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>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
Vignesh Raghavendra <vigneshr@ti.com>,
linux-serial@vger.kernel.org, linux-omap@vger.kernel.org,
linux-kernel@vger.kernel.org,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Subject: [PATCH 5/7] serial: 8250_omap: Require a valid wakeirq for deeper idle states
Date: Mon, 15 Nov 2021 10:42:01 +0200 [thread overview]
Message-ID: <20211115084203.56478-6-tony@atomide.com> (raw)
In-Reply-To: <20211115084203.56478-1-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_noresume(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_noidle(port->dev);
+
pm_runtime_mark_last_busy(port->dev);
pm_runtime_put_autosuspend(port->dev);
free_irq(port->irq, port);
--
2.33.1
next prev parent reply other threads:[~2021-11-15 8:44 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-15 8:41 [PATCHv4 0/7] Serial port generic PM to fix 8250 PM Tony Lindgren
2021-11-15 8:41 ` [PATCH 1/7] serial: core: Add support of runtime PM Tony Lindgren
2021-11-16 7:40 ` kernel test robot
2021-11-30 10:28 ` Johan Hovold
2021-12-09 7:29 ` Tony Lindgren
2021-12-09 10:35 ` Andy Shevchenko
2022-01-18 9:41 ` Tony Lindgren
2022-04-11 10:36 ` Andy Shevchenko
2022-04-11 10:55 ` Tony Lindgren
2021-11-15 8:41 ` [PATCH 2/7] serial: core: Add wakeup() and start_pending_tx() for asynchronous wake Tony Lindgren
2021-11-30 10:34 ` Johan Hovold
2021-11-15 8:41 ` [PATCH 3/7] serial: 8250_port: properly handle runtime PM in IRQ Tony Lindgren
2021-11-30 10:36 ` Johan Hovold
2021-11-15 8:42 ` [PATCH 4/7] serial: 8250: Implement wakeup for TX and use it for 8250_omap Tony Lindgren
2021-11-30 10:38 ` Johan Hovold
2021-11-15 8:42 ` Tony Lindgren [this message]
2021-11-30 10:40 ` [PATCH 5/7] serial: 8250_omap: Require a valid wakeirq for deeper idle states Johan Hovold
2021-11-15 8:42 ` [PATCH 6/7] serial: 8250_omap: Drop the use of pm_runtime_irq_safe() Tony Lindgren
2021-11-30 10:42 ` Johan Hovold
2021-11-15 8:42 ` [PATCH 7/7] serial: 8250_port: Remove calls to runtime PM Tony Lindgren
2021-11-30 10:47 ` Johan Hovold
2021-11-26 16:01 ` [PATCHv4 0/7] Serial port generic PM to fix 8250 PM Andy Shevchenko
2021-11-30 10:02 ` Johan Hovold
2021-12-09 7:37 ` Tony Lindgren
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20211115084203.56478-6-tony@atomide.com \
--to=tony@atomide.com \
--cc=andriy.shevchenko@intel.com \
--cc=andriy.shevchenko@linux.intel.com \
--cc=bigeasy@linutronix.de \
--cc=gregkh@linuxfoundation.org \
--cc=jirislaby@kernel.org \
--cc=johan@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-omap@vger.kernel.org \
--cc=linux-serial@vger.kernel.org \
--cc=vigneshr@ti.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).