2015-08-03 20:19:22

by Robert Jarzmik

[permalink] [raw]
Subject: [PATCH] video: fbdev: pxa3xx_gcu: prepare the clocks

The clocks need to be prepared before being enabled. Without it a
warning appears in the drivers probe path :

WARNING: CPU: 0 PID: 1 at drivers/clk/clk.c:707 clk_core_enable+0x84/0xa0()
Modules linked in:
CPU: 0 PID: 1 Comm: swapper Not tainted 4.2.0-rc3-cm-x300+ #804
Hardware name: CM-X300 module
[<c000ed50>] (unwind_backtrace) from [<c000ce08>] (show_stack+0x10/0x14)
[<c000ce08>] (show_stack) from [<c0017eb4>] (warn_slowpath_common+0x7c/0xb4)
[<c0017eb4>] (warn_slowpath_common) from [<c0017f88>] (warn_slowpath_null+0x1c/0x24)
[<c0017f88>] (warn_slowpath_null) from [<c02d30dc>] (clk_core_enable+0x84/0xa0)
[<c02d30dc>] (clk_core_enable) from [<c02d3118>] (clk_enable+0x20/0x34)
[<c02d3118>] (clk_enable) from [<c0200dfc>] (pxa3xx_gcu_probe+0x148/0x338)
[<c0200dfc>] (pxa3xx_gcu_probe) from
[<c022eccc>] (platform_drv_probe+0x30/0x94)

Signed-off-by: Robert Jarzmik <[email protected]>
---
drivers/video/fbdev/pxa3xx-gcu.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/video/fbdev/pxa3xx-gcu.c b/drivers/video/fbdev/pxa3xx-gcu.c
index 86bd457d039d..50bce45e7f3d 100644
--- a/drivers/video/fbdev/pxa3xx-gcu.c
+++ b/drivers/video/fbdev/pxa3xx-gcu.c
@@ -653,7 +653,7 @@ static int pxa3xx_gcu_probe(struct platform_device *pdev)
goto err_free_dma;
}

- ret = clk_enable(priv->clk);
+ ret = clk_prepare_enable(priv->clk);
if (ret < 0) {
dev_err(dev, "failed to enable clock\n");
goto err_misc_deregister;
@@ -685,7 +685,7 @@ err_misc_deregister:
misc_deregister(&priv->misc_dev);

err_disable_clk:
- clk_disable(priv->clk);
+ clk_disable_unprepare(priv->clk);

return ret;
}
--
2.1.4


2015-08-10 09:27:00

by Tomi Valkeinen

[permalink] [raw]
Subject: Re: [PATCH] video: fbdev: pxa3xx_gcu: prepare the clocks



On 03/08/15 23:15, Robert Jarzmik wrote:
> The clocks need to be prepared before being enabled. Without it a
> warning appears in the drivers probe path :
>
> WARNING: CPU: 0 PID: 1 at drivers/clk/clk.c:707 clk_core_enable+0x84/0xa0()
> Modules linked in:
> CPU: 0 PID: 1 Comm: swapper Not tainted 4.2.0-rc3-cm-x300+ #804
> Hardware name: CM-X300 module
> [<c000ed50>] (unwind_backtrace) from [<c000ce08>] (show_stack+0x10/0x14)
> [<c000ce08>] (show_stack) from [<c0017eb4>] (warn_slowpath_common+0x7c/0xb4)
> [<c0017eb4>] (warn_slowpath_common) from [<c0017f88>] (warn_slowpath_null+0x1c/0x24)
> [<c0017f88>] (warn_slowpath_null) from [<c02d30dc>] (clk_core_enable+0x84/0xa0)
> [<c02d30dc>] (clk_core_enable) from [<c02d3118>] (clk_enable+0x20/0x34)
> [<c02d3118>] (clk_enable) from [<c0200dfc>] (pxa3xx_gcu_probe+0x148/0x338)
> [<c0200dfc>] (pxa3xx_gcu_probe) from
> [<c022eccc>] (platform_drv_probe+0x30/0x94)
>
> Signed-off-by: Robert Jarzmik <[email protected]>
> ---
> drivers/video/fbdev/pxa3xx-gcu.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)

Thanks, I've queued this for 4.2 fixes.

Tomi

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2015-08-10 19:09:47

by Robert Jarzmik

[permalink] [raw]
Subject: Re: [PATCH] video: fbdev: pxa3xx_gcu: prepare the clocks

Tomi Valkeinen <[email protected]> writes:

> On 03/08/15 23:15, Robert Jarzmik wrote:
>
> Thanks, I've queued this for 4.2 fixes.
Thanks Tomi.

Cheers.

--
Robert