[PATCH v3] drm/msm/dpu: Only create debugfs for PRIMARY minor

[Stephen Boyd]

Quoting Dmitry Baryshkov (2022-02-11 16:38:11)
> From: Bjorn Andersson <bjorn.andersson at linaro.org>
>
> dpu_kms_debugfs_init() is invoked for each minor being registered. Most
> of the files created are unrelated to the minor, so there's no reason to
> present them per minor.
> The exception to this is the DisplayPort code, which ends up invoking
> dp_debug_get() for each minor, each time associate the allocated object
> with dp->debug.
>
> As such dp_debug will create debugfs files in both the PRIMARY and the
> RENDER minor's debugfs directory, but only the last reference will be
> remembered.
>
> The only use of this reference today is in the cleanup path in
> dp_display_deinit_sub_modules() and the dp_debug_private object does
> outlive the debugfs entries in either case, so there doesn't seem to be
> any adverse effects of this, but per the code the current behavior is
> unexpected, so change it to only create debugfs files for the PRIMARY
> minor.
>
> Signed-off-by: Bjorn Andersson <bjorn.andersson at linaro.org>
> [DB: slightly change description and in-patch comment]
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
> ---

Reviewed-by: Stephen Boyd <swboyd at chromium.org>