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>
This commit is contained in:
Kuogee Hsieh 2021-01-13 11:00:00 -08:00 committed by Rob Clark
parent fe286893ed
commit 9fc418430c
4 changed files with 41 additions and 12 deletions

View file

@ -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;
}

View file

@ -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;

View file

@ -1296,6 +1296,7 @@ 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.
*/
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 */

View file

@ -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;