diff options
| author | Dmitry Osipenko <digetx@gmail.com> | 2020-08-14 01:06:55 +0300 |
|---|---|---|
| committer | Thierry Reding <treding@nvidia.com> | 2020-09-17 13:31:00 +0300 |
| commit | 29efdc2902027e6cc19f665441a3de87a674282a (patch) | |
| tree | f80b606013b3dd2e33f5eb1e21317f3c40fa0ac0 /drivers/gpu/drm | |
| parent | f00b9dd579d0078123e33434c25f37d42747574d (diff) | |
| download | linux-29efdc2902027e6cc19f665441a3de87a674282a.tar.xz | |
drm/tegra: output: rgb: Support LVDS encoder bridge
Newer Tegra device-trees will specify a video output graph, which involves
LVDS encoder bridge. This patch adds support for the LVDS encoder bridge
to the RGB output, allowing us to model the display hardware properly.
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Diffstat (limited to 'drivers/gpu/drm')
| -rw-r--r-- | drivers/gpu/drm/tegra/rgb.c | 58 |
1 files changed, 49 insertions, 9 deletions
diff --git a/drivers/gpu/drm/tegra/rgb.c b/drivers/gpu/drm/tegra/rgb.c index 0562a7eb793f..9a7024ec96bc 100644 --- a/drivers/gpu/drm/tegra/rgb.c +++ b/drivers/gpu/drm/tegra/rgb.c @@ -7,6 +7,7 @@ #include <linux/clk.h> #include <drm/drm_atomic_helper.h> +#include <drm/drm_bridge_connector.h> #include <drm/drm_panel.h> #include <drm/drm_simple_kms_helper.h> @@ -267,24 +268,63 @@ int tegra_dc_rgb_remove(struct tegra_dc *dc) int tegra_dc_rgb_init(struct drm_device *drm, struct tegra_dc *dc) { struct tegra_output *output = dc->rgb; + struct drm_connector *connector; int err; if (!dc->rgb) return -ENODEV; - drm_connector_init(drm, &output->connector, &tegra_rgb_connector_funcs, - DRM_MODE_CONNECTOR_LVDS); - drm_connector_helper_add(&output->connector, - &tegra_rgb_connector_helper_funcs); - output->connector.dpms = DRM_MODE_DPMS_OFF; - drm_simple_encoder_init(drm, &output->encoder, DRM_MODE_ENCODER_LVDS); drm_encoder_helper_add(&output->encoder, &tegra_rgb_encoder_helper_funcs); - drm_connector_attach_encoder(&output->connector, - &output->encoder); - drm_connector_register(&output->connector); + /* + * Tegra devices that have LVDS panel utilize LVDS encoder bridge + * for converting up to 28 LCD LVTTL lanes into 5/4 LVDS lanes that + * go to display panel's receiver. + * + * Encoder usually have a power-down control which needs to be enabled + * in order to transmit data to the panel. Historically devices that + * use an older device-tree version didn't model the bridge, assuming + * that encoder is turned ON by default, while today's DRM allows us + * to model LVDS encoder properly. + * + * Newer device-trees utilize LVDS encoder bridge, which provides + * us with a connector and handles the display panel. + * + * For older device-trees we fall back to our own connector and use + * nvidia,panel phandle. + */ + if (output->bridge) { + err = drm_bridge_attach(&output->encoder, output->bridge, + NULL, DRM_BRIDGE_ATTACH_NO_CONNECTOR); + if (err) { + dev_err(output->dev, "failed to attach bridge: %d\n", + err); + return err; + } + + connector = drm_bridge_connector_init(drm, &output->encoder); + if (IS_ERR(connector)) { + dev_err(output->dev, + "failed to initialize bridge connector: %pe\n", + connector); + return PTR_ERR(connector); + } + + drm_connector_attach_encoder(connector, &output->encoder); + } else { + drm_connector_init(drm, &output->connector, + &tegra_rgb_connector_funcs, + DRM_MODE_CONNECTOR_LVDS); + drm_connector_helper_add(&output->connector, + &tegra_rgb_connector_helper_funcs); + output->connector.dpms = DRM_MODE_DPMS_OFF; + + drm_connector_attach_encoder(&output->connector, + &output->encoder); + drm_connector_register(&output->connector); + } err = tegra_output_init(drm, output); if (err < 0) { |