Hi Stephen,
Thanks for the review.
On 2021-06-17 15:33, Stephen Boyd wrote:
Quoting maitreye (2021-06-16 18:08:54)
From: Maitreyee Rao <maitreye@xxxxxxxxxxxxxx>
Add trace points across the MSM DP driver to help debug
interop issues.
Signed-off-by: Maitreyee Rao <maitreye@xxxxxxxxxxxxxx>
---
drivers/gpu/drm/msm/dp/dp_aux.c | 5 +++--
drivers/gpu/drm/msm/dp/dp_catalog.c | 4 ++++
drivers/gpu/drm/msm/dp/dp_ctrl.c | 7 +++++++
drivers/gpu/drm/msm/dp/dp_display.c | 16 ++++++++++++++++
drivers/gpu/drm/msm/dp/dp_link.c | 20 +++++++++++++-------
drivers/gpu/drm/msm/dp/dp_panel.c | 2 ++
drivers/gpu/drm/msm/dp/dp_power.c | 3 +++
7 files changed, 48 insertions(+), 9 deletions(-)
diff --git a/drivers/gpu/drm/msm/dp/dp_aux.c
b/drivers/gpu/drm/msm/dp/dp_aux.c
index 4a3293b..5fdff18d 100644
--- a/drivers/gpu/drm/msm/dp/dp_aux.c
+++ b/drivers/gpu/drm/msm/dp/dp_aux.c
@@ -121,9 +121,10 @@ static ssize_t dp_aux_cmd_fifo_tx(struct
dp_aux_private *aux,
time_left = wait_for_completion_timeout(&aux->comp,
msecs_to_jiffies(250));
- if (!time_left)
+ if (!time_left) {
+ DRM_DEBUG_DP("%s aux timeout error timeout:%lu\n",
__func__, time_left);
This will always print 0 for "no time left". Is that useful to know?
I'd
rather we just drop that. Also, __func__ shouldn't be needed given that
__drm_dbg() uses builtin_return_address(). And then, I believe the DP
aux core code already adds logs on the transfer to indicate how it
failed, so probably this whole line can be dropped.
Will fix this
return -ETIMEDOUT;
-
+ }
return ret;
}
diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.c
b/drivers/gpu/drm/msm/dp/dp_catalog.c
index 32f3575..5de5dcd 100644
--- a/drivers/gpu/drm/msm/dp/dp_catalog.c
+++ b/drivers/gpu/drm/msm/dp/dp_catalog.c
@@ -372,6 +372,7 @@ void dp_catalog_ctrl_mainlink_ctrl(struct
dp_catalog *dp_catalog,
struct dp_catalog_private *catalog = container_of(dp_catalog,
struct dp_catalog_private,
dp_catalog);
+ DRM_DEBUG_DP("%s enable=0x%x\n", __func__, enable);
Again, drop __func__. 'enable' is a bool, why is printed in hex format?
Will fix this
if (enable) {
/*
* To make sure link reg writes happens before other
operation,
@@ -580,6 +581,7 @@ void dp_catalog_hpd_config_intr(struct dp_catalog
*dp_catalog,
config = (en ? config | intr_mask : config & ~intr_mask);
+ DRM_DEBUG_DP("%s intr_mask=0x%x config=0x%x\n", __func__,
intr_mask, config);
dp_write_aux(catalog, REG_DP_DP_HPD_INT_MASK,
config & DP_DP_HPD_INT_MASK);
}
@@ -610,6 +612,7 @@ u32 dp_catalog_link_is_connected(struct dp_catalog
*dp_catalog)
u32 status;
status = dp_read_aux(catalog, REG_DP_DP_HPD_INT_STATUS);
+ DRM_DEBUG_DP("%s aux status:0x%x\n", __func__, status);
status >>= DP_DP_HPD_STATE_STATUS_BITS_SHIFT;
status &= DP_DP_HPD_STATE_STATUS_BITS_MASK;
@@ -685,6 +688,7 @@ void dp_catalog_ctrl_send_phy_pattern(struct
dp_catalog *dp_catalog,
/* Make sure to clear the current pattern before starting a
new one */
dp_write_link(catalog, REG_DP_STATE_CTRL, 0x0);
+ DRM_DEBUG_DP("%s pattern:0x%x\n", __func__, pattern);
switch (pattern) {
case DP_PHY_TEST_PATTERN_D10_2:
dp_write_link(catalog, REG_DP_STATE_CTRL,
diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c
b/drivers/gpu/drm/msm/dp/dp_ctrl.c
index 2a8955c..7fd1e3f 100644
--- a/drivers/gpu/drm/msm/dp/dp_ctrl.c
+++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c
@@ -99,6 +99,7 @@ static int dp_aux_link_configure(struct drm_dp_aux
*aux,
values[0] = drm_dp_link_rate_to_bw_code(link->rate);
values[1] = link->num_lanes;
+ DRM_DEBUG_DP("%s value0:0x%x value1:0x%x\n", __func__,
values[0], values[1]);
The drm_dp_dpcd_write() soon after should tell us what this is, so is
this necessary?
