* [RESEND 2 PATCH] media: marvell-ccic: Add support for runtime PM
@ 2020-06-01 19:21 Lubomir Rintel
2020-06-04 20:26 ` Lubomir Rintel
2020-06-05 11:21 ` Sakari Ailus
0 siblings, 2 replies; 3+ messages in thread
From: Lubomir Rintel @ 2020-06-01 19:21 UTC (permalink / raw)
To: Mauro Carvalho Chehab
Cc: Jonathan Corbet, linux-media, linux-kernel, Lubomir Rintel
On MMP3, the camera block lives on na separate power island. We want to
turn it off if the CCIC is not in use to conserve power.
Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
---
drivers/media/platform/marvell-ccic/mcam-core.c | 3 +++
drivers/media/platform/marvell-ccic/mmp-driver.c | 12 ++++++++----
2 files changed, 11 insertions(+), 4 deletions(-)
diff --git a/drivers/media/platform/marvell-ccic/mcam-core.c b/drivers/media/platform/marvell-ccic/mcam-core.c
index 09775b6624c6b..c2cd1d461bd06 100644
--- a/drivers/media/platform/marvell-ccic/mcam-core.c
+++ b/drivers/media/platform/marvell-ccic/mcam-core.c
@@ -24,6 +24,7 @@
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/videodev2.h>
+#include <linux/pm_runtime.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-ctrls.h>
@@ -901,6 +902,7 @@ static void mcam_clk_enable(struct mcam_camera *mcam)
{
unsigned int i;
+ pm_runtime_get_sync(mcam->dev);
for (i = 0; i < NR_MCAM_CLK; i++) {
if (!IS_ERR(mcam->clk[i]))
clk_prepare_enable(mcam->clk[i]);
@@ -915,6 +917,7 @@ static void mcam_clk_disable(struct mcam_camera *mcam)
if (!IS_ERR(mcam->clk[i]))
clk_disable_unprepare(mcam->clk[i]);
}
+ pm_runtime_put(mcam->dev);
}
/* ---------------------------------------------------------------------- */
diff --git a/drivers/media/platform/marvell-ccic/mmp-driver.c b/drivers/media/platform/marvell-ccic/mmp-driver.c
index 92b92255dac66..eec482d16805b 100644
--- a/drivers/media/platform/marvell-ccic/mmp-driver.c
+++ b/drivers/media/platform/marvell-ccic/mmp-driver.c
@@ -24,6 +24,7 @@
#include <linux/list.h>
#include <linux/pm.h>
#include <linux/clk.h>
+#include <linux/pm_runtime.h>
#include "mcam-core.h"
@@ -313,10 +314,12 @@ static int mmpcam_probe(struct platform_device *pdev)
cam->irq = res->start;
ret = devm_request_irq(&pdev->dev, cam->irq, mmpcam_irq, IRQF_SHARED,
"mmp-camera", mcam);
- if (ret == 0) {
- mmpcam_add_device(cam);
- return 0;
- }
+ if (ret)
+ goto out;
+
+ mmpcam_add_device(cam);
+ pm_runtime_enable(&pdev->dev);
+ return 0;
out:
fwnode_handle_put(mcam->asd.match.fwnode);
@@ -332,6 +335,7 @@ static int mmpcam_remove(struct mmp_camera *cam)
mmpcam_remove_device(cam);
mccic_shutdown(mcam);
+ pm_runtime_force_suspend(mcam->dev);
return 0;
}
--
2.26.2
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [RESEND 2 PATCH] media: marvell-ccic: Add support for runtime PM
2020-06-01 19:21 [RESEND 2 PATCH] media: marvell-ccic: Add support for runtime PM Lubomir Rintel
@ 2020-06-04 20:26 ` Lubomir Rintel
2020-06-05 11:21 ` Sakari Ailus
1 sibling, 0 replies; 3+ messages in thread
From: Lubomir Rintel @ 2020-06-04 20:26 UTC (permalink / raw)
To: Mauro Carvalho Chehab
Cc: Jonathan Corbet, linux-media, linux-kernel, Sakari Ailus
Cc += Sakari. I'm wondering if you'd mind looking at this mmp ccic patch
too.
