Re: [PATCH v5 2/9] drm/exynos: move connector creation to attach callback

[Andrzej Hajda <a.hajda@samsung.com>]

On 07.08.2018 10:53, Inki Dae wrote:
>
> 2018년 07월 26일 00:46에 Andrzej Hajda 이(가) 쓴 글:
>> From: Maciej Purski <m.purski@samsung.com>
>>
>> The current implementation assumes that the only possible peripheral
>> device for DSIM is a panel. Using an output bridge child device
>> should also be possible.
>>
>> If an output bridge is available, don't create a new connector.
>> Instead, call drm_bridge_attach() and set encoder's bridge to NULL
>> in order to avoid an out bridge from being visible by the framework, as
>> the DSI bus needs control on enabling its child output bridge.
>>
>> Such sequence is required by Toshiba TC358764 bridge, which is a DSI
>> peripheral bridge device.
>>
>> changed in v5:
>> - detach bridge in mipi_dsi detach callback
>>
>> Signed-off-by: Maciej Purski <m.purski@samsung.com>
>> [ a.hajda@samsung.com: v5 ]
>> Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
>> ---
>>  drivers/gpu/drm/exynos/exynos_drm_dsi.c | 50 ++++++++++++++++---------
>>  1 file changed, 32 insertions(+), 18 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
>> index 351403f9d245..f5f51f584fa0 100644
>> --- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
>> +++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
>> @@ -255,6 +255,7 @@ struct exynos_dsi {
>>  	struct mipi_dsi_host dsi_host;
>>  	struct drm_connector connector;
>>  	struct drm_panel *panel;
>> +	struct drm_bridge *out_bridge;
>>  	struct device *dev;
>>  
>>  	void __iomem *reg_base;
>> @@ -1499,7 +1500,30 @@ static int exynos_dsi_host_attach(struct mipi_dsi_host *host,
>>  				  struct mipi_dsi_device *device)
>>  {
>>  	struct exynos_dsi *dsi = host_to_dsi(host);
>> -	struct drm_device *drm = dsi->connector.dev;
>> +	struct drm_encoder *encoder = &dsi->encoder;
>> +	struct drm_device *drm = encoder->dev;
>> +	struct drm_bridge *out_bridge;
>> +
>> +	out_bridge  = of_drm_find_bridge(device->dev.of_node);
> Is there any reason to find out_bridge without considering device tree graph binding?

If the sink is a child MIPI-DSI device, the bindings can be omitted, as
in case of all DSI panels in Exynos platforms.
In case bindings are not present you cannot use graph functions.

>
> Then, you embedded bridge device node in dsi device node[1] but the binding document below doesn't mention about this,
> Documentation/devicetree/bindings/display/exynos/exynos_dsim.txt

But this document says about child nodes, and Toshiba bridge is MIPI-DSI
child [1].

Regards
Andrzej

>
> [1] https://lkml.org/lkml/2018/6/19/237
>
> Thanks,
> Inki Dae
>
>> +	if (out_bridge) {
>> +		drm_bridge_attach(encoder, out_bridge, NULL);
>> +		dsi->out_bridge = out_bridge;
>> +		encoder->bridge = NULL;
>> +	} else {
>> +		int ret = exynos_dsi_create_connector(encoder);
>> +
>> +		if (ret) {
>> +			DRM_ERROR("failed to create connector ret = %d\n", ret);
>> +			drm_encoder_cleanup(encoder);
>> +			return ret;
>> +		}
>> +
>> +		dsi->panel = of_drm_find_panel(device->dev.of_node);
>> +		if (dsi->panel) {
>> +			drm_panel_attach(dsi->panel, &dsi->connector);
>> +			dsi->connector.status = connector_status_connected;
>> +		}
>> +	}
>>  
>>  	/*
>>  	 * This is a temporary solution and should be made by more generic way.
>> @@ -1518,11 +1542,6 @@ static int exynos_dsi_host_attach(struct mipi_dsi_host *host,
>>  	dsi->lanes = device->lanes;
>>  	dsi->format = device->format;
>>  	dsi->mode_flags = device->mode_flags;
>> -	dsi->panel = of_drm_find_panel(device->dev.of_node);
>> -	if (dsi->panel) {
>> -		drm_panel_attach(dsi->panel, &dsi->connector);
>> -		dsi->connector.status = connector_status_connected;
>> -	}
>>  	exynos_drm_crtc_get_by_type(drm, EXYNOS_DISPLAY_TYPE_LCD)->i80_mode =
>>  			!(dsi->mode_flags & MIPI_DSI_MODE_VIDEO);
>>  
>> @@ -1538,19 +1557,21 @@ static int exynos_dsi_host_detach(struct mipi_dsi_host *host,
>>  				  struct mipi_dsi_device *device)
>>  {
>>  	struct exynos_dsi *dsi = host_to_dsi(host);
>> -	struct drm_device *drm = dsi->connector.dev;
>> -
>> -	mutex_lock(&drm->mode_config.mutex);
>> +	struct drm_device *drm = dsi->encoder.dev;
>>  
>>  	if (dsi->panel) {
>> +		mutex_lock(&drm->mode_config.mutex);
>>  		exynos_dsi_disable(&dsi->encoder);
>>  		drm_panel_detach(dsi->panel);
>>  		dsi->panel = NULL;
>>  		dsi->connector.status = connector_status_disconnected;
>> +		mutex_unlock(&drm->mode_config.mutex);
>> +	} else {
>> +		if (dsi->out_bridge->funcs->detach)
>> +			dsi->out_bridge->funcs->detach(dsi->out_bridge);
>> +		dsi->out_bridge = NULL;
>>  	}
>>  
>> -	mutex_unlock(&drm->mode_config.mutex);
>> -
>>  	if (drm->mode_config.poll_enabled)
>>  		drm_kms_helper_hotplug_event(drm);
>>  
>> @@ -1654,13 +1675,6 @@ static int exynos_dsi_bind(struct device *dev, struct device *master,
>>  	if (ret < 0)
>>  		return ret;
>>  
>> -	ret = exynos_dsi_create_connector(encoder);
>> -	if (ret) {
>> -		DRM_ERROR("failed to create connector ret = %d\n", ret);
>> -		drm_encoder_cleanup(encoder);
>> -		return ret;
>> -	}
>> -
>>  	if (dsi->in_bridge_node) {
>>  		in_bridge = of_drm_find_bridge(dsi->in_bridge_node);
>>  		if (in_bridge)
>>
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