linux-kernel - Re: [PATCH v2] drm/komeda: Make Komeda interrupts shareable

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Message-ID: <20190613162927.GS4173@e110455-lin.cambridge.arm.com>
Date:   Thu, 13 Jun 2019 17:29:27 +0100
From:   Liviu Dudau <Liviu.Dudau@....com>
To:     Ayan Halder <Ayan.Halder@....com>
Cc:     "james qian wang (Arm Technology China)" <james.qian.wang@....com>,
        Brian Starkey <Brian.Starkey@....com>,
        "airlied@...ux.ie" <airlied@...ux.ie>,
        "daniel@...ll.ch" <daniel@...ll.ch>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        nd <nd@....com>
Subject: Re: [PATCH v2] drm/komeda: Make Komeda interrupts shareable

On Thu, Jun 13, 2019 at 04:13:10PM +0100, Ayan Halder wrote:
> Komeda interrupts may be shared with other hardware blocks.
> One needs to use devm_request_irq() with IRQF_SHARED to create a shared
>  interrupt handler.
> As a result of not using drm_irq_install() api, one needs to set
> "(struct drm_device *)->irq_enabled = true/false" to enable/disable
> vblank interrupts.
> 
> Changes from v1:-
> 1. Squashed the following two patches into one (as the second patch is a
> consequence of the first one):-
>    drm/komeda: Avoid using DRIVER_IRQ_SHARED
>    drm/komeda: Enable/Disable vblank interrupts
> 2. Fixed the commit message (as pointed by Daniel Vetter)
> 3. Removed calls to 'drm_irq_uninstall()' as we are no longer using
> drm_irq_install()
> 4. Removed the struct member 'komeda_kms_driver.irq_handler' as it is not
> used anywhere.
> 
> Signed-off-by: Ayan Kumar halder <ayan.halder@....com>

Reviewed-by: Liviu Dudau <liviu.dudau@....com>

> ---
>  drivers/gpu/drm/arm/display/komeda/komeda_kms.c | 16 +++++++++-------
>  1 file changed, 9 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_kms.c b/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
> index 86f6542afb40..bb2bffc0e022 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
> @@ -58,7 +58,6 @@ static struct drm_driver komeda_kms_driver = {
>  	.driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC |
>  			   DRIVER_PRIME | DRIVER_HAVE_IRQ,
>  	.lastclose			= drm_fb_helper_lastclose,
> -	.irq_handler			= komeda_kms_irq_handler,
>  	.gem_free_object_unlocked	= drm_gem_cma_free_object,
>  	.gem_vm_ops			= &drm_gem_cma_vm_ops,
>  	.dumb_create			= komeda_gem_cma_dumb_create,
> @@ -194,23 +193,26 @@ struct komeda_kms_dev *komeda_kms_attach(struct komeda_dev *mdev)
>  
>  	drm_mode_config_reset(drm);
>  
> -	err = drm_irq_install(drm, mdev->irq);
> +	err = devm_request_irq(drm->dev, mdev->irq,
> +			       komeda_kms_irq_handler, IRQF_SHARED,
> +			       drm->driver->name, drm);
>  	if (err)
>  		goto cleanup_mode_config;
>  
>  	err = mdev->funcs->enable_irq(mdev);
>  	if (err)
> -		goto uninstall_irq;
> +		goto cleanup_mode_config;
> +
> +	drm->irq_enabled = true;
>  
>  	err = drm_dev_register(drm, 0);
>  	if (err)
> -		goto uninstall_irq;
> +		goto cleanup_mode_config;
>  
>  	return kms;
>  
> -uninstall_irq:
> -	drm_irq_uninstall(drm);
>  cleanup_mode_config:
> +	drm->irq_enabled = false;
>  	drm_mode_config_cleanup(drm);
>  	komeda_kms_cleanup_private_objs(kms);
>  free_kms:
> @@ -223,9 +225,9 @@ 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);
>  	component_unbind_all(mdev->dev, drm);
>  	komeda_kms_cleanup_private_objs(kms);
>  	drm_mode_config_cleanup(drm);
> -- 
> 2.21.0
> 

-- 
====================
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| fix the world,  |
| but they're not |
| giving me the   |
 \ source code!  /
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