Thank you
Lubo
On Mon, Jun 01, 2020 at 09:21:24PM +0200, Lubomir Rintel wrote:
> On MMP3, the camera block lives on na separate power island. We want to
> turn it off if the CCIC is not in use to conserve power.
>
> Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
> ---
> drivers/media/platform/marvell-ccic/mcam-core.c | 3 +++
> drivers/media/platform/marvell-ccic/mmp-driver.c | 12 ++++++++----
> 2 files changed, 11 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/media/platform/marvell-ccic/mcam-core.c b/drivers/media/platform/marvell-ccic/mcam-core.c
> index 09775b6624c6b..c2cd1d461bd06 100644
> --- a/drivers/media/platform/marvell-ccic/mcam-core.c
> +++ b/drivers/media/platform/marvell-ccic/mcam-core.c
> @@ -24,6 +24,7 @@
> #include <linux/clk.h>
> #include <linux/clk-provider.h>
> #include <linux/videodev2.h>
> +#include <linux/pm_runtime.h>
> #include <media/v4l2-device.h>
> #include <media/v4l2-ioctl.h>
> #include <media/v4l2-ctrls.h>
> @@ -901,6 +902,7 @@ static void mcam_clk_enable(struct mcam_camera *mcam)
> {
> unsigned int i;
>
> + pm_runtime_get_sync(mcam->dev);
> for (i = 0; i < NR_MCAM_CLK; i++) {
> if (!IS_ERR(mcam->clk[i]))
> clk_prepare_enable(mcam->clk[i]);
> @@ -915,6 +917,7 @@ static void mcam_clk_disable(struct mcam_camera *mcam)
> if (!IS_ERR(mcam->clk[i]))
> clk_disable_unprepare(mcam->clk[i]);
> }
> + pm_runtime_put(mcam->dev);
> }
>
> /* ---------------------------------------------------------------------- */
> diff --git a/drivers/media/platform/marvell-ccic/mmp-driver.c b/drivers/media/platform/marvell-ccic/mmp-driver.c
> index 92b92255dac66..eec482d16805b 100644
> --- a/drivers/media/platform/marvell-ccic/mmp-driver.c
> +++ b/drivers/media/platform/marvell-ccic/mmp-driver.c
> @@ -24,6 +24,7 @@
> #include <linux/list.h>
> #include <linux/pm.h>
> #include <linux/clk.h>
> +#include <linux/pm_runtime.h>
>
> #include "mcam-core.h"
>
> @@ -313,10 +314,12 @@ static int mmpcam_probe(struct platform_device *pdev)
> cam->irq = res->start;
> ret = devm_request_irq(&pdev->dev, cam->irq, mmpcam_irq, IRQF_SHARED,
> "mmp-camera", mcam);
> - if (ret == 0) {
> - mmpcam_add_device(cam);
> - return 0;
> - }
> + if (ret)
> + goto out;
> +
> + mmpcam_add_device(cam);
> + pm_runtime_enable(&pdev->dev);
> + return 0;
>
> out:
> fwnode_handle_put(mcam->asd.match.fwnode);
> @@ -332,6 +335,7 @@ static int mmpcam_remove(struct mmp_camera *cam)
>
> mmpcam_remove_device(cam);
> mccic_shutdown(mcam);
> + pm_runtime_force_suspend(mcam->dev);
> return 0;
> }
>
> --
> 2.26.2
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [RESEND 2 PATCH] media: marvell-ccic: Add support for runtime PM
2020-06-01 19:21 [RESEND 2 PATCH] media: marvell-ccic: Add support for runtime PM Lubomir Rintel
2020-06-04 20:26 ` Lubomir Rintel
@ 2020-06-05 11:21 ` Sakari Ailus
1 sibling, 0 replies; 3+ messages in thread
From: Sakari Ailus @ 2020-06-05 11:21 UTC (permalink / raw)
To: Lubomir Rintel
Cc: Mauro Carvalho Chehab, Jonathan Corbet, linux-media, linux-kernel
Hi Lubomir,
Thanks for the patch.
