[PATCH] drm/meson: Convert to Linux IRQ interfaces

[PATCH] drm/meson: Convert to Linux IRQ interfaces

[Thomas Zimmermann]

Drop the DRM IRQ midlayer in favor of Linux IRQ interfaces. DRM's
IRQ helpers are mostly useful for UMS drivers. Modern KMS drivers
don't benefit from using it.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
---
 drivers/gpu/drm/meson/meson_drv.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/meson/meson_drv.c b/drivers/gpu/drm/meson/meson_drv.c
index 3d0ccc7eef1b..bc0d60df04ae 100644
--- a/drivers/gpu/drm/meson/meson_drv.c
+++ b/drivers/gpu/drm/meson/meson_drv.c
@@ -21,7 +21,6 @@
 #include <drm/drm_fb_helper.h>
 #include <drm/drm_gem_cma_helper.h>
 #include <drm/drm_gem_framebuffer_helper.h>
-#include <drm/drm_irq.h>
 #include <drm/drm_modeset_helper_vtables.h>
 #include <drm/drm_probe_helper.h>
 #include <drm/drm_vblank.h>
@@ -94,9 +93,6 @@ DEFINE_DRM_GEM_CMA_FOPS(fops);
 static const struct drm_driver meson_driver = {
 	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
 
-	/* IRQ */
-	.irq_handler		= meson_irq,
-
 	/* CMA Ops */
 	DRM_GEM_CMA_DRIVER_OPS_WITH_DUMB_CREATE(meson_dumb_create),
 
@@ -335,7 +331,7 @@ static int meson_drv_bind_master(struct device *dev, bool has_components)
 	if (ret)
 		goto free_drm;
 
-	ret = drm_irq_install(drm, priv->vsync_irq);
+	ret = request_irq(priv->vsync_irq, meson_irq, 0, drm->driver->name, drm);
 	if (ret)
 		goto free_drm;
 
@@ -354,7 +350,7 @@ static int meson_drv_bind_master(struct device *dev, bool has_components)
 	return 0;
 
 uninstall_irq:
-	drm_irq_uninstall(drm);
+	free_irq(priv->vsync_irq, drm);
 free_drm:
 	drm_dev_put(drm);
 
@@ -382,7 +378,7 @@ static void meson_drv_unbind(struct device *dev)
 	drm_kms_helper_poll_fini(drm);
 	drm_atomic_helper_shutdown(drm);
 	component_unbind_all(dev, drm);
-	drm_irq_uninstall(drm);
+	free_irq(priv->vsync_irq, drm);
 	drm_dev_put(drm);
 
 	if (priv->afbcd.ops) {
-- 
2.32.0


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Re: [PATCH] drm/meson: Convert to Linux IRQ interfaces

[Neil Armstrong]

