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author | Kuogee Hsieh <khsieh@codeaurora.org> | 2021-01-13 11:00:00 -0800 |
---|---|---|
committer | Rob Clark <robdclark@chromium.org> | 2021-01-31 11:34:36 -0800 |
commit | 9fc418430c6584827b188855e698c599a7ddc0f1 (patch) | |
tree | ab0405434f2276bd15c4d37f311f1da9246ea1f3 /drivers/gpu | |
parent | fe286893ed34b12684659d3efb907d47fe18559b (diff) | |
download | linux-stable-9fc418430c6584827b188855e698c599a7ddc0f1.tar.gz linux-stable-9fc418430c6584827b188855e698c599a7ddc0f1.tar.bz2 linux-stable-9fc418430c6584827b188855e698c599a7ddc0f1.zip |
drm/msm/dp: unplug interrupt missed after irq_hpd handler
There is HPD unplug interrupts missed at scenario of an irq_hpd
followed by unplug interrupts with around 10 ms in between.
Since both AUX_SW_RESET and DP_SW_RESET clear pending HPD interrupts,
irq_hpd handler should not issues either aux or sw reset to avoid
following unplug interrupt be cleared accidentally. This patch
also postpone handling of irq_hpd until connected state if it
happened at connection pending state.
Changes in V2:
-- add postpone handling of irq_hpd until connected state
-- check DP_TRAINING_1 instead of DP_TRAINING_NONE
Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>
Diffstat (limited to 'drivers/gpu')
-rw-r--r-- | drivers/gpu/drm/msm/dp/dp_aux.c | 7 | ||||
-rw-r--r-- | drivers/gpu/drm/msm/dp/dp_catalog.c | 24 | ||||
-rw-r--r-- | drivers/gpu/drm/msm/dp/dp_ctrl.c | 15 | ||||
-rw-r--r-- | drivers/gpu/drm/msm/dp/dp_display.c | 7 |
4 files changed, 41 insertions, 12 deletions
diff --git a/drivers/gpu/drm/msm/dp/dp_aux.c b/drivers/gpu/drm/msm/dp/dp_aux.c index 19b35ae3e927..1c6e1d2b947c 100644 --- a/drivers/gpu/drm/msm/dp/dp_aux.c +++ b/drivers/gpu/drm/msm/dp/dp_aux.c @@ -336,7 +336,6 @@ static ssize_t dp_aux_transfer(struct drm_dp_aux *dp_aux, ssize_t ret; int const aux_cmd_native_max = 16; int const aux_cmd_i2c_max = 128; - int const retry_count = 5; struct dp_aux_private *aux = container_of(dp_aux, struct dp_aux_private, dp_aux); @@ -378,12 +377,6 @@ static ssize_t dp_aux_transfer(struct drm_dp_aux *dp_aux, ret = dp_aux_cmd_fifo_tx(aux, msg); if (ret < 0) { - if (aux->native) { - aux->retry_cnt++; - if (!(aux->retry_cnt % retry_count)) - dp_catalog_aux_update_cfg(aux->catalog); - dp_catalog_aux_reset(aux->catalog); - } usleep_range(400, 500); /* at least 400us to next try */ goto unlock_exit; } diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.c b/drivers/gpu/drm/msm/dp/dp_catalog.c index 44f0c57798d0..b1a9b1b98f5f 100644 --- a/drivers/gpu/drm/msm/dp/dp_catalog.c +++ b/drivers/gpu/drm/msm/dp/dp_catalog.c @@ -190,6 +190,18 @@ int dp_catalog_aux_clear_hw_interrupts(struct dp_catalog *dp_catalog) return 0; } +/** + * dp_catalog_aux_reset() - reset AUX controller + * + * @aux: DP catalog structure + * + * return: void + * + * This function reset AUX controller + * + * NOTE: reset AUX controller will also clear any pending HPD related interrupts + * + */ void dp_catalog_aux_reset(struct dp_catalog *dp_catalog) { u32 aux_ctrl; @@ -483,6 +495,18 @@ int dp_catalog_ctrl_set_pattern(struct dp_catalog *dp_catalog, return 0; } +/** + * dp_catalog_ctrl_reset() - reset DP controller + * + * @dp_catalog: DP catalog structure + * + * return: void + * + * This function reset the DP controller + * + * NOTE: reset DP controller will also clear any pending HPD related interrupts + * + */ void dp_catalog_ctrl_reset(struct dp_catalog *dp_catalog) { u32 sw_reset; diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c index e3462f5d96d7..5ac155d6b85f 100644 --- a/drivers/gpu/drm/msm/dp/dp_ctrl.c +++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c @@ -1296,7 +1296,8 @@ static int dp_ctrl_setup_main_link(struct dp_ctrl_private *ctrl, * transitioned to PUSH_IDLE. In order to start transmitting * a link training pattern, we have to first do soft reset. */ - dp_catalog_ctrl_reset(ctrl->catalog); + if (*training_step == DP_TRAINING_1) + dp_catalog_ctrl_reset(ctrl->catalog); ret = dp_ctrl_link_train(ctrl, cr, training_step); @@ -1491,15 +1492,18 @@ static int dp_ctrl_deinitialize_mainlink(struct dp_ctrl_private *ctrl) return 0; } +static void dp_ctrl_link_idle_reset(struct dp_ctrl_private *ctrl) +{ + dp_ctrl_push_idle(&ctrl->dp_ctrl); + dp_catalog_ctrl_reset(ctrl->catalog); +} + static int dp_ctrl_link_maintenance(struct dp_ctrl_private *ctrl) { int ret = 0; struct dp_cr_status cr; int training_step = DP_TRAINING_NONE; - dp_ctrl_push_idle(&ctrl->dp_ctrl); - dp_catalog_ctrl_reset(ctrl->catalog); - ctrl->dp_ctrl.pixel_rate = ctrl->panel->dp_mode.drm_mode.clock; ret = dp_ctrl_setup_main_link(ctrl, &cr, &training_step); @@ -1626,6 +1630,7 @@ void dp_ctrl_handle_sink_request(struct dp_ctrl *dp_ctrl) if (sink_request & DP_TEST_LINK_TRAINING) { dp_link_send_test_response(ctrl->link); + dp_ctrl_link_idle_reset(ctrl); if (dp_ctrl_link_maintenance(ctrl)) { DRM_ERROR("LM failed: TEST_LINK_TRAINING\n"); return; @@ -1679,7 +1684,7 @@ int dp_ctrl_on_link(struct dp_ctrl *dp_ctrl) break; } - training_step = DP_TRAINING_NONE; + training_step = DP_TRAINING_1; rc = dp_ctrl_setup_main_link(ctrl, &cr, &training_step); if (rc == 0) { /* training completed successfully */ diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c index 3bc7ed21de28..3a7e6c5adbf5 100644 --- a/drivers/gpu/drm/msm/dp/dp_display.c +++ b/drivers/gpu/drm/msm/dp/dp_display.c @@ -700,6 +700,13 @@ static int dp_irq_hpd_handle(struct dp_display_private *dp, u32 data) return 0; } + if (state == ST_CONNECT_PENDING) { + /* wait until ST_CONNECTED */ + dp_add_event(dp, EV_IRQ_HPD_INT, 0, 1); /* delay = 1 */ + mutex_unlock(&dp->event_mutex); + return 0; + } + ret = dp_display_usbpd_attention_cb(&dp->pdev->dev); if (ret == -ECONNRESET) { /* cable unplugged */ dp->core_initialized = false; |