linux-kernel - Re: [PATCH v2] drm/msm/dp: add connector type to enhance debug messages

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Message-ID: <CAE-0n538cYD-F_FDib=RN_vdDy71HkY-ybQhMzK_BNoEQtpnmw@mail.gmail.com>
Date:   Thu, 3 Feb 2022 21:06:42 +0000
From:   Stephen Boyd <swboyd@...omium.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Kuogee Hsieh <quic_khsieh@...cinc.com>, agross@...nel.org,
        airlied@...ux.ie, bjorn.andersson@...aro.org, daniel@...ll.ch,
        robdclark@...il.com, sean@...rly.run, vkoul@...nel.org
Cc:     quic_abhinavk@...cinc.com, aravindh@...eaurora.org,
        freedreno@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] drm/msm/dp: add connector type to enhance debug messages

Quoting Dmitry Baryshkov (2022-01-31 18:34:47)
> On 27/01/2022 02:46, Kuogee Hsieh wrote:
> > DP driver is a generic driver which supports both eDP and DP.
> > For debugging purpose it is required to have capabilities to
> > differentiate message are generated from eDP or DP.
> > This patch do:
> > 1) add connector type into debug messages within dp_display.c
> > 2) revise debug messages related to DP phy within dp_ctrl.c
> > 3) replace DRM_DEBUG_DP marco with drm_dbg_dp
>
> You list three items here. This patch should be split into respective
> three parts.
>
> >
> > Changes in V2:
> > -- replace DRM_DEBUG_DP marco with drm_dbg_dp
>
> I suppose that Stephen's idea was to pass proper drm_device to this
> function rather than always passing NULL.
>

The idea was to pass 'struct something' and then have a 'dev' named
member inside that's a struct device.

	struct something {
		struct device *dev;
		...
	};

Then the macro will extract the device out of it and use it to print
messages. It may be an abuse of the macro though because initially I
thought it needed to be a drm device but that doesn't seem to be the
case?