Produce a dump of the register contents of the I2C controller (at the debug level) whenever an i2c recovery is initiated. Signed-off-by: Ben Gardiner <bengardiner@xxxxxxxxxxxxxx> Cc: Bastian Ruppert <Bastian.Ruppert@xxxxxxxxxx> Cc: Brad Griffis <bgriffis@xxxxxx> Cc: Sekhar Nori <nsekhar@xxxxxx> Cc: Ben Dooks <ben-linux@xxxxxxxxx> --- The motivation for the introduction of this additional debugging information is that when I2C recovery on da850 began discussion in the e2e forums [1] a register dump was requested. [1] http://e2e.ti.com/support/dsp/omap_applications_processors/f/42/p/99895/350610.aspx#350610 drivers/i2c/busses/i2c-davinci.c | 32 ++++++++++++++++++++++++++++++++ 1 files changed, 32 insertions(+), 0 deletions(-) diff --git a/drivers/i2c/busses/i2c-davinci.c b/drivers/i2c/busses/i2c-davinci.c index 5795c83..7011222 100644 --- a/drivers/i2c/busses/i2c-davinci.c +++ b/drivers/i2c/busses/i2c-davinci.c @@ -133,6 +133,37 @@ static inline u16 davinci_i2c_read_reg(struct davinci_i2c_dev *i2c_dev, int reg) return __raw_readw(i2c_dev->base + reg); } +static void i2c_davinci_dump_regs(struct davinci_i2c_dev *dev) +{ + dev_dbg(dev->dev, "PSC = %08x\n", + davinci_i2c_read_reg(dev, DAVINCI_I2C_PSC_REG)); + dev_dbg(dev->dev, "CLKL = %08x\n", + davinci_i2c_read_reg(dev, DAVINCI_I2C_CLKL_REG)); + dev_dbg(dev->dev, "CLKH = %08x\n", + davinci_i2c_read_reg(dev, DAVINCI_I2C_CLKH_REG)); + dev_dbg(dev->dev, "MDR = %08x\n", + davinci_i2c_read_reg(dev, DAVINCI_I2C_MDR_REG)); + + dev_dbg(dev->dev, "OAR = %08x\n", + davinci_i2c_read_reg(dev, DAVINCI_I2C_OAR_REG)); + dev_dbg(dev->dev, "IMR = %08x\n", + davinci_i2c_read_reg(dev, DAVINCI_I2C_IMR_REG)); + dev_dbg(dev->dev, "STR = %08x\n", + davinci_i2c_read_reg(dev, DAVINCI_I2C_STR_REG)); + dev_dbg(dev->dev, "CNT = %08x\n", + davinci_i2c_read_reg(dev, DAVINCI_I2C_CNT_REG)); + dev_dbg(dev->dev, "DRR = %08x\n", + davinci_i2c_read_reg(dev, DAVINCI_I2C_DRR_REG)); + dev_dbg(dev->dev, "SAR = %08x\n", + davinci_i2c_read_reg(dev, DAVINCI_I2C_SAR_REG)); + dev_dbg(dev->dev, "DXR = %08x\n", + davinci_i2c_read_reg(dev, DAVINCI_I2C_DXR_REG)); + dev_dbg(dev->dev, "IVR = %08x\n", + davinci_i2c_read_reg(dev, DAVINCI_I2C_IVR_REG)); + dev_dbg(dev->dev, "EMDR = %08x\n", + davinci_i2c_read_reg(dev, DAVINCI_I2C_EMDR_REG)); +} + /* Generate a pulse on the i2c clock pin. */ static void generic_i2c_clock_pulse(unsigned int scl_pin) { @@ -157,6 +188,7 @@ static void i2c_recover_bus(struct davinci_i2c_dev *dev) u32 flag = 0; struct davinci_i2c_platform_data *pdata = dev->dev->platform_data; + i2c_davinci_dump_regs(dev); dev_err(dev->dev, "initiating i2c bus recovery\n"); /* Send NACK to the slave */ flag = davinci_i2c_read_reg(dev, DAVINCI_I2C_MDR_REG); -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
