[Intel-gfx] [PATCH 14/15] drm/i915: check the power well on i915_pipe_enabled

[Ben Widawsky]

On Wed, Mar 06, 2013 at 08:03:21PM -0300, Paulo Zanoni wrote:
> From: Paulo Zanoni <paulo.r.zanoni at intel.com>
> 
> This fixes "unclaimed register" messages when the power well is
> disabled and there's a GPU hang.

This is really beginning to smell like we need special display register
reads which can do the check below.

> 
> Signed-off-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
Reviewed-by: Ben Widawsky <ben at bwidawsk.net>

> ---
>  drivers/gpu/drm/i915/i915_irq.c |    3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index 29b1bb1..aefc674 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -129,6 +129,9 @@ i915_pipe_enabled(struct drm_device *dev, int pipe)
>  	enum transcoder cpu_transcoder = intel_pipe_to_cpu_transcoder(dev_priv,
>  								      pipe);
>  
> +	if (intel_power_well_is_down(dev) && cpu_transcoder != TRANSCODER_EDP)
> +		return false;
> +
>  	return I915_READ(PIPECONF(cpu_transcoder)) & PIPECONF_ENABLE;
>  }
>  
> -- 
> 1.7.10.4
> 
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-- 
Ben Widawsky, Intel Open Source Technology Center