diff options
| author |   Grygorii Strashko <grygorii.strashko@ti.com> | 2013-07-22 15:31:15 +0530 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-07-26 16:01:20 -0700 |
| commit | 3026d14a98d50c78e74d072cb05340a0f86b3938 (patch) | |
| tree | 041771561e628aa91a7366e4dbc19167151f9c95 /drivers/tty/serial/omap-serial.c | |
| parent | serial: fsl_lpuart: Return proper error on lpuart_serial_init error path (diff) | |
| download | linux-dev-3026d14a98d50c78e74d072cb05340a0f86b3938.tar.xz linux-dev-3026d14a98d50c78e74d072cb05340a0f86b3938.zip | |
serial: omap: enable PM runtime only when its fully configured
If earlyprintk is enabled and current UART is console port the platform
code can mark it as RPM_ACTIVE to sync real IP state with PM Runtime and
avoid resuming of already active device, but now, driver initialization
will be performed in the wrong way:
pm_runtime_enable(&pdev->dev);
<-- PM runtime alowed (device state RPM_ACTIVE)
if (omap_up_info->autosuspend_timeout == 0)
omap_up_info->autosuspend_timeout = -1;
device_init_wakeup(up->dev, true);
pm_runtime_use_autosuspend(&pdev->dev);
<-- update_autosuspend() will be called and it will disable device
(device state RPM_SUSPENDED)
pm_runtime_set_autosuspend_delay(&pdev->dev,
omap_up_info->autosuspend_timeout);
<-- update_autosuspend() will be called which will re-enable device
(device state RPM_ACTIVE), because autosuspend_timeout < 0
pm_runtime_irq_safe(&pdev->dev);
pm_runtime_get_sync(&pdev->dev);
<-- will do nothing
Such behavior isn't expected by OMAP serial drivers and causes
unpredictable calls of serial_omap_runtime_suspend() and
serial_omap_runtime_resume().
Hence, fix it by allowing PM runtime only after all its parameters are
configured.
CC: Tony Lindgren <tony@atomide.com>
CC: Rajendra Nayak <rnayak@ti.com>
CC: Felipe Balbi <balbi@ti.com>
CC: Kevin Hilman <khilman@linaro.org>
Tested-by: Mark Jackson <mpfj-list@newflow.co.uk>
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/omap-serial.c')
| -rw-r--r-- | drivers/tty/serial/omap-serial.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c index b0802149b3e7..c77bf0cf2684 100644 --- a/drivers/tty/serial/omap-serial.c +++ b/drivers/tty/serial/omap-serial.c @@ -1506,7 +1506,6 @@ static int serial_omap_probe(struct platform_device *pdev) INIT_WORK(&up->qos_work, serial_omap_uart_qos_work); platform_set_drvdata(pdev, up); - pm_runtime_enable(&pdev->dev); if (omap_up_info->autosuspend_timeout == 0) omap_up_info->autosuspend_timeout = -1; device_init_wakeup(up->dev, true); @@ -1515,6 +1514,8 @@ static int serial_omap_probe(struct platform_device *pdev) omap_up_info->autosuspend_timeout); pm_runtime_irq_safe(&pdev->dev); + pm_runtime_enable(&pdev->dev); + pm_runtime_get_sync(&pdev->dev); omap_serial_fill_features_erratas(up); |