diff mbox series

[V2,3/8] drm/msm: Unconditionally call dev_pm_opp_of_remove_table()

Message ID 6e4110032f8711e8bb0acbeccfe66dec3b09d5c1.1598594714.git.viresh.kumar@linaro.org
State Accepted
Commit 6400a8e886c6a3ee0cfcbcdc0867a3e91186683c
Headers show
Series opp: Unconditionally call dev_pm_opp_of_remove_table() | expand

Commit Message

Viresh Kumar Aug. 28, 2020, 6:07 a.m. UTC
dev_pm_opp_of_remove_table() doesn't report any errors when it fails to
find the OPP table with error -ENODEV (i.e. OPP table not present for
the device). And we can call dev_pm_opp_of_remove_table()
unconditionally here.

While at it, also create a label to put clkname.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

---
V2:
- Compare with -ENODEV only for failures.
- Create new label to put clkname.
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 14 +++++---------
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h |  1 -
 drivers/gpu/drm/msm/dsi/dsi_host.c      |  8 ++------
 3 files changed, 7 insertions(+), 16 deletions(-)

Comments

Rajendra Nayak Sept. 1, 2020, 7:31 a.m. UTC | #1
On 8/28/2020 11:37 AM, Viresh Kumar wrote:
> dev_pm_opp_of_remove_table() doesn't report any errors when it fails to
> find the OPP table with error -ENODEV (i.e. OPP table not present for
> the device). And we can call dev_pm_opp_of_remove_table()
> unconditionally here.

Its a little tricky to call things unconditionally for this driver, more below.

> 
> While at it, also create a label to put clkname.
> 
> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
> 
> ---
> V2:
> - Compare with -ENODEV only for failures.
> - Create new label to put clkname.
> ---
>   drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 14 +++++---------
>   drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h |  1 -
>   drivers/gpu/drm/msm/dsi/dsi_host.c      |  8 ++------
>   3 files changed, 7 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> index c0a4d4e16d82..c8287191951f 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> @@ -1010,12 +1010,9 @@ static int dpu_bind(struct device *dev, struct device *master, void *data)
>   		return PTR_ERR(dpu_kms->opp_table);
>   	/* OPP table is optional */
>   	ret = dev_pm_opp_of_add_table(dev);
> -	if (!ret) {
> -		dpu_kms->has_opp_table = true;
> -	} else if (ret != -ENODEV) {
> +	if (ret && ret != -ENODEV) {
>   		dev_err(dev, "invalid OPP table in device tree\n");
> -		dev_pm_opp_put_clkname(dpu_kms->opp_table);
> -		return ret;
> +		goto put_clkname;

So FWIU, dpu_unbind() gets called even when dpu_bind() fails for some reason.
I tried to address that earlier [1] which I realized did not land. But with these changes
it will be even more broken unless we identify if we failed dpu_bind() before
adding the OPP table, while adding it, or all went well with opps and handle things
accordingly in dpu_unbind.