Hi,

Le 06/07/2021 à 09:45, Thomas Zimmermann a écrit :
> Drop the DRM IRQ midlayer in favor of Linux IRQ interfaces. DRM's
> IRQ helpers are mostly useful for UMS drivers. Modern KMS drivers
> don't benefit from using it.
> 
> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
> ---
>  drivers/gpu/drm/meson/meson_drv.c | 10 +++-------
>  1 file changed, 3 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/gpu/drm/meson/meson_drv.c b/drivers/gpu/drm/meson/meson_drv.c
> index 3d0ccc7eef1b..bc0d60df04ae 100644
> --- a/drivers/gpu/drm/meson/meson_drv.c
> +++ b/drivers/gpu/drm/meson/meson_drv.c
> @@ -21,7 +21,6 @@
>  #include <drm/drm_fb_helper.h>
>  #include <drm/drm_gem_cma_helper.h>
>  #include <drm/drm_gem_framebuffer_helper.h>
> -#include <drm/drm_irq.h>
>  #include <drm/drm_modeset_helper_vtables.h>
>  #include <drm/drm_probe_helper.h>
>  #include <drm/drm_vblank.h>
> @@ -94,9 +93,6 @@ DEFINE_DRM_GEM_CMA_FOPS(fops);
>  static const struct drm_driver meson_driver = {
>  	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
>  
> -	/* IRQ */
> -	.irq_handler		= meson_irq,
> -
>  	/* CMA Ops */
>  	DRM_GEM_CMA_DRIVER_OPS_WITH_DUMB_CREATE(meson_dumb_create),
>  
> @@ -335,7 +331,7 @@ static int meson_drv_bind_master(struct device *dev, bool has_components)
>  	if (ret)
>  		goto free_drm;
>  
> -	ret = drm_irq_install(drm, priv->vsync_irq);
> +	ret = request_irq(priv->vsync_irq, meson_irq, 0, drm->driver->name, drm);
>  	if (ret)
>  		goto free_drm;
>  
> @@ -354,7 +350,7 @@ static int meson_drv_bind_master(struct device *dev, bool has_components)
>  	return 0;
>  
>  uninstall_irq:
> -	drm_irq_uninstall(drm);
> +	free_irq(priv->vsync_irq, drm);
>  free_drm:
>  	drm_dev_put(drm);
>  
> @@ -382,7 +378,7 @@ static void meson_drv_unbind(struct device *dev)
>  	drm_kms_helper_poll_fini(drm);
>  	drm_atomic_helper_shutdown(drm);
>  	component_unbind_all(dev, drm);
> -	drm_irq_uninstall(drm);
> +	free_irq(priv->vsync_irq, drm);
>  	drm_dev_put(drm);
>  
>  	if (priv->afbcd.ops) {
> 

Looks good !

Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>

Thanks,
Neil

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Re: [PATCH] drm/meson: Convert to Linux IRQ interfaces

[Martin Blumenstingl]

Hi Thomas,

On Tue, Jul 6, 2021 at 9:45 AM Thomas Zimmermann <tzimmermann@suse.de> wrote:
>
> Drop the DRM IRQ midlayer in favor of Linux IRQ interfaces. DRM's
> IRQ helpers are mostly useful for UMS drivers. Modern KMS drivers
> don't benefit from using it.
>
> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Tested-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
and also (although I am no drm subsystem expert):
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>

[...]
> -       ret = drm_irq_install(drm, priv->vsync_irq);
> +       ret = request_irq(priv->vsync_irq, meson_irq, 0, drm->driver->name, drm);
I'd like to use dev_name(dev) instead of drm->driver->name in the
future as that'll make it much easier to identify the corresponding
IRQ in /proc/interrupts for example
your patch makes this possible - thanks for this!


Best regards,
Martin

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Re: [PATCH] drm/meson: Convert to Linux IRQ interfaces

[Thomas Zimmermann]

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Hi

Am 08.07.21 um 15:31 schrieb Martin Blumenstingl:
> Hi Thomas,
> 
> On Tue, Jul 6, 2021 at 9:45 AM Thomas Zimmermann <tzimmermann@suse.de> wrote:
>>
>> Drop the DRM IRQ midlayer in favor of Linux IRQ interfaces. DRM's
>> IRQ helpers are mostly useful for UMS drivers. Modern KMS drivers
>> don't benefit from using it.
>>
>> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
> Tested-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
> and also (although I am no drm subsystem expert):
> Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
> 

Oh, just when I committed the patch. But thanks for your reply.


> [...]
>> -       ret = drm_irq_install(drm, priv->vsync_irq);
>> +       ret = request_irq(priv->vsync_irq, meson_irq, 0, drm->driver->name, drm);
> I'd like to use dev_name(dev) instead of drm->driver->name in the
> future as that'll make it much easier to identify the corresponding
> IRQ in /proc/interrupts for example
> your patch makes this possible - thanks for this!

I also thought about this, but every driver in DRM and apparently most 
drivers in general pass the driver's name here. I think the change would 
make a lot of sense, but it's probably worth a kernel-wide effort.

Best regards
Thomas

> 
> 
> Best regards,
> Martin
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer


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