From: Hermes Wu <Hermes.wu@ite.com.tw>
When connect to device that can only training done by step training,
skip auto training when link training restart before unplug device.
The driver performs a full cycle of attempting auto link training and
then manual link training on each modeset. Save time by skipping the
auto training if it failed previously for this monitor
Signed-off-by: Hermes Wu <Hermes.wu@ite.com.tw>
---
drivers/gpu/drm/bridge/ite-it6505.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c
index bff5f18fb5ae7192242308f034b60af9807c192c..20eae23cb46a4cb3fc18dd2ed3b764f2265262ca 100644
--- a/drivers/gpu/drm/bridge/ite-it6505.c
+++ b/drivers/gpu/drm/bridge/ite-it6505.c
@@ -467,6 +467,7 @@ struct it6505 {
struct delayed_work hdcp_work;
struct work_struct hdcp_wait_ksv_list;
struct completion extcon_completion;
+ u8 step_train_only;
bool hdcp_desired;
bool is_repeater;
u8 hdcp_down_stream_count;
@@ -2452,11 +2453,13 @@ static void it6505_link_step_train_process(struct it6505 *it6505)
ret ? "pass" : "failed", i + 1);
if (ret) {
it6505_link_train_ok(it6505);
+ it6505->step_train_only = true;
return;
}
}
DRM_DEV_DEBUG_DRIVER(dev, "training fail");
+ it6505->step_train_only = false;
it6505->link_state = LINK_IDLE;
it6505_video_reset(it6505);
}
@@ -2473,14 +2476,14 @@ static void it6505_link_training_work(struct work_struct *work)
if (!it6505_get_sink_hpd_status(it6505))
return;
- for (retry = AUTO_TRAIN_RETRY; retry > 0; retry--) {
+ for (retry = AUTO_TRAIN_RETRY; retry > 0 && !it6505->step_train_only; retry--) {
it6505_link_training_setup(it6505);
it6505_reset_hdcp(it6505);
it6505_aux_reset(it6505);
ret = it6505_link_start_auto_train(it6505);
DRM_DEV_DEBUG_DRIVER(dev, "auto train %s,",
- ret ? "pass" : "failed");
+ ret ? "pass" : "failed");
if (ret) {
it6505_link_train_ok(it6505);
return;
@@ -2594,6 +2597,7 @@ static void it6505_irq_hpd(struct it6505 *it6505)
it6505_variable_config(it6505);
it6505_parse_link_capabilities(it6505);
}
+ it6505->step_train_only = false;
it6505_drm_dp_link_set_power(&it6505->aux, &it6505->link,
DP_SET_POWER_D0);
--
2.34.1