Hi, Bo-Chen:
On Tue, 2022-07-12 at 19:12 +0800, Bo-Chen Chen wrote:
> From: Markus Schneider-Pargmann <msp@xxxxxxxxxxxx>
>
> This patch adds a embedded displayport driver for the MediaTek mt8195
> SoC.
>
> It supports the MT8195, the embedded DisplayPort units. It offers
> DisplayPort 1.4 with up to 4 lanes.
>
> The driver creates a child device for the phy. The child device will
> never exist without the parent being active. As they are sharing a
> register range, the parent passes a regmap pointer to the child so
> that
> both can work with the same register range. The phy driver sets
> device
> data that is read by the parent to get the phy device that can be
> used
> to control the phy properties.
>
> This driver is based on an initial version by
> Jitao shi <jitao.shi@xxxxxxxxxxxx>
>
> Signed-off-by: Markus Schneider-Pargmann <msp@xxxxxxxxxxxx>
> Signed-off-by: Guillaume Ranquet <granquet@xxxxxxxxxxxx>
> Signed-off-by: Bo-Chen Chen <rex-bc.chen@xxxxxxxxxxxx>
> ---
[snip]
> +
> +static int mtk_dp_training(struct mtk_dp *mtk_dp)
> +{
> + short max_retry = 50;
> + int ret;
> +
> + do {
> + ret = mtk_dp_train_start(mtk_dp);
> + if (!ret)
> + break;
> + else if (ret != -EAGAIN)
> + return ret;
> + } while (--max_retry);
mtk_dp_train_start() would never return -EAGAIN, so drop this while
loop.
Regards,
CK
>
> + if (!max_retry)
> + return -ETIMEDOUT;
> +
> + ret = mtk_dp_video_config(mtk_dp);
> + if (ret)
> + return ret;
> + mtk_dp_video_enable(mtk_dp, true);
> +
> + return 0;
> +}
> +
