From 5e47eec00425830bfaf30f80a1a4f603dc60ae93 Mon Sep 17 00:00:00 2001 From: Andreas Werner Date: Sun, 17 Nov 2013 18:46:20 +0100 Subject: [PATCH] i2c: i2c-eg20t: do not print error message in syslog if no ACK received Using the i2c-eg20t driver and call i2cdetect or probe on the bus, the driver will print a lot of error messages if there was no ACK received. i2cdetect normally print a table with all the available devices. If there is no device on the address, the table will be empty. Currently with the i2c-eg20t driver, the table is not visible because the error messages destroy the table. Error message: pch_i2c_getack return -71 This patch prevent the driver to print the messages to syslog. The pch_i2c_wait_for_check_xfer function is the only one who is calling pch_i2c_getack, so we can delete the function and add the read to pch_i2c_wait_for_check_xfer. If no ACK is received, the Message will be printed as a dbg message. Fixed print message to be a one liner so we can grep for the error message. Tested on Intel Atom E6xx and Eg20t Chipset. Signed-off-by: Andreas Werner Signed-off-by: Wolfram Sang --- drivers/i2c/busses/i2c-eg20t.c | 26 ++++---------------------- 1 file changed, 4 insertions(+), 22 deletions(-) diff --git a/drivers/i2c/busses/i2c-eg20t.c b/drivers/i2c/busses/i2c-eg20t.c index 0f3752967c4b..ff15ae90aaf5 100644 --- a/drivers/i2c/busses/i2c-eg20t.c +++ b/drivers/i2c/busses/i2c-eg20t.c @@ -311,24 +311,6 @@ static void pch_i2c_start(struct i2c_algo_pch_data *adap) pch_setbit(adap->pch_base_address, PCH_I2CCTL, PCH_START); } -/** - * pch_i2c_getack() - to confirm ACK/NACK - * @adap: Pointer to struct i2c_algo_pch_data. - */ -static s32 pch_i2c_getack(struct i2c_algo_pch_data *adap) -{ - u32 reg_val; - void __iomem *p = adap->pch_base_address; - reg_val = ioread32(p + PCH_I2CSR) & PCH_GETACK; - - if (reg_val != 0) { - pch_err(adap, "return%d\n", -EPROTO); - return -EPROTO; - } - - return 0; -} - /** * pch_i2c_stop() - generate stop condition in normal mode. * @adap: Pointer to struct i2c_algo_pch_data. @@ -344,6 +326,7 @@ static void pch_i2c_stop(struct i2c_algo_pch_data *adap) static int pch_i2c_wait_for_check_xfer(struct i2c_algo_pch_data *adap) { long ret; + void __iomem *p = adap->pch_base_address; ret = wait_event_timeout(pch_event, (adap->pch_event_flag != 0), msecs_to_jiffies(1000)); @@ -366,10 +349,9 @@ static int pch_i2c_wait_for_check_xfer(struct i2c_algo_pch_data *adap) adap->pch_event_flag = 0; - if (pch_i2c_getack(adap)) { - pch_dbg(adap, "Receive NACK for slave address" - "setting\n"); - return -EIO; + if (ioread32(p + PCH_I2CSR) & PCH_GETACK) { + pch_dbg(adap, "Receive NACK for slave address setting\n"); + return -ENXIO; } return 0; -- 2.20.1