On 07.08.2018 10:53, Inki Dae wrote:
>
> 2018년 07월 26일 00:46에 Andrzej Hajda 이(가) 쓴 글:
>> From: Maciej Purski <m.pur...@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.pur...@samsung.com>
>> [ a.ha...@samsung.com: v5 ]
>> Signed-off-by: Andrzej Hajda <a.ha...@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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