Re: [PATCH v3 2/5] drm/panel: st7701: Decouple DSI and DRM parts

[Neil Armstrong <neil.armstrong@linaro.org>]

On 06/07/2024 12:23, Hironori KIKUCHI wrote:
> Split into a DSI-specific part and a DRM-specific part.
> 
> Additionally, use devm_add_action_or_reset() to simplify the flow,
> and disable and unprepare the panel on cleanup.
> 
> Signed-off-by: Hironori KIKUCHI <kikuchan98@gmail.com>
> ---
>   drivers/gpu/drm/panel/panel-sitronix-st7701.c | 72 ++++++++++++-------
>   1 file changed, 45 insertions(+), 27 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panel/panel-sitronix-st7701.c b/drivers/gpu/drm/panel/panel-sitronix-st7701.c
> index a9a8fd85057..a0644f7a4c8 100644
> --- a/drivers/gpu/drm/panel/panel-sitronix-st7701.c
> +++ b/drivers/gpu/drm/panel/panel-sitronix-st7701.c
> @@ -539,7 +539,7 @@ static int st7701_get_modes(struct drm_panel *panel,
>   
>   	mode = drm_mode_duplicate(connector->dev, desc_mode);
>   	if (!mode) {
> -		dev_err(&st7701->dsi->dev, "failed to add mode %ux%u@%u\n",
> +		dev_err(panel->dev, "failed to add mode %ux%u@%u\n",
>   			desc_mode->hdisplay, desc_mode->vdisplay,
>   			drm_mode_vrefresh(desc_mode));
>   		return -ENOMEM;
> @@ -974,42 +974,48 @@ static const struct st7701_panel_desc rg_arc_desc = {
>   	.gip_sequence = rg_arc_gip_sequence,
>   };
>   
> -static int st7701_dsi_probe(struct mipi_dsi_device *dsi)
> +static void st7701_cleanup(void *data)
> +{
> +	struct st7701 *st7701 = (struct st7701 *)data;
> +
> +	drm_panel_remove(&st7701->panel);
> +	drm_panel_disable(&st7701->panel);
> +	drm_panel_unprepare(&st7701->panel);
> +}
> +
> +static int st7701_probe(struct device *dev, int connector_type)
>   {
>   	const struct st7701_panel_desc *desc;
>   	struct st7701 *st7701;
>   	int ret;
>   
> -	st7701 = devm_kzalloc(&dsi->dev, sizeof(*st7701), GFP_KERNEL);
> +	st7701 = devm_kzalloc(dev, sizeof(*st7701), GFP_KERNEL);
>   	if (!st7701)
>   		return -ENOMEM;
>   
> -	desc = of_device_get_match_data(&dsi->dev);
> -	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
> -			  MIPI_DSI_MODE_LPM | MIPI_DSI_CLOCK_NON_CONTINUOUS;
> -	dsi->format = desc->format;
> -	dsi->lanes = desc->lanes;
> +	desc = of_device_get_match_data(dev);
> +	if (!desc)
> +		return -ENODEV;
>   
>   	st7701->supplies[0].supply = "VCC";
>   	st7701->supplies[1].supply = "IOVCC";
>   
> -	ret = devm_regulator_bulk_get(&dsi->dev, ARRAY_SIZE(st7701->supplies),
> +	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(st7701->supplies),
>   				      st7701->supplies);
>   	if (ret < 0)
>   		return ret;
>   
> -	st7701->reset = devm_gpiod_get(&dsi->dev, "reset", GPIOD_OUT_LOW);
> +	st7701->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
>   	if (IS_ERR(st7701->reset)) {
> -		dev_err(&dsi->dev, "Couldn't get our reset GPIO\n");
> +		dev_err(dev, "Couldn't get our reset GPIO\n");
>   		return PTR_ERR(st7701->reset);
>   	}
>   
> -	ret = of_drm_get_panel_orientation(dsi->dev.of_node, &st7701->orientation);
> +	ret = of_drm_get_panel_orientation(dev->of_node, &st7701->orientation);
>   	if (ret < 0)
> -		return dev_err_probe(&dsi->dev, ret, "Failed to get orientation\n");
> +		return dev_err_probe(dev, ret, "Failed to get orientation\n");
>   
> -	drm_panel_init(&st7701->panel, &dsi->dev, &st7701_funcs,
> -		       DRM_MODE_CONNECTOR_DSI);
> +	drm_panel_init(&st7701->panel, dev, &st7701_funcs, connector_type);
>   
>   	/**
>   	 * Once sleep out has been issued, ST7701 IC required to wait 120ms
> @@ -1028,27 +1034,39 @@ static int st7701_dsi_probe(struct mipi_dsi_device *dsi)
>   
>   	drm_panel_add(&st7701->panel);
>   
> -	mipi_dsi_set_drvdata(dsi, st7701);
> -	st7701->dsi = dsi;
> +	dev_set_drvdata(dev, st7701);
>   	st7701->desc = desc;
>   
> -	ret = mipi_dsi_attach(dsi);
> -	if (ret)
> -		goto err_attach;
> +	return devm_add_action_or_reset(dev, st7701_cleanup, st7701);
> +}
> +
> +static int st7701_dsi_probe(struct mipi_dsi_device *dsi)
> +{
> +	struct st7701 *st7701;
> +	int err;
> +
> +	err = st7701_probe(&dsi->dev, DRM_MODE_CONNECTOR_DSI);
> +	if (err)
> +		return err;
> +
> +	st7701 = dev_get_drvdata(&dsi->dev);
> +	st7701->dsi = dsi;
> +
> +	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
> +			  MIPI_DSI_MODE_LPM | MIPI_DSI_CLOCK_NON_CONTINUOUS;
> +	dsi->format = st7701->desc->format;
> +	dsi->lanes = st7701->desc->lanes;
> +
> +	err = mipi_dsi_attach(dsi);
> +	if (err)
> +		return dev_err_probe(&dsi->dev, err, "Failed to init MIPI DSI\n");
>   
>   	return 0;
> -
> -err_attach:
> -	drm_panel_remove(&st7701->panel);
> -	return ret;
>   }
>   
>   static void st7701_dsi_remove(struct mipi_dsi_device *dsi)
>   {
> -	struct st7701 *st7701 = mipi_dsi_get_drvdata(dsi);
> -
>   	mipi_dsi_detach(dsi);
> -	drm_panel_remove(&st7701->panel);
>   }
>   
>   static const struct of_device_id st7701_of_match[] = {

Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>