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

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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@xxxxxxxxxx>

---
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);
  }


--
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