You are right, will fix this.
if (link->capabilities & DP_LINK_CAP_ENHANCED_FRAMING)
values[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
@@ -122,6 +123,7 @@ void dp_ctrl_push_idle(struct dp_ctrl *dp_ctrl)
IDLE_PATTERN_COMPLETION_TIMEOUT_JIFFIES))
pr_warn("PUSH_IDLE pattern timedout\n");
+ DRM_DEBUG_DP("PUSH IDLE\n");
pr_debug("mainlink off done\n");
Can these two printks be combined into one DRM_DEBUG_DP()?
Sure, will do that.
}
@@ -1013,6 +1015,8 @@ static int dp_ctrl_update_vx_px(struct
dp_ctrl_private *ctrl)
u32 voltage_swing_level = link->phy_params.v_level;
u32 pre_emphasis_level = link->phy_params.p_level;
+ DRM_DEBUG_DP("%s: voltage level:%d emphasis level:%d\n",
__func__,
Can we unstick the colon : from the printk format?
Yes, will fix it.
voltage level: %d emphasis level: %d
+ voltage_swing_level, pre_emphasis_level);
ret = dp_catalog_ctrl_update_vx_px(ctrl->catalog,
voltage_swing_level, pre_emphasis_level);
@@ -1112,6 +1116,8 @@ static int dp_ctrl_link_train_1(struct
dp_ctrl_private *ctrl,
cr->lane_0_1 = link_status[0];
cr->lane_2_3 = link_status[1];
+ DRM_DEBUG_DP("link status:0x%x 0x%x 0x%x 0x%x 0x%x\n",
link_status[0],
+ link_status[1], link_status[2],
link_status[3], link_status[4]);
Again, the drm_dp_dpcd_read_link_status() code will print this for us
so
this is redundant.
Yes, you are right will fix it.
if (drm_dp_clock_recovery_ok(link_status,
ctrl->link->link_params.num_lanes)) {
return 0;
@@ -1384,6 +1390,7 @@ int dp_ctrl_host_init(struct dp_ctrl *dp_ctrl,
bool flip, bool reset)
if (reset)
dp_catalog_ctrl_reset(ctrl->catalog);
+ DRM_DEBUG_DP("%s Flip:%d\n", __func__, flip);
Maybe
"%s", flip ? "flipped" : "not flipped"
or
"flip=%d", flip
Yes, will fix it.
dp_catalog_ctrl_phy_reset(ctrl->catalog);
phy_init(phy);
dp_catalog_ctrl_enable_irq(ctrl->catalog, true);
diff --git a/drivers/gpu/drm/msm/dp/dp_display.c
b/drivers/gpu/drm/msm/dp/dp_display.c
index cf9c645..b471fe4 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -275,6 +275,8 @@ static bool dp_display_is_ds_bridge(struct
dp_panel *panel)
static bool dp_display_is_sink_count_zero(struct dp_display_private
*dp)
{
+ DRM_DEBUG_DP("%s present=0x%x sink_count=%d\n", __func__,
We can use %#x for the 0x prefix.
Thanks , will fix this.
+ dp->panel->dpcd[DP_DOWNSTREAMPORT_PRESENT],
dp->link->sink_count);
return dp_display_is_ds_bridge(dp->panel) &&
(dp->link->sink_count == 0);
}
@@ -320,6 +322,7 @@ static int dp_display_send_hpd_notification(struct
dp_display_private *dp,
dp->dp_display.is_connected = hpd;
+ DRM_DEBUG_DP("%s hpd=%d\n", __func__, hpd);
dp_display_send_hpd_event(&dp->dp_display);
return 0;
@@ -369,6 +372,8 @@ static void dp_display_host_init(struct
dp_display_private *dp, int reset)
{
bool flip = false;
+ DRM_DEBUG_DP("%s core_initialized=%d", __func__,
dp->core_initialized);
Missing newline.
