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

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Date:   Mon, 24 Jan 2022 17:50:06 -0800
From:   Stephen Boyd <swboyd@...omium.org>
To:     Kuogee Hsieh <quic_khsieh@...cinc.com>, agross@...nel.org,
        airlied@...ux.ie, bjorn.andersson@...aro.org, daniel@...ll.ch,
        dmitry.baryshkov@...aro.org, 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] drm/msm/dp: add connector type to enhance debug messages

Quoting Kuogee Hsieh (2022-01-24 14:44:52)
> 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
> add connector type into debug messages for this purpose.
>
> Signed-off-by: Kuogee Hsieh <quic_khsieh@...cinc.com>
> ---
>  drivers/gpu/drm/msm/dp/dp_ctrl.c    | 20 +++++------
>  drivers/gpu/drm/msm/dp/dp_display.c | 71 ++++++++++++++++++++++++++-----------
>  2 files changed, 60 insertions(+), 31 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c
> index 245e1b9..dcd0126 100644
> --- a/drivers/gpu/drm/msm/dp/dp_ctrl.c
> +++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c
> @@ -1396,6 +1396,8 @@ void dp_ctrl_phy_init(struct dp_ctrl *dp_ctrl)
>
>         dp_catalog_ctrl_phy_reset(ctrl->catalog);
>         phy_init(phy);
> +       DRM_DEBUG_DP("phy=%p init=%d power_on=%d\n",
> +                       phy, phy->init_count, phy->power_count);
>  }
>
>  void dp_ctrl_phy_exit(struct dp_ctrl *dp_ctrl)
> @@ -1410,6 +1412,8 @@ void dp_ctrl_phy_exit(struct dp_ctrl *dp_ctrl)
>
>         dp_catalog_ctrl_phy_reset(ctrl->catalog);
>         phy_exit(phy);
> +       DRM_DEBUG_DP("phy=%p init=%d power_on=%d\n",
> +                       phy, phy->init_count, phy->power_count);
>  }
>
>  static bool dp_ctrl_use_fixed_nvid(struct dp_ctrl_private *ctrl)
> @@ -1484,6 +1488,8 @@ static int dp_ctrl_deinitialize_mainlink(struct dp_ctrl_private *ctrl)
>         phy_exit(phy);
>         phy_init(phy);
>
> +       DRM_DEBUG_DP("phy=%p init=%d power_on=%d\n",
> +                       phy, phy->init_count, phy->power_count);
>         return 0;
>  }
>

These are entirely new messages. Adding messages isn't mentioned in the
commit text. Please either split this out or indicate in the commit text
what's going on here.

> @@ -1895,14 +1901,12 @@ int dp_ctrl_off_link_stream(struct dp_ctrl *dp_ctrl)
>
>         phy_power_off(phy);
>
> -       DRM_DEBUG_DP("After, phy=%x init_count=%d power_on=%d\n",
> -               (u32)(uintptr_t)phy, phy->init_count, phy->power_count);
> -
>         /* aux channel down, reinit phy */
>         phy_exit(phy);
>         phy_init(phy);
>
> -       DRM_DEBUG_DP("DP off link/stream done\n");
> +       DRM_DEBUG_DP("phy=%p init=%d power_on=%d\n",

The DRM_DEBUG_DP macro says it's deprecated now and we should use
drm_dbg_dp() instead. Can you use that macro instead? Then it looks like
drm->dev can actually be any old struct device, so I guess we're allowed
to pass in the particular instance of dp device this is for. Allowing us
to figure out which DP device is actually printing messages.

> +                       phy, phy->init_count, phy->power_count);
>         return ret;
>  }
>