[PATCH 1/3] [media] v4l: rcar_fdp1: mark PM functions as __maybe_unused

[PATCH 1/3] [media] v4l: rcar_fdp1: mark PM functions as __maybe_unused

[Arnd Bergmann]

The new driver produces a warning when CONFIG_PM is disabled:

platform/rcar_fdp1.c:2408:12: error: 'fdp1_pm_runtime_resume' defined but not used [-Werror=unused-function]
platform/rcar_fdp1.c:2399:12: error: 'fdp1_pm_runtime_suspend' defined but not used [-Werror=unused-function]

This marks the two functions as __maybe_unused.

Fixes: 4710b752e029 ("[media] v4l: Add Renesas R-Car FDP1 Driver")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/media/platform/rcar_fdp1.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/rcar_fdp1.c b/drivers/media/platform/rcar_fdp1.c
index dd1a6ea17f22..674cc1309b43 100644
--- a/drivers/media/platform/rcar_fdp1.c
+++ b/drivers/media/platform/rcar_fdp1.c
@@ -2396,7 +2396,7 @@ static int fdp1_remove(struct platform_device *pdev)
 	return 0;
 }
 
-static int fdp1_pm_runtime_suspend(struct device *dev)
+static int __maybe_unused fdp1_pm_runtime_suspend(struct device *dev)
 {
 	struct fdp1_dev *fdp1 = dev_get_drvdata(dev);
 
@@ -2405,7 +2405,7 @@ static int fdp1_pm_runtime_suspend(struct device *dev)
 	return 0;
 }
 
-static int fdp1_pm_runtime_resume(struct device *dev)
+static int __maybe_unused fdp1_pm_runtime_resume(struct device *dev)
 {
 	struct fdp1_dev *fdp1 = dev_get_drvdata(dev);
 
-- 
2.9.0

[PATCH 2/3] [media] v4l: rcar_fdp1: add FCP dependency

[Arnd Bergmann]

drivers/media/platform/rcar_fdp1.o: In function `fdp1_pm_runtime_resume':
rcar_fdp1.c:(.text.fdp1_pm_runtime_resume+0x78): undefined reference to `rcar_fcp_enable'
drivers/media/platform/rcar_fdp1.o: In function `fdp1_pm_runtime_suspend':
rcar_fdp1.c:(.text.fdp1_pm_runtime_suspend+0x14): undefined reference to `rcar_fcp_disable'
drivers/media/platform/rcar_fdp1.o: In function `fdp1_probe':
rcar_fdp1.c:(.text.fdp1_probe+0x15c): undefined reference to `rcar_fcp_get'

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/media/platform/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
index 3c5a0b6b23a9..cd0cab6e0e31 100644
--- a/drivers/media/platform/Kconfig
+++ b/drivers/media/platform/Kconfig
@@ -311,6 +311,7 @@ config VIDEO_RENESAS_FDP1
 	tristate "Renesas Fine Display Processor"
 	depends on VIDEO_DEV && VIDEO_V4L2 && HAS_DMA
 	depends on ARCH_SHMOBILE || COMPILE_TEST
+	depends on (!ARCH_RENESAS && !VIDEO_RENESAS_FCP) || VIDEO_RENESAS_FCP
 	select VIDEOBUF2_DMA_CONTIG
 	select V4L2_MEM2MEM_DEV
 	---help---
-- 
2.9.0

Re: [PATCH 2/3] [media] v4l: rcar_fdp1: add FCP dependency

[Geert Uytterhoeven]

Hi Arnd,

On Fri, Nov 18, 2016 at 5:16 PM, Arnd Bergmann <arnd@arndb.de> wrote:
> drivers/media/platform/rcar_fdp1.o: In function `fdp1_pm_runtime_resume':
> rcar_fdp1.c:(.text.fdp1_pm_runtime_resume+0x78): undefined reference to `rcar_fcp_enable'
> drivers/media/platform/rcar_fdp1.o: In function `fdp1_pm_runtime_suspend':
> rcar_fdp1.c:(.text.fdp1_pm_runtime_suspend+0x14): undefined reference to `rcar_fcp_disable'
> drivers/media/platform/rcar_fdp1.o: In function `fdp1_probe':
> rcar_fdp1.c:(.text.fdp1_probe+0x15c): undefined reference to `rcar_fcp_get'
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>  drivers/media/platform/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
> index 3c5a0b6b23a9..cd0cab6e0e31 100644
> --- a/drivers/media/platform/Kconfig
> +++ b/drivers/media/platform/Kconfig
> @@ -311,6 +311,7 @@ config VIDEO_RENESAS_FDP1
>         tristate "Renesas Fine Display Processor"
>         depends on VIDEO_DEV && VIDEO_V4L2 && HAS_DMA
>         depends on ARCH_SHMOBILE || COMPILE_TEST
> +       depends on (!ARCH_RENESAS && !VIDEO_RENESAS_FCP) || VIDEO_RENESAS_FCP

Which tree and config is this? I don't have fdp1_pm_runtime_resume in my
renesas-drivers tree.

