Hi, On Thu, Nov 25, 2010 at 12:49 AM, Paul Walmsley <paul@xxxxxxxxx> wrote: > > The console semaphore must be held while the OMAP UART devices are > disabled, lest a console write cause an ARM abort (and a kernel crash) > when the underlying console device is inaccessible. These crashes > only occur when the console is on one of the OMAP internal serial > ports. This does not fix the issue for me on Beagle (console on ttyO2). Doing: / # echo 5 > /sys/devices/platform/omap/omap-hsuart.0/sleep_timeout / # echo 5 > /sys/devices/platform/omap/omap-hsuart.1/sleep_timeout / # echo 5 > /sys/devices/platform/omap/omap-hsuart.2/sleep_timeout and waiting 5 seconds hangs the console. However enabling sleep_while_idle before configuring the UART2 timeout makes it work ok: / # echo 5 > /sys/devices/platform/omap/omap-hsuart.0/sleep_timeout / # echo 5 > /sys/devices/platform/omap/omap-hsuart.1/sleep_timeout / # echo 1 > /debug/pm_debug/sleep_while_idle / # echo 5 > /sys/devices/platform/omap/omap-hsuart.2/sleep_timeout This result is similar to what I tested on a recent l-o master w/o the fix. Am I missing something? One more remark. With OFF mode enabled I noticed that PER can go OFF without CORE going OFF, which could trigger the errata i582. I think this is another latent problem. / # cat /debug/pm_debug/count usbhost_pwrdm (OFF),OFF:1,RET:1,INA:0,ON:1,RET-LOGIC-OFF:0,RET-MEMBANK1-OFF:0 sgx_pwrdm (OFF),OFF:1,RET:0,INA:0,ON:1,RET-LOGIC-OFF:0,RET-MEMBANK1-OFF:0 per_pwrdm (ON),OFF:3797,RET:2382,INA:0,ON:6180,RET-LOGIC-OFF:0,RET-MEMBANK1-OFF:0 dss_pwrdm (OFF),OFF:1,RET:1,INA:1,ON:1,RET-LOGIC-OFF:0,RET-MEMBANK1-OFF:0 cam_pwrdm (OFF),OFF:1,RET:1,INA:0,ON:1,RET-LOGIC-OFF:0,RET-MEMBANK1-OFF:0 core_pwrdm (ON),OFF:778,RET:3019,INA:0,ON:3798,RET-LOGIC-OFF:0,RET-MEMBANK1-OFF:0,RET-MEMBANK2-OFF:0 neon_pwrdm (ON),OFF:4367,RET:1806,INA:6,ON:6180,RET-LOGIC-OFF:0 mpu_pwrdm (ON),OFF:4367,RET:1806,INA:6,ON:6180,RET-LOGIC-OFF:0,RET-MEMBANK1-OFF:0 iva2_pwrdm (OFF),OFF:1,RET:1,INA:0,ON:1,RET-LOGIC-OFF:0,RET-MEMBANK1-OFF:0,RET-MEMBANK2-OFF:0,RET-MEMBANK3-OFF:0,RET-MEMBANK4-OFF:0 ... Any thoughts? Jean -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
