* Kevin Hilman <khilman@xxxxxxxxxx> [141126 13:27]: > Alexander Kochetkov <al.kochet@xxxxxxxxx> writes: > > > NOT FOR UPSTREAM > > > > The patch checks if IP reset during probe could bring I2C bus > > to a free state on omap2430 - omap3530 boards. > > > > I guess, IP hold one of I2C lines in a low state. > > I guess, u-boot haven't sent a stop condition. > > > > The patch is rebased on branch 'i2c/for-next' of > > git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux > > (6e79807443cba7397cd855ed29d6faba51d4c893) > > > > Signed-off-by: Alexander Kochetkov <al.kochet@xxxxxxxxx> > > Reported-by: Kevin Hilman <khilman@xxxxxxxxxx> > > Tested-by: Kevin Hilman <khilman@xxxxxxxxxx> > > Built for omap2plus_defconfig and tested on all my OMAP boards. Results > here: > > http://people.linaro.org/~khilman/tmp/next-20141126-1-g760388ee02e4/arm-omap2plus_defconfig/ And below is the output from 2430sdp with linux next plus Alexander's test patch. Looks like for some time 2430 i2c has not been behaving reliably unless I force compatible to ti,omap2420-i2c instead of ti,omap2430-i2c.. The output below is with ti,omap2430-i2c. Regards, Tony 8< ------------- [ 0.913574] omap_i2c 48070000.i2c: init0: STAT=0x0000; IE=0x601f; CON=0x8000; SYSTEST=0x0000; SDA=00 [OI]; SCL=00 [OI] (omap_i2c_init:493) [ 1.931365] omap_i2c 48070000.i2c: timeout waiting for bus ready [ 1.931457] omap_i2c 48070000.i2c: init1: STAT=0x0000; IE=0x601f; CON=0x8000; SYSTEST=0x0000; SDA=00 [OI]; SCL=00 [OI] (omap_i2c_init:497) [ 1.931518] omap_i2c 48070000.i2c: init1: bb_valid=0 [ 2.949249] omap_i2c 48070000.i2c: timeout waiting for bus ready [ 2.949340] omap_i2c 48070000.i2c: init2: STAT=0x0000; IE=0x601f; CON=0x8000; SYSTEST=0x0000; SDA=00 [OI]; SCL=00 [OI] (omap_i2c_init:504) [ 2.949401] omap_i2c 48070000.i2c: init2: bb_valid=0 [ 2.952941] omap_i2c 48070000.i2c: bus 0 rev3.3 at 100 kHz (rev 00000036) [ 2.969299] omap_i2c 48072000.i2c: init0: STAT=0x0000; IE=0x601f; CON=0x8000; SYSTEST=0x0000; SDA=00 [OI]; SCL=00 [OI] (omap_i2c_init:493) [ 3.987091] omap_i2c 48072000.i2c: timeout waiting for bus ready [ 3.987182] omap_i2c 48072000.i2c: init1: STAT=0x0000; IE=0x601f; CON=0x8000; SYSTEST=0x0000; SDA=00 [OI]; SCL=00 [OI] (omap_i2c_init:497) [ 3.987243] omap_i2c 48072000.i2c: init1: bb_valid=0 [ 5.004974] omap_i2c 48072000.i2c: timeout waiting for bus ready [ 5.005096] omap_i2c 48072000.i2c: init2: STAT=0x0000; IE=0x601f; CON=0x8000; SYSTEST=0x0000; SDA=00 [OI]; SCL=00 [OI] (omap_i2c_init:504) [ 5.005126] omap_i2c 48072000.i2c: init2: bb_valid=0 [ 5.017517] omap_i2c 48072000.i2c: bus 1 rev3.3 at 100 kHz (rev 00000036) [ 7.555419] twl4030_keypad 48072000.i2c:twl@48:keypad: OF: linux,keymap property not defined in /ocp/i2c@48072000/twl@48/keypad [ 7.567626] twl4030_keypad 48072000.i2c:twl@48:keypad: Failed to build keymap [ 7.575439] twl4030_keypad: probe of 48072000.i2c:twl@48:keypad failed with error -2 [ 7.599639] input: twl4030_pwrbutton as /devices/platform/ocp/48072000.i2c/i2c-1/1-0048/48072000.i2c:twl@48:pwrbutton/input/input1 [ 7.624450] twl_rtc 48072000.i2c:twl@48:rtc: Power up reset detected. [ 7.631988] twl_rtc 48072000.i2c:twl@48:rtc: Enabling TWL-RTC [ 7.655456] twl_rtc 48072000.i2c:twl@48:rtc: rtc core: registered 48072000.i2c:twl@48 as rtc0 [ 7.923187] i2c /dev entries driver [ 8.246795] twl_rtc 48072000.i2c:twl@48:rtc: hctosys: unable to read the hardware clock [ 9.675994] omap_i2c 48072000.i2c: controller timed out [ 10.704010] omap_i2c 48072000.i2c: controller timed out [ 11.734069] omap_i2c 48072000.i2c: controller timed out root@omap2430sdp:/# [ 12.823638] omap_i2c 48072000.i2c: controller timed out [ 12.834747] twl4030: I2C error -110 reading PIH ISR -- 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
