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SubjectRe: [PATCH v10 18/21] drm/mediatek: Add mt8195 Embedded DisplayPort driver
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Hi, Guillaume:

On Mon, 2022-05-23 at 12:47 +0200, Guillaume Ranquet wrote:
> From: Markus Schneider-Pargmann <msp@baylibre.com>
>
> This patch adds a 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
> Jason-JH.Lin <jason-jh.lin@mediatek.com>.
>
> Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
> Signed-off-by: Guillaume Ranquet <granquet@baylibre.com>
> ---
>

[snip]

> +
> +static irqreturn_t mtk_dp_hpd_isr_handler(struct mtk_dp *mtk_dp)
> +{
> + bool connected;
> + u16 swirq_status = mtk_dp_swirq_get_clear(mtk_dp);
> + u8 hwirq_status = mtk_dp_hwirq_get_clear(mtk_dp);
> + struct mtk_dp_train_info *train_info = &mtk_dp->train_info;
> +
> + train_info->irq_status |= hwirq_status | swirq_status;

You mix software control variable and irq status here. Break each flag
in irq_status to variables in train_info to decouple software control
variable and irq status.

> +
> + if (!train_info->irq_status)
> + return IRQ_HANDLED;
> +
> + connected = mtk_dp_plug_state(mtk_dp);
> + if (connected || !train_info->cable_plugged_in)
> + train_info->irq_status &= ~MTK_DP_HPD_DISCONNECT;
> + else if (!connected || train_info->cable_plugged_in)
> + train_info->irq_status &= ~MTK_DP_HPD_CONNECT;
> +
> + if (!(train_info->irq_status &
> + (MTK_DP_HPD_CONNECT | MTK_DP_HPD_DISCONNECT)))
> + return IRQ_HANDLED;
> +
> + if (train_info->irq_status & MTK_DP_HPD_CONNECT) {
> + train_info->irq_status &= ~MTK_DP_HPD_CONNECT;
> + train_info->cable_plugged_in = true;
> + } else {
> + train_info->irq_status &= ~MTK_DP_HPD_DISCONNECT;
> + train_info->cable_plugged_in = false;
> + mtk_dp->train_state = MTK_DP_TRAIN_STATE_STARTUP;
> + }
> + train_info->cable_state_change = true;
> +
> + return IRQ_WAKE_THREAD;
> +}
> +

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