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Message-Id: <20250326-fix-link-training-v2-4-756c8306f500@ite.com.tw>
Date: Wed, 26 Mar 2025 13:34:16 +0800
From: Hermes Wu via B4 Relay <devnull+Hermes.wu.ite.com.tw@...nel.org>
To: Andrzej Hajda <andrzej.hajda@...el.com>,
Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>,
Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
Jonas Karlman <jonas@...boo.se>, Jernej Skrabec <jernej.skrabec@...il.com>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>
Cc: Pet.Weng@....com.tw, Kenneth.Hung@....com.tw, treapking@...omium.org,
dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
Hermes Wu <Hermes.wu@....com.tw>
Subject: [PATCH v2 4/5] drm/bridge: it6505: modify DP link training work
From: Hermes Wu <Hermes.wu@....com.tw>
The DP link training work include auto training and after
auto training failed "AUTO_TRAIN_RETRY" times, it switch to
step training mode.
It will more efficiency that finish link auto training,
include retry, and step training in a work, rather than
re-schedule train work when each training fail.
Drop auto_train_retry from it6505 structure,
and it6505_dump() is remove from link trainig work,
it takes too much time to read all register area,
and is not necessary.
Signed-off-by: Hermes Wu <Hermes.wu@....com.tw>
---
drivers/gpu/drm/bridge/ite-it6505.c | 40 ++++++++++++++-----------------------
1 file changed, 15 insertions(+), 25 deletions(-)
diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c
index e0e13e737763fb801fd1cd803734a0d6ae1dd812..2bbe787ccb1b57906f2a31a011dd92f327019b08 100644
--- a/drivers/gpu/drm/bridge/ite-it6505.c
+++ b/drivers/gpu/drm/bridge/ite-it6505.c
@@ -467,7 +467,6 @@ struct it6505 {
struct delayed_work hdcp_work;
struct work_struct hdcp_wait_ksv_list;
struct completion extcon_completion;
- u8 auto_train_retry;
bool hdcp_desired;
bool is_repeater;
u8 hdcp_down_stream_count;
@@ -666,7 +665,7 @@ static int it6505_get_dpcd(struct it6505 *it6505, int offset, u8 *dpcd, int num)
return 0;
}
-static void it6505_dump(struct it6505 *it6505)
+static void __maybe_unused it6505_dump(struct it6505 *it6505)
{
unsigned int i, j;
u8 regs[16];
@@ -1399,7 +1398,6 @@ static void it6505_variable_config(struct it6505 *it6505)
it6505->lane_count = MAX_LANE_COUNT;
it6505->link_state = LINK_IDLE;
it6505->hdcp_desired = HDCP_DESIRED;
- it6505->auto_train_retry = AUTO_TRAIN_RETRY;
it6505->audio.select = AUDIO_SELECT;
it6505->audio.sample_rate = AUDIO_SAMPLE_RATE;
it6505->audio.channel_count = AUDIO_CHANNEL_COUNT;
@@ -2472,7 +2470,7 @@ static void it6505_link_training_work(struct work_struct *work)
{
struct it6505 *it6505 = container_of(work, struct it6505, link_works);
struct device *dev = it6505->dev;
- int ret;
+ int ret, retry;
DRM_DEV_DEBUG_DRIVER(dev, "it6505->sink_count: %d",
it6505->sink_count);
@@ -2480,27 +2478,22 @@ static void it6505_link_training_work(struct work_struct *work)
if (!it6505_get_sink_hpd_status(it6505))
return;
- it6505_link_training_setup(it6505);
- it6505_reset_hdcp(it6505);
- it6505_aux_reset(it6505);
-
- if (it6505->auto_train_retry < 1) {
- it6505_link_step_train_process(it6505);
- return;
- }
-
- ret = it6505_link_start_auto_train(it6505);
- DRM_DEV_DEBUG_DRIVER(dev, "auto train %s, auto_train_retry: %d",
- ret ? "pass" : "failed", it6505->auto_train_retry);
+ for (retry = AUTO_TRAIN_RETRY; retry > 0; retry--) {
+ it6505_link_training_setup(it6505);
+ it6505_reset_hdcp(it6505);
+ it6505_aux_reset(it6505);
- if (ret) {
- it6505->auto_train_retry = AUTO_TRAIN_RETRY;
- it6505_link_train_ok(it6505);
- } else {
- it6505->auto_train_retry--;
- it6505_dump(it6505);
+ ret = it6505_link_start_auto_train(it6505);
+ DRM_DEV_DEBUG_DRIVER(dev, "auto train %s,",
+ ret ? "pass" : "failed");
+ if (ret) {
+ it6505_link_train_ok(it6505);
+ return;
+ }
}
+ /*After HW auto training fail, try link training step by step*/
+ it6505_link_step_train_process(it6505);
}
static void it6505_plugged_status_to_codec(struct it6505 *it6505)
@@ -2581,7 +2574,6 @@ static int it6505_process_hpd_irq(struct it6505 *it6505)
(int)ARRAY_SIZE(link_status), link_status);
if (!drm_dp_channel_eq_ok(link_status, it6505->lane_count)) {
- it6505->auto_train_retry = AUTO_TRAIN_RETRY;
it6505_video_reset(it6505);
}
@@ -2607,7 +2599,6 @@ static void it6505_irq_hpd(struct it6505 *it6505)
it6505_variable_config(it6505);
it6505_parse_link_capabilities(it6505);
}
- it6505->auto_train_retry = AUTO_TRAIN_RETRY;
it6505_drm_dp_link_set_power(&it6505->aux, &it6505->link,
DP_SET_POWER_D0);
@@ -2744,7 +2735,6 @@ static void it6505_irq_video_handler(struct it6505 *it6505, const int *int_statu
(unsigned int *)int_status)) ||
(it6505_test_bit(BIT_INT_VID_FIFO_ERROR,
(unsigned int *)int_status))) {
- it6505->auto_train_retry = AUTO_TRAIN_RETRY;
flush_work(&it6505->link_works);
it6505_stop_hdcp(it6505);
it6505_video_reset(it6505);
--
2.34.1
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