diff --git a/drivers/gpu/drm/bridge/imx/Kconfig b/drivers/gpu/drm/bridge/imx/Kconfig
index 53001650a61a9c6cd68ce46a23db716345b1a0e0..f33d67be54dc23a1c4fa17710d780f4e8b32db60 100644
--- a/drivers/gpu/drm/bridge/imx/Kconfig
+++ b/drivers/gpu/drm/bridge/imx/Kconfig
@@ -1,3 +1,12 @@
+config DRM_IMX8QXP_LDB
+ tristate "Freescale i.MX8QXP LVDS display bridge"
+ depends on OF
+ depends on COMMON_CLK
+ select DRM_KMS_HELPER
+ help
+ Choose this to enable the internal LVDS Display Bridge(LDB) found in
+ Freescale i.MX8qxp processor. Official name of LDB is pixel mapper.
+
config DRM_IMX8QXP_PIXEL_COMBINER
tristate "Freescale i.MX8QM/QXP pixel combiner"
depends on OF
diff --git a/drivers/gpu/drm/bridge/imx/Makefile b/drivers/gpu/drm/bridge/imx/Makefile
index e74dd6422e95c2420a087bc7086b811255e3deb2..96d5d1e9659d833ca7840ee744bdddb1a937c5ff 100644
--- a/drivers/gpu/drm/bridge/imx/Makefile
+++ b/drivers/gpu/drm/bridge/imx/Makefile
@@ -1,3 +1,6 @@
+imx8qxp-ldb-objs := imx-ldb-helper.o imx8qxp-ldb-drv.o
+obj-$(CONFIG_DRM_IMX8QXP_LDB) += imx8qxp-ldb.o
+
obj-$(CONFIG_DRM_IMX8QXP_PIXEL_COMBINER) += imx8qxp-pixel-combiner.o
obj-$(CONFIG_DRM_IMX8QXP_PIXEL_LINK) += imx8qxp-pixel-link.o
obj-$(CONFIG_DRM_IMX8QXP_PIXEL_LINK_TO_DPI) += imx8qxp-pxl2dpi.o
diff --git a/drivers/gpu/drm/bridge/imx/imx8qxp-ldb-drv.c b/drivers/gpu/drm/bridge/imx/imx8qxp-ldb-drv.c
new file mode 100644
index 0000000000000000000000000000000000000000..1cca5fc96a4b7cc9c8526616b0588d26b9edd209
--- /dev/null
+++ b/drivers/gpu/drm/bridge/imx/imx8qxp-ldb-drv.c
@@ -0,0 +1,722 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/*
+ * Copyright 2020 NXP
+ */
+
+#include <linux/clk.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_graph.h>
+#include <linux/phy/phy.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+
+#include <drm/drm_atomic_state_helper.h>
+#include <drm/drm_bridge.h>
+#include <drm/drm_connector.h>
+#include <drm/drm_fourcc.h>
+#include <drm/drm_of.h>
+#include <drm/drm_print.h>
+
+#include "imx-ldb-helper.h"
+
+#define LDB_CH_SEL BIT(28)
+
+#define SS_CTRL 0x20
+#define CH_HSYNC_M(id) BIT(0 + ((id) * 2))
+#define CH_VSYNC_M(id) BIT(1 + ((id) * 2))
+#define CH_PHSYNC(id) BIT(0 + ((id) * 2))
+#define CH_PVSYNC(id) BIT(1 + ((id) * 2))
+
+#define DRIVER_NAME "imx8qxp-ldb"
+
+struct imx8qxp_ldb_channel {
+ struct ldb_channel base;
+ struct phy *phy;
+ unsigned int di_id;
+};
+
+struct imx8qxp_ldb {
+ struct ldb base;
+ struct device *dev;
+ struct imx8qxp_ldb_channel channel[MAX_LDB_CHAN_NUM];
+ struct clk *clk_pixel;
+ struct clk *clk_bypass;
+ struct drm_bridge *companion;
+ int active_chno;
+};
+
+static inline struct imx8qxp_ldb_channel *
+base_to_imx8qxp_ldb_channel(struct ldb_channel *base)
+{
+ return container_of(base, struct imx8qxp_ldb_channel, base);
+}
+
+static inline struct imx8qxp_ldb *base_to_imx8qxp_ldb(struct ldb *base)
+{
+ return container_of(base, struct imx8qxp_ldb, base);
+}
+
+static void imx8qxp_ldb_set_phy_cfg(struct imx8qxp_ldb *imx8qxp_ldb,
+ unsigned long di_clk, bool is_split,
+ struct phy_configure_opts_lvds *phy_cfg)
+{
+ phy_cfg->bits_per_lane_and_dclk_cycle = 7;
+ phy_cfg->lanes = 4;
+
+ if (is_split) {
+ phy_cfg->differential_clk_rate = di_clk / 2;
+ phy_cfg->is_slave = !imx8qxp_ldb->companion;
+ } else {
+ phy_cfg->differential_clk_rate = di_clk;
+ phy_cfg->is_slave = false;
+ }
+}
+
+static int
+imx8qxp_ldb_bridge_atomic_check(struct drm_bridge *bridge,
+ struct drm_bridge_state *bridge_state,
+ struct drm_crtc_state *crtc_state,
+ struct drm_connector_state *conn_state)
+{
+ struct ldb_channel *ldb_ch = bridge->driver_private;
+ struct ldb *ldb = ldb_ch->ldb;
+ struct imx8qxp_ldb_channel *imx8qxp_ldb_ch =
+ base_to_imx8qxp_ldb_channel(ldb_ch);
+ struct imx8qxp_ldb *imx8qxp_ldb = base_to_imx8qxp_ldb(ldb);
+ struct drm_bridge *companion = imx8qxp_ldb->companion;
+ struct drm_display_mode *adj = &crtc_state->adjusted_mode;
+ unsigned long di_clk = adj->clock * 1000;
+ bool is_split = ldb_channel_is_split_link(ldb_ch);
+ union phy_configure_opts opts = { };
+ struct phy_configure_opts_lvds *phy_cfg = &opts.lvds;
+ int ret;
+
+ ret = ldb_bridge_atomic_check_helper(bridge, bridge_state,
+ crtc_state, conn_state);
+ if (ret)
+ return ret;
+
+ imx8qxp_ldb_set_phy_cfg(imx8qxp_ldb, di_clk, is_split, phy_cfg);
+ ret = phy_validate(imx8qxp_ldb_ch->phy, PHY_MODE_LVDS, 0, &opts);
+ if (ret < 0) {
+ DRM_DEV_DEBUG_DRIVER(imx8qxp_ldb->dev,
+ "failed to validate PHY: %d\n", ret);
+ return ret;
+ }
+
+ if (is_split && companion) {
+ ret = companion->funcs->atomic_check(companion,
+ bridge_state, crtc_state, conn_state);
+ if (ret)
+ return ret;
+ }
+
+ return ret;
+}
+
+static void
+imx8qxp_ldb_bridge_mode_set(struct drm_bridge *bridge,
+ const struct drm_display_mode *mode,
+ const struct drm_display_mode *adjusted_mode)
+{
+ struct ldb_channel *ldb_ch = bridge->driver_private;
+ struct ldb_channel *companion_ldb_ch;
+ struct ldb *ldb = ldb_ch->ldb;
+ struct imx8qxp_ldb_channel *imx8qxp_ldb_ch =
+ base_to_imx8qxp_ldb_channel(ldb_ch);
+ struct imx8qxp_ldb *imx8qxp_ldb = base_to_imx8qxp_ldb(ldb);
+ struct drm_bridge *companion = imx8qxp_ldb->companion;
+ struct device *dev = imx8qxp_ldb->dev;
+ unsigned long di_clk = adjusted_mode->clock * 1000;
+ bool is_split = ldb_channel_is_split_link(ldb_ch);
+ union phy_configure_opts opts = { };
+ struct phy_configure_opts_lvds *phy_cfg = &opts.lvds;
+ u32 chno = ldb_ch->chno;
+ int ret;
+
+ ret = pm_runtime_get_sync(dev);
+ if (ret < 0)
+ DRM_DEV_ERROR(dev, "failed to get runtime PM sync: %d\n", ret);
+
+ ret = phy_init(imx8qxp_ldb_ch->phy);
+ if (ret < 0)
+ DRM_DEV_ERROR(dev, "failed to initialize PHY: %d\n", ret);
+
+ ret = phy_set_mode(imx8qxp_ldb_ch->phy, PHY_MODE_LVDS);
+ if (ret < 0)
+ DRM_DEV_ERROR(dev, "failed to set PHY mode: %d\n", ret);
+
+ if (is_split && companion) {
+ companion_ldb_ch = bridge_to_ldb_ch(companion);
+
+ companion_ldb_ch->in_bus_format = ldb_ch->in_bus_format;
+ companion_ldb_ch->out_bus_format = ldb_ch->out_bus_format;
+ }
+
+ clk_set_rate(imx8qxp_ldb->clk_bypass, di_clk);
+ clk_set_rate(imx8qxp_ldb->clk_pixel, di_clk);
+
+ imx8qxp_ldb_set_phy_cfg(imx8qxp_ldb, di_clk, is_split, phy_cfg);
+ ret = phy_configure(imx8qxp_ldb_ch->phy, &opts);
+ if (ret < 0)
+ DRM_DEV_ERROR(dev, "failed to configure PHY: %d\n", ret);
+
+ if (chno == 0)
+ ldb->ldb_ctrl &= ~LDB_CH_SEL;
+ else
+ ldb->ldb_ctrl |= LDB_CH_SEL;
+
+ /* input VSYNC signal from pixel link is active low */
+ if (imx8qxp_ldb_ch->di_id == 0)
+ ldb->ldb_ctrl |= LDB_DI0_VS_POL_ACT_LOW;
+ else
+ ldb->ldb_ctrl |= LDB_DI1_VS_POL_ACT_LOW;
+
+ /*
+ * For split mode, settle input VSYNC signal polarity and
+ * channel selection down early.
+ */
+ if (is_split)
+ regmap_write(ldb->regmap, ldb->ctrl_reg, ldb->ldb_ctrl);
+
+ ldb_bridge_mode_set_helper(bridge, mode, adjusted_mode);
+
+ if (adjusted_mode->flags & DRM_MODE_FLAG_NVSYNC)
+ regmap_update_bits(ldb->regmap, SS_CTRL, CH_VSYNC_M(chno), 0);
+ else if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
+ regmap_update_bits(ldb->regmap, SS_CTRL,
+ CH_VSYNC_M(chno), CH_PVSYNC(chno));
+
+ if (adjusted_mode->flags & DRM_MODE_FLAG_NHSYNC)
+ regmap_update_bits(ldb->regmap, SS_CTRL, CH_HSYNC_M(chno), 0);
+ else if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
+ regmap_update_bits(ldb->regmap, SS_CTRL,
+ CH_HSYNC_M(chno), CH_PHSYNC(chno));
+
+ if (is_split && companion)
+ companion->funcs->mode_set(companion, mode, adjusted_mode);
+}
+
+static void
+imx8qxp_ldb_bridge_atomic_pre_enable(struct drm_bridge *bridge,
+ struct drm_bridge_state *old_bridge_state)
+{
+ struct ldb_channel *ldb_ch = bridge->driver_private;
+ struct ldb *ldb = ldb_ch->ldb;
+ struct imx8qxp_ldb *imx8qxp_ldb = base_to_imx8qxp_ldb(ldb);
+ struct drm_bridge *companion = imx8qxp_ldb->companion;
+ bool is_split = ldb_channel_is_split_link(ldb_ch);
+
+ clk_prepare_enable(imx8qxp_ldb->clk_pixel);
+ clk_prepare_enable(imx8qxp_ldb->clk_bypass);
+
+ if (is_split && companion)
+ companion->funcs->atomic_pre_enable(companion, old_bridge_state);
+}
+
+static void
+imx8qxp_ldb_bridge_atomic_enable(struct drm_bridge *bridge,
+ struct drm_bridge_state *old_bridge_state)
+{
+ struct ldb_channel *ldb_ch = bridge->driver_private;
+ struct ldb *ldb = ldb_ch->ldb;
+ struct imx8qxp_ldb_channel *imx8qxp_ldb_ch =
+ base_to_imx8qxp_ldb_channel(ldb_ch);
+ struct imx8qxp_ldb *imx8qxp_ldb = base_to_imx8qxp_ldb(ldb);
+ struct drm_bridge *companion = imx8qxp_ldb->companion;
+ struct device *dev = imx8qxp_ldb->dev;
+ bool is_split = ldb_channel_is_split_link(ldb_ch);
+ int ret;
+
+ if (ldb_ch->chno == 0 || is_split) {
+ ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK;
+ ldb->ldb_ctrl |= imx8qxp_ldb_ch->di_id == 0 ?
+ LDB_CH0_MODE_EN_TO_DI0 : LDB_CH0_MODE_EN_TO_DI1;
+ }
+ if (ldb_ch->chno == 1 || is_split) {
+ ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK;
+ ldb->ldb_ctrl |= imx8qxp_ldb_ch->di_id == 0 ?
+ LDB_CH1_MODE_EN_TO_DI0 : LDB_CH1_MODE_EN_TO_DI1;
+ }
+
+ ldb_bridge_enable_helper(bridge);
+
+ ret = phy_power_on(imx8qxp_ldb_ch->phy);
+ if (ret)
+ DRM_DEV_ERROR(dev, "failed to power on PHY: %d\n", ret);
+
+ if (is_split && companion)
+ companion->funcs->atomic_enable(companion, old_bridge_state);
+}
+
+static void
+imx8qxp_ldb_bridge_atomic_disable(struct drm_bridge *bridge,
+ struct drm_bridge_state *old_bridge_state)
+{
+ struct ldb_channel *ldb_ch = bridge->driver_private;
+ struct ldb *ldb = ldb_ch->ldb;
+ struct imx8qxp_ldb_channel *imx8qxp_ldb_ch =
+ base_to_imx8qxp_ldb_channel(ldb_ch);
+ struct imx8qxp_ldb *imx8qxp_ldb = base_to_imx8qxp_ldb(ldb);
+ struct drm_bridge *companion = imx8qxp_ldb->companion;
+ struct device *dev = imx8qxp_ldb->dev;
+ bool is_split = ldb_channel_is_split_link(ldb_ch);
+ int ret;
+
+ ret = phy_power_off(imx8qxp_ldb_ch->phy);
+ if (ret)
+ DRM_DEV_ERROR(dev, "failed to power off PHY: %d\n", ret);
+
+ ret = phy_exit(imx8qxp_ldb_ch->phy);
+ if (ret < 0)
+ DRM_DEV_ERROR(dev, "failed to teardown PHY: %d\n", ret);
+
+ ldb_bridge_disable_helper(bridge);
+
+ clk_disable_unprepare(imx8qxp_ldb->clk_bypass);
+ clk_disable_unprepare(imx8qxp_ldb->clk_pixel);
+
+ if (is_split && companion)
+ companion->funcs->atomic_disable(companion, old_bridge_state);
+
+ ret = pm_runtime_put(dev);
+ if (ret < 0)
+ DRM_DEV_ERROR(dev, "failed to put runtime PM: %d\n", ret);
+}
+
+static const u32 imx8qxp_ldb_bus_output_fmts[] = {
+ MEDIA_BUS_FMT_RGB666_1X7X3_SPWG,
+ MEDIA_BUS_FMT_RGB888_1X7X4_SPWG,
+ MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA,
+ MEDIA_BUS_FMT_FIXED,
+};
+
+static bool imx8qxp_ldb_bus_output_fmt_supported(u32 fmt)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(imx8qxp_ldb_bus_output_fmts); i++) {
+ if (imx8qxp_ldb_bus_output_fmts[i] == fmt)
+ return true;
+ }
+
+ return false;
+}
+
+static u32 *
+imx8qxp_ldb_bridge_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 drm_display_info *di;
+ const struct drm_format_info *finfo;
+ u32 *input_fmts;
+
+ if (!imx8qxp_ldb_bus_output_fmt_supported(output_fmt))
+ return NULL;
+
+ *num_input_fmts = 1;
+
+ input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL);
+ if (!input_fmts)
+ return NULL;
+
+ switch (output_fmt) {
+ case MEDIA_BUS_FMT_FIXED:
+ di = &conn_state->connector->display_info;
+
+ /*
+ * Look at the first bus format to determine input format.
+ * Default to MEDIA_BUS_FMT_RGB888_1X24, if no match.
+ */
+ if (di->num_bus_formats) {
+ finfo = drm_format_info(di->bus_formats[0]);
+
+ input_fmts[0] = finfo->depth == 18 ?
+ MEDIA_BUS_FMT_RGB666_1X24_CPADHI :
+ MEDIA_BUS_FMT_RGB888_1X24;
+ } else {
+ input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X24;
+ }
+ break;
+ case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
+ input_fmts[0] = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
+ break;
+ case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:
+ case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:
+ input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X24;
+ break;
+ default:
+ kfree(input_fmts);
+ input_fmts = NULL;
+ break;
+ }
+
+ return input_fmts;
+}
+
+static u32 *
+imx8qxp_ldb_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge,
+ struct drm_bridge_state *bridge_state,
+ struct drm_crtc_state *crtc_state,
+ struct drm_connector_state *conn_state,
+ unsigned int *num_output_fmts)
+{
+ *num_output_fmts = ARRAY_SIZE(imx8qxp_ldb_bus_output_fmts);
+ return kmemdup(imx8qxp_ldb_bus_output_fmts,
+ sizeof(imx8qxp_ldb_bus_output_fmts), GFP_KERNEL);
+}
+
+static enum drm_mode_status
+imx8qxp_ldb_bridge_mode_valid(struct drm_bridge *bridge,
+ const struct drm_display_info *info,
+ const struct drm_display_mode *mode)
+{
+ struct ldb_channel *ldb_ch = bridge->driver_private;
+ bool is_single = ldb_channel_is_single_link(ldb_ch);
+
+ if (mode->clock > 170000)
+ return MODE_CLOCK_HIGH;
+
+ if (mode->clock > 150000 && is_single)
+ return MODE_CLOCK_HIGH;
+
+ return MODE_OK;
+}
+
+static const struct drm_bridge_funcs imx8qxp_ldb_bridge_funcs = {
+ .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,
+ .mode_valid = imx8qxp_ldb_bridge_mode_valid,
+ .attach = ldb_bridge_attach_helper,
+ .atomic_check = imx8qxp_ldb_bridge_atomic_check,
+ .mode_set = imx8qxp_ldb_bridge_mode_set,
+ .atomic_pre_enable = imx8qxp_ldb_bridge_atomic_pre_enable,
+ .atomic_enable = imx8qxp_ldb_bridge_atomic_enable,
+ .atomic_disable = imx8qxp_ldb_bridge_atomic_disable,
+ .atomic_get_input_bus_fmts =
+ imx8qxp_ldb_bridge_atomic_get_input_bus_fmts,
+ .atomic_get_output_bus_fmts =
+ imx8qxp_ldb_bridge_atomic_get_output_bus_fmts,
+};
+
+static int imx8qxp_ldb_set_di_id(struct imx8qxp_ldb *imx8qxp_ldb)
+{
+ struct imx8qxp_ldb_channel *imx8qxp_ldb_ch =
+ &imx8qxp_ldb->channel[imx8qxp_ldb->active_chno];
+ struct ldb_channel *ldb_ch = &imx8qxp_ldb_ch->base;
+ struct device_node *ep, *remote;
+ struct device *dev = imx8qxp_ldb->dev;
+ struct of_endpoint endpoint;
+ int ret;
+
+ ep = of_graph_get_endpoint_by_regs(ldb_ch->np, 0, -1);
+ if (!ep) {
+ DRM_DEV_ERROR(dev, "failed to get port0 endpoint\n");
+ return -EINVAL;
+ }
+
+ remote = of_graph_get_remote_endpoint(ep);
+ of_node_put(ep);
+ if (!remote) {
+ DRM_DEV_ERROR(dev, "failed to get port0 remote endpoint\n");
+ return -EINVAL;
+ }
+
+ ret = of_graph_parse_endpoint(remote, &endpoint);
+ of_node_put(remote);
+ if (ret) {
+ DRM_DEV_ERROR(dev, "failed to parse port0 remote endpoint: %d\n",
+ ret);
+ return ret;
+ }
+
+ imx8qxp_ldb_ch->di_id = endpoint.id;
+
+ return 0;
+}
+
+static int
+imx8qxp_ldb_check_chno_and_dual_link(struct ldb_channel *ldb_ch, int link)
+{
+ if ((link == DRM_LVDS_DUAL_LINK_ODD_EVEN_PIXELS && ldb_ch->chno != 0) ||
+ (link == DRM_LVDS_DUAL_LINK_EVEN_ODD_PIXELS && ldb_ch->chno != 1))
+ return -EINVAL;
+
+ return 0;
+}
+
+static int imx8qxp_ldb_parse_dt_companion(struct imx8qxp_ldb *imx8qxp_ldb)
+{
+ struct imx8qxp_ldb_channel *imx8qxp_ldb_ch =
+ &imx8qxp_ldb->channel[imx8qxp_ldb->active_chno];
+ struct ldb_channel *ldb_ch = &imx8qxp_ldb_ch->base;
+ struct ldb_channel *companion_ldb_ch;
+ struct device_node *companion;
+ struct device_node *child;
+ struct device_node *companion_port = NULL;
+ struct device_node *port1, *port2;
+ struct device *dev = imx8qxp_ldb->dev;
+ const struct of_device_id *match;
+ u32 i;
+ int dual_link;
+ int ret;
+
+ /* Locate the companion LDB for dual-link operation, if any. */
+ companion = of_parse_phandle(dev->of_node, "fsl,companion-ldb", 0);
+ if (!companion)
+ return 0;
+
+ if (!of_device_is_available(companion)) {
+ DRM_DEV_ERROR(dev, "companion LDB is not available\n");
+ ret = -ENODEV;
+ goto out;
+ }
+
+ /*
+ * Sanity check: the companion bridge must have the same compatible
+ * string.
+ */
+ match = of_match_device(dev->driver->of_match_table, dev);
+ if (!of_device_is_compatible(companion, match->compatible)) {
+ DRM_DEV_ERROR(dev, "companion LDB is incompatible\n");
+ ret = -ENXIO;
+ goto out;
+ }
+
+ for_each_available_child_of_node(companion, child) {
+ ret = of_property_read_u32(child, "reg", &i);
+ if (ret || i > MAX_LDB_CHAN_NUM - 1) {
+ DRM_DEV_ERROR(dev