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drm/bridge: Fixed a DP link training bug

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To have better compatibility for DP sink, there is a retry mechanism
for the link training process to switch between different training process.
The original driver code doesn't reset the retry counter when training
state is pass. If the system triggers link training over 3 times,
there will be a chance to causes the driver to use the wrong training
method and return a training fail result.

To Fix this, we reset the retry counter when training state is pass
each time.

Signed-off-by: Allen Chen <allen.chen@ite.corp-partner.google.com>
Signed-off-by: xiazhengqiao <xiazhengqiao@huaqin.corp-partner.google.com>
Reviewed-by: Robert Foss <rfoss@kernel.org>
Signed-off-by: Robert Foss <rfoss@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20231221093057.7073-1-xiazhengqiao@huaqin.corp-partner.google.com
This commit is contained in:
xiazhengqiao 2023-12-21 17:30:57 +08:00 committed by Robert Foss
parent 219a1f4909
commit ca077ff8ca
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1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/bridge/ite-it6505.c
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@ -2240,11 +2240,13 @@ static void it6505_link_training_work(struct work_struct *work)
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);
it6505->auto_train_retry--;
if (ret) {
it6505->auto_train_retry = AUTO_TRAIN_RETRY;
it6505_link_train_ok(it6505);
return;
} else {
it6505->auto_train_retry--;
}
it6505_dump(it6505);