Two issues:

1> Intializing panel specific bits without actual panel presence. 2> Bailing out if the detect_panel() return -ENODEV.

With the existing code if detect_panel() returns an error code the driver would bail out without doing anything, However it could continue intializing hdmi related things. This patch adds two things.

1> moves the panel specific intialization only if the panel is detected 2> let the driver continue with hdmi intialization if detect_panel() return -ENODEV.

Signed-off-by: Srinivas Kandagatla srinivas.kandagatla@linaro.org --- drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c | 72 +++++++++++++++++++-------------- 1 file changed, 41 insertions(+), 31 deletions(-)

diff --git a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c index 601dcc0..ad02b8b 100644 --- a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c +++ b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c @@ -313,45 +313,55 @@ static int modeset_init(struct mdp4_kms *mdp4_kms) if (IS_ERR(panel)) { ret = PTR_ERR(panel); dev_err(dev->dev, "failed to detect LVDS panel: %d\n", ret); - goto fail; - } + /** + * Only fail if there is panel but not ready yet + * continue with other stuff if there is no panel connected. + */ + if (ret == -EPROBE_DEFER) + goto fail; + } else { + plane = mdp4_plane_init(dev, RGB2, true); + if (IS_ERR(plane)) { + dev_err(dev->dev, + "failed to construct plane for RGB2\n"); + ret = PTR_ERR(plane); + goto fail; + }

- plane = mdp4_plane_init(dev, RGB2, true); - if (IS_ERR(plane)) { - dev_err(dev->dev, "failed to construct plane for RGB2\n"); - ret = PTR_ERR(plane); - goto fail; - } + crtc = mdp4_crtc_init(dev, plane, priv->num_crtcs, 0, DMA_P); + if (IS_ERR(crtc)) { + dev_err(dev->dev, + "failed to construct crtc for DMA_P\n"); + ret = PTR_ERR(crtc); + goto fail; + }

- crtc = mdp4_crtc_init(dev, plane, priv->num_crtcs, 0, DMA_P); - if (IS_ERR(crtc)) { - dev_err(dev->dev, "failed to construct crtc for DMA_P\n"); - ret = PTR_ERR(crtc); - goto fail; - } + encoder = mdp4_lcdc_encoder_init(dev, panel); + if (IS_ERR(encoder)) { + dev_err(dev->dev, + "failed to construct LCDC encoder\n"); + ret = PTR_ERR(encoder); + goto fail; + }

- encoder = mdp4_lcdc_encoder_init(dev, panel); - if (IS_ERR(encoder)) { - dev_err(dev->dev, "failed to construct LCDC encoder\n"); - ret = PTR_ERR(encoder); - goto fail; - } + /* LCDC can be hooked to DMA_P: */ + encoder->possible_crtcs = 1 << priv->num_crtcs;

- /* LCDC can be hooked to DMA_P: */ - encoder->possible_crtcs = 1 << priv->num_crtcs; + priv->crtcs[priv->num_crtcs++] = crtc; + priv->encoders[priv->num_encoders++] = encoder;

- priv->crtcs[priv->num_crtcs++] = crtc; - priv->encoders[priv->num_encoders++] = encoder; + connector = mdp4_lvds_connector_init(dev, panel, encoder); + if (IS_ERR(connector)) { + ret = PTR_ERR(connector); + dev_err(dev->dev, + "failed to initialize LVDS connector: %d\n", + ret); + goto fail; + }

- connector = mdp4_lvds_connector_init(dev, panel, encoder); - if (IS_ERR(connector)) { - ret = PTR_ERR(connector); - dev_err(dev->dev, "failed to initialize LVDS connector: %d\n", ret); - goto fail; + priv->connectors[priv->num_connectors++] = connector; }

- priv->connectors[priv->num_connectors++] = connector; - /* * Setup DTV/HDMI path: RGB1 -> DMA_E -> DTV -> HDMI: */