[PATCH v3 5/5] drm/bridge: it6505: skip auto training when previous try fail

[Hermes Wu via B4 Relay]

From: Hermes Wu <hermes...@ite.com.tw>

When connect to device which can only training done by
step training, skip auto training when link training restart,
usually happen when display resolution is changed.

Signed-off-by: Hermes Wu <hermes...@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