On Thursday 13 June 2013 08:44 PM, Stephen Warren wrote:
On 06/13/2013 03:53 AM, Mayuresh Kulkarni wrote:
Patch description?
I thought the patch subject is sufficient to tell what it is it doing.
Description here would be repetition in my opinion.
Also, the cover letter for the patch-set series is verbose enough.
diff --git a/drivers/gpu/host1x/drm/gr2d.c b/drivers/gpu/host1x/drm/gr2d.c
+#ifdef CONFIG_PM_RUNTIME
+ pm_runtime_enable(&pdev->dev);
+ pm_runtime_get_sync(&pdev->dev);
+#else
err = clk_prepare_enable(gr2d->clk);
if (err) {
dev_err(dev, "cannot turn on clock\n");
return err;
}
+#endif
The #else block here is a cut/paste of the body of
gr2d_runtime_resume(). It'd be better to call that function instead. The
following is what I ended up with in the Tegra ASoC driver in order to
support runtime PM on or off:
pm_runtime_enable(&pdev->dev);
if (!pm_runtime_enabled(&pdev->dev)) {
ret = tegra20_i2s_runtime_resume(&pdev->dev);
if (ret)
goto err_pm_disable;
}
Thanks for the tip. Runtime detection is better than compile time here.
@@ -328,10 +338,51 @@ static int __exit gr2d_remove(struct platform_device
*pdev)
host1x_channel_free(gr2d->channel);
clk_disable_unprepare(gr2d->clk);
Don't you need to remove that clk disable, or make it conditional upon
!PM_RUNTIME?
Yes you are correct.
+#ifdef CONFIG_PM_RUNTIME
+ pm_runtime_disable(&pdev->dev);
+#endif
Similarly, perhaps something like the following here:
pm_runtime_disable(&pdev->dev);
if (!pm_runtime_status_suspended(&pdev->dev))
tegra20_i2s_runtime_suspend(&pdev->dev);
@ -591,10 +592,18 @@ int host1x_job_submit(struct host1x_job *job)
{
struct host1x *host = dev_get_drvdata(job->channel->dev->parent);
+#ifdef CONFIG_PM_RUNTIME
+ pm_runtime_get_sync(job->channel->dev);
+#endif
+
return host1x_hw_channel_submit(host, job);
}
int host1x_job_complete(struct host1x_job *job)
{
+#ifdef CONFIG_PM_RUNTIME
+ return pm_runtime_put(job->channel->dev);
+#else
return 0;
+#endif
}
I don't think you need any of those ifdefs; simply call the
pm_runtime_*() functions all the time, and they'll be successful no-ops
if !PM_RUNTIME.
OK. But I thought it will be better to be verbose (which is not needed).
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