Hi,
Am Montag, 24. Juni 2024, 12:31:46 CEST schrieb Dmitry Baryshkov:
> Existing in-kernel device trees use LCDIF with the dsim + adv7533, dsim
> + tc358762 or with ldb + panel_bridge. All these combinations support
> using DRM_BRIDGE_ATTACH_NO_CONNECTOR for bridge attachment.
>
> Change lcdif driver to use this flag when attaching the bridge and
> create drm_bridge_connector afterwards.
>
> Signed-off-by: Dmitry Baryshkov <dmitry.barysh...@linaro.org>
> ---
> Note: compile-tested only.
I gave it a try, but it doesn't work. Despite DSI output it also breaks
HDMI output, where I at least some error messages:
[drm:drm_bridge_attach] *ERROR* failed to attach bridge
/soc@0/bus@32c00000/hdmi@32fd8000 to encoder None-37: -22
[drm:drm_bridge_attach] *ERROR* failed to attach bridge
/soc@0/bus@32c00000/display-bridge@32fc4000 to encoder None-37: -22
imx-lcdif 32fc6000.display-controller: error -EINVAL: Failed to attach bridge
for endpoint0
imx-lcdif 32fc6000.display-controller: error -EINVAL: Cannot connect bridge
imx-lcdif 32fc6000.display-controller: probe with driver imx-lcdif failed with
error -22
Best regards,
Alexander
> ---
> drivers/gpu/drm/mxsfb/lcdif_drv.c | 14 +++++++++++++-
> 1 file changed, 13 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/mxsfb/lcdif_drv.c
> b/drivers/gpu/drm/mxsfb/lcdif_drv.c
> index 0f895b8a99d6..1d5508449995 100644
> --- a/drivers/gpu/drm/mxsfb/lcdif_drv.c
> +++ b/drivers/gpu/drm/mxsfb/lcdif_drv.c
> @@ -16,6 +16,7 @@
>
> #include <drm/drm_atomic_helper.h>
> #include <drm/drm_bridge.h>
> +#include <drm/drm_bridge_connector.h>
> #include <drm/drm_drv.h>
> #include <drm/drm_encoder.h>
> #include <drm/drm_fbdev_dma.h>
> @@ -48,6 +49,7 @@ static int lcdif_attach_bridge(struct lcdif_drm_private
> *lcdif)
> {
> struct device *dev = lcdif->drm->dev;
> struct device_node *ep;
> + struct drm_connector *connector;
> struct drm_bridge *bridge;
> int ret;
>
> @@ -96,13 +98,23 @@ static int lcdif_attach_bridge(struct lcdif_drm_private
> *lcdif)
> return ret;
> }
>
> - ret = drm_bridge_attach(encoder, bridge, NULL, 0);
> + ret = drm_bridge_attach(encoder, bridge, NULL,
> DRM_BRIDGE_ATTACH_NO_CONNECTOR);
> if (ret) {
> of_node_put(ep);
> return dev_err_probe(dev, ret,
> "Failed to attach bridge for
> endpoint%u\n",
> of_ep.id);
> }
> +
> + connector = drm_bridge_connector_init(lcdif->drm, encoder);
> + if (IS_ERR(connector)) {
> + ret = PTR_ERR(connector);
> + of_node_put(ep);
> +
> + return dev_err_probe(dev, ret,
> + "Failed to create bridge connector
> for endpoint%u\n",
> + of_ep.id);
> + }
> }
>
> return 0;
>
> ---
> base-commit: f76698bd9a8ca01d3581236082d786e9a6b72bb7
> change-id: 20240624-mxc-lcdif-bridge-attach-60368807b2f9
>
> Best regards,
>
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