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* [PATCH 0/2] serial: qcom-geni: fix opp vote on shutdown
@ 2023-07-14 13:02 Johan Hovold
  2023-07-14 13:02 ` [PATCH 1/2] " Johan Hovold
  2023-07-14 13:02 ` [PATCH 2/2] serial: qcom-geni: clean up clock-rate debug printk Johan Hovold
  0 siblings, 2 replies; 7+ messages in thread
From: Johan Hovold @ 2023-07-14 13:02 UTC (permalink / raw)
  To: Greg Kroah-Hartman
  Cc: Andy Gross, Bjorn Andersson, Konrad Dybcio, Jiri Slaby,
	linux-arm-msm, linux-serial, linux-kernel, Johan Hovold

This series fixes the missing opp vote removal when closing a serial
port, which, for example, can lead to wasted power when a UART connected
Bluetooth controller is not in use.

Included is also a clean up of a related debug printk.

Johan


Johan Hovold (2):
  serial: qcom-geni: fix opp vote on shutdown
  serial: qcom-geni: clean up clock-rate debug printk

 drivers/tty/serial/qcom_geni_serial.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

-- 
2.41.0


^ permalink raw reply	[flat|nested] 7+ messages in thread

* [PATCH 1/2] serial: qcom-geni: fix opp vote on shutdown
  2023-07-14 13:02 [PATCH 0/2] serial: qcom-geni: fix opp vote on shutdown Johan Hovold
@ 2023-07-14 13:02 ` Johan Hovold
  2023-07-14 14:29   ` Konrad Dybcio
  2023-07-14 13:02 ` [PATCH 2/2] serial: qcom-geni: clean up clock-rate debug printk Johan Hovold
  1 sibling, 1 reply; 7+ messages in thread
From: Johan Hovold @ 2023-07-14 13:02 UTC (permalink / raw)
  To: Greg Kroah-Hartman
  Cc: Andy Gross, Bjorn Andersson, Konrad Dybcio, Jiri Slaby,
	linux-arm-msm, linux-serial, linux-kernel, Johan Hovold, stable,
	Rajendra Nayak, Matthias Kaehlcke

The operating-performance-point vote needs to be dropped when shutting
down the port to avoid wasting power by keeping resources like power
domains in an unnecessarily high performance state (e.g. when a UART
connected Bluetooth controller is not in use).

Fixes: a5819b548af0 ("tty: serial: qcom_geni_serial: Use OPP API to set clk/perf state")
Cc: stable@vger.kernel.org      # 5.9
Cc: Rajendra Nayak <quic_rjendra@quicinc.com>
Cc: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
---
 drivers/tty/serial/qcom_geni_serial.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
index b825b05e6137..8be896dbaa88 100644
--- a/drivers/tty/serial/qcom_geni_serial.c
+++ b/drivers/tty/serial/qcom_geni_serial.c
@@ -126,6 +126,7 @@ struct qcom_geni_serial_port {
 	dma_addr_t rx_dma_addr;
 	bool setup;
 	unsigned int baud;
+	unsigned long clk_rate;
 	void *rx_buf;
 	u32 loopback;
 	bool brk;
@@ -1249,6 +1250,7 @@ static void qcom_geni_serial_set_termios(struct uart_port *uport,
 			baud * sampling_rate, clk_rate, clk_div);
 
 	uport->uartclk = clk_rate;
+	port->clk_rate = clk_rate;
 	dev_pm_opp_set_rate(uport->dev, clk_rate);
 	ser_clk_cfg = SER_CLK_EN;
 	ser_clk_cfg |= clk_div << CLK_DIV_SHFT;
@@ -1513,10 +1515,13 @@ static void qcom_geni_serial_pm(struct uart_port *uport,
 
 	if (new_state == UART_PM_STATE_ON && old_state == UART_PM_STATE_OFF) {
 		geni_icc_enable(&port->se);
+		if (port->clk_rate)
+			dev_pm_opp_set_rate(uport->dev, port->clk_rate);
 		geni_se_resources_on(&port->se);
 	} else if (new_state == UART_PM_STATE_OFF &&
 			old_state == UART_PM_STATE_ON) {
 		geni_se_resources_off(&port->se);
+		dev_pm_opp_set_rate(uport->dev, 0);
 		geni_icc_disable(&port->se);
 	}
 }
-- 
2.41.0


