[PATCH 2/3] drm: Print bad user modes

[Harry Wentland]

On 2018-06-11 03:34 PM, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> Print out the modeline when we reject a bad user mode. Avoids having to
> guess why it was rejected.
> 
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

Reviewed-by: Harry Wentland <harry.wentland at amd.com>

Harry

> ---
>  drivers/gpu/drm/drm_atomic.c        | 20 +++++++++++++++++---
>  drivers/gpu/drm/drm_crtc.c          |  4 +++-
>  drivers/gpu/drm/drm_crtc_internal.h |  3 +++
>  drivers/gpu/drm/drm_modes.c         |  2 +-
>  4 files changed, 24 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
> index d7de83a6c1c2..5fe5e06062a9 100644
> --- a/drivers/gpu/drm/drm_atomic.c
> +++ b/drivers/gpu/drm/drm_atomic.c
> @@ -400,10 +400,24 @@ int drm_atomic_set_mode_prop_for_crtc(struct drm_crtc_state *state,
>  	memset(&state->mode, 0, sizeof(state->mode));
>  
>  	if (blob) {
> -		if (blob->length != sizeof(struct drm_mode_modeinfo) ||
> -		    drm_mode_convert_umode(state->crtc->dev, &state->mode,
> -					   blob->data))
> +		int ret;
> +
> +		if (blob->length != sizeof(struct drm_mode_modeinfo)) {
> +			DRM_DEBUG_ATOMIC("[CRTC:%d:%s] bad mode blob length: %zu\n",
> +					 crtc->base.id, crtc->name,
> +					 blob->length);
> +			return -EINVAL;
> +		}
> +
> +		ret = drm_mode_convert_umode(crtc->dev,
> +					     &state->mode, blob->data);
> +		if (ret) {
> +			DRM_DEBUG_ATOMIC("[CRTC:%d:%s] invalid mode (ret=%d, status=%s):\n",
> +					 crtc->base.id, crtc->name,
> +					 ret, drm_get_mode_status_name(state->mode.status));
> +			drm_mode_debug_printmodeline(&state->mode);
>  			return -EINVAL;
> +		}
>  
>  		state->mode_blob = drm_property_blob_get(blob);
>  		state->enable = true;
> diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
> index 53828fc8d911..163d82ac7d76 100644
> --- a/drivers/gpu/drm/drm_crtc.c
> +++ b/drivers/gpu/drm/drm_crtc.c
> @@ -649,7 +649,9 @@ int drm_mode_setcrtc(struct drm_device *dev, void *data,
>  
>  		ret = drm_mode_convert_umode(dev, mode, &crtc_req->mode);
>  		if (ret) {
> -			DRM_DEBUG_KMS("Invalid mode\n");
> +			DRM_DEBUG_KMS("Invalid mode (ret=%d, status=%s)\n",
> +				      ret, drm_get_mode_status_name(mode->status));
> +			drm_mode_debug_printmodeline(mode);
>  			goto out;
>  		}
>  
> diff --git a/drivers/gpu/drm/drm_crtc_internal.h b/drivers/gpu/drm/drm_crtc_internal.h
> index 5d307b23a4e6..34499800932a 100644
> --- a/drivers/gpu/drm/drm_crtc_internal.h
> +++ b/drivers/gpu/drm/drm_crtc_internal.h
> @@ -56,6 +56,9 @@ int drm_mode_setcrtc(struct drm_device *dev,
>  int drm_modeset_register_all(struct drm_device *dev);
>  void drm_modeset_unregister_all(struct drm_device *dev);
>  
> +/* drm_modes.c */
> +const char *drm_get_mode_status_name(enum drm_mode_status status);
> +
>  /* IOCTLs */
>  int drm_mode_getresources(struct drm_device *dev,
>  			  void *data, struct drm_file *file_priv);
> diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
> index c78ca0e84ffd..7f552d5fa88e 100644
> --- a/drivers/gpu/drm/drm_modes.c
> +++ b/drivers/gpu/drm/drm_modes.c
> @@ -1257,7 +1257,7 @@ static const char * const drm_mode_status_names[] = {
>  
>  #undef MODE_STATUS
>  
> -static const char *drm_get_mode_status_name(enum drm_mode_status status)
> +const char *drm_get_mode_status_name(enum drm_mode_status status)
>  {
>  	int index = status + 3;
>  
>