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=i915
>
> 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@xxxxxxxxx>
> ---
> 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 = 0;
> +module_param_named(fail, i915_fail, int, 0400);
> +MODULE_PARM_DESC(fail,
> + "Allow a user to skip loading the i915 driver, "
> + "0=load i915 as usual [default], 1=don't load");
> +
> static int i915_modeset __read_mostly = -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, const struct pci_device_id *ent)
> struct intel_device_info *intel_info =
> (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 preliminary_hw_support\n");
> --
> 1.8.3.1
>
> _______________________________________________
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> Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx
--
Ville Syrjälä
Intel OTC
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