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Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0142-FIXUP-i2c_bcm2708-Don-t-change-module-baudrate-param.patch')
-rw-r--r--target/linux/brcm2708/patches-4.4/0142-FIXUP-i2c_bcm2708-Don-t-change-module-baudrate-param.patch99
1 files changed, 99 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0142-FIXUP-i2c_bcm2708-Don-t-change-module-baudrate-param.patch b/target/linux/brcm2708/patches-4.4/0142-FIXUP-i2c_bcm2708-Don-t-change-module-baudrate-param.patch
new file mode 100644
index 0000000000..e2f4ba46ac
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.4/0142-FIXUP-i2c_bcm2708-Don-t-change-module-baudrate-param.patch
@@ -0,0 +1,99 @@
+From 3b0e6758d12a326405c257fe074dab570b1de92e Mon Sep 17 00:00:00 2001
+From: Phil Elwell <phil@raspberrypi.org>
+Date: Tue, 19 Jan 2016 16:28:05 +0000
+Subject: [PATCH 142/156] FIXUP i2c_bcm2708: Don't change module baudrate
+ parameter
+
+Overwriting the baudrate module parameter creates an apparent
+forced baudrate for i2c busses after the first. Not only does this
+override the baudrate from DT it also prevents the bus ID from
+being initialised.
+
+Also fix whitespace errors.
+---
+ drivers/i2c/busses/i2c-bcm2708.c | 48 +++++++++++++++++++++-------------------
+ 1 file changed, 25 insertions(+), 23 deletions(-)
+
+--- a/drivers/i2c/busses/i2c-bcm2708.c
++++ b/drivers/i2c/busses/i2c-bcm2708.c
+@@ -71,7 +71,6 @@
+
+ #define DRV_NAME "bcm2708_i2c"
+
+-static unsigned int baudrate_default = CONFIG_I2C_BCM2708_BAUDRATE;
+ static unsigned int baudrate;
+ module_param(baudrate, uint, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
+ MODULE_PARM_DESC(baudrate, "The I2C baudrate");
+@@ -317,25 +316,28 @@ static int bcm2708_i2c_probe(struct plat
+ struct i2c_adapter *adap;
+ unsigned long bus_hz;
+ u32 cdiv, clk_tout;
+-
+- if (!baudrate) {
+- baudrate = baudrate_default;
+- if (pdev->dev.of_node) {
+- u32 bus_clk_rate;
+- pdev->id = of_alias_get_id(pdev->dev.of_node, "i2c");
+- if (pdev->id < 0) {
+- dev_err(&pdev->dev, "alias is missing\n");
+- return -EINVAL;
+- }
+- if (!of_property_read_u32(pdev->dev.of_node,
+- "clock-frequency", &bus_clk_rate))
+- baudrate = bus_clk_rate;
+- else
+- dev_warn(&pdev->dev,
+- "Could not read clock-frequency property\n");
++ u32 baud;
++
++ baud = CONFIG_I2C_BCM2708_BAUDRATE;
++
++ if (pdev->dev.of_node) {
++ u32 bus_clk_rate;
++ pdev->id = of_alias_get_id(pdev->dev.of_node, "i2c");
++ if (pdev->id < 0) {
++ dev_err(&pdev->dev, "alias is missing\n");
++ return -EINVAL;
+ }
++ if (!of_property_read_u32(pdev->dev.of_node,
++ "clock-frequency", &bus_clk_rate))
++ baud = bus_clk_rate;
++ else
++ dev_warn(&pdev->dev,
++ "Could not read clock-frequency property\n");
+ }
+
++ if (baudrate)
++ baud = baudrate;
++
+ regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!regs) {
+ dev_err(&pdev->dev, "could not get IO memory\n");
+@@ -419,21 +421,21 @@ static int bcm2708_i2c_probe(struct plat
+ }
+
+ bus_hz = clk_get_rate(bi->clk);
+- cdiv = bus_hz / baudrate;
++ cdiv = bus_hz / baud;
+ if (cdiv > 0xffff) {
+ cdiv = 0xffff;
+- baudrate = bus_hz / cdiv;
++ baud = bus_hz / cdiv;
+ }
+-
+- clk_tout = 35/1000*baudrate; //35ms timeout as per SMBus specs.
+- if (clk_tout > 0xffff)
++
++ clk_tout = 35/1000*baud; //35ms timeout as per SMBus specs.
++ if (clk_tout > 0xffff)
+ clk_tout = 0xffff;
+
+ bi->cdiv = cdiv;
+ bi->clk_tout = clk_tout;
+
+ dev_info(&pdev->dev, "BSC%d Controller at 0x%08lx (irq %d) (baudrate %d)\n",
+- pdev->id, (unsigned long)regs->start, irq, baudrate);
++ pdev->id, (unsigned long)regs->start, irq, baud);
+
+ return 0;
+