^ permalink raw reply related	[flat|nested] 7+ messages in thread

* [PATCH 2/2] serial: qcom-geni: clean up clock-rate debug printk
  2023-07-14 13:02 [PATCH 0/2] serial: qcom-geni: fix opp vote on shutdown Johan Hovold
  2023-07-14 13:02 ` [PATCH 1/2] " Johan Hovold
@ 2023-07-14 13:02 ` Johan Hovold
  2023-07-14 14:26   ` Konrad Dybcio
  1 sibling, 1 reply; 7+ messages in thread
From: Johan Hovold @ 2023-07-14 13:02 UTC (permalink / raw)
  To: Greg Kroah-Hartman
  Cc: Andy Gross, Bjorn Andersson, Konrad Dybcio, Jiri Slaby,
	linux-arm-msm, linux-serial, linux-kernel, Johan Hovold

Make the clock-rate debug printk more readable by using an equal sign
instead of a dash as separator between names and values and adding some
spaces:

	qcom_geni_serial 988000.serial: desired_rate = 1843200, clk_rate = 7372800, clk_div = 4

Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
---
 drivers/tty/serial/qcom_geni_serial.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
index 8be896dbaa88..753ac68d03a6 100644
--- a/drivers/tty/serial/qcom_geni_serial.c
+++ b/drivers/tty/serial/qcom_geni_serial.c
@@ -1246,7 +1246,7 @@ static void qcom_geni_serial_set_termios(struct uart_port *uport,
 		goto out_restart_rx;
 	}
 
-	dev_dbg(port->se.dev, "desired_rate-%u, clk_rate-%lu, clk_div-%u\n",
+	dev_dbg(port->se.dev, "desired_rate = %u, clk_rate = %lu, clk_div = %u\n",
 			baud * sampling_rate, clk_rate, clk_div);
 
 	uport->uartclk = clk_rate;
-- 
2.41.0


^ permalink raw reply related	[flat|nested] 7+ messages in thread

* Re: [PATCH 2/2] serial: qcom-geni: clean up clock-rate debug printk
  2023-07-14 13:02 ` [PATCH 2/2] serial: qcom-geni: clean up clock-rate debug printk Johan Hovold
@ 2023-07-14 14:26   ` Konrad Dybcio
  0 siblings, 0 replies; 7+ messages in thread
From: Konrad Dybcio @ 2023-07-14 14:26 UTC (permalink / raw)
  To: Johan Hovold, Greg Kroah-Hartman
  Cc: Andy Gross, Bjorn Andersson, Jiri Slaby, linux-arm-msm,
	linux-serial, linux-kernel

On 14.07.2023 15:02, Johan Hovold wrote:
> Make the clock-rate debug printk more readable by using an equal sign
> instead of a dash as separator between names and values and adding some
> spaces:
> 
> 	qcom_geni_serial 988000.serial: desired_rate = 1843200, clk_rate = 7372800, clk_div = 4
> 
> Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
> ---
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>

Konrad
>  drivers/tty/serial/qcom_geni_serial.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
> index 8be896dbaa88..753ac68d03a6 100644
> --- a/drivers/tty/serial/qcom_geni_serial.c
> +++ b/drivers/tty/serial/qcom_geni_serial.c
> @@ -1246,7 +1246,7 @@ static void qcom_geni_serial_set_termios(struct uart_port *uport,
>  		goto out_restart_rx;
>  	}
>  
> -	dev_dbg(port->se.dev, "desired_rate-%u, clk_rate-%lu, clk_div-%u\n",
> +	dev_dbg(port->se.dev, "desired_rate = %u, clk_rate = %lu, clk_div = %u\n",
>  			baud * sampling_rate, clk_rate, clk_div);
>  
>  	uport->uartclk = clk_rate;

