1); + ++ clk_disable_unprepare(lpc_snoop->clk); ++ + return 0; + } + +-- +2.7.4 + |