linux-kernel - Re: [PATCH v3 3/3] drm/msm/dp: replace DRM_DEBUG_DP marco with drm_dbg

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Message-ID: <f480811d-3e82-a6c7-1e57-fabe51604f9b@quicinc.com>
Date:   Wed, 16 Feb 2022 16:22:21 -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>,
        <dri-devel@...ts.freedesktop.org>, <robdclark@...il.com>,
        <sean@...rly.run>, <vkoul@...nel.org>
CC:     <quic_abhinavk@...cinc.com>, <quic_aravindh@...cinc.com>,
        <quic_sbillaka@...cinc.com>, <freedreno@...ts.freedesktop.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 3/3] drm/msm/dp: replace DRM_DEBUG_DP marco with
 drm_dbg_dp


On 2/16/2022 3:46 PM, Stephen Boyd wrote:
> Quoting Kuogee Hsieh (2022-02-02 10:56:39)
>
> Please add some commit text
>
>> Signed-off-by: Kuogee Hsieh <quic_khsieh@...cinc.com>
>> ---
>>   drivers/gpu/drm/msm/dp/dp_audio.c   |  49 +++++++++++------
>>   drivers/gpu/drm/msm/dp/dp_catalog.c |  34 +++++++-----
>>   drivers/gpu/drm/msm/dp/dp_ctrl.c    | 106 +++++++++++++++++++-----------------
>>   drivers/gpu/drm/msm/dp/dp_display.c |  68 +++++++++++++----------
>>   drivers/gpu/drm/msm/dp/dp_drm.c     |   4 +-
>>   drivers/gpu/drm/msm/dp/dp_link.c    |  99 +++++++++++++++++++--------------
>>   drivers/gpu/drm/msm/dp/dp_panel.c   |  43 +++++++++------
>>   drivers/gpu/drm/msm/dp/dp_parser.c  |   2 +-
>>   drivers/gpu/drm/msm/dp/dp_power.c   |  20 ++++---
>>   9 files changed, 246 insertions(+), 179 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/msm/dp/dp_audio.c b/drivers/gpu/drm/msm/dp/dp_audio.c
>> index d7e4a39..4fbbe0a 100644
>> --- a/drivers/gpu/drm/msm/dp/dp_audio.c
>> +++ b/drivers/gpu/drm/msm/dp/dp_audio.c
>> @@ -136,7 +136,8 @@ static void dp_audio_stream_sdp(struct dp_audio_private *audio)
>>          parity_byte = dp_audio_calculate_parity(new_value);
>>          value |= ((new_value << HEADER_BYTE_1_BIT)
>>                          | (parity_byte << PARITY_BYTE_1_BIT));
>> -       DRM_DEBUG_DP("Header Byte 1: value = 0x%x, parity_byte = 0x%x\n",
>> +       drm_dbg_dp((struct drm_device *)NULL,
> Why can't we pass the platform device pointer? Surely the cast is not
> necessary and in fact harmful.

Platform device only available at top level (dp_display.c), other level 
has no access to platform device or drm_device.

I will just apss NULL, such as  drm_dbg_dp(NULL, ...), if not device 
available.