On Wed, Nov 2, 2016 at 11:23 AM, Robert Nelson <[email protected]> wrote: > I've just added a forward port of the eqep driver.. One of the big > changes, the eqep clock should be enabled/setup via the device-tree, > instead of the driver.. > > [ 36.292972] eqep 48300180.eqep: ver. 1.0 > [ 36.293178] eqep 48300180.eqep: count_mode:0 > [ 36.293187] eqep 48300180.eqep: invert_qa:1 > [ 36.293195] eqep 48300180.eqep: invert_qb:1 > [ 36.293201] eqep 48300180.eqep: invert_qi:0 > [ 36.293208] eqep 48300180.eqep: invert_qs:0 > [ 36.293215] eqep 48300180.eqep: swap_inputs:0 > [ 36.293222] eqep 48300180.eqep: QDECCTL:0x0180 > [ 36.293230] eqep 48300180.eqep: QPOSINIT:0x00000000 > [ 36.293236] eqep 48300180.eqep: QPOSMAX:0xffffffff > [ 36.293241] eqep 48300180.eqep: QPOSCNT:0x00000000 > [ 36.293249] eqep 48300180.eqep: omit_interrupt:0 > [ 36.293254] eqep 48300180.eqep: QEINT:0x0800 > [ 36.293261] eqep 48300180.eqep: QUPRD:0x05f5e100 > [ 36.293267] eqep 48300180.eqep: QEPCTL:0x009e write > [ 36.293273] eqep 48300180.eqep: QEPCTL:0x009e read > [ 36.293296] eqep 48300180.eqep: irq:193, clk_rate:100000000 > > It would be awesome if someone who had it working in v4.4.x-bone/etc.. > Could verify. ;)
eqep was working for me in 4.4.x but I get a segmentation fault when I read the sysfs position file: # cat /sys/devices/platform/ocp/48304000.epwmss/48304180.eqep/position It seems to happen at this call to readl() in eqep_get_position(): Line 401: position = readl(eqep->mmio_base + QPOSCNT); from dmesg: [ 1858.085381] DEBUG: tieqep.c: eqep_get_position: QPOSCNT=0 [ 1858.102133] DEBUG: tieqep.c: eqep_get_position: eqep->mmio_base=fa304180 [ 1858.108446] Unhandled fault: external abort on non-linefetch (0x1028) at 0xfa304184 I got some good hints from Google+: https://plus.google.com/u/0/+DrewFustini/posts/MYfYUyQvv7W Michael Welling wrote: > This external abort fault is probably caused by the clock being dynamically > disabled by runtime suspend. pm_runtime_get_sync is missing somewhere. Felipe Balbi wrote: > Looking at the diff, it works on 4.4 out of sheer luck. There's nothing > guaranteeing > clock won't be gated. Enable pm runtime and call pm runtime get sync I'm now reading about pm_runtime_get_sync() in Documentation/power/runtime_pm.txt. I'll update if I make any progress. Thanks, Drew -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CAEf4M_DUkK125T93P92-DEB8dtMP62YSunK5yxVMqfy%3DR%2Bh08A%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
