Russell King - ARM Linux <linux@xxxxxxxxxxxxxxxx> writes: > On Fri, Oct 12, 2012 at 09:35:54AM -0700, Kevin Hilman wrote: >> Sourav <sourav.poddar@xxxxxx> writes: >> > diff --git a/drivers/tty/serial/omap-serial.c >> > b/drivers/tty/serial/omap-serial.c >> > index 6ede6fd..3fbc7f7 100644 >> > --- a/drivers/tty/serial/omap-serial.c >> > +++ b/drivers/tty/serial/omap-serial.c >> > @@ -1414,6 +1414,7 @@ static int __devinit serial_omap_probe(struct >> > platform_device *pdev) >> > INIT_WORK(&up->qos_work, serial_omap_uart_qos_work); >> > >> > platform_set_drvdata(pdev, up); >> > + pm_runtime_set_active(&pdev->dev); >> >> NAK. >> >> This will obviously break platforms where the UARTs are not active >> before driver loads. > > I thought I had proposed a solution for this issue, which was this > sequence: > > omap_device_enable(dev); > pm_runtime_set_active(dev); > pm_runtime_enable(dev); > > Yes, I can understand people not liking the omap_device_enable() > there, but I also notice that the email suggesting that never got a > reply either - not even a "I tried this and it doesn't work" or "it > does work". Yes, that solution would work (though I didn't actually try it.) However, we can't use omap_device_enable() in the driver. We're trying to clean all the drivers of OMAP-specific APIs. That being said, something similar could be done in the device/board init code to ensure the UART HW is in the state that the driver is expecting it, but again, that would just mask the real problem which is that a (re)init of the console UART on 2420/n800 is causing output to disappear. As I detailed in an earlier response, I still think it's the fact that the pinmux is not setup correctly for the console UART pins in the board file, so when the UART is initialized, its mux settings are changed from the bootloader defaults, causing output to disappear. > As such, it seems this issue isn't making any progress as we had > already established that merely doing a "pm_runtime_set_active()" > before "pm_runtime_enable()" was going to break other platforms. Agreed. Kevin -- 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