Thanks, will add it
+
if (dp->core_initialized) {
DRM_DEBUG_DP("DP core already initialized\n");
return;
@@ -483,8 +488,10 @@ static int dp_display_handle_irq_hpd(struct
dp_display_private *dp)
{
u32 sink_request = dp->link->sink_request;
+ DRM_DEBUG_DP("%s %d\n", __func__, sink_request);
if (dp->hpd_state == ST_DISCONNECTED) {
if (sink_request & DP_LINK_STATUS_UPDATED) {
+ DRM_DEBUG_DP("%s:Disconnected
sink_count:%d\n", __func__, sink_request);
DRM_ERROR("Disconnected, no
DP_LINK_STATUS_UPDATED\n");
return -EINVAL;
}
@@ -509,6 +516,7 @@ static int dp_display_usbpd_attention_cb(struct
device *dev)
DRM_ERROR("invalid dev\n");
return -EINVAL;
}
+ DRM_DEBUG_DP("%s sink_request:%d\n", __func__, sink_request);
dp = container_of(g_dp_display,
struct dp_display_private, dp_display);
@@ -523,6 +531,8 @@ 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;
+ DRM_DEBUG_DP("%s hpd_state=%d sink_count=%d\n",
__func__,
+ dp->hpd_state, sink_request);
if (sink_request & DS_PORT_STATUS_CHANGED)
rc =
dp_display_handle_port_ststus_changed(dp);
else
@@ -545,6 +555,7 @@ static int dp_hpd_plug_handle(struct
dp_display_private *dp, u32 data)
mutex_lock(&dp->event_mutex);
state = dp->hpd_state;
+ DRM_DEBUG_DP("%s hpd_state=%d\n", __func__, state);
if (state == ST_DISPLAY_OFF || state == ST_SUSPENDED) {
mutex_unlock(&dp->event_mutex);
return 0;
@@ -680,6 +691,7 @@ static int dp_hpd_unplug_handle(struct
dp_display_private *dp, u32 data)
/* start sentinel checking in case of missing uevent */
dp_add_event(dp, EV_DISCONNECT_PENDING_TIMEOUT, 0,
DP_TIMEOUT_5_SECOND);
+ DRM_DEBUG_DP("%s hpd_state=%d\n", __func__, state);
/* signal the disconnect event early to ensure proper teardown
*/
dp_display_handle_plugged_change(g_dp_display, false);
@@ -738,6 +750,7 @@ static int dp_irq_hpd_handle(struct
dp_display_private *dp, u32 data)
if (ret == -ECONNRESET) { /* cable unplugged */
dp->core_initialized = false;
}
+ DRM_DEBUG_DP("%s hpd_state=%d\n", __func__, state);
mutex_unlock(&dp->event_mutex);
@@ -882,6 +895,7 @@ static int dp_display_enable(struct
dp_display_private *dp, u32 data)
dp_display = g_dp_display;
+ DRM_DEBUG_DP("%s sink_count=%d\n", __func__,
dp->link->sink_count);
if (dp_display->power_on) {
DRM_DEBUG_DP("Link already setup, return\n");
return 0;
@@ -943,6 +957,7 @@ static int dp_display_disable(struct
dp_display_private *dp, u32 data)
dp_display->power_on = false;
+ DRM_DEBUG_DP("%s: sink count:%d\n", __func__,
dp->link->sink_count);
return 0;
}
@@ -1190,6 +1205,7 @@ static irqreturn_t dp_display_irq_handler(int
irq, void *dev_id)
hpd_isr_status = dp_catalog_hpd_get_intr_status(dp->catalog);
+ DRM_DEBUG_DP("%s: hpd isr status:%x\n", __func__,
hpd_isr_status);
This one could have %#x
yes will fix this.
if (hpd_isr_status & 0x0F) {
/* hpd related interrupts */
if (hpd_isr_status & DP_DP_HPD_PLUG_INT_MASK ||
diff --git a/drivers/gpu/drm/msm/dp/dp_link.c
b/drivers/gpu/drm/msm/dp/dp_link.c
index be986da..f858a8c 100644
--- a/drivers/gpu/drm/msm/dp/dp_link.c
+++ b/drivers/gpu/drm/msm/dp/dp_link.c
@@ -973,6 +973,9 @@ static int
dp_link_process_link_status_update(struct dp_link_private *link)
*/
static int dp_link_process_ds_port_status_change(struct
dp_link_private *link)
{
+ DRM_DEBUG_DP("link status 0:0x%x 1:0x%x 2:0x%x 3:0x%x 4:0x%x",
link->link_status[0],
+ link->link_status[1], link->link_status[2],
+ link->link_status[3], link->link_status[4]);
Is it useful to have the link status before it is gotten in the line
below? Also, get_link_status() seems to subtract a value and return it
vs. care about 5 elements.
