On 2017年02月20日 14:41, Christophe JAILLET wrote:
Le 20/02/2017 à 02:40, Mark yao a écrit :
On 2017年02月20日 00:59, Christophe JAILLET wrote:
It is likely that both 'clk_disable_unprepare()' should be called if
'pm_runtime_get_sync()' fails.
Add a new label for that, because 'err_set_rate' is not meaningful
in this
case.
Fixes: 1a0f7ed3abe2 ("drm/rockchip: cdn-dp: add cdn DP support for
rk3399")
Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
---
Not sure but a 'pm_runtime_get_sync()' is maybe also required in the
'err_set_rate' path.
---
drivers/gpu/drm/rockchip/cdn-dp-core.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/rockchip/cdn-dp-core.c
b/drivers/gpu/drm/rockchip/cdn-dp-core.c
index 9ab67a670885..0fe1ec8b8fb1 100644
--- a/drivers/gpu/drm/rockchip/cdn-dp-core.c
+++ b/drivers/gpu/drm/rockchip/cdn-dp-core.c
@@ -111,7 +111,7 @@ static int cdn_dp_clk_enable(struct
cdn_dp_device *dp)
ret = pm_runtime_get_sync(dp->dev);
if (ret < 0) {
DRM_DEV_ERROR(dp->dev, "cannot get pm runtime %d\n", ret);
- goto err_pclk;
+ goto err_sync;
I think the name err_pm_runtime_get is better.
err_sync is not a clear name for the pm_runtime_get_sync.
I will change it.
}
reset_control_assert(dp->core_rst);
@@ -133,6 +133,7 @@ static int cdn_dp_clk_enable(struct
cdn_dp_device *dp)
return 0;
err_set_rate:
+err_sync:
miss pm_runtime_put, it should be:
I am wondering if 'pm_runtime_put_sync' should be added, instead.
We want to revert the 'pm_runtime_get_sync' of line 111. According to
the naming of the function, the _sync version looks more logical to me.
Using ccoccinelle shows that 2/3 of functions calling both
'pm_runtime_get_sync' and 'pm_runtime_get[_sync]' and using the _sync
variant.
pm_runtime_get_sync will block until hardware actually done power configure,
we need make sure power is enable before use the hardware, So we should
use pm_runtime_get_sync at power on.
At power off time, use pm_runtime_put is enough, it can be async, no
need block.
Thanks.
Which semantic is the correct one?
err_set_rate:
pm_runtime_put(dp->dev);
err_pm_runtime_get:
clk_disable_unprepare(dp->core_clk);
err_core_clk:
clk_disable_unprepare(dp->core_clk);
err_core_clk:
clk_disable_unprepare(dp->pclk);
--
Ｍark Yao
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