* [PATCH v2 1/2] drm/msm/dp: return fail when both link lane and rate are 0 at dpcd read
2021-01-13 18:59 [PATCH v2 0/2] fix missing unplug interrupt problem Kuogee Hsieh
@ 2021-01-13 18:59 ` Kuogee Hsieh
2021-01-13 19:00 ` [PATCH v2 2/2] drm/msm/dp: unplug interrupt missed after irq_hpd handler Kuogee Hsieh
2021-01-13 20:25 ` [PATCH v2 0/2] fix missing unplug interrupt problem Stephen Boyd
2 siblings, 0 replies; 6+ messages in thread
From: Kuogee Hsieh @ 2021-01-13 18:59 UTC (permalink / raw)
To: dri-devel, robdclark, sean, swboyd
Cc: Kuogee Hsieh, tanmay, abhinavk, aravindh, airlied, daniel,
linux-arm-msm, freedreno, linux-kernel
Some dongle set both link lane and rate to 0 during dpcd receiver
capability read if there is no monitor attache to this dongle.
Therefore return fail to prevent driver from trying to populate
monitor further.
Changes in V2:
-- split this patch into two. Move postpone irq_handle into next patch
-- add Fixes tag
Fixes: 78f94fbb6122 ("drm/msm/dp: fix connect/disconnect handled at irq_hpd")
Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>
---
drivers/gpu/drm/msm/dp/dp_panel.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/msm/dp/dp_panel.c b/drivers/gpu/drm/msm/dp/dp_panel.c
index 97dca3e..d1780bc 100644
--- a/drivers/gpu/drm/msm/dp/dp_panel.c
+++ b/drivers/gpu/drm/msm/dp/dp_panel.c
@@ -167,12 +167,18 @@ int dp_panel_read_sink_caps(struct dp_panel *dp_panel,
panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
rc = dp_panel_read_dpcd(dp_panel);
+ if (rc) {
+ DRM_ERROR("read dpcd failed %d\n", rc);
+ return rc;
+ }
+
bw_code = drm_dp_link_rate_to_bw_code(dp_panel->link_info.rate);
- if (rc || !is_link_rate_valid(bw_code) ||
+ if (!is_link_rate_valid(bw_code) ||
!is_lane_count_valid(dp_panel->link_info.num_lanes) ||
(bw_code > dp_panel->max_bw_code)) {
- DRM_ERROR("read dpcd failed %d\n", rc);
- return rc;
+ DRM_ERROR("Illegal link rate=%d lane=%d\n", dp_panel->link_info.rate,
+ dp_panel->link_info.num_lanes);
+ return -EINVAL;
}
if (dp_panel->dfp_present) {
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
^ permalink raw reply [flat|nested] 6+ messages in thread* [PATCH v2 2/2] drm/msm/dp: unplug interrupt missed after irq_hpd handler
2021-01-13 18:59 [PATCH v2 0/2] fix missing unplug interrupt problem Kuogee Hsieh
2021-01-13 18:59 ` [PATCH v2 1/2] drm/msm/dp: return fail when both link lane and rate are 0 at dpcd read Kuogee Hsieh
@ 2021-01-13 19:00 ` Kuogee Hsieh
2021-01-13 20:25 ` [PATCH v2 0/2] fix missing unplug interrupt problem Stephen Boyd
2 siblings, 0 replies; 6+ messages in thread
From: Kuogee Hsieh @ 2021-01-13 19:00 UTC (permalink / raw)
To: dri-devel, robdclark, sean, swboyd
Cc: Kuogee Hsieh, tanmay, abhinavk, aravindh, airlied, daniel,
linux-arm-msm, freedreno, linux-kernel
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>
---
drivers/gpu/drm/msm/dp/dp_aux.c | 7 -------
drivers/gpu/drm/msm/dp/dp_catalog.c | 24 ++++++++++++++++++++++++
drivers/gpu/drm/msm/dp/dp_ctrl.c | 15 ++++++++++-----
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 19b35ae..1c6e1d2 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 44f0c57..b1a9b1b 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 e3462f5..5ac155d 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 6e971d5..3bc7ed2 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -693,6 +693,13 @@ 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;
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
^ permalink raw reply [flat|nested] 6+ messages in thread