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Message-ID: <CAA8EJppEJ_0JwVqRv+ue9kJRZhOdxXVnHe5G_ey-8eKZ9H23TQ@mail.gmail.com>
Date: Tue, 19 Sep 2023 12:44:38 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Kuogee Hsieh <quic_khsieh@...cinc.com>
Cc: dri-devel@...ts.freedesktop.org, robdclark@...il.com,
sean@...rly.run, swboyd@...omium.org, dianders@...omium.org,
vkoul@...nel.org, daniel@...ll.ch, airlied@...il.com,
agross@...nel.org, andersson@...nel.org, quic_abhinavk@...cinc.com,
quic_jesszhan@...cinc.com, quic_sbillaka@...cinc.com,
marijn.suijten@...ainline.org, freedreno@...ts.freedesktop.org,
linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/7] drm/msm/dp: replace is_connected with link_ready
On Mon, 18 Sept 2023 at 20:09, Kuogee Hsieh <quic_khsieh@...cinc.com> wrote:
>
>
> On 9/15/2023 6:51 PM, Dmitry Baryshkov wrote:
> > On Sat, 16 Sept 2023 at 00:38, Kuogee Hsieh <quic_khsieh@...cinc.com> wrote:
> >> The is_connected flag is set to true after DP mainlink successfully
> >> finish link training. Replace the is_connected flag with link_ready
> > finishes.
> > Also this is not a replace, this patch renames the flag.
> yes, it is rename.
> >
> >> flag to avoid confusing.
> > confusing what with what?
>
> we have ST_MAINLINK_RAEDY state which means mainlink had finished link
> training and ready for video.
>
> Therefore I think link_ready is more meaningful than is_connected.
Guess, all this should have been in the commit message.
>
>
> >
> >> Signed-off-by: Kuogee Hsieh <quic_khsieh@...cinc.com>
> >> ---
> >> drivers/gpu/drm/msm/dp/dp_display.c | 19 +++++++++----------
> >> drivers/gpu/drm/msm/dp/dp_display.h | 2 +-
> >> drivers/gpu/drm/msm/dp/dp_drm.c | 14 +++++++-------
> >> 3 files changed, 17 insertions(+), 18 deletions(-)
> >>
> >> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> >> index c217430..18d16c7 100644
> >> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> >> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> >> @@ -367,12 +367,11 @@ static void dp_display_send_hpd_event(struct msm_dp *dp_display)
> >> drm_helper_hpd_irq_event(connector->dev);
> >> }
> >>
> >> -
> >> static int dp_display_send_hpd_notification(struct dp_display_private *dp,
> >> bool hpd)
> >> {
> >> - if ((hpd && dp->dp_display.is_connected) ||
> >> - (!hpd && !dp->dp_display.is_connected)) {
> >> + if ((hpd && dp->dp_display.link_ready) ||
> >> + (!hpd && !dp->dp_display.link_ready)) {
> >> drm_dbg_dp(dp->drm_dev, "HPD already %s\n",
> >> (hpd ? "on" : "off"));
> >> return 0;
> >> @@ -382,7 +381,7 @@ static int dp_display_send_hpd_notification(struct dp_display_private *dp,
> >> if (!hpd)
> >> dp->panel->video_test = false;
> >>
> >> - dp->dp_display.is_connected = hpd;
> >> + dp->dp_display.link_ready = hpd;
> >>
> >> drm_dbg_dp(dp->drm_dev, "type=%d hpd=%d\n",
> >> dp->dp_display.connector_type, hpd);
> >> @@ -922,7 +921,7 @@ int dp_display_set_plugged_cb(struct msm_dp *dp_display,
> >>
> >> dp_display->plugged_cb = fn;
> >> dp_display->codec_dev = codec_dev;
> >> - plugged = dp_display->is_connected;
> >> + plugged = dp_display->link_ready;
> >> dp_display_handle_plugged_change(dp_display, plugged);
> >>
> >> return 0;
> >> @@ -1352,16 +1351,16 @@ static int dp_pm_resume(struct device *dev)
> >> * also only signal audio when disconnected
> >> */
> >> if (dp->link->sink_count) {
> >> - dp->dp_display.is_connected = true;
> >> + dp->dp_display.link_ready = true;
> >> } else {
> >> - dp->dp_display.is_connected = false;
