[Intel-gfx] [PATCH v2] drm/i915: Enable GSE interrupt on BDW+

[Jani Nikula]

On Thu, 19 May 2016, ville.syrjala at linux.intel.com wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
>
> We've never actually enabled or unmasked the GSE interrupt on BDW+,
> even though the interrupt handler was always prepared for it.
> Let's enable it and see what happens.
>
> Credit to Mark Kettenis who fixed this in the OpenBSD fork of the
> driver. He reports that it fixed the "ACPI _BCM/_BCQ-based
> brightness mechanism on a MacBookPro12,1 and a 3rd gen Lenovo X1
> Carbon" for them.
>
> Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>
> References: http://lists.freedesktop.org/archives/intel-gfx/2015-December/081799.html
> Reported-by: Mark Kettenis <mark.kettenis at xs4all.nl>
> Cc: Mark Kettenis <mark.kettenis at xs4all.nl>
> Cc: Jani Nikula <jani.nikula at linux.intel.com>
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> ---
> Nothing changed, just reposted for CI.

As I noted previously, I don't think we need this, but if you insist on
having it, please add a note about it in the commit message. With that,

Acked-by: Jani Nikula <jani.nikula at intel.com>

>
>  drivers/gpu/drm/i915/i915_irq.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index f0d941455bed..4c271ea267bb 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -3799,6 +3799,7 @@ static void gen8_de_irq_postinstall(struct drm_i915_private *dev_priv)
>  	uint32_t de_pipe_enables;
>  	u32 de_port_masked = GEN8_AUX_CHANNEL_A;
>  	u32 de_port_enables;
> +	u32 de_misc_masked = GEN8_DE_MISC_GSE;
>  	enum pipe pipe;
>  
>  	if (INTEL_INFO(dev_priv)->gen >= 9) {
> @@ -3834,6 +3835,7 @@ static void gen8_de_irq_postinstall(struct drm_i915_private *dev_priv)
>  					  de_pipe_enables);
>  
>  	GEN5_IRQ_INIT(GEN8_DE_PORT_, ~de_port_masked, de_port_enables);
> +	GEN5_IRQ_INIT(GEN8_DE_MISC_, ~de_misc_masked, de_misc_masked);
>  }
>  
>  static int gen8_irq_postinstall(struct drm_device *dev)

-- 
Jani Nikula, Intel Open Source Technology Center