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

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Message-ID: <CAA8EJpp-DB9+zWZnszkyxNGd+kO5Bko+mw7T_KoeFVTQPmxvDw@mail.gmail.com>
Date:   Wed, 26 Jan 2022 13:58:56 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Kuogee Hsieh <quic_khsieh@...cinc.com>
Cc:     Stephen Boyd <swboyd@...omium.org>, agross@...nel.org,
        airlied@...ux.ie, bjorn.andersson@...aro.org, daniel@...ll.ch,
        robdclark@...il.com, sean@...rly.run, vkoul@...nel.org,
        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 Tue, 25 Jan 2022 at 21:26, Kuogee Hsieh <quic_khsieh@...cinc.com> wrote:
>
>
> 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"?

Quoting drm_print.h:

/* NOTE: this is deprecated in favor of drm_dbg_dp(NULL, ...). */
#define DRM_DEBUG_DP(fmt, ...)                                          \
        __drm_dbg(DRM_UT_DP, fmt, ## __VA_ARGS__)


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



-- 
With best wishes
Dmitry