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drm/hisilicon/hibmc: Add dp serdes cfg to adjust serdes rate, voltage and pre-emphasis

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This dp controller need features of digital-to-analog conversion and
high-speed transmission in chip by its extern serdes controller. Our
serdes cfg is relatively simple, just need two register configurations.
Don't need too much functions, like: power on/off, initialize, and some
complex configurations, so I'm not going to use the phy framework.
This serdes is inited and configured in dp initialization, and also
integrating them into link training process.

For rate changing, we can change from 1.62-8.2Gpbs by cfg reg.
For voltage and pre-emphasis levels changing, we can cfg different
serdes ffe value.

Signed-off-by: Baihan Li <libaihan@huawei.com>
Signed-off-by: Yongbang Shi <shiyongbang@huawei.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20250331074212.3370287-3-shiyongbang@huawei.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
This commit is contained in:
Baihan Li 2025-03-31 15:42:05 +08:00 • committed by Dmitry Baryshkov
commit 9e736cd444
5 changed files with 104 additions and 1 deletions
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