[PATCH 1/1] UBUNTU: (pre-stable) drm/i915: Increase fb alignment to 64k

[Stefan Bader]

Well, something aligned to 64k is always aligned to 4k so, things should not be
able to get worse...

Andy Whitcroft wrote:
> From: Chris Wilson <chris at chris-wilson.co.uk>
> 
> BugLink: http://bugs.launchpad.net/bugs/404064
> 
> An untiled framebuffer must be aligned to 64k. This is normally handled
> by intel_pin_and_fence_fb_obj(), but the intelfb_create() likes to be
> different and do the pinning itself. However, it aligns the buffer
> object incorrectly for pre-i965 chipsets causing a PGTBL_ERR when it is
> installed onto the output.
> 
> Fixes:
>   KMS error message while initializing modesetting -
>   render error detected: EIR: 0x10 [i915]
>   http://bugs.freedesktop.org/show_bug.cgi?id=22936
> 
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: stable at kernel.org
> Signed-off-by: Andy Whitcroft <apw at canonical.com>
Acked-by: Stefan Bader <stefan.bader at canonical.com>
> ---
>  drivers/gpu/drm/i915/intel_fb.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_fb.c b/drivers/gpu/drm/i915/intel_fb.c
> index 2b0fe54..1318ac2 100644
> --- a/drivers/gpu/drm/i915/intel_fb.c
> +++ b/drivers/gpu/drm/i915/intel_fb.c
> @@ -148,7 +148,7 @@ static int intelfb_create(struct drm_device *dev, uint32_t fb_width,
>  
>  	mutex_lock(&dev->struct_mutex);
>  
> -	ret = i915_gem_object_pin(fbo, PAGE_SIZE);
> +	ret = i915_gem_object_pin(fbo, 64*1024);
>  	if (ret) {
>  		DRM_ERROR("failed to pin fb: %d\n", ret);
>  		goto out_unref;