Some usb type-c dongle use irq_hpd request to perform device connection and disconnection. This patch add handling of both connection and disconnection are based on the state of hpd_state and sink_count.

Changes in V2: -- add dp_display_handle_port_ststus_changed() -- fix kernel test robot complaint

Changes in V3: -- add encoder_mode_set into struct dp_display_private

Reported-by: kernel test robot lkp@intel.com Fixes: 26b8d66a399e ("drm/msm/dp: promote irq_hpd handle to handle link training correctly") Tested-by: Stephen Boyd swboyd@chromium.org Signed-off-by: Kuogee Hsieh khsieh@codeaurora.org --- drivers/gpu/drm/msm/dp/dp_display.c | 92 ++++++++++++++++++++++--------------- 1 file changed, 55 insertions(+), 37 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c index e9cb878..6e971d5 100644 --- a/drivers/gpu/drm/msm/dp/dp_display.c +++ b/drivers/gpu/drm/msm/dp/dp_display.c @@ -102,6 +102,8 @@ struct dp_display_private { struct dp_display_mode dp_mode; struct msm_dp dp_display;

+ bool encoder_mode_set; + /* wait for audio signaling */ struct completion audio_comp;

@@ -279,13 +281,24 @@ 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) + +static void dp_display_set_encoder_mode(struct dp_display_private *dp) { - static bool encoder_mode_set; struct msm_drm_private *priv = dp->dp_display.drm_dev->dev_private; struct msm_kms *kms = priv->kms;

+ if (!dp->encoder_mode_set && dp->dp_display.encoder && + kms->funcs->set_encoder_mode) { + kms->funcs->set_encoder_mode(kms, + dp->dp_display.encoder, false); + + dp->encoder_mode_set = true; + } +} + +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)) { DRM_DEBUG_DP("HPD already %s\n", (hpd ? "on" : "off")); @@ -298,15 +311,6 @@ static int dp_display_send_hpd_notification(struct dp_display_private *dp,

dp->dp_display.is_connected = hpd;

- if (dp->dp_display.is_connected && dp->dp_display.encoder - && !encoder_mode_set - && kms->funcs->set_encoder_mode) { - kms->funcs->set_encoder_mode(kms, - dp->dp_display.encoder, false); - DRM_DEBUG_DP("set_encoder_mode() Completed\n"); - encoder_mode_set = true; - } - dp_display_send_hpd_event(&dp->dp_display);

return 0; @@ -342,7 +346,6 @@ static int dp_display_process_hpd_high(struct dp_display_private *dp)

dp_add_event(dp, EV_USER_NOTIFICATION, true, 0);

- end: return rc; } @@ -359,6 +362,8 @@ static void dp_display_host_init(struct dp_display_private *dp) if (dp->usbpd->orientation == ORIENTATION_CC2) flip = true;

+ dp_display_set_encoder_mode(dp); + dp_power_init(dp->power, flip); dp_ctrl_host_init(dp->ctrl, flip); dp_aux_init(dp->aux); @@ -442,24 +447,42 @@ static void dp_display_handle_video_request(struct dp_display_private *dp) } }

-static int dp_display_handle_irq_hpd(struct dp_display_private *dp) +static int dp_display_handle_port_ststus_changed(struct dp_display_private *dp) { - u32 sink_request; - - sink_request = dp->link->sink_request; + int rc = 0;

- if (sink_request & DS_PORT_STATUS_CHANGED) { - if (dp_display_is_sink_count_zero(dp)) { - DRM_DEBUG_DP("sink count is zero, nothing to do\n"); - return -ENOTCONN; + if (dp_display_is_sink_count_zero(dp)) { + DRM_DEBUG_DP("sink count is zero, nothing to do\n"); + if (dp->hpd_state != ST_DISCONNECTED) { + dp->hpd_state = ST_DISCONNECT_PENDING; + dp_add_event(dp, EV_USER_NOTIFICATION, false, 0); + } + } else { + if (dp->hpd_state == ST_DISCONNECTED) { + dp->hpd_state = ST_CONNECT_PENDING; + rc = dp_display_process_hpd_high(dp); + if (rc) + dp->hpd_state = ST_DISCONNECTED; } + } + + return rc; +} + +static int dp_display_handle_irq_hpd(struct dp_display_private *dp) +{ + u32 sink_request = dp->link->sink_request;

- return dp_display_process_hpd_high(dp); + if (dp->hpd_state == ST_DISCONNECTED) { + if (sink_request & DP_LINK_STATUS_UPDATED) { + DRM_ERROR("Disconnected, no DP_LINK_STATUS_UPDATED\n"); + return -EINVAL; + } }

dp_ctrl_handle_sink_request(dp->ctrl);

- if (dp->link->sink_request & DP_TEST_LINK_VIDEO_PATTERN) + if (sink_request & DP_TEST_LINK_VIDEO_PATTERN) dp_display_handle_video_request(dp);

return 0; @@ -490,19 +513,10 @@ static int dp_display_usbpd_attention_cb(struct device *dev) rc = dp_link_process_request(dp->link); if (!rc) { sink_request = dp->link->sink_request; - if (sink_request & DS_PORT_STATUS_CHANGED) { - /* same as unplugged */ - hpd->hpd_high = 0; - dp->hpd_state = ST_DISCONNECT_PENDING; - dp_add_event(dp, EV_USER_NOTIFICATION, false, 0); - } - - rc = dp_display_handle_irq_hpd(dp); - - if (!rc && (sink_request & DS_PORT_STATUS_CHANGED)) { - hpd->hpd_high = 1; - dp->hpd_state = ST_CONNECT_PENDING; - } + if (sink_request & DS_PORT_STATUS_CHANGED) + rc = dp_display_handle_port_ststus_changed(dp); + else + rc = dp_display_handle_irq_hpd(dp); }

return rc; @@ -668,6 +682,7 @@ static int dp_disconnect_pending_timeout(struct dp_display_private *dp, u32 data static int dp_irq_hpd_handle(struct dp_display_private *dp, u32 data) { u32 state; + int ret;

mutex_lock(&dp->event_mutex);

@@ -678,7 +693,10 @@ static int dp_irq_hpd_handle(struct dp_display_private *dp, u32 data) return 0; }

- dp_display_usbpd_attention_cb(&dp->pdev->dev); + ret = dp_display_usbpd_attention_cb(&dp->pdev->dev); + if (ret == -ECONNRESET) { /* cable unplugged */ + dp->core_initialized = false; + }

mutex_unlock(&dp->event_mutex);