Why are the dummies for !CONFIG_VIDEO_RENESAS_FCP in include/media/rcar-fcp.h
not working?

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: [PATCH 2/3] [media] v4l: rcar_fdp1: add FCP dependency

[Arnd Bergmann]

On Friday, November 18, 2016 6:08:01 PM CET Geert Uytterhoeven wrote:
> > diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
> > index 3c5a0b6b23a9..cd0cab6e0e31 100644
> > --- a/drivers/media/platform/Kconfig
> > +++ b/drivers/media/platform/Kconfig
> > @@ -311,6 +311,7 @@ config VIDEO_RENESAS_FDP1
> >         tristate "Renesas Fine Display Processor"
> >         depends on VIDEO_DEV && VIDEO_V4L2 && HAS_DMA
> >         depends on ARCH_SHMOBILE || COMPILE_TEST
> > +       depends on (!ARCH_RENESAS && !VIDEO_RENESAS_FCP) || VIDEO_RENESAS_FCP
> 
> Which tree and config is this? I don't have fdp1_pm_runtime_resume in my
> renesas-drivers tree.
> 
> Why are the dummies for !CONFIG_VIDEO_RENESAS_FCP in include/media/rcar-fcp.h
> not working?

Oops, I forgot to write a proper changelog.

Commit 4710b752e029 ("[media] v4l: Add Renesas R-Car FDP1 Driver") in the
v4l-dvb tree adds CONFIG_VIDEO_RENESAS_FDP1.

It calls into the FCP driver, but when there is no dependency, FCP might
be a module while FDP1 is built-in.

We have the same logic in VIDEO_RENESAS_VSP1, which also depends on
FCP not being a module when it is built-in itself.

	Arnd

[PATCH 3/3] [media] mtk-mdp: mark PM functions as __maybe_unused

[Arnd Bergmann]

The driver still produces a warning when CONFIG_PM is disabled, an
earlier fix only partially solved this:

media/platform/mtk-mdp/mtk_mdp_core.c:72:13: error: 'mtk_mdp_clock_off' defined but not used [-Werror=unused-function]
media/platform/mtk-mdp/mtk_mdp_core.c:63:13: error: 'mtk_mdp_clock_on' defined but not used [-Werror=unused-function]

This removes the incorrect #ifdef again and instead marks the PM
functions as __maybe_unused, which reliably shuts up the warning.

Fixes: 1b06fcf56aa6 ("[media] media: mtk-mdp: fix build error")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/media/platform/mtk-mdp/mtk_mdp_core.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
index 51f2b50e406f..9e4eb7dcc424 100644
--- a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
+++ b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
@@ -234,8 +234,7 @@ static int mtk_mdp_remove(struct platform_device *pdev)
 	return 0;
 }
 
-#ifdef CONFIG_PM
-static int mtk_mdp_pm_suspend(struct device *dev)
+static int __maybe_unused mtk_mdp_pm_suspend(struct device *dev)
 {
 	struct mtk_mdp_dev *mdp = dev_get_drvdata(dev);
 
@@ -244,7 +243,7 @@ static int mtk_mdp_pm_suspend(struct device *dev)
 	return 0;
 }
 
-static int mtk_mdp_pm_resume(struct device *dev)
+static int __maybe_unused mtk_mdp_pm_resume(struct device *dev)
 {
 	struct mtk_mdp_dev *mdp = dev_get_drvdata(dev);
 
@@ -252,10 +251,8 @@ static int mtk_mdp_pm_resume(struct device *dev)
 
 	return 0;
 }
-#endif /* CONFIG_PM */
 
-#ifdef CONFIG_PM_SLEEP
-static int mtk_mdp_suspend(struct device *dev)
+static int __maybe_unused mtk_mdp_suspend(struct device *dev)
 {
 	if (pm_runtime_suspended(dev))
 		return 0;
@@ -263,14 +260,13 @@ static int mtk_mdp_suspend(struct device *dev)
 	return mtk_mdp_pm_suspend(dev);
 }
 
-static int mtk_mdp_resume(struct device *dev)
+static int __maybe_unused mtk_mdp_resume(struct device *dev)
 {
 	if (pm_runtime_suspended(dev))
 		return 0;
 
 	return mtk_mdp_pm_resume(dev);
 }
-#endif /* CONFIG_PM_SLEEP */
 
 static const struct dev_pm_ops mtk_mdp_pm_ops = {
 	SET_SYSTEM_SLEEP_PM_OPS(mtk_mdp_suspend, mtk_mdp_resume)
-- 
2.9.0