Yes , I checked again and the dp_link_parse_status_field() already calls
drm_dp_dpcd_read_link_status() so we do not need this and I will
remove it.
if (get_link_status(link->link_status,
DP_LANE_ALIGN_STATUS_UPDATED) &
DP_DOWNSTREAM_PORT_STATUS_CHANGED)
goto reset;
@@ -1036,43 +1039,46 @@ int dp_link_process_request(struct dp_link
*dp_link)
if (link->request.test_requested == DP_TEST_LINK_EDID_READ) {
dp_link->sink_request |= DP_TEST_LINK_EDID_READ;
- return ret;
+ goto error;
}
ret = dp_link_process_ds_port_status_change(link);
if (!ret) {
dp_link->sink_request |= DS_PORT_STATUS_CHANGED;
- return ret;
+ goto error;
}
ret = dp_link_process_link_training_request(link);
if (!ret) {
dp_link->sink_request |= DP_TEST_LINK_TRAINING;
- return ret;
+ goto error;
}
ret = dp_link_process_phy_test_pattern_request(link);
if (!ret) {
dp_link->sink_request |=
DP_TEST_LINK_PHY_TEST_PATTERN;
- return ret;
+ goto error;
}
ret = dp_link_process_link_status_update(link);
if (!ret) {
dp_link->sink_request |= DP_LINK_STATUS_UPDATED;
- return ret;
+ goto error;
}
if (dp_link_is_video_pattern_requested(link)) {
- ret = 0;
ret is not zero here, right? But now we dropped it?
ret is defaulted to zero at the beginning of the function and so this is
redundant and I got rid of it.
dp_link->sink_request |= DP_TEST_LINK_VIDEO_PATTERN;
+ goto error;
}
if (dp_link_is_audio_pattern_requested(link)) {
dp_link->sink_request |= DP_TEST_LINK_AUDIO_PATTERN;
- return -EINVAL;
+ ret = -EINVAL;
+ goto error;
}
+error:
Is it an error? More like "out".
Yes, will make that change.
+ DRM_DEBUG_DP("%s sink request:%x", __func__,
dp_link->sink_request);
return ret;
}
diff --git a/drivers/gpu/drm/msm/dp/dp_panel.c
b/drivers/gpu/drm/msm/dp/dp_panel.c
index 88196f7..71db071 100644
--- a/drivers/gpu/drm/msm/dp/dp_panel.c
+++ b/drivers/gpu/drm/msm/dp/dp_panel.c
@@ -66,6 +66,8 @@ static int dp_panel_read_dpcd(struct dp_panel
*dp_panel)
goto end;
}
+ DRM_DEBUG_DP("%s 0x%x 0x%x 0x%x 0x%x 0x%x\n", __func__,
dpcd[0],
+ dpcd[1], dpcd[2], dpcd[3], dpcd[4]);
Please drop as drm_dp_dpcd_read() should already print it.
yes, you are right, will fix this.
link_info->revision = dpcd[DP_DPCD_REV];
major = (link_info->revision >> 4) & 0x0f;
minor = link_info->revision & 0x0f;
diff --git a/drivers/gpu/drm/msm/dp/dp_power.c
b/drivers/gpu/drm/msm/dp/dp_power.c
index 3961ba4..2271941 100644
--- a/drivers/gpu/drm/msm/dp/dp_power.c
+++ b/drivers/gpu/drm/msm/dp/dp_power.c
@@ -208,6 +208,9 @@ static int dp_power_clk_set_rate(struct
dp_power_private *power,
int dp_power_clk_status(struct dp_power *dp_power, enum dp_pm_type
pm_type)
{
+ DRM_DEBUG_DP("%s core_clk_on=%d link_clk_on%d
stream_clk_on=%d\n", __func__,
Missing = on link_clk_on?
Yes, thank you, will add it.
+ dp_power->core_clks_on,
dp_power->link_clks_on, dp_power->stream_clks_on);
+
if (pm_type == DP_CORE_PM)
return dp_power->core_clks_on;
