[Intel-gfx] [PATCH 1/3] drm/dp: Print the number of bytes processed for aux nacks

[Jani Nikula]

On Thu, 19 Mar 2015, ville.syrjala at linux.intel.com wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
>
> When doing a native or i2c aux write the sink will indicate the number
> of bytes written even if it the nacks the transfer. When we receive a
> nack we just return an error upwards, but it might still be interesting
> to see how many bytes made it before the nack. So include that information
> in the debug messages.
>
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> ---
>  drivers/gpu/drm/drm_dp_helper.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
> index d5368ea..d7c73bd 100644
> --- a/drivers/gpu/drm/drm_dp_helper.c
> +++ b/drivers/gpu/drm/drm_dp_helper.c
> @@ -462,7 +462,7 @@ static int drm_dp_i2c_do_msg(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
>  			break;
>  
>  		case DP_AUX_NATIVE_REPLY_NACK:
> -			DRM_DEBUG_KMS("native nack\n");
> +			DRM_DEBUG_KMS("native nack (%d)\n", ret);

I guess it would be useful to print the full length too, so you know if
it was a short write or not.

BR,
Jani.


>  			return -EREMOTEIO;
>  
>  		case DP_AUX_NATIVE_REPLY_DEFER:
> @@ -493,7 +493,7 @@ static int drm_dp_i2c_do_msg(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
>  			return ret;
>  
>  		case DP_AUX_I2C_REPLY_NACK:
> -			DRM_DEBUG_KMS("I2C nack\n");
> +			DRM_DEBUG_KMS("I2C nack (%d)\n", ret);
>  			aux->i2c_nack_count++;
>  			return -EREMOTEIO;
>  
> -- 
> 2.0.5
>
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-- 
Jani Nikula, Intel Open Source Technology Center