From: Tony Lindgren <tony@atomide.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Andy Shevchenko <andriy.shevchenko@intel.com>,
Jiri Slaby <jirislaby@kernel.org>,
Johan Hovold <johan@kernel.org>,
Vignesh Raghavendra <vigneshr@ti.com>,
linux-serial@vger.kernel.org, linux-omap@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH 5/6] serial: 8250_omap: Require a valid wakeirq for deeper idle states
Date: Tue, 21 Sep 2021 13:33:45 +0300 [thread overview]
Message-ID: <20210921103346.64824-6-tony@atomide.com> (raw)
In-Reply-To: <20210921103346.64824-1-tony@atomide.com>
For deeper idle states the 8250 device gets powered off. The wakeup is
handled with a separate wakeirq controller monitoring the RX pin.
Let's check for a valid wakeirq before enabling deeper idle states.
Signed-off-by: Tony Lindgren <tony@atomide.com>
---
drivers/tty/serial/8250/8250_omap.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c
--- a/drivers/tty/serial/8250/8250_omap.c
+++ b/drivers/tty/serial/8250/8250_omap.c
@@ -133,6 +133,7 @@ struct omap8250_priv {
spinlock_t rx_dma_lock;
bool rx_dma_broken;
bool throttled;
+ unsigned int allow_rpm:1;
};
struct omap8250_dma_params {
@@ -676,6 +677,7 @@ static int omap_8250_startup(struct uart_port *port)
ret = dev_pm_set_dedicated_wake_irq(port->dev, priv->wakeirq);
if (ret)
return ret;
+ priv->allow_rpm = 1;
}
pm_runtime_get_sync(port->dev);
@@ -722,6 +724,10 @@ static int omap_8250_startup(struct uart_port *port)
if (up->dma && !(priv->habit & UART_HAS_EFR2))
up->dma->rx_dma(up);
+ /* Block runtime PM if no wakeirq, paired with shutdown */
+ if (!priv->allow_rpm)
+ pm_runtime_get(port->dev);
+
pm_runtime_mark_last_busy(port->dev);
pm_runtime_put_autosuspend(port->dev);
return 0;
@@ -760,6 +766,10 @@ static void omap_8250_shutdown(struct uart_port *port)
serial_out(up, UART_LCR, up->lcr & ~UART_LCR_SBC);
serial_out(up, UART_FCR, UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
+ /* Clear possible PM runtime block to pair with startup */
+ if (!priv->allow_rpm)
+ pm_runtime_put(port->dev);
+
pm_runtime_mark_last_busy(port->dev);
pm_runtime_put_autosuspend(port->dev);
free_irq(port->irq, port);
--
2.33.0
next prev parent reply other threads:[~2021-09-21 10:34 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-21 10:33 [PATCH 0/6] Get rid of pm_runtime_irq_safe() for 8250_omap Tony Lindgren
2021-09-21 10:33 ` [PATCH 1/6] n_tty: Start making use of -EAGAIN returned from process_output_block() Tony Lindgren
2021-09-21 11:58 ` Andy Shevchenko
2021-09-21 10:33 ` [PATCH 2/6] tty: n_gsm: Don't ignore write return value in gsmld_output() Tony Lindgren
2021-09-21 10:33 ` [PATCH 3/6] serial: core: Add new prep_tx for power management Tony Lindgren
2021-09-23 12:45 ` Johan Hovold
2021-09-23 15:02 ` Tony Lindgren
2021-09-24 14:37 ` Johan Hovold
2021-09-24 15:09 ` Tony Lindgren
2021-09-27 14:05 ` Johan Hovold
2021-09-21 10:33 ` [PATCH 4/6] serial: 8250: Implement " Tony Lindgren
2021-09-23 12:49 ` Johan Hovold
2021-09-23 15:05 ` Tony Lindgren
2021-09-24 14:44 ` Johan Hovold
2021-09-24 15:16 ` Tony Lindgren
2021-09-21 10:33 ` Tony Lindgren [this message]
2021-09-21 10:33 ` [PATCH 6/6] serial: 8250_omap: Drop the use of pm_runtime_irq_safe() Tony Lindgren
2021-09-21 12:03 ` [PATCH 0/6] Get rid of pm_runtime_irq_safe() for 8250_omap Andy Shevchenko
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