Re: [PATCH v3 2/9] drm/exynos: move connector creation to attach callback

Inki Dae
2018-07-24T08:04:48Z

Hi,

2018년 06월 19일 17:19에 Maciej Purski 이(가) 쓴 글:
> 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.

Right, we should consider DSI to LVDS bridge.

Thanks,
Inki Dae

>
> Signed-off-by: Maciej Purski <m.purski@samsung.com>
> ---
> drivers/gpu/drm/exynos/exynos_drm_dsi.c | 38 ++++++++++++++++++++++-----------
> 1 file changed, 25 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> index 9599e6b..c0408c0 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);
> + 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);
>
> @@ -1654,13 +1673,6 @@ 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->mic_bridge_node) {
> mic_bridge = of_drm_find_bridge(dsi->mic_bridge_node);
> if (mic_bridge)
>