On Wed, Nov 05, 2014 at 01:40:50PM -0500, Peter Hurley wrote: > Hi Greg, > > The kernel command line parameter, no_console_suspend, enables the serial > console to continue to output kernel message during system suspend/resume. > > However, the PNP bus will disable and power-down pnp devices on system > suspend, which defeats the purpose of no_console_suspend; namely to continue > to output messages in case those are the last messages before crashing. > > The first patch is a cleanup of the baroque logic of uart_suspend_port(). > The second patch overrides the PNP bus disabling the console device if > no_console_suspend is set. This patch uses existing PNP bus logic but > perhaps in a way not originally intended. > The third patch requires Rafael's ack, as it adds a capability to allow > the device to override the power-down function. > The fourth patch actually performs the power-down override enabled by > patch 3. > > With these patches, the PNP0501 device (16550A uart) will continue to > output messages while system suspend finishes, as intended by the > no_console_suspend parameter. [System resume is another problem, which > I'm working on]. > > Regards, > > Peter Hurley (4): > serial: core: Simplify console suspend logic in uart_suspend_port() > serial: 8250_pnp: Override pnp disable for no_console_suspend > PNP: Allow device to override ACPI device sleep > serial: 8250_pnp: Override pnp suspend for no_console_suspend > > drivers/pnp/driver.c | 2 +- > drivers/pnp/pnpacpi/core.c | 2 +- > drivers/tty/serial/8250/8250_pnp.c | 61 +++++++++++++++++++++++++++++++------- > drivers/tty/serial/serial_core.c | 35 +++++++++++----------- > include/linux/pnp.h | 3 ++ > 5 files changed, 72 insertions(+), 31 deletions(-) I'll drop these for now and wait for a second round of these patches. thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
