Re: [PATCH] drm/i915: Don't display nonsensical values in i915_ddb_info on gen < 9

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Wed, Dec 03, 2014 at 05:33:24PM +0000, Damien Lespiau wrote:
> When playing around with debugfs and a HSW machine I noticed that we
> were displaying some garbled value in i915_ddb_info. This debugfs file
> is only meaningful for gen9+, so don't display anything on earlier
> platforms.
> 
> Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
> ---
>  drivers/gpu/drm/i915/i915_debugfs.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> index 6c16939..d0e445e 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -2743,6 +2743,9 @@ static int i915_ddb_info(struct seq_file *m, void *unused)
>  	enum pipe pipe;
>  	int plane;
>  
> +	if (INTEL_INFO(dev)->gen < 9)
> +		return 0;

-ENODEV or somesuch? But I guess we're not too consistent how we deal
with such things, so seems OK as is too:

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

> +
>  	drm_modeset_lock_all(dev);
>  
>  	ddb = &dev_priv->wm.skl_hw.ddb;
> -- 
> 1.8.3.1
> 
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-- 
Ville Syrjälä
Intel OTC
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