[Intel-gfx] [PATCH] drm/i915: Show the DPCD read error inline

[Jani Nikula]

On Wed, 10 Oct 2018, Chris Wilson <chris at chris-wilson.co.uk> wrote:
> When reporting the DPCD dump through debugfs, show the errors inline
> where appropriate. If a read at one particular offset fails, report it
>
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=106371
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

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

This'll be phased out anyway in favor of using the DP aux device node.

> ---
>  drivers/gpu/drm/i915/i915_debugfs.c | 11 ++++-------
>  1 file changed, 4 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> index 4565eda29c87..00c551d3e409 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -4915,13 +4915,10 @@ static int i915_dpcd_show(struct seq_file *m, void *data)
>  			continue;
>  
>  		err = drm_dp_dpcd_read(&intel_dp->aux, b->offset, buf, size);
> -		if (err <= 0) {
> -			DRM_ERROR("dpcd read (%zu bytes at %u) failed (%zd)\n",
> -				  size, b->offset, err);
> -			continue;
> -		}
> -
> -		seq_printf(m, "%04x: %*ph\n", b->offset, (int) size, buf);
> +		if (err < 0)
> +			seq_printf(m, "%04x: ERROR %d\n", b->offset, (int)err);
> +		else
> +			seq_printf(m, "%04x: %*ph\n", b->offset, (int)err, buf);
>  	}
>  
>  	return 0;

-- 
Jani Nikula, Intel Open Source Graphics Center