[1] https://lore.kernel.org/patchwork/patch/1275632/

>   	}
>   
>   	mp = &dpu_kms->mp;
> @@ -1037,8 +1034,8 @@ static int dpu_bind(struct device *dev, struct device *master, void *data)
>   	priv->kms = &dpu_kms->base;
>   	return ret;
>   err:
> -	if (dpu_kms->has_opp_table)
> -		dev_pm_opp_of_remove_table(dev);
> +	dev_pm_opp_of_remove_table(dev);
> +put_clkname:
>   	dev_pm_opp_put_clkname(dpu_kms->opp_table);
>   	return ret;
>   }
> @@ -1056,8 +1053,7 @@ static void dpu_unbind(struct device *dev, struct device *master, void *data)
>   	if (dpu_kms->rpm_enabled)
>   		pm_runtime_disable(&pdev->dev);
>   
> -	if (dpu_kms->has_opp_table)
> -		dev_pm_opp_of_remove_table(dev);
> +	dev_pm_opp_of_remove_table(dev);
>   	dev_pm_opp_put_clkname(dpu_kms->opp_table);
>   }
>   
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
> index e140cd633071..8295979a7165 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
> @@ -129,7 +129,6 @@ struct dpu_kms {
>   	bool rpm_enabled;
>   
>   	struct opp_table *opp_table;
> -	bool has_opp_table;
>   
>   	struct dss_module_power mp;
>   
> diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
> index b17ac6c27554..4335fe33250c 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi_host.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
> @@ -113,7 +113,6 @@ struct msm_dsi_host {
>   	struct clk *byte_intf_clk;
>   
>   	struct opp_table *opp_table;
> -	bool has_opp_table;
>   
>   	u32 byte_clk_rate;
>   	u32 pixel_clk_rate;
> @@ -1891,9 +1890,7 @@ int msm_dsi_host_init(struct msm_dsi *msm_dsi)
>   		return PTR_ERR(msm_host->opp_table);
>   	/* OPP table is optional */
>   	ret = dev_pm_opp_of_add_table(&pdev->dev);
> -	if (!ret) {
> -		msm_host->has_opp_table = true;
> -	} else if (ret != -ENODEV) {
> +	if (ret && ret != -ENODEV) {
>   		dev_err(&pdev->dev, "invalid OPP table in device tree\n");
>   		dev_pm_opp_put_clkname(msm_host->opp_table);
>   		return ret;
> @@ -1934,8 +1931,7 @@ void msm_dsi_host_destroy(struct mipi_dsi_host *host)
>   	mutex_destroy(&msm_host->cmd_mutex);
>   	mutex_destroy(&msm_host->dev_mutex);
>   
> -	if (msm_host->has_opp_table)
> -		dev_pm_opp_of_remove_table(&msm_host->pdev->dev);
> +	dev_pm_opp_of_remove_table(&msm_host->pdev->dev);
>   	dev_pm_opp_put_clkname(msm_host->opp_table);
>   	pm_runtime_disable(&msm_host->pdev->dev);
>   }
>
Viresh Kumar Oct. 5, 2020, 6:26 a.m. UTC | #2
On 28-08-20, 11:37, Viresh Kumar wrote:
> dev_pm_opp_of_remove_table() doesn't report any errors when it fails to
> find the OPP table with error -ENODEV (i.e. OPP table not present for
> the device). And we can call dev_pm_opp_of_remove_table()
> unconditionally here.
> 
> While at it, also create a label to put clkname.
> 
> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

Can someone please apply this and the other drm patch (2/8) ?
Viresh Kumar Oct. 21, 2020, 7:24 a.m. UTC | #3
On 05-10-20, 11:56, Viresh Kumar wrote:
> On 28-08-20, 11:37, Viresh Kumar wrote:
> > dev_pm_opp_of_remove_table() doesn't report any errors when it fails to
> > find the OPP table with error -ENODEV (i.e. OPP table not present for
> > the device). And we can call dev_pm_opp_of_remove_table()
> > unconditionally here.
> > 
> > While at it, also create a label to put clkname.
> > 
> > Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
> 
> Can someone please apply this and the other drm patch (2/8) ?

Rob/Rajendra, can someone please have a look at these patches ?
Rob Clark Oct. 21, 2020, 4:58 p.m. UTC | #4
On Wed, Oct 21, 2020 at 12:24 AM Viresh Kumar <viresh.kumar@linaro.org> wrote:
>
> On 05-10-20, 11:56, Viresh Kumar wrote:
> > On 28-08-20, 11:37, Viresh Kumar wrote:
> > > dev_pm_opp_of_remove_table() doesn't report any errors when it fails to
> > > find the OPP table with error -ENODEV (i.e. OPP table not present for
> > > the device). And we can call dev_pm_opp_of_remove_table()
> > > unconditionally here.
> > >
> > > While at it, also create a label to put clkname.
> > >
> > > Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
> >
> > Can someone please apply this and the other drm patch (2/8) ?
>
> Rob/Rajendra, can someone please have a look at these patches ?

