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Message-ID: <c1b816bc-4fee-338b-d066-6e6c528b5e3c@quicinc.com>
Date: Mon, 18 Sep 2023 10:09:03 -0700
From: Kuogee Hsieh <quic_khsieh@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
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 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.
>
>> 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
>>
>
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