On Fri, 25 Apr 2025 at 00:00, Abhinav Kumar <quic_abhin...@quicinc.com> wrote:
>
>
>
> On 4/24/2025 3:23 AM, Dmitry Baryshkov wrote:
> > On Wed, Apr 23, 2025 at 07:04:16PM -0700, Abhinav Kumar wrote:
> >>
> >>
> >> On 2/26/2025 6:25 PM, Dmitry Baryshkov wrote:
> >>> LVDS support in MDP4 driver makes use of drm_connector directly. However
> >>> LCDC encoder and LVDS connector are wrappers around drm_panel. Switch
> >>> them to use drm_panel_bridge/drm_bridge_connector. This allows using
> >>> standard interface for the drm_panel and also inserting additional
> >>> bridges between encoder and panel.
> >>>
> >>> Signed-off-by: Dmitry Baryshkov <dmitry.barysh...@linaro.org>
> >>> ---
> >>> drivers/gpu/drm/msm/Makefile | 1 -
> >>> drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.c | 34 +++++--
> >>> drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.h | 6 +-
> >>> drivers/gpu/drm/msm/disp/mdp4/mdp4_lcdc_encoder.c | 20 +----
> >>> .../gpu/drm/msm/disp/mdp4/mdp4_lvds_connector.c | 100
> >>> ---------------------
> >>> 5 files changed, 28 insertions(+), 133 deletions(-)
> >>>
> >>> @@ -199,27 +201,43 @@ static int mdp4_modeset_init_intf(struct mdp4_kms
> >>> *mdp4_kms,
> >>> * bail out early if there is no panel node (no need to
> >>> * initialize LCDC encoder and LVDS connector)
> >>> */
> >>> - panel_node = of_graph_get_remote_node(dev->dev->of_node, 0,
> >>> 0);
> >>> - if (!panel_node)
> >>> - return 0;
> >>> + next_bridge = devm_drm_of_get_bridge(dev->dev,
> >>> dev->dev->of_node, 0, 0);
> >>> + if (IS_ERR(next_bridge)) {
> >>> + ret = PTR_ERR(next_bridge);
> >>> + if (ret == -ENODEV)
> >>> + return 0;
> >>> + return ret;
> >>> + }
> >>> - encoder = mdp4_lcdc_encoder_init(dev, panel_node);
> >>> + encoder = mdp4_lcdc_encoder_init(dev);
> >>> if (IS_ERR(encoder)) {
> >>> DRM_DEV_ERROR(dev->dev, "failed to construct LCDC
> >>> encoder\n");
> >>> - of_node_put(panel_node);
> >>> return PTR_ERR(encoder);
> >>> }
> >>> /* LCDC can be hooked to DMA_P (TODO: Add DMA_S later?) */
> >>> encoder->possible_crtcs = 1 << DMA_P;
> >>> - connector = mdp4_lvds_connector_init(dev, panel_node,
> >>> encoder);
> >>> + ret = drm_bridge_attach(encoder, next_bridge, NULL,
> >>> DRM_BRIDGE_ATTACH_NO_CONNECTOR);
> >>> + if (ret) {
> >>> + DRM_DEV_ERROR(dev->dev, "failed to attach LVDS
> >>> panel/bridge: %d\n", ret);
> >>> +
> >>> + return ret;
> >>> + }
> >>
> >> Can you pls point me to the lvds bridge used with this apq8064 board? I was
> >> unable to find it. Just wanted to compare that against this while
> >> reviewing.
> >
> > It's the panel bridge, wrapping one of the LVDS panels.
> >
>
> Yes but what I wanted to check was which LVDS panel was being used so
> far. Looks like for arm32 the dts is missing? As I couldnt find the lvds
> out endpoint. So can you pls point me to the lvds panel you verified
> this with?
I used the AUO b101xtn01 panel connected to the LVDS connector on the
IFC6410. I'm not posting DT bits since the panel is not a part of the
kit.
>
>
> >>> +
> >>> + connector = drm_bridge_connector_init(dev, encoder);
> >>> if (IS_ERR(connector)) {
> >>> DRM_DEV_ERROR(dev->dev, "failed to initialize LVDS
> >>> connector\n");
> >>> - of_node_put(panel_node);
> >>> return PTR_ERR(connector);
> >>> }
> >>> + ret = drm_connector_attach_encoder(connector, encoder);
> >>> + if (ret) {
> >>> + DRM_DEV_ERROR(dev->dev, "failed to attach LVDS
> >>> connector: %d\n", ret);
> >>> +
> >>> + return ret;
> >>> + }
> >>> +
> >>> break;
> >>> case DRM_MODE_ENCODER_TMDS:
> >>> encoder = mdp4_dtv_encoder_init(dev);
> >
>
--
With best wishes
Dmitry
