Hi, Rex:
On Fri, 2022-06-10 at 18:55 +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>
> [Bo-Chen: Cleanup the drivers and modify comments from reviewers]
> Signed-off-by: Bo-Chen Chen <rex-bc.chen@xxxxxxxxxxxx>
> ---
[snip]
> +
> +static void mtk_dp_poweroff(struct mtk_dp *mtk_dp)
> +{
> + mutex_lock(&mtk_dp->dp_lock);
> +
> + mtk_dp_hwirq_enable(mtk_dp, false);
> + mtk_dp_power_disable(mtk_dp);
> + phy_exit(mtk_dp->phy);
> +
> + mutex_unlock(&mtk_dp->dp_lock);
> +}
> +
> +static int mtk_dp_poweron(struct mtk_dp *mtk_dp)
> +{
> + int ret = 0;
> +
> + mutex_lock(&mtk_dp->dp_lock);
The dp_poweron/off is only called by bridge_attach/detach, and I think
drm core would not call attach/detach concurrently, so this mutex is
redundant. Remove it.
Regards,
CK
> +
> + ret = phy_init(mtk_dp->phy);
> + if (ret) {
> + dev_err(mtk_dp->dev, "Failed to initialize phy: %d\n",
> ret);
> + goto err_phy_init;
> + }
> + ret = mtk_dp_phy_configure(mtk_dp, MTK_DP_LINKRATE_RBR, 1);
> + if (ret) {
> + dev_err(mtk_dp->dev, "Failed to configure phy: %d\n",
> ret);
> + goto err_phy_config;
> + }
> +
> + mtk_dp_init_port(mtk_dp);
> + mtk_dp_power_enable(mtk_dp);
> +
> +err_phy_config:
> + phy_exit(mtk_dp->phy);
> +err_phy_init:
> + mutex_unlock(&mtk_dp->dp_lock);
> + return ret;
> +}
