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

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Message-ID: <7155e3ab-daf1-4104-6712-1c4e3a328b56@quicinc.com>
Date:   Tue, 25 Jan 2022 10:26:07 -0800
From:   Kuogee Hsieh <quic_khsieh@...cinc.com>
To:     Stephen Boyd <swboyd@...omium.org>, <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


On 1/24/2022 5:50 PM, Stephen Boyd wrote:
> 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.
where it say "deprecated"?
>> +                       phy, phy->init_count, phy->power_count);
>>          return ret;
>>   }
>>