> >> + dp->dp_display.link_ready = false;
> >> dp_display_handle_plugged_change(dp_display, false);
> >> }
> >>
> >> drm_dbg_dp(dp->drm_dev,
> >> "After, type=%d sink=%d conn=%d core_init=%d phy_init=%d power=%d\n",
> >> dp->dp_display.connector_type, dp->link->sink_count,
> >> - dp->dp_display.is_connected, dp->core_initialized,
> >> + dp->dp_display.link_ready, dp->core_initialized,
> >> dp->phy_initialized, dp_display->power_on);
> >>
> >> mutex_unlock(&dp->event_mutex);
> >> @@ -1754,8 +1753,8 @@ void dp_bridge_hpd_notify(struct drm_bridge *bridge,
> >> return;
> >> }
> >>
> >> - if (!dp_display->is_connected && status == connector_status_connected)
> >> + if (!dp_display->link_ready && status == connector_status_connected)
> >> dp_add_event(dp, EV_HPD_PLUG_INT, 0, 0);
> >> - else if (dp_display->is_connected && status == connector_status_disconnected)
> >> + else if (dp_display->link_ready && status == connector_status_disconnected)
> >> dp_add_event(dp, EV_HPD_UNPLUG_INT, 0, 0);
> >> }
> >> diff --git a/drivers/gpu/drm/msm/dp/dp_display.h b/drivers/gpu/drm/msm/dp/dp_display.h
> >> index b3c08de..d65693e 100644
> >> --- a/drivers/gpu/drm/msm/dp/dp_display.h
> >> +++ b/drivers/gpu/drm/msm/dp/dp_display.h
> >> @@ -16,7 +16,7 @@ struct msm_dp {
> >> struct drm_bridge *bridge;
> >> struct drm_connector *connector;
> >> struct drm_bridge *next_bridge;
> >> - bool is_connected;
> >> + bool link_ready;
> >> bool audio_enabled;
> >> bool power_on;
> >> unsigned int connector_type;
> >> diff --git a/drivers/gpu/drm/msm/dp/dp_drm.c b/drivers/gpu/drm/msm/dp/dp_drm.c
> >> index 785d766..ee945ca 100644
> >> --- a/drivers/gpu/drm/msm/dp/dp_drm.c
> >> +++ b/drivers/gpu/drm/msm/dp/dp_drm.c
> >> @@ -24,10 +24,10 @@ static enum drm_connector_status dp_bridge_detect(struct drm_bridge *bridge)
> >>
> >> dp = to_dp_bridge(bridge)->dp_display;
> >>
> >> - drm_dbg_dp(dp->drm_dev, "is_connected = %s\n",
> >> - (dp->is_connected) ? "true" : "false");
> >> + drm_dbg_dp(dp->drm_dev, "link_ready = %s\n",
> >> + (dp->link_ready) ? "true" : "false");
> >>
> >> - return (dp->is_connected) ? connector_status_connected :
> >> + return (dp->link_ready) ? connector_status_connected :
> >> connector_status_disconnected;
> >> }
> >>
> >> @@ -40,8 +40,8 @@ static int dp_bridge_atomic_check(struct drm_bridge *bridge,
> >>
> >> dp = to_dp_bridge(bridge)->dp_display;
> >>
> >> - drm_dbg_dp(dp->drm_dev, "is_connected = %s\n",
> >> - (dp->is_connected) ? "true" : "false");
> >> + drm_dbg_dp(dp->drm_dev, "link_ready = %s\n",
> >> + (dp->link_ready) ? "true" : "false");
> >>
> >> /*
> >> * There is no protection in the DRM framework to check if the display
> >> @@ -55,7 +55,7 @@ static int dp_bridge_atomic_check(struct drm_bridge *bridge,
> >> * After that this piece of code can be removed.
> >> */
> >> if (bridge->ops & DRM_BRIDGE_OP_HPD)
> >> - return (dp->is_connected) ? 0 : -ENOTCONN;
> >> + return (dp->link_ready) ? 0 : -ENOTCONN;
> >>
> >> return 0;
> >> }
> >> @@ -78,7 +78,7 @@ static int dp_bridge_get_modes(struct drm_bridge *bridge, struct drm_connector *
> >> dp = to_dp_bridge(bridge)->dp_display;
> >>
> >> /* pluggable case assumes EDID is read when HPD */
> >> - if (dp->is_connected) {
> >> + if (dp->link_ready) {
> >> rc = dp_display_get_modes(dp);
> >> if (rc <= 0) {
> >> DRM_ERROR("failed to get DP sink modes, rc=%d\n", rc);
> >> --
> >> 2.7.4
> >>
> >
--
With best wishes
Dmitry
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