^ permalink raw reply	[flat|nested] 7+ messages in thread

* Re: [PATCH 1/2] serial: qcom-geni: fix opp vote on shutdown
  2023-07-14 13:02 ` [PATCH 1/2] " Johan Hovold
@ 2023-07-14 14:29   ` Konrad Dybcio
  2023-07-14 15:08     ` Johan Hovold
  0 siblings, 1 reply; 7+ messages in thread
From: Konrad Dybcio @ 2023-07-14 14:29 UTC (permalink / raw)
  To: Johan Hovold, Greg Kroah-Hartman
  Cc: Andy Gross, Bjorn Andersson, Jiri Slaby, linux-arm-msm,
	linux-serial, linux-kernel, stable, Rajendra Nayak,
	Matthias Kaehlcke

On 14.07.2023 15:02, Johan Hovold wrote:
> The operating-performance-point vote needs to be dropped when shutting
> down the port to avoid wasting power by keeping resources like power
> domains in an unnecessarily high performance state (e.g. when a UART
> connected Bluetooth controller is not in use).
> 
> Fixes: a5819b548af0 ("tty: serial: qcom_geni_serial: Use OPP API to set clk/perf state")
> Cc: stable@vger.kernel.org      # 5.9
> Cc: Rajendra Nayak <quic_rjendra@quicinc.com>
> Cc: Matthias Kaehlcke <mka@chromium.org>
> Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
> ---
I don't know a whole lot about this subsystem, but the PM call has
a pointer to uport which already contains this clock rate.. Is it
zeroed out by the core before we reach it, which would prevent us
from reusing it?

Konrad
>  drivers/tty/serial/qcom_geni_serial.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
> index b825b05e6137..8be896dbaa88 100644
> --- a/drivers/tty/serial/qcom_geni_serial.c
> +++ b/drivers/tty/serial/qcom_geni_serial.c
> @@ -126,6 +126,7 @@ struct qcom_geni_serial_port {
>  	dma_addr_t rx_dma_addr;
>  	bool setup;
>  	unsigned int baud;
> +	unsigned long clk_rate;
>  	void *rx_buf;
>  	u32 loopback;
>  	bool brk;
> @@ -1249,6 +1250,7 @@ static void qcom_geni_serial_set_termios(struct uart_port *uport,
>  			baud * sampling_rate, clk_rate, clk_div);
>  
>  	uport->uartclk = clk_rate;
> +	port->clk_rate = clk_rate;
>  	dev_pm_opp_set_rate(uport->dev, clk_rate);
>  	ser_clk_cfg = SER_CLK_EN;
>  	ser_clk_cfg |= clk_div << CLK_DIV_SHFT;
> @@ -1513,10 +1515,13 @@ static void qcom_geni_serial_pm(struct uart_port *uport,
>  
>  	if (new_state == UART_PM_STATE_ON && old_state == UART_PM_STATE_OFF) {
>  		geni_icc_enable(&port->se);
> +		if (port->clk_rate)
> +			dev_pm_opp_set_rate(uport->dev, port->clk_rate);
>  		geni_se_resources_on(&port->se);
>  	} else if (new_state == UART_PM_STATE_OFF &&
>  			old_state == UART_PM_STATE_ON) {
>  		geni_se_resources_off(&port->se);
> +		dev_pm_opp_set_rate(uport->dev, 0);
>  		geni_icc_disable(&port->se);
>  	}
>  }

^ permalink raw reply	[flat|nested] 7+ messages in thread

* Re: [PATCH 1/2] serial: qcom-geni: fix opp vote on shutdown
  2023-07-14 14:29   ` Konrad Dybcio
@ 2023-07-14 15:08     ` Johan Hovold
  2023-07-15  9:19       ` Konrad Dybcio
  0 siblings, 1 reply; 7+ messages in thread
From: Johan Hovold @ 2023-07-14 15:08 UTC (permalink / raw)
  To: Konrad Dybcio
  Cc: Johan Hovold, Greg Kroah-Hartman, Andy Gross, Bjorn Andersson,
	Jiri Slaby, linux-arm-msm, linux-serial, linux-kernel, stable,
	Rajendra Nayak, Matthias Kaehlcke

