2014-08-06 16:21 GMT+02:00 Jean-Michel Hautbois <[email protected]>: > 2014-08-06 15:37 GMT+02:00 Fabio Estevam <[email protected]>: >> On Wed, Aug 6, 2014 at 10:27 AM, Jean-Michel Hautbois >> <[email protected]> wrote: >>> 2014-08-06 13:44 GMT+02:00 Jaehoon Chung <[email protected]>: >>>> Hi, >>> >>> Hi Jaehoon, >>> >>>> In my case, -84 error is related with timing. >>>> I recommend to check your clock source or pin strength.
I have dumped /sys/kernel/debug/mmc1/ios in both kernel releases. In the current kernel (3.16) : $> cat /sys/kernel/debug/mmc1/ios clock: 52000000 Hz actual clock: 49500000 Hz vdd: 21 (3.3 ~ 3.4 V) bus mode: 2 (push-pull) chip select: 0 (don't care) power mode: 2 (on) bus width: 3 (8 bits) timing spec: 8 (mmc DDR52) signal voltage: 0 (3.30 V) In the Freescale kernel (3.10.17) : $> cat /sys/kernel/debug/mmc1/ios clock: 52000000 Hz actual clock: 49500000 Hz vdd: 7 (1.65 - 1.95 V) bus mode: 2 (push-pull) chip select: 0 (don't care) power mode: 2 (on) bus width: 3 (8 bits) timing spec: 7 (sd uhs DDR50) signal voltage: 0 (3.30 V) As you can see, there is at least too differences : VDD is not the same I don't know why yet, and neither is timing spec. This seems to be the real cause... Investigating now, but any advice is interesting ! :) Thanks, JM -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
