From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ville =?iso-8859-1?Q?Syrj=E4l=E4?= <ville.syrjala@linux.intel.com>
Subject: Re: [PATCH] drm/i915: Provide a parameter to disable
 loading
Date: Thu, 16 Jan 2014 19:07:09 +0200
Message-ID: <20140116170708.GN9454@intel.com>
References: <1389890006-11702-1-git-send-email-damien.lespiau@intel.com>
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To: Damien Lespiau <damien.lespiau@intel.com>
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On Thu, Jan 16, 2014 at 04:33:26PM +0000, Damien Lespiau wrote:
> It can be handy at times to forbid i915 from loading at startup to
> modprobe it later.

modprobe.blacklist=3Di915

> =

> In particular, when trying to debug a problem that occurs at startup,
> it's usually easier to boot into a working machine and modprobe the
> driver at a more convenient time.
> =

> Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
> ---
>  drivers/gpu/drm/i915/i915_drv.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> =

> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_=
drv.c
> index 61fb9fc..d80e47e 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -38,6 +38,12 @@
>  #include <linux/module.h>
>  #include <drm/drm_crtc_helper.h>
>  =

> +static int i915_fail __read_mostly =3D 0;
> +module_param_named(fail, i915_fail, int, 0400);
> +MODULE_PARM_DESC(fail,
> +		"Allow a user to skip loading the i915 driver, "
> +		"0=3Dload i915 as usual [default], 1=3Ddon't load");
> +
>  static int i915_modeset __read_mostly =3D -1;
>  module_param_named(modeset, i915_modeset, int, 0400);
>  MODULE_PARM_DESC(modeset,
> @@ -823,6 +829,11 @@ static int i915_pci_probe(struct pci_dev *pdev, cons=
t struct pci_device_id *ent)
>  	struct intel_device_info *intel_info =3D
>  		(struct intel_device_info *) ent->driver_data;
>  =

> +	if (i915_fail) {
> +		DRM_INFO("i915 disabled by module parameter\n");
> +		return -ENODEV;
> +	}
> +
>  	if (IS_PRELIMINARY_HW(intel_info) && !i915_preliminary_hw_support) {
>  		DRM_INFO("This hardware requires preliminary hardware support.\n"
>  			 "See CONFIG_DRM_I915_PRELIMINARY_HW_SUPPORT, and/or modparam prelimi=
nary_hw_support\n");
> -- =

> 1.8.3.1
> =

> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- =

Ville Syrj=E4l=E4
Intel OTC