[PATCH v3 2/2] drm/probe_helper: warning on poll_enabled for issue catching

[PATCH v3 2/2] drm/probe_helper: warning on poll_enabled for issue catching

[Guchun Chen]

In order to catch issues in other drivers to ensure proper call
sequence of polling function.

v2: drop Fixes tag in commit message

Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/2411
Reported-by: Bert Karwatzki <spasswolf@web.de>
Suggested-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Guchun Chen <guchun.chen@amd.com>
---
 drivers/gpu/drm/drm_probe_helper.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c
index 8127be134c39..85e0e80d4a52 100644
--- a/drivers/gpu/drm/drm_probe_helper.c
+++ b/drivers/gpu/drm/drm_probe_helper.c
@@ -852,6 +852,8 @@ EXPORT_SYMBOL(drm_kms_helper_is_poll_worker);
  */
 void drm_kms_helper_poll_disable(struct drm_device *dev)
 {
+	WARN_ON(!dev->mode_config.poll_enabled);
+
 	if (dev->mode_config.poll_running)
 		drm_kms_helper_disable_hpd(dev);
 
-- 
2.25.1

RE: [PATCH v3 2/2] drm/probe_helper: warning on poll_enabled for issue catching

[Quan, Evan]

[AMD Official Use Only - General]

Series is acked-by: Evan Quan <evan.quan@amd.com>

> -----Original Message-----
> From: amd-gfx <amd-gfx-bounces@lists.freedesktop.org> On Behalf Of
> Guchun Chen
> Sent: Friday, March 10, 2023 9:02 AM
> To: amd-gfx@lists.freedesktop.org; dri-devel@lists.freedesktop.org;
> Deucher, Alexander <Alexander.Deucher@amd.com>; Zhang, Hawking
> <Hawking.Zhang@amd.com>; dmitry.baryshkov@linaro.org;
> spasswolf@web.de; mike@fireburn.co.uk
> Cc: Chen, Guchun <Guchun.Chen@amd.com>
> Subject: [PATCH v3 2/2] drm/probe_helper: warning on poll_enabled for
> issue catching
> 
> In order to catch issues in other drivers to ensure proper call sequence of
> polling function.
> 
> v2: drop Fixes tag in commit message
> 
> Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/2411
> Reported-by: Bert Karwatzki <spasswolf@web.de>
> Suggested-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> Signed-off-by: Guchun Chen <guchun.chen@amd.com>
> ---
>  drivers/gpu/drm/drm_probe_helper.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_probe_helper.c
> b/drivers/gpu/drm/drm_probe_helper.c
> index 8127be134c39..85e0e80d4a52 100644
> --- a/drivers/gpu/drm/drm_probe_helper.c
> +++ b/drivers/gpu/drm/drm_probe_helper.c
> @@ -852,6 +852,8 @@ EXPORT_SYMBOL(drm_kms_helper_is_poll_worker);
>   */
>  void drm_kms_helper_poll_disable(struct drm_device *dev)  {
> +	WARN_ON(!dev->mode_config.poll_enabled);
> +
>  	if (dev->mode_config.poll_running)
>  		drm_kms_helper_disable_hpd(dev);
> 
> --
> 2.25.1

Re: [PATCH v3 2/2] drm/probe_helper: warning on poll_enabled for issue catching

[Jani Nikula]

On Fri, 10 Mar 2023, Guchun Chen <guchun.chen@amd.com> wrote:
> In order to catch issues in other drivers to ensure proper call
> sequence of polling function.
>
> v2: drop Fixes tag in commit message
>
> Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/2411
> Reported-by: Bert Karwatzki <spasswolf@web.de>
> Suggested-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> Signed-off-by: Guchun Chen <guchun.chen@amd.com>
> ---
>  drivers/gpu/drm/drm_probe_helper.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c
> index 8127be134c39..85e0e80d4a52 100644
> --- a/drivers/gpu/drm/drm_probe_helper.c
> +++ b/drivers/gpu/drm/drm_probe_helper.c
> @@ -852,6 +852,8 @@ EXPORT_SYMBOL(drm_kms_helper_is_poll_worker);
>   */
>  void drm_kms_helper_poll_disable(struct drm_device *dev)
>  {
> +	WARN_ON(!dev->mode_config.poll_enabled);

Please address all previous review comments [1].

BR,
Jani.


[1] https://lore.kernel.org/r/87o7p3bde6.fsf@intel.com


> +
>  	if (dev->mode_config.poll_running)
>  		drm_kms_helper_disable_hpd(dev);

-- 
Jani Nikula, Intel Open Source Graphics Center

RE: [PATCH v3 2/2] drm/probe_helper: warning on poll_enabled for issue catching

[Chen, Guchun]

> -----Original Message-----
> From: Jani Nikula <jani.nikula@linux.intel.com>
> Sent: Friday, March 10, 2023 8:05 PM
> To: Chen, Guchun <Guchun.Chen@amd.com>; amd-
> gfx@lists.freedesktop.org; dri-devel@lists.freedesktop.org; Deucher,
> Alexander <Alexander.Deucher@amd.com>; Zhang, Hawking
> <Hawking.Zhang@amd.com>; dmitry.baryshkov@linaro.org;
> spasswolf@web.de; mike@fireburn.co.uk
> Cc: Chen, Guchun <Guchun.Chen@amd.com>
> Subject: Re: [PATCH v3 2/2] drm/probe_helper: warning on poll_enabled for
> issue catching
> 
> On Fri, 10 Mar 2023, Guchun Chen <guchun.chen@amd.com> wrote:
> > In order to catch issues in other drivers to ensure proper call
> > sequence of polling function.
> >
> > v2: drop Fixes tag in commit message
> >
> > Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/2411
> > Reported-by: Bert Karwatzki <spasswolf@web.de>
> > Suggested-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> > Signed-off-by: Guchun Chen <guchun.chen@amd.com>
> > ---
> >  drivers/gpu/drm/drm_probe_helper.c | 2 ++
> >  1 file changed, 2 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/drm_probe_helper.c
> > b/drivers/gpu/drm/drm_probe_helper.c
> > index 8127be134c39..85e0e80d4a52 100644
> > --- a/drivers/gpu/drm/drm_probe_helper.c
> > +++ b/drivers/gpu/drm/drm_probe_helper.c
> > @@ -852,6 +852,8 @@
> EXPORT_SYMBOL(drm_kms_helper_is_poll_worker);
> >   */
> >  void drm_kms_helper_poll_disable(struct drm_device *dev)  {
> > +	WARN_ON(!dev->mode_config.poll_enabled);
> 
> Please address all previous review comments [1].

Sorry for missing your previous review email. Will address it in next patch set.

Regards,
Guchun

> BR,
> Jani.
> 
> 
> [1] https://lore.kernel.org/r/87o7p3bde6.fsf@intel.com
> 
> 
> > +
> >  	if (dev->mode_config.poll_running)
> >  		drm_kms_helper_disable_hpd(dev);
> 
> --
> Jani Nikula, Intel Open Source Graphics Center