diff options
Diffstat (limited to 'meta-openbmc-mods/meta-ast2600/recipes-bsp/u-boot/files/0037-Enable-I2C-clock-stretching-and-multi-master-support.patch')
| -rw-r--r-- | meta-openbmc-mods/meta-ast2600/recipes-bsp/u-boot/files/0037-Enable-I2C-clock-stretching-and-multi-master-support.patch | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/meta-openbmc-mods/meta-ast2600/recipes-bsp/u-boot/files/0037-Enable-I2C-clock-stretching-and-multi-master-support.patch b/meta-openbmc-mods/meta-ast2600/recipes-bsp/u-boot/files/0037-Enable-I2C-clock-stretching-and-multi-master-support.patch new file mode 100644 index 000000000..014915772 --- /dev/null +++ b/meta-openbmc-mods/meta-ast2600/recipes-bsp/u-boot/files/0037-Enable-I2C-clock-stretching-and-multi-master-support.patch @@ -0,0 +1,143 @@ +From 292700faccff983b60a6bf210af36d9bf7a0ac1a Mon Sep 17 00:00:00 2001 +From: Jan Sowinski <jan.sowinski@intel.com> +Date: Fri, 15 Oct 2021 23:34:10 +0200 +Subject: [PATCH] Enable I2C clock stretching and multi-master support for + AST2600 + +Enabled I2C clock stretching by default to +improve general compatibility with various devices. + +Added support for multi-master mode enabled with +"multi-master" property set in DTS for every i2c node. + +Signed-off-by: Jan Sowinski <jan.sowinski@intel.com> +--- + arch/arm/dts/ast2600-intel.dts | 8 ++++++++ + drivers/i2c/ast_i2c.c | 19 ++++++++++++------- + 2 files changed, 20 insertions(+), 7 deletions(-) + +diff --git a/arch/arm/dts/ast2600-intel.dts b/arch/arm/dts/ast2600-intel.dts +index a76193716d..dba62fd254 100644 +--- a/arch/arm/dts/ast2600-intel.dts ++++ b/arch/arm/dts/ast2600-intel.dts +@@ -168,6 +168,7 @@ + + &i2c4 { + status = "okay"; ++ multi-master; + + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_i2c5_default>; +@@ -175,6 +176,7 @@ + + &i2c5 { + status = "okay"; ++ multi-master; + + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_i2c6_default>; +@@ -182,6 +184,7 @@ + + &i2c6 { + status = "okay"; ++ multi-master; + + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_i2c7_default>; +@@ -189,6 +192,7 @@ + + &i2c7 { + status = "okay"; ++ multi-master; + + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_i2c8_default>; +@@ -196,6 +200,7 @@ + + &i2c8 { + status = "okay"; ++ multi-master; + + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_i2c9_default>; +@@ -203,6 +208,7 @@ + + &i2c9 { + status = "okay"; ++ multi-master; + + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_i2c10_default>; +@@ -210,6 +216,7 @@ + + &i2c12 { + status = "okay"; ++ multi-master; + + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_i2c13_default>; +@@ -217,6 +224,7 @@ + + &i2c13 { + status = "okay"; ++ multi-master; + + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_i2c14_default>; +diff --git a/drivers/i2c/ast_i2c.c b/drivers/i2c/ast_i2c.c +index bbc32d6cdb..974641220b 100644 +--- a/drivers/i2c/ast_i2c.c ++++ b/drivers/i2c/ast_i2c.c +@@ -31,6 +31,8 @@ struct ast_i2c_priv { + struct ast_i2c_regs *regs; + /* I2C speed in Hz */ + int speed; ++ /* Multi-master mode */ ++ bool multi_master; + }; + + /* +@@ -67,14 +69,14 @@ static void ast_i2c_clear_interrupts(struct udevice *dev) + static void ast_i2c_init_bus(struct udevice *dev) + { + struct ast_i2c_priv *priv = dev_get_priv(dev); ++ u32 fun_ctrl_reg = I2CD_MASTER_EN; + + /* Reset device */ + writel(0, &priv->regs->fcr); +- /* Enable Master Mode. Assuming single-master */ +- writel(I2CD_MASTER_EN +- | I2CD_M_SDA_LOCK_EN +- | I2CD_MULTI_MASTER_DIS | I2CD_M_SCL_DRIVE_EN, +- &priv->regs->fcr); ++ /* Enable Single-Master or Multi-Master Mode. */ ++ if (!priv->multi_master) ++ fun_ctrl_reg |= I2CD_MULTI_MASTER_DIS; ++ writel(fun_ctrl_reg, &priv->regs->fcr); + /* Enable Interrupts */ + writel(I2CD_INTR_TX_ACK + | I2CD_INTR_TX_NAK +@@ -100,6 +102,9 @@ static int ast_i2c_ofdata_to_platdata(struct udevice *dev) + return ret; + } + ++ if (dev_read_bool(dev, "multi-master")) ++ priv->multi_master = true; ++ + return 0; + } + +@@ -246,8 +251,8 @@ static int ast_i2c_deblock(struct udevice *dev) + bool scl_high = csr & I2CD_SCL_LINE_STS; + int ret = 0; + +- if (sda_high && scl_high) { +- /* Bus is idle, no deblocking needed. */ ++ if ((sda_high && scl_high) || priv->multi_master) { ++ /* Bus is idle or multi-master mode enabled, no deblocking needed. */ + return 0; + } else if (sda_high) { + /* Send stop command */ +-- +2.25.1 + |