diff options
| author |   Marek Vasut <marex@denx.de> | 2021-10-17 02:12:04 +0200 |
|---|---|---|
| committer |   Thomas Zimmermann <tzimmermann@suse.de> | 2021-12-16 09:37:41 +0100 |
| commit | 88438668c9e0e32220b4605610bd888b4e50fe80 (patch) | |
| tree | aa3e13d5b5ad95b1f7a7a7eb3c1624fde5dcc41e /drivers/gpu/drm/bridge | |
| parent | dt-bindings: display: bridge: lvds-codec: Document pixel data sampling edge select (diff) | |
| download | linux-dev-88438668c9e0e32220b4605610bd888b4e50fe80.tar.xz linux-dev-88438668c9e0e32220b4605610bd888b4e50fe80.zip | |
drm/bridge: lvds-codec: Add support for pixel data sampling edge select
The OnSemi FIN3385 Parallel-to-LVDS encoder has a dedicated input line to
select input pixel data sampling edge. Add DT property "pclk-sample", not
the same as the one used by display timings but rather the same as used by
media, and configure bus flags based on this DT property.
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: devicetree@vger.kernel.org
To: dri-devel@lists.freedesktop.org
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20211017001204.299940-2-marex@denx.de
Diffstat (limited to 'drivers/gpu/drm/bridge')
| -rw-r--r-- | drivers/gpu/drm/bridge/lvds-codec.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/gpu/drm/bridge/lvds-codec.c b/drivers/gpu/drm/bridge/lvds-codec.c index f991842a161f..702ea803a743 100644 --- a/drivers/gpu/drm/bridge/lvds-codec.c +++ b/drivers/gpu/drm/bridge/lvds-codec.c @@ -21,6 +21,7 @@ struct lvds_codec { struct device *dev; struct drm_bridge bridge; struct drm_bridge *panel_bridge; + struct drm_bridge_timings timings; struct regulator *vcc; struct gpio_desc *powerdown_gpio; u32 connector_type; @@ -119,6 +120,7 @@ static int lvds_codec_probe(struct platform_device *pdev) struct device_node *bus_node; struct drm_panel *panel; struct lvds_codec *lvds_codec; + u32 val; int ret; lvds_codec = devm_kzalloc(dev, sizeof(*lvds_codec), GFP_KERNEL); @@ -188,11 +190,24 @@ static int lvds_codec_probe(struct platform_device *pdev) } /* + * Encoder might sample data on different clock edge than the display, + * for example OnSemi FIN3385 has a dedicated strapping pin to select + * the sampling edge. + */ + if (lvds_codec->connector_type == DRM_MODE_CONNECTOR_LVDS && + !of_property_read_u32(dev->of_node, "pclk-sample", &val)) { + lvds_codec->timings.input_bus_flags = val ? + DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE : + DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE; + } + + /* * The panel_bridge bridge is attached to the panel's of_node, * but we need a bridge attached to our of_node for our user * to look up. */ lvds_codec->bridge.of_node = dev->of_node; + lvds_codec->bridge.timings = &lvds_codec->timings; drm_bridge_add(&lvds_codec->bridge); platform_set_drvdata(pdev, lvds_codec); |