One needs to set "(struct drm_device *)->irq_enabled = true" to signal drm core
to enable vblank interrupts after the hardware has been initialized.
Correspondingly, one needs to disable vblank interrupts by setting
"(struct drm_device *)->irq_enabled = false" at the beginning of the
de-initializing routine.
Signed-off-by: Ayan Kumar halder <[email protected]>
---
drivers/gpu/drm/arm/display/komeda/komeda_kms.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_kms.c b/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
index 7b5cde14e3ba..b4fd8ee0d05f 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
@@ -204,6 +204,8 @@ struct komeda_kms_dev *komeda_kms_attach(struct komeda_dev *mdev)
if (err)
goto uninstall_irq;
+ drm->irq_enabled = true;
+
err = drm_dev_register(drm, 0);
if (err)
goto uninstall_irq;
@@ -211,6 +213,7 @@ struct komeda_kms_dev *komeda_kms_attach(struct komeda_dev *mdev)
return kms;
uninstall_irq:
+ drm->irq_enabled = false;
drm_irq_uninstall(drm);
cleanup_mode_config:
drm_mode_config_cleanup(drm);
@@ -225,6 +228,7 @@ void komeda_kms_detach(struct komeda_kms_dev *kms)
struct drm_device *drm = &kms->base;
struct komeda_dev *mdev = drm->dev_private;
+ drm->irq_enabled = false;
mdev->funcs->disable_irq(mdev);
drm_dev_unregister(drm);
drm_irq_uninstall(drm);
--
2.21.0
On Fri, Jun 07, 2019 at 03:03:39PM +0000, Ayan Halder wrote:
> One needs to set "(struct drm_device *)->irq_enabled = true" to signal drm core
> to enable vblank interrupts after the hardware has been initialized.
> Correspondingly, one needs to disable vblank interrupts by setting
> "(struct drm_device *)->irq_enabled = false" at the beginning of the
> de-initializing routine.
Only if you don't use the drm_irq_install helper. Quoting the kerneldoc in
full:
/**
* @irq_enabled:
*
* Indicates that interrupt handling is enabled, specifically vblank
* handling. Drivers which don't use drm_irq_install() need to set this
* to true manually.
*/
bool irq_enabled;
Not entirely sure where you've found your quote, but it's not complete.
Cheers, Daniel
>
> Signed-off-by: Ayan Kumar halder <[email protected]>
> ---
> drivers/gpu/drm/arm/display/komeda/komeda_kms.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_kms.c b/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
> index 7b5cde14e3ba..b4fd8ee0d05f 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
> @@ -204,6 +204,8 @@ struct komeda_kms_dev *komeda_kms_attach(struct komeda_dev *mdev)
> if (err)
> goto uninstall_irq;
>
> + drm->irq_enabled = true;
> +
> err = drm_dev_register(drm, 0);
> if (err)
> goto uninstall_irq;
> @@ -211,6 +213,7 @@ struct komeda_kms_dev *komeda_kms_attach(struct komeda_dev *mdev)
> return kms;
>
> uninstall_irq:
> + drm->irq_enabled = false;
> drm_irq_uninstall(drm);
> cleanup_mode_config:
> drm_mode_config_cleanup(drm);
> @@ -225,6 +228,7 @@ void komeda_kms_detach(struct komeda_kms_dev *kms)
> struct drm_device *drm = &kms->base;
> struct komeda_dev *mdev = drm->dev_private;
>
> + drm->irq_enabled = false;
> mdev->funcs->disable_irq(mdev);
> drm_dev_unregister(drm);
> drm_irq_uninstall(drm);
> --
> 2.21.0
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
On Fri, Jun 07, 2019 at 08:18:56PM +0200, Daniel Vetter wrote:
Hi Daniel,
> On Fri, Jun 07, 2019 at 03:03:39PM +0000, Ayan Halder wrote:
> > One needs to set "(struct drm_device *)->irq_enabled = true" to signal drm core
> > to enable vblank interrupts after the hardware has been initialized.
> > Correspondingly, one needs to disable vblank interrupts by setting
> > "(struct drm_device *)->irq_enabled = false" at the beginning of the
> > de-initializing routine.
>
> Only if you don't use the drm_irq_install helper. Quoting the kerneldoc in
> full:
>
> /**
> * @irq_enabled:
> *
> * Indicates that interrupt handling is enabled, specifically vblank
> * handling. Drivers which don't use drm_irq_install() need to set this
> * to true manually.
> */
> bool irq_enabled;
>
> Not entirely sure where you've found your quote, but it's not complete.
>
> Cheers, Daniel
Thanks for your review.
That was my quote which reflects my half-baked understanding of the
issue :(. I had missed reading the header files.
That said, I will squash my previous patch "drm/komeda: Avoid using
DRIVER_IRQ_SHARED" into this one as the current patch is a consequence
of the changes made in the previous patch.
Regards,
Ayan Kumar Halder
>
> >
> > Signed-off-by: Ayan Kumar halder <[email protected]>
> > ---
> > drivers/gpu/drm/arm/display/komeda/komeda_kms.c | 4 ++++
> > 1 file changed, 4 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_kms.c b/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
> > index 7b5cde14e3ba..b4fd8ee0d05f 100644
> > --- a/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
> > +++ b/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
> > @@ -204,6 +204,8 @@ struct komeda_kms_dev *komeda_kms_attach(struct komeda_dev *mdev)
> > if (err)
> > goto uninstall_irq;
> >
> > +drm->irq_enabled = true;
> > +
> > err = drm_dev_register(drm, 0);
> > if (err)
> > goto uninstall_irq;
> > @@ -211,6 +213,7 @@ struct komeda_kms_dev *komeda_kms_attach(struct komeda_dev *mdev)
> > return kms;
> >
> > uninstall_irq:
> > +drm->irq_enabled = false;
> > drm_irq_uninstall(drm);
> > cleanup_mode_config:
> > drm_mode_config_cleanup(drm);
> > @@ -225,6 +228,7 @@ void komeda_kms_detach(struct komeda_kms_dev *kms)
> > struct drm_device *drm = &kms->base;
> > struct komeda_dev *mdev = drm->dev_private;
> >
> > +drm->irq_enabled = false;
> > mdev->funcs->disable_irq(mdev);
> > drm_dev_unregister(drm);
> > drm_irq_uninstall(drm);
> > --
> > 2.21.0
> >
>
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch
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