| Message ID | 85d92ba9e709ef00673a3e0e11769b121745e9cb.1619519080.git.mchehab+huawei@kernel.org (mailing list archive) |
|---|---|
| State | New |
| Delegated to: | Kieran Bingham |
| Headers | show |
| Series | Address some issues with PM runtime at media subsystem | expand |
On Tue, Apr 27, 2021 at 12:28 PM Mauro Carvalho Chehab <mchehab+huawei@kernel.org> wrote: > Commit dd8088d5a896 ("PM: runtime: Add pm_runtime_resume_and_get to deal with usage counter") > added pm_runtime_resume_and_get() in order to automatically handle > dev->power.usage_count decrement on errors. > > Use the new API, in order to cleanup the error check logic. > > Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> > Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> > --- a/drivers/media/platform/rcar-vin/rcar-csi2.c > +++ b/drivers/media/platform/rcar-vin/rcar-csi2.c > @@ -408,6 +408,12 @@ static void rcsi2_enter_standby(struct rcar_csi2 *priv) > > static void rcsi2_exit_standby(struct rcar_csi2 *priv) > { > + /* > + * The code at rcsi2_enter_standby() assumes > + * inconditionally that PM runtime usage count was unconditionally > + * incremented. So, it shouldn't use pm_runtime_resume_and_get() > + * here. > + */ > pm_runtime_get_sync(priv->dev); > reset_control_deassert(priv->rstc); > } Gr{oetje,eeting}s, Geert
Hi Mauro, On 2021-04-27 12:27:08 +0200, Mauro Carvalho Chehab wrote: > Commit dd8088d5a896 ("PM: runtime: Add pm_runtime_resume_and_get to deal with usage counter") > added pm_runtime_resume_and_get() in order to automatically handle > dev->power.usage_count decrement on errors. > > Use the new API, in order to cleanup the error check logic. > > Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> > Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> > --- > drivers/media/platform/rcar-vin/rcar-csi2.c | 6 ++++++ > drivers/media/platform/rcar-vin/rcar-dma.c | 6 ++---- > drivers/media/platform/rcar-vin/rcar-v4l2.c | 6 ++---- > 3 files changed, 10 insertions(+), 8 deletions(-) > > diff --git a/drivers/media/platform/rcar-vin/rcar-csi2.c b/drivers/media/platform/rcar-vin/rcar-csi2.c > index e06cd512aba2..ce8e84f9e3d9 100644 > --- a/drivers/media/platform/rcar-vin/rcar-csi2.c > +++ b/drivers/media/platform/rcar-vin/rcar-csi2.c > @@ -408,6 +408,12 @@ static void rcsi2_enter_standby(struct rcar_csi2 *priv) > > static void rcsi2_exit_standby(struct rcar_csi2 *priv) > { > + /* > + * The code at rcsi2_enter_standby() assumes > + * inconditionally that PM runtime usage count was > + * incremented. So, it shouldn't use pm_runtime_resume_and_get() > + * here. > + */ I think this comment is a bit much. I won't object if you really want to keep it but my preference would be to drop it. > pm_runtime_get_sync(priv->dev); > reset_control_deassert(priv->rstc); > } > diff --git a/drivers/media/platform/rcar-vin/rcar-dma.c b/drivers/media/platform/rcar-vin/rcar-dma.c > index f30dafbdf61c..f5f722ab1d4e 100644 > --- a/drivers/media/platform/rcar-vin/rcar-dma.c > +++ b/drivers/media/platform/rcar-vin/rcar-dma.c > @@ -1458,11 +1458,9 @@ int rvin_set_channel_routing(struct rvin_dev *vin, u8 chsel) > u32 vnmc; > int ret; > > - ret = pm_runtime_get_sync(vin->dev); > - if (ret < 0) { > - pm_runtime_put_noidle(vin->dev); > + ret = pm_runtime_resume_and_get(vin->dev); > + if (ret < 0) > return ret; > - } > > /* Make register writes take effect immediately. */ > vnmc = rvin_read(vin, VNMC_REG); > diff --git a/drivers/media/platform/rcar-vin/rcar-v4l2.c b/drivers/media/platform/rcar-vin/rcar-v4l2.c > index 457a65bf6b66..b1e9f86caa5c 100644 > --- a/drivers/media/platform/rcar-vin/rcar-v4l2.c > +++ b/drivers/media/platform/rcar-vin/rcar-v4l2.c > @@ -870,11 +870,9 @@ static int rvin_open(struct file *file) > struct rvin_dev *vin = video_drvdata(file); > int ret; > > - ret = pm_runtime_get_sync(vin->dev); > - if (ret < 0) { > - pm_runtime_put_noidle(vin->dev); > + ret = pm_runtime_resume_and_get(vin->dev); > + if (ret < 0) > return ret; > - } > > ret = mutex_lock_interruptible(&vin->lock); > if (ret) > -- > 2.30.2 >
Hi Niklas, Em Tue, 27 Apr 2021 22:12:30 +0200 Niklas Söderlund <niklas.soderlund@ragnatech.se> escreveu: > Hi Mauro, > > On 2021-04-27 12:27:08 +0200, Mauro Carvalho Chehab wrote: > > Commit dd8088d5a896 ("PM: runtime: Add pm_runtime_resume_and_get to deal with usage counter") > > added pm_runtime_resume_and_get() in order to automatically handle > > dev->power.usage_count decrement on errors. > > > > Use the new API, in order to cleanup the error check logic. > > > > Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> > > Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> > > --- > > drivers/media/platform/rcar-vin/rcar-csi2.c | 6 ++++++ > > drivers/media/platform/rcar-vin/rcar-dma.c | 6 ++---- > > drivers/media/platform/rcar-vin/rcar-v4l2.c | 6 ++---- > > 3 files changed, 10 insertions(+), 8 deletions(-) > > > > diff --git a/drivers/media/platform/rcar-vin/rcar-csi2.c b/drivers/media/platform/rcar-vin/rcar-csi2.c > > index e06cd512aba2..ce8e84f9e3d9 100644 > > --- a/drivers/media/platform/rcar-vin/rcar-csi2.c > > +++ b/drivers/media/platform/rcar-vin/rcar-csi2.c > > @@ -408,6 +408,12 @@ static void rcsi2_enter_standby(struct rcar_csi2 *priv) > > > > static void rcsi2_exit_standby(struct rcar_csi2 *priv) > > { > > + /* > > + * The code at rcsi2_enter_standby() assumes > > + * inconditionally that PM runtime usage count was > > + * incremented. So, it shouldn't use pm_runtime_resume_and_get() > > + * here. > > + */ > > pm_runtime_get_sync(priv->dev); > > I think this comment is a bit much. I won't object if you really want to > keep it but my preference would be to drop it. Hmm... I guess we could do this, instead: diff --git a/drivers/media/platform/rcar-vin/rcar-csi2.c b/drivers/media/platform/rcar-vin/rcar-csi2.c index e06cd512aba2..1fc2e6f4b607 100644 --- a/drivers/media/platform/rcar-vin/rcar-csi2.c +++ b/drivers/media/platform/rcar-vin/rcar-csi2.c @@ -406,9 +406,14 @@ static void rcsi2_enter_standby(struct rcar_csi2 *priv) pm_runtime_put(priv->dev); } -static void rcsi2_exit_standby(struct rcar_csi2 *priv) +static int rcsi2_exit_standby(struct rcar_csi2 *priv) { - pm_runtime_get_sync(priv->dev); + int ret; + + ret = pm_runtime_resume_and_get(priv->dev); + if (ret < 0) + return ret; + reset_control_deassert(priv->rstc); } @@ -657,7 +662,9 @@ static int rcsi2_start(struct rcar_csi2 *priv) { int ret; - rcsi2_exit_standby(priv); + ret = rcsi2_exit_standby(priv); + if (ret < 0) + return ret; ret = rcsi2_start_receiver(priv); if (ret) { Thanks, Mauro
diff --git a/drivers/media/platform/rcar-vin/rcar-csi2.c b/drivers/media/platform/rcar-vin/rcar-csi2.c index e06cd512aba2..ce8e84f9e3d9 100644 --- a/drivers/media/platform/rcar-vin/rcar-csi2.c +++ b/drivers/media/platform/rcar-vin/rcar-csi2.c @@ -408,6 +408,12 @@ static void rcsi2_enter_standby(struct rcar_csi2 *priv) static void rcsi2_exit_standby(struct rcar_csi2 *priv) { + /* + * The code at rcsi2_enter_standby() assumes + * inconditionally that PM runtime usage count was + * incremented. So, it shouldn't use pm_runtime_resume_and_get() + * here. + */ pm_runtime_get_sync(priv->dev); reset_control_deassert(priv->rstc); } diff --git a/drivers/media/platform/rcar-vin/rcar-dma.c b/drivers/media/platform/rcar-vin/rcar-dma.c index f30dafbdf61c..f5f722ab1d4e 100644 --- a/drivers/media/platform/rcar-vin/rcar-dma.c +++ b/drivers/media/platform/rcar-vin/rcar-dma.c @@ -1458,11 +1458,9 @@ int rvin_set_channel_routing(struct rvin_dev *vin, u8 chsel) u32 vnmc; int ret; - ret = pm_runtime_get_sync(vin->dev); - if (ret < 0) { - pm_runtime_put_noidle(vin->dev); + ret = pm_runtime_resume_and_get(vin->dev); + if (ret < 0) return ret; - } /* Make register writes take effect immediately. */ vnmc = rvin_read(vin, VNMC_REG); diff --git a/drivers/media/platform/rcar-vin/rcar-v4l2.c b/drivers/media/platform/rcar-vin/rcar-v4l2.c index 457a65bf6b66..b1e9f86caa5c 100644 --- a/drivers/media/platform/rcar-vin/rcar-v4l2.c +++ b/drivers/media/platform/rcar-vin/rcar-v4l2.c @@ -870,11 +870,9 @@ static int rvin_open(struct file *file) struct rvin_dev *vin = video_drvdata(file); int ret; - ret = pm_runtime_get_sync(vin->dev); - if (ret < 0) { - pm_runtime_put_noidle(vin->dev); + ret = pm_runtime_resume_and_get(vin->dev); + if (ret < 0) return ret; - } ret = mutex_lock_interruptible(&vin->lock); if (ret)
Commit dd8088d5a896 ("PM: runtime: Add pm_runtime_resume_and_get to deal with usage counter") added pm_runtime_resume_and_get() in order to automatically handle dev->power.usage_count decrement on errors. Use the new API, in order to cleanup the error check logic. Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> --- drivers/media/platform/rcar-vin/rcar-csi2.c | 6 ++++++ drivers/media/platform/rcar-vin/rcar-dma.c | 6 ++---- drivers/media/platform/rcar-vin/rcar-v4l2.c | 6 ++---- 3 files changed, 10 insertions(+), 8 deletions(-)