Re: [PATCH 3/4] drm/i915: debug log for REPLY_ACK missing

From: Sean Paul <sean@poorly.run>
To: Ramalingam C <ramalingam.c@intel.com>
Cc: daniel.vetter@ffwll.ch, intel-gfx@lists.freedesktop.org,
	seanpaul@chromium.org, dri-devel@lists.freedesktop.org
Subject: Re: [PATCH 3/4] drm/i915: debug log for REPLY_ACK missing
Date: Mon, 3 Dec 2018 09:26:26 -0500	[thread overview]
Message-ID: <20181203142626.GO154160@art_vandelay> (raw)
In-Reply-To: <1543327379-22629-4-git-send-email-ramalingam.c@intel.com>

On Tue, Nov 27, 2018 at 07:32:58PM +0530, Ramalingam C wrote:
> Adding a debug log when the DP_AUX_NATIVE_REPLY_ACK is missing
> for aksv write. This helps to locate the possible non responding
> DP HDCP sinks.
> 
> Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_dp.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 70ae3d57316b..18e3a5a3d873 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -5390,7 +5390,11 @@ int intel_dp_hdcp_write_an_aksv(struct intel_digital_port *intel_dig_port,
>  	}
>  
>  	reply = (rxbuf[0] >> 4) & DP_AUX_NATIVE_REPLY_MASK;
> -	return reply == DP_AUX_NATIVE_REPLY_ACK ? 0 : -EIO;
> +	ret = reply == DP_AUX_NATIVE_REPLY_ACK ? 0 : -EIO;
> +	if (ret)
> +		DRM_DEBUG_KMS("Aksv write: DP_AUX_NATIVE_REPLY_ACK missing\n");

This is pretty hard to read. Could you please change to:

        if (reply != DP_AUX_NATIVE_REPLY_ACK) {
                DRM_DEBUG_KMS("Aksv write: no DP_AUX_NATIVE_REPLY_ACK %x\n",
                              reply);
                return -EIO
        }
        return 0;

With this change,

Reviewed-by: Sean Paul <sean@poorly.run>

> +
> +	return ret;
>  }
>  
>  static int intel_dp_hdcp_read_bksv(struct intel_digital_port *intel_dig_port,
> -- 
> 2.7.4
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Sean Paul, Software Engineer, Google / Chromium OS
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