On Fri, Jul 14, 2023 at 04:29:08PM +0200, Konrad Dybcio wrote:
> On 14.07.2023 15:02, Johan Hovold wrote:
> > The operating-performance-point vote needs to be dropped when shutting
> > down the port to avoid wasting power by keeping resources like power
> > domains in an unnecessarily high performance state (e.g. when a UART
> > connected Bluetooth controller is not in use).
> > 
> > Fixes: a5819b548af0 ("tty: serial: qcom_geni_serial: Use OPP API to set clk/perf state")
> > Cc: stable@vger.kernel.org      # 5.9
> > Cc: Rajendra Nayak <quic_rjendra@quicinc.com>
> > Cc: Matthias Kaehlcke <mka@chromium.org>
> > Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
> > ---
> I don't know a whole lot about this subsystem, but the PM call has
> a pointer to uport which already contains this clock rate.. Is it
> zeroed out by the core before we reach it, which would prevent us
> from reusing it?

No, but this driver has other issues and I couldn't be arsed fixing them
before addressing this bug.

Specifically that uartclk variable can currently be set by userspace...

I'll fix that up next week.

Johan

^ permalink raw reply	[flat|nested] 7+ messages in thread

* Re: [PATCH 1/2] serial: qcom-geni: fix opp vote on shutdown
  2023-07-14 15:08     ` Johan Hovold
@ 2023-07-15  9:19       ` Konrad Dybcio
  0 siblings, 0 replies; 7+ messages in thread
From: Konrad Dybcio @ 2023-07-15  9:19 UTC (permalink / raw)
  To: Johan Hovold
  Cc: Johan Hovold, Greg Kroah-Hartman, Andy Gross, Bjorn Andersson,
	Jiri Slaby, linux-arm-msm, linux-serial, linux-kernel, stable,
	Rajendra Nayak, Matthias Kaehlcke

On 14.07.2023 17:08, Johan Hovold wrote:
> On Fri, Jul 14, 2023 at 04:29:08PM +0200, Konrad Dybcio wrote:
>> On 14.07.2023 15:02, Johan Hovold wrote:
>>> The operating-performance-point vote needs to be dropped when shutting
>>> down the port to avoid wasting power by keeping resources like power
>>> domains in an unnecessarily high performance state (e.g. when a UART
>>> connected Bluetooth controller is not in use).
>>>
>>> Fixes: a5819b548af0 ("tty: serial: qcom_geni_serial: Use OPP API to set clk/perf state")
>>> Cc: stable@vger.kernel.org      # 5.9
>>> Cc: Rajendra Nayak <quic_rjendra@quicinc.com>
>>> Cc: Matthias Kaehlcke <mka@chromium.org>
>>> Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
>>> ---
>> I don't know a whole lot about this subsystem, but the PM call has
>> a pointer to uport which already contains this clock rate.. Is it
>> zeroed out by the core before we reach it, which would prevent us
>> from reusing it?
> 
> No, but this driver has other issues and I couldn't be arsed fixing them
> before addressing this bug.
> 
> Specifically that uartclk variable can currently be set by userspace...
> 
> I'll fix that up next week.
OK sounds good

Acked-by: Konrad Dybcio <konrad.dybcio@linaro.org>

Konrad
> 
> Johan

^ permalink raw reply	[flat|nested] 7+ messages in thread

end of thread, other threads:[~2023-07-15  9:20 UTC | newest]

Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-07-14 13:02 [PATCH 0/2] serial: qcom-geni: fix opp vote on shutdown Johan Hovold
2023-07-14 13:02 ` [PATCH 1/2] " Johan Hovold
2023-07-14 14:29   ` Konrad Dybcio
2023-07-14 15:08     ` Johan Hovold
2023-07-15  9:19       ` Konrad Dybcio
2023-07-14 13:02 ` [PATCH 2/2] serial: qcom-geni: clean up clock-rate debug printk Johan Hovold
2023-07-14 14:26   ` Konrad Dybcio

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