On Mon, Jun 01, 2020 at 09:21:24PM +0200, Lubomir Rintel wrote:
> On MMP3, the camera block lives on na separate power island. We want to
s/on \Kn//
> turn it off if the CCIC is not in use to conserve power.
>
> Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
> ---
> drivers/media/platform/marvell-ccic/mcam-core.c | 3 +++
> drivers/media/platform/marvell-ccic/mmp-driver.c | 12 ++++++++----
> 2 files changed, 11 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/media/platform/marvell-ccic/mcam-core.c b/drivers/media/platform/marvell-ccic/mcam-core.c
> index 09775b6624c6b..c2cd1d461bd06 100644
> --- a/drivers/media/platform/marvell-ccic/mcam-core.c
> +++ b/drivers/media/platform/marvell-ccic/mcam-core.c
> @@ -24,6 +24,7 @@
> #include <linux/clk.h>
> #include <linux/clk-provider.h>
> #include <linux/videodev2.h>
> +#include <linux/pm_runtime.h>
> #include <media/v4l2-device.h>
> #include <media/v4l2-ioctl.h>
> #include <media/v4l2-ctrls.h>
> @@ -901,6 +902,7 @@ static void mcam_clk_enable(struct mcam_camera *mcam)
The clocks look like something that rather should be controlled by the
device's runtime PM state. Could it be put behind suspend/resume callbacks?
> {
> unsigned int i;
>
> + pm_runtime_get_sync(mcam->dev);
> for (i = 0; i < NR_MCAM_CLK; i++) {
> if (!IS_ERR(mcam->clk[i]))
> clk_prepare_enable(mcam->clk[i]);
> @@ -915,6 +917,7 @@ static void mcam_clk_disable(struct mcam_camera *mcam)
> if (!IS_ERR(mcam->clk[i]))
> clk_disable_unprepare(mcam->clk[i]);
> }
> + pm_runtime_put(mcam->dev);
> }
>
> /* ---------------------------------------------------------------------- */
> diff --git a/drivers/media/platform/marvell-ccic/mmp-driver.c b/drivers/media/platform/marvell-ccic/mmp-driver.c
> index 92b92255dac66..eec482d16805b 100644
> --- a/drivers/media/platform/marvell-ccic/mmp-driver.c
> +++ b/drivers/media/platform/marvell-ccic/mmp-driver.c
> @@ -24,6 +24,7 @@
> #include <linux/list.h>
> #include <linux/pm.h>
> #include <linux/clk.h>
> +#include <linux/pm_runtime.h>
>
> #include "mcam-core.h"
>
> @@ -313,10 +314,12 @@ static int mmpcam_probe(struct platform_device *pdev)
> cam->irq = res->start;
> ret = devm_request_irq(&pdev->dev, cam->irq, mmpcam_irq, IRQF_SHARED,
> "mmp-camera", mcam);
> - if (ret == 0) {
> - mmpcam_add_device(cam);
> - return 0;
> - }
> + if (ret)
> + goto out;
> +
> + mmpcam_add_device(cam);
> + pm_runtime_enable(&pdev->dev);
If you enable runtime PM here, there's a chance the clocks have been
prepared and enabled before this.
How about moving registerin clocks after this instead? Looking at the
current code, they are registered too early.
> + return 0;
>
> out:
> fwnode_handle_put(mcam->asd.match.fwnode);
> @@ -332,6 +335,7 @@ static int mmpcam_remove(struct mmp_camera *cam)
>
> mmpcam_remove_device(cam);
> mccic_shutdown(mcam);
> + pm_runtime_force_suspend(mcam->dev);
> return 0;
> }
>
--
Kind regards,
Sakari Ailus
^ permalink raw reply [flat|nested] 3+ messages in thread
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2020-06-04 20:26 ` Lubomir Rintel
2020-06-05 11:21 ` Sakari Ailus
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