[PATCH v13 05/10] drm/mediatek: Add MT8195 Embedded DisplayPort driver

[CK Hu]

Hi, Bo-Chen:

On Fri, 2022-07-01 at 14:28 +0800, Bo-Chen Chen wrote:
> From: Markus Schneider-Pargmann <msp at baylibre.com>
> 
> 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 at mediatek.com>
> 
> Signed-off-by: Markus Schneider-Pargmann <msp at baylibre.com>
> Signed-off-by: Guillaume Ranquet <granquet at baylibre.com>
> Signed-off-by: Bo-Chen Chen <rex-bc.chen at mediatek.com>
> ---

[snip]

> +
> +static ssize_t mtk_dp_hpd_sink_event(struct mtk_dp *mtk_dp)

The caller never use the return value, so let this function to void.

> +{
> +	ssize_t ret;
> +	u8 sink_count;
> +	u8 link_status[DP_LINK_STATUS_SIZE] = {};
> +	u32 sink_count_reg = DP_SINK_COUNT_ESI;
> +	u32 link_status_reg = DP_LANE0_1_STATUS;
> +
> +	ret = drm_dp_dpcd_readb(&mtk_dp->aux, sink_count_reg,
> &sink_count);

You read sink_count but never use it, so this read is redundant. Remove
it.

> +	if (ret < 1) {
> +		drm_err(mtk_dp->drm_dev, "Read sink count failed\n");
> +		return ret == 0 ? -EIO : ret;
> +	}
> +
> +	ret = drm_dp_dpcd_read(&mtk_dp->aux, link_status_reg,
> link_status,
> +			       sizeof(link_status));
> +	if (!ret) {
> +		drm_err(mtk_dp->drm_dev, "Read link status failed\n");
> +		return ret;
> +	}
> +
> +	drm_dp_channel_eq_ok(link_status, mtk_dp-
> >train_info.lane_count);

This function just return true or false, and you does not process the
return value, so this is redundant. Remove it.

Regard,
CK

> +
> +	if (link_status[1] & DP_REMOTE_CONTROL_COMMAND_PENDING)
> +		drm_dp_dpcd_writeb(&mtk_dp->aux,
> DP_DEVICE_SERVICE_IRQ_VECTOR,
> +				   DP_REMOTE_CONTROL_COMMAND_PENDING);
> +
> +	return 0;
> +}