| Message ID | 1455145370-20301-6-git-send-email-tony@atomide.com |
|---|---|
| State | Not Applicable |
| Headers | show |
On 11 February 2016 at 00:02, Tony Lindgren <tony@atomide.com> wrote: > Commit 5de85b9d57ab ("PM / runtime: Re-init runtime PM states at probe > error and driver unbind") introduced pm_runtime_reinit() that is used > to reinitialize PM runtime after -EPROBE_DEFER. This allows shutting > down the device after a failed probe. > > However, for drivers using pm_runtime_use_autosuspend() this can cause > a state where suspend callback is never called after -EPROBE_DEFER. > On the following device driver probe, hardware state is different from > the PM runtime state causing omap_device to produce the following > error: > > omap_device_enable() called from invalid state 1 > > And with omap_device and omap hardware being picky for PM, this will > block any deeper idle states in hardware. > > The solution is to fix the drivers to follow the PM runtime documentation: > > 1. For sections of code that needs the device disabled, use > pm_runtime_put_sync_suspend() if pm_runtime_set_autosuspend() has > been set. > > 2. For driver exit code, use pm_runtime_dont_use_autosuspend() before > pm_runtime_put_sync() if pm_runtime_use_autosuspend() has been > set. > > Fixes: 5de85b9d57ab ("PM / runtime: Re-init runtime PM states at probe > error and driver unbind") > Cc: linux-serial@vger.kernel.org > Cc: Alan Stern <stern@rowland.harvard.edu> > Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> > Cc: Kevin Hilman <khilman@baylibre.com> > Cc: Nishanth Menon <nm@ti.com> > Cc: Rafael J. Wysocki <rafael@kernel.org> > Cc: Ulf Hansson <ulf.hansson@linaro.org> > Cc: Tero Kristo <t-kristo@ti.com> > Signed-off-by: Tony Lindgren <tony@atomide.com> Acked-by: Ulf Hansson <ulf.hansson@linaro.org> Kind regards Uffe > --- > > Greg & Peter, I'd like to merge this along with other related fixes > via the ARM SoC tree if no objections, please review and ack if > this look OK to you. > > --- > drivers/tty/serial/omap-serial.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c > index b645f92..5c43f75 100644 > --- a/drivers/tty/serial/omap-serial.c > +++ b/drivers/tty/serial/omap-serial.c > @@ -1708,7 +1708,8 @@ static int serial_omap_probe(struct platform_device *pdev) > return 0; > > err_add_port: > - pm_runtime_put(&pdev->dev); > + pm_runtime_dont_use_autosuspend(&pdev->dev); > + pm_runtime_put_sync(&pdev->dev); > pm_runtime_disable(&pdev->dev); > pm_qos_remove_request(&up->pm_qos_request); > device_init_wakeup(up->dev, false); > @@ -1721,6 +1722,7 @@ static int serial_omap_remove(struct platform_device *dev) > { > struct uart_omap_port *up = platform_get_drvdata(dev); > > + pm_runtime_dont_use_autosuspend(up->dev); > pm_runtime_put_sync(up->dev); > pm_runtime_disable(up->dev); > uart_remove_one_port(&serial_omap_reg, &up->port); > -- > 2.7.0 > -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c index b645f92..5c43f75 100644 --- a/drivers/tty/serial/omap-serial.c +++ b/drivers/tty/serial/omap-serial.c @@ -1708,7 +1708,8 @@ static int serial_omap_probe(struct platform_device *pdev) return 0; err_add_port: - pm_runtime_put(&pdev->dev); + pm_runtime_dont_use_autosuspend(&pdev->dev); + pm_runtime_put_sync(&pdev->dev); pm_runtime_disable(&pdev->dev); pm_qos_remove_request(&up->pm_qos_request); device_init_wakeup(up->dev, false); @@ -1721,6 +1722,7 @@ static int serial_omap_remove(struct platform_device *dev) { struct uart_omap_port *up = platform_get_drvdata(dev); + pm_runtime_dont_use_autosuspend(up->dev); pm_runtime_put_sync(up->dev); pm_runtime_disable(up->dev); uart_remove_one_port(&serial_omap_reg, &up->port);
Commit 5de85b9d57ab ("PM / runtime: Re-init runtime PM states at probe error and driver unbind") introduced pm_runtime_reinit() that is used to reinitialize PM runtime after -EPROBE_DEFER. This allows shutting down the device after a failed probe. However, for drivers using pm_runtime_use_autosuspend() this can cause a state where suspend callback is never called after -EPROBE_DEFER. On the following device driver probe, hardware state is different from the PM runtime state causing omap_device to produce the following error: omap_device_enable() called from invalid state 1 And with omap_device and omap hardware being picky for PM, this will block any deeper idle states in hardware. The solution is to fix the drivers to follow the PM runtime documentation: 1. For sections of code that needs the device disabled, use pm_runtime_put_sync_suspend() if pm_runtime_set_autosuspend() has been set. 2. For driver exit code, use pm_runtime_dont_use_autosuspend() before pm_runtime_put_sync() if pm_runtime_use_autosuspend() has been set. Fixes: 5de85b9d57ab ("PM / runtime: Re-init runtime PM states at probe error and driver unbind") Cc: linux-serial@vger.kernel.org Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Kevin Hilman <khilman@baylibre.com> Cc: Nishanth Menon <nm@ti.com> Cc: Rafael J. Wysocki <rafael@kernel.org> Cc: Ulf Hansson <ulf.hansson@linaro.org> Cc: Tero Kristo <t-kristo@ti.com> Signed-off-by: Tony Lindgren <tony@atomide.com> --- Greg & Peter, I'd like to merge this along with other related fixes via the ARM SoC tree if no objections, please review and ack if this look OK to you. --- drivers/tty/serial/omap-serial.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)