[Intel-gfx] [PATCH v4 2/2] drm/i915/hdcp: Fix config_stream_type() ret value

[Ramalingam C]

On 2020-03-03 at 10:54:07 +0530, Anshuman Gupta wrote:
> DP shim's config_stream_type considered to be succeeded when
> return value of intel_dp_hdcp2_write_msg() equals to size of
> message to be written, it makes config_stream_type to return
> a zero success value in order to succeed the HDCP auth.
> 
> v2:
> - config_stream_type() returns 0 on success. [Ram]
> 
> CC: Ramalingam C <ramalingam.c at intel.com>
> Signed-off-by: Anshuman Gupta <anshuman.gupta at intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_dp.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> index 2db8d46f61a1..2259c2527457 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -6448,6 +6448,7 @@ static
>  int intel_dp_hdcp2_config_stream_type(struct intel_digital_port *intel_dig_port,
>  				      bool is_repeater, u8 content_type)
>  {
> +	int ret;
>  	struct hdcp2_dp_errata_stream_type stream_type_msg;
>  
>  	if (is_repeater)
> @@ -6463,8 +6464,13 @@ int intel_dp_hdcp2_config_stream_type(struct intel_digital_port *intel_dig_port,
>  	stream_type_msg.msg_id = HDCP_2_2_ERRATA_DP_STREAM_TYPE;
>  	stream_type_msg.stream_type = content_type;
>  
> -	return intel_dp_hdcp2_write_msg(intel_dig_port, &stream_type_msg,
> +	ret =  intel_dp_hdcp2_write_msg(intel_dig_port, &stream_type_msg,
>  					sizeof(stream_type_msg));
> +
> +	if (ret == sizeof(stream_type_msg))
return ret < 0 ? ret : 0;
Above statement will be sufficient here?

-Ram
> +		return 0;
> +	else
> +		return ret;
>  }
>  
>  static
> -- 
> 2.25.1
>