diff options
| author | Thomas Richard <thomas.richard@bootlin.com> | 2023-10-17 15:05:40 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-10-21 18:34:34 +0200 |
| commit | 68e6939ea9ec3d6579eadeab16060339cdeaf940 (patch) | |
| tree | 65f1a0d194f28d98b78d473a1377203265713672 | |
| parent | a30badfd7c13fc8763a9e10c5a12ba7f81515a55 (diff) | |
serial: 8250_omap: Set the console genpd always on if no console suspend
If the console suspend is disabled, the genpd of the console shall not
be powered-off during suspend.
Set the flag GENPD_FLAG_ALWAYS_ON to the corresponding genpd during
suspend, and restore the original value during the resume.
Signed-off-by: Thomas Richard <thomas.richard@bootlin.com>
Link: https://lore.kernel.org/r/20231017130540.1149721-1-thomas.richard@bootlin.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/tty/serial/8250/8250_omap.c | 33 |
1 files changed, 28 insertions, 5 deletions
diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c index 4b33f4529aed..2d42f485c987 100644 --- a/drivers/tty/serial/8250/8250_omap.c +++ b/drivers/tty/serial/8250/8250_omap.c @@ -28,6 +28,7 @@ #include <linux/pm_wakeirq.h> #include <linux/dma-mapping.h> #include <linux/sys_soc.h> +#include <linux/pm_domain.h> #include "8250.h" @@ -115,6 +116,12 @@ /* RX FIFO occupancy indicator */ #define UART_OMAP_RX_LVL 0x19 +/* + * Copy of the genpd flags for the console. + * Only used if console suspend is disabled + */ +static unsigned int genpd_flags_console; + struct omap8250_priv { void __iomem *membase; int line; @@ -1623,6 +1630,7 @@ static int omap8250_suspend(struct device *dev) { struct omap8250_priv *priv = dev_get_drvdata(dev); struct uart_8250_port *up = serial8250_get_port(priv->line); + struct generic_pm_domain *genpd = pd_to_genpd(dev->pm_domain); int err = 0; serial8250_suspend_port(priv->line); @@ -1633,8 +1641,19 @@ static int omap8250_suspend(struct device *dev) if (!device_may_wakeup(dev)) priv->wer = 0; serial_out(up, UART_OMAP_WER, priv->wer); - if (uart_console(&up->port) && console_suspend_enabled) - err = pm_runtime_force_suspend(dev); + if (uart_console(&up->port)) { + if (console_suspend_enabled) + err = pm_runtime_force_suspend(dev); + else { + /* + * The pd shall not be powered-off (no console suspend). + * Make copy of genpd flags before to set it always on. + * The original value is restored during the resume. + */ + genpd_flags_console = genpd->flags; + genpd->flags |= GENPD_FLAG_ALWAYS_ON; + } + } flush_work(&priv->qos_work); return err; @@ -1644,12 +1663,16 @@ static int omap8250_resume(struct device *dev) { struct omap8250_priv *priv = dev_get_drvdata(dev); struct uart_8250_port *up = serial8250_get_port(priv->line); + struct generic_pm_domain *genpd = pd_to_genpd(dev->pm_domain); int err; if (uart_console(&up->port) && console_suspend_enabled) { - err = pm_runtime_force_resume(dev); - if (err) - return err; + if (console_suspend_enabled) { + err = pm_runtime_force_resume(dev); + if (err) + return err; + } else + genpd->flags = genpd_flags_console; } serial8250_resume_port(priv->line); |