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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>
This commit is contained in:
Dmitry Osipenko 2020-08-14 01:06:55 +03:00 committed by Thierry Reding
parent f00b9dd579
commit 29efdc2902
1 changed files with 49 additions and 9 deletions
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58
drivers/gpu/drm/tegra/rgb.c
View File

@ -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) {