[Intel-gfx] [PATCH 3/7] drm/i915: Add debug message for FB plane[0].offset!=0 error

[Kahola, Mika]

On Wed, 2020-01-01 at 01:37 +0200, Imre Deak wrote:
> Print a debug message if the FB plane[0] offset is not 0 as expected,
> to
> help understainding an add FB IOCTL fail.
> 
> Cc: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Cc: Mika Kahola <mika.kahola at intel.com>
> Signed-off-by: Imre Deak <imre.deak at intel.com>

Reviewed-by: Mika Kahola <mika.kahola at intel.com>

> ---
>  drivers/gpu/drm/i915/display/intel_display.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c
> b/drivers/gpu/drm/i915/display/intel_display.c
> index bbc9cf288067..2c2450d3469b 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -16912,8 +16912,11 @@ static int intel_framebuffer_init(struct
> intel_framebuffer *intel_fb,
>  	}
>  
>  	/* FIXME need to adjust LINOFF/TILEOFF accordingly. */
> -	if (mode_cmd->offsets[0] != 0)
> +	if (mode_cmd->offsets[0] != 0) {
> +		DRM_DEBUG_KMS("plane 0 offset (0x%08x) must be 0\n",
> +			      mode_cmd->offsets[0]);
>  		goto err;
> +	}
>  
>  	drm_helper_mode_fill_fb_struct(&dev_priv->drm, fb, mode_cmd);
>