i2c controller timed out

[Gina Glaser]

I am running the Ubuntu release on Pandaboard, and I am getting a
timeout when I try to scan for I2C devices. I am using the
"i2cdetect" tool from http://dl.lm-sensors.org/i2c-tools/releases/i2c-tools-3.0.3.tar.bz2
Below is the log. Does anyone have any ideas?

Thanks,
Gina


gina@gina-desktop:/i2c-tools-3.0.3/tools$ sudo ./i2cdetect -y -r 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- [ 490.492431] i2c_omap i2c_omap.1: controller timed
out
-- -- [ 491.515838] i2c_omap i2c_omap.1: controller timed out
-- -- [ 492.539123] i2c_omap i2c_omap.1: controller timed out
-- -- [ 493.570709] i2c_omap i2c_omap.1: controller timed out
-- -- [ 494.678619] i2c_omap i2c_omap.1: controller timed out
-- -- [ 495.749389] i2c_omap i2c_omap.1: controller timed out
-- --

[modyrater]

Gina-desktop is on the Panda I am guessing?

Sent via Droid on Verizon Wireless

[mike digioia]

I am having some trouble with using i2cdetect on a different platform with ARM. Then I created my own src similar to the one I have on ubuntu, but does not take command line params. Since this code is an application, should one expect platform porting issues with linux 2.6.30UP kernls? 

[prpplague]

for recent kernels there is the need to apply the following patch:

diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-
omap.c
index 58a58c7..bba0441 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -276,7 +276,7 @@ static void omap_i2c_unidle(struct omap_i2c_dev
*dev)

pm_runtime_get_sync(&pdev->dev);

- if (cpu_is_omap34xx()) {
+ if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0);
omap_i2c_write_reg(dev, OMAP_I2C_PSC_REG, dev->pscstate);
omap_i2c_write_reg(dev, OMAP_I2C_SCLL_REG, dev->scllstate);
@@ -493,7 +493,7 @@ static int omap_i2c_init(struct omap_i2c_dev *dev)
OMAP_I2C_IE_AL) | ((dev->fifo_size) ?
(OMAP_I2C_IE_RDR | OMAP_I2C_IE_XDR) : 0);
omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, dev->iestate);
- if (cpu_is_omap34xx()) {
+ if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
dev->pscstate = psc;
dev->scllstate = scll;
dev->sclhstate = sclh;



a long term fix is already making it's way through the mainline kernel
submission process:


http://git.kernel.org/?p=linux/kernel/git/tmlind/linux-omap-2.6.git;a=commit;h=d98c94c1a6bef77554f893025a6d1c7869ac4736



thanks
Dave

On Apr 20, 1:25 pm, mike digioia <mpd...@gmail.com> wrote:
> I am having some trouble with using i2cdetect on a different platform with
> ARM. Then I created my own src similar to the one I have on ubuntu, but does
> not take command line params. Since this code is an application, should one
> expect platform porting issues with linux 2.6.30UP kernls?
>

[Ricardo Salveti]

On Thu, Apr 14, 2011 at 10:35 AM, Gina Glaser <g-gl...@ti.com> wrote:
> I am running the Ubuntu release on Pandaboard, and I am getting a
> timeout when I try to scan for I2C devices.  I am using the
> "i2cdetect" tool from  http://dl.lm-sensors.org/i2c-tools/releases/i2c-tools-3.0.3.tar.bz2
> Below is the log.  Does anyone have any ideas?

The timeout is fine because not every address have a device. Even with
the timeouts you still should get the following result:
http://paste.ubuntu.com/596705/

Cheers,
--
Ricardo Salveti de Araujo

[Ricardo Salveti]

Just to say that this patch is already included at the latest Ubuntu kernel.

[prpplague]

Ricardo,

actually without the patch, all applications using the i2cdev
character device will fail. the i2cdetect is just an easy case to
replicate the problem.

Dave

On Apr 22, 3:01 am, Ricardo Salveti <rsalv...@rsalveti.net> wrote: