Commit 31f62079 authored by Marek Vasut's avatar Marek Vasut Committed by Sam Ravnborg

drm/bridge: lvds-codec: Add support for LVDS data mapping select

Decoder input LVDS format is a property of the decoder chip or even
its strapping. Handle data-mapping the same way lvds-panel does. In
case data-mapping is not present, do nothing, since there are still
legacy bindings which do not specify this property.
Signed-off-by: default avatarMarek Vasut <marex@denx.de>
Reviewed-by: default avatarLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: default avatarSam Ravnborg <sam@ravnborg.org>
To: dri-devel@lists.freedesktop.org
Signed-off-by: default avatarSam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20211010144919.38392-2-marex@denx.de
parent ba3e8678
......@@ -12,6 +12,7 @@
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_panel.h>
......@@ -22,6 +23,7 @@ struct lvds_codec {
struct regulator *vcc;
struct gpio_desc *powerdown_gpio;
u32 connector_type;
unsigned int bus_format;
};
static inline struct lvds_codec *to_lvds_codec(struct drm_bridge *bridge)
......@@ -74,12 +76,50 @@ static const struct drm_bridge_funcs funcs = {
.disable = lvds_codec_disable,
};
#define MAX_INPUT_SEL_FORMATS 1
static u32 *
lvds_codec_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
struct drm_bridge_state *bridge_state,
struct drm_crtc_state *crtc_state,
struct drm_connector_state *conn_state,
u32 output_fmt,
unsigned int *num_input_fmts)
{
struct lvds_codec *lvds_codec = to_lvds_codec(bridge);
u32 *input_fmts;
*num_input_fmts = 0;
input_fmts = kcalloc(MAX_INPUT_SEL_FORMATS, sizeof(*input_fmts),
GFP_KERNEL);
if (!input_fmts)
return NULL;
input_fmts[0] = lvds_codec->bus_format;
*num_input_fmts = MAX_INPUT_SEL_FORMATS;
return input_fmts;
}
static const struct drm_bridge_funcs funcs_decoder = {
.attach = lvds_codec_attach,
.enable = lvds_codec_enable,
.disable = lvds_codec_disable,
.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
.atomic_reset = drm_atomic_helper_bridge_reset,
.atomic_get_input_bus_fmts = lvds_codec_atomic_get_input_bus_fmts,
};
static int lvds_codec_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *panel_node;
struct device_node *bus_node;
struct drm_panel *panel;
struct lvds_codec *lvds_codec;
const char *mapping;
int ret;
lvds_codec = devm_kzalloc(dev, sizeof(*lvds_codec), GFP_KERNEL);
if (!lvds_codec)
......@@ -119,13 +159,47 @@ static int lvds_codec_probe(struct platform_device *pdev)
if (IS_ERR(lvds_codec->panel_bridge))
return PTR_ERR(lvds_codec->panel_bridge);
lvds_codec->bridge.funcs = &funcs;
/*
* Decoder input LVDS format is a property of the decoder chip or even
* its strapping. Handle data-mapping the same way lvds-panel does. In
* case data-mapping is not present, do nothing, since there are still
* legacy bindings which do not specify this property.
*/
if (lvds_codec->connector_type != DRM_MODE_CONNECTOR_LVDS) {
bus_node = of_graph_get_endpoint_by_regs(dev->of_node, 0, 0);
if (!bus_node) {
dev_dbg(dev, "bus DT node not found\n");
return -ENXIO;
}
ret = of_property_read_string(bus_node, "data-mapping",
&mapping);
of_node_put(bus_node);
if (ret < 0) {
dev_warn(dev, "missing 'data-mapping' DT property\n");
} else {
if (!strcmp(mapping, "jeida-18")) {
lvds_codec->bus_format = MEDIA_BUS_FMT_RGB666_1X7X3_SPWG;
} else if (!strcmp(mapping, "jeida-24")) {
lvds_codec->bus_format = MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA;
} else if (!strcmp(mapping, "vesa-24")) {
lvds_codec->bus_format = MEDIA_BUS_FMT_RGB888_1X7X4_SPWG;
} else {
dev_err(dev, "invalid 'data-mapping' DT property\n");
return -EINVAL;
}
lvds_codec->bridge.funcs = &funcs_decoder;
}
}
/*
* 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.funcs = &funcs;
drm_bridge_add(&lvds_codec->bridge);
platform_set_drvdata(pdev, lvds_codec);
......
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