Oh, sorry I missed that, could someone re-send it and CC
freedreno@lists.freedesktop.org so it shows up in patchworks.. that is
more reliable counting on me to not overlook something in my mail

BR,
-R
Viresh Kumar Oct. 22, 2020, 5:12 a.m. UTC | #5
On 21-10-20, 09:58, Rob Clark wrote:
> On Wed, Oct 21, 2020 at 12:24 AM Viresh Kumar <viresh.kumar@linaro.org> wrote:
> >
> > On 05-10-20, 11:56, Viresh Kumar wrote:
> > > On 28-08-20, 11:37, Viresh Kumar wrote:
> > > > dev_pm_opp_of_remove_table() doesn't report any errors when it fails to
> > > > find the OPP table with error -ENODEV (i.e. OPP table not present for
> > > > the device). And we can call dev_pm_opp_of_remove_table()
> > > > unconditionally here.
> > > >
> > > > While at it, also create a label to put clkname.
> > > >
> > > > Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
> > >
> > > Can someone please apply this and the other drm patch (2/8) ?
> >
> > Rob/Rajendra, can someone please have a look at these patches ?
> 
> Oh, sorry I missed that, could someone re-send it and CC
> freedreno@lists.freedesktop.org so it shows up in patchworks.. that is
> more reliable counting on me to not overlook something in my mail

I have just bounced it back to you and freedreno was already cc'd,
though I have bounced it there again.
diff mbox series

Patch

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
index c0a4d4e16d82..c8287191951f 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
@@ -1010,12 +1010,9 @@  static int dpu_bind(struct device *dev, struct device *master, void *data)
 		return PTR_ERR(dpu_kms->opp_table);
 	/* OPP table is optional */
 	ret = dev_pm_opp_of_add_table(dev);
-	if (!ret) {
-		dpu_kms->has_opp_table = true;
-	} else if (ret != -ENODEV) {
+	if (ret && ret != -ENODEV) {
 		dev_err(dev, "invalid OPP table in device tree\n");
-		dev_pm_opp_put_clkname(dpu_kms->opp_table);
-		return ret;
+		goto put_clkname;
 	}
 
 	mp = &dpu_kms->mp;
@@ -1037,8 +1034,8 @@  static int dpu_bind(struct device *dev, struct device *master, void *data)
 	priv->kms = &dpu_kms->base;
 	return ret;
 err:
-	if (dpu_kms->has_opp_table)
-		dev_pm_opp_of_remove_table(dev);
+	dev_pm_opp_of_remove_table(dev);
+put_clkname:
 	dev_pm_opp_put_clkname(dpu_kms->opp_table);
 	return ret;
 }
@@ -1056,8 +1053,7 @@  static void dpu_unbind(struct device *dev, struct device *master, void *data)
 	if (dpu_kms->rpm_enabled)
 		pm_runtime_disable(&pdev->dev);
 
-	if (dpu_kms->has_opp_table)
-		dev_pm_opp_of_remove_table(dev);
+	dev_pm_opp_of_remove_table(dev);
 	dev_pm_opp_put_clkname(dpu_kms->opp_table);
 }
 
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
index e140cd633071..8295979a7165 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
@@ -129,7 +129,6 @@  struct dpu_kms {
 	bool rpm_enabled;
 
 	struct opp_table *opp_table;
-	bool has_opp_table;
 
 	struct dss_module_power mp;
 
diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
index b17ac6c27554..4335fe33250c 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -113,7 +113,6 @@  struct msm_dsi_host {
 	struct clk *byte_intf_clk;
 
 	struct opp_table *opp_table;
-	bool has_opp_table;
 
 	u32 byte_clk_rate;
 	u32 pixel_clk_rate;
@@ -1891,9 +1890,7 @@  int msm_dsi_host_init(struct msm_dsi *msm_dsi)
 		return PTR_ERR(msm_host->opp_table);
 	/* OPP table is optional */
 	ret = dev_pm_opp_of_add_table(&pdev->dev);
-	if (!ret) {
-		msm_host->has_opp_table = true;
-	} else if (ret != -ENODEV) {
+	if (ret && ret != -ENODEV) {
 		dev_err(&pdev->dev, "invalid OPP table in device tree\n");
 		dev_pm_opp_put_clkname(msm_host->opp_table);
 		return ret;
@@ -1934,8 +1931,7 @@  void msm_dsi_host_destroy(struct mipi_dsi_host *host)
 	mutex_destroy(&msm_host->cmd_mutex);
 	mutex_destroy(&msm_host->dev_mutex);
 
-	if (msm_host->has_opp_table)
-		dev_pm_opp_of_remove_table(&msm_host->pdev->dev);
+	dev_pm_opp_of_remove_table(&msm_host->pdev->dev);
 	dev_pm_opp_put_clkname(msm_host->opp_table);
 	pm_runtime_disable(&msm_host->pdev->dev);
 }