"Govindraj.R" <[email protected]> writes: > From: "Govindraj.R" <[email protected]> > > With set_wakeup port ops availability from serial_core layer > which will be called when port is opened with state as true > indicating the wakeups can be enabled for this port and state > as false while port shutdown where we can disable the wakeups. > > But wakeup can be also enabled/disabled when requested from sysfs. > If disabled wakeup will be disabled while entering suspend and be > enabled back based on pm state while resuming.
Nice, this is definitely the right direction. Thanks. > Thanks to Kevin Hilman <[email protected]> for suggesting this. > Discussion References: > http://www.spinics.net/lists/linux-omap/msg67764.html > http://www.spinics.net/lists/linux-omap/msg67838.html > > Cc: Paul Walmsley <[email protected]> > Signed-off-by: Kevin Hilman <[email protected]> > [suggestion and modification to enable and disable wakeup > capability based on port usage] I haven't signed-off on this, and technically since I'm not on the delivery path, I shouldn't have a sign-off either. See Documenation/SubmittingPatches for all the details on s-o-b tags. I will give it an ack or tested-by after I've gone through it, but for now I have a few minor comments below. Also just reported that l-o master has broken UART wakeups due to the default mux settings change earlier, so that has to be sorted out in order to properly test this. > Signed-off-by: Govindraj.R <[email protected]> > --- > > Patch is tested using the patch as in here[1] > Tested on beagle-XM by enabling and disabling wakeups > from sysfs and opening and closing a uart port. > > [1]: http://marc.info/?l=linux-omap&m=133518614022144&w=2 > > > arch/arm/plat-omap/include/plat/omap-serial.h | 1 - > drivers/tty/serial/omap-serial.c | 45 > +++++++++++++++---------- > 2 files changed, 27 insertions(+), 19 deletions(-) > > diff --git a/arch/arm/plat-omap/include/plat/omap-serial.h > b/arch/arm/plat-omap/include/plat/omap-serial.h > index 9ff4444..8e6d734 100644 > --- a/arch/arm/plat-omap/include/plat/omap-serial.h > +++ b/arch/arm/plat-omap/include/plat/omap-serial.h > @@ -130,7 +130,6 @@ struct uart_omap_port { > unsigned long port_activity; > u32 context_loss_cnt; > u32 errata; > - u8 wakeups_enabled; > > struct pm_qos_request pm_qos_request; > u32 latency; > diff --git a/drivers/tty/serial/omap-serial.c > b/drivers/tty/serial/omap-serial.c > index d00b38e..b8f328e 100644 > --- a/drivers/tty/serial/omap-serial.c > +++ b/drivers/tty/serial/omap-serial.c > @@ -525,6 +525,7 @@ static int serial_omap_startup(struct uart_port *port) > dev_dbg(up->port.dev, "serial_omap_startup+%d\n", up->port.line); > > pm_runtime_get_sync(&up->pdev->dev); > + stray whitespace change? > /* > * Clear the FIFO buffers and disable them. > * (they will be reenabled in set_termios()) > @@ -910,11 +911,27 @@ serial_omap_set_termios(struct uart_port *port, struct > ktermios *termios, > dev_dbg(up->port.dev, "serial_omap_set_termios+%d\n", up->port.line); > } > > +static int serial_omap_set_wake(struct uart_port *port, unsigned int state) > +{ > + struct uart_omap_port *up = (struct uart_omap_port *)port; > + struct omap_uart_port_info *pdata = up->pdev->dev.platform_data; > + u8 enable_wakeup = false; s/u8/bool/ > + > + if (state) > + enable_wakeup = true; > + > + if (pdata->enable_wakeup) > + pdata->enable_wakeup(up->pdev, enable_wakeup); but actually, the above 7 lines could be more concisely written: if (pdata->enable_wakeup) pdata->enable_wakeup(up->pdev, state ? true : false); > + > + return 0; > +} > + > static void > serial_omap_pm(struct uart_port *port, unsigned int state, > unsigned int oldstate) > { > struct uart_omap_port *up = (struct uart_omap_port *)port; > + struct omap_uart_port_info *pdata = up->pdev->dev.platform_data; > unsigned char efr; > > dev_dbg(up->port.dev, "serial_omap_pm+%d\n", up->port.line); > @@ -930,12 +947,8 @@ serial_omap_pm(struct uart_port *port, unsigned int > state, > serial_out(up, UART_EFR, efr); > serial_out(up, UART_LCR, 0); > > - if (!device_may_wakeup(&up->pdev->dev)) { > - if (!state) > - pm_runtime_forbid(&up->pdev->dev); > - else > - pm_runtime_allow(&up->pdev->dev); > - } > + if (!state && pdata->enable_wakeup) > + pdata->enable_wakeup(up->pdev, true); > > pm_runtime_put(&up->pdev->dev); > } > @@ -1161,6 +1174,7 @@ static struct uart_ops serial_omap_pops = { > .shutdown = serial_omap_shutdown, > .set_termios = serial_omap_set_termios, > .pm = serial_omap_pm, > + .set_wake = serial_omap_set_wake, > .type = serial_omap_type, > .release_port = serial_omap_release_port, > .request_port = serial_omap_request_port, > @@ -1184,10 +1198,14 @@ static struct uart_driver serial_omap_reg = { > static int serial_omap_suspend(struct device *dev) > { > struct uart_omap_port *up = dev_get_drvdata(dev); > + struct omap_uart_port_info *pdata = dev->platform_data; > > if (up) { > uart_suspend_port(&serial_omap_reg, &up->port); > flush_work_sync(&up->qos_work); > + > + if (!device_may_wakeup(dev)) > + pdata->enable_wakeup(up->pdev, false); If wakeups are disabled in suspend, where are they re-enabled? I don't see anything added to the ->resume() method. Is serial_omap_pm() called during resume to ensure wakeups are (re)enabled? If so this should be well described in the changelog. Kevin > } > > return 0; > @@ -1476,6 +1494,9 @@ static int serial_omap_probe(struct platform_device > *pdev) > if (ret != 0) > goto err_add_port; > > + if (omap_up_info->enable_wakeup) > + omap_up_info->enable_wakeup(pdev, false); > + > pm_runtime_put(&pdev->dev); > platform_set_drvdata(pdev, up); > return 0; > @@ -1582,18 +1603,6 @@ static int serial_omap_runtime_suspend(struct device > *dev) > if (pdata->get_context_loss_count) > up->context_loss_cnt = pdata->get_context_loss_count(dev); > > - if (device_may_wakeup(dev)) { > - if (!up->wakeups_enabled) { > - pdata->enable_wakeup(up->pdev, true); > - up->wakeups_enabled = true; > - } > - } else { > - if (up->wakeups_enabled) { > - pdata->enable_wakeup(up->pdev, false); > - up->wakeups_enabled = false; > - } > - } > - > /* Errata i291 */ > if (up->use_dma && pdata->set_forceidle && > (up->errata & UART_ERRATA_i291_DMA_FORCEIDLE)) -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
