[PATCH 3/3] drm/panel: add panel driver for Elida KD35T133 panels

[Francesco Lavra]

On 2/23/20 4:07 PM, Heiko Stuebner wrote:
> +static int kd35t133_unprepare(struct drm_panel *panel)
> +{
> +	struct kd35t133 *ctx = panel_to_kd35t133(panel);
> +	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
> +	int ret;
> +
> +	if (!ctx->prepared)
> +		return 0;
> +
> +	ret = mipi_dsi_dcs_set_display_off(dsi);
> +	if (ret < 0)
> +		DRM_DEV_ERROR(ctx->dev, "failed to set display off: %d\n",
> +			      ret);
> +
> +	mipi_dsi_dcs_enter_sleep_mode(dsi);
> +	if (ret < 0) {
> +		DRM_DEV_ERROR(ctx->dev, "failed to enter sleep mode: %d\n",
> +			      ret);

It looks like you forgot to assign the return value from 
mipi_dsi_dcs_enter_sleep_mode() to ret.

> +		return ret;
> +	}
> +
> +	regulator_disable(ctx->iovcc);
> +	regulator_disable(ctx->vdd);
> +
> +	ctx->prepared = false;
> +
> +	return 0;
> +}