[Intel-gfx] [PATCH] drm/i915: don't try to load GuC fw on pre-gen9

[Daniel Vetter]

On Thu, Sep 10, 2015 at 02:55:00PM -0700, Jesse Barnes wrote:
> This avoids some bad register writes and generally feels more correct
> than unconditionally trying to redirect interrupts and such.
> 
> References: https://bugs.freedesktop.org/show_bug.cgi?id=91777
> Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org>

Queued for -next, thanks for the patch.
-Daniel

> ---
>  drivers/gpu/drm/i915/i915_gem.c | 29 ++++++++++++++++-------------
>  1 file changed, 16 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> index 41263cd..fc3a5fd 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -4691,19 +4691,22 @@ i915_gem_init_hw(struct drm_device *dev)
>  	}
>  
>  	/* We can't enable contexts until all firmware is loaded */
> -	ret = intel_guc_ucode_load(dev);
> -	if (ret) {
> -		/*
> -		 * If we got an error and GuC submission is enabled, map
> -		 * the error to -EIO so the GPU will be declared wedged.
> -		 * OTOH, if we didn't intend to use the GuC anyway, just
> -		 * discard the error and carry on.
> -		 */
> -		DRM_ERROR("Failed to initialize GuC, error %d%s\n", ret,
> -			i915.enable_guc_submission ? "" : " (ignored)");
> -		ret = i915.enable_guc_submission ? -EIO : 0;
> -		if (ret)
> -			goto out;
> +	if (HAS_GUC_UCODE(dev)) {
> +		ret = intel_guc_ucode_load(dev);
> +		if (ret) {
> +			/*
> +			 * If we got an error and GuC submission is enabled, map
> +			 * the error to -EIO so the GPU will be declared wedged.
> +			 * OTOH, if we didn't intend to use the GuC anyway, just
> +			 * discard the error and carry on.
> +			 */
> +			DRM_ERROR("Failed to initialize GuC, error %d%s\n", ret,
> +				  i915.enable_guc_submission ? "" :
> +				  " (ignored)");
> +			ret = i915.enable_guc_submission ? -EIO : 0;
> +			if (ret)
> +				goto out;
> +		}
>  	}
>  
>  	/* Now it is safe to go back round and do everything else: */
> -- 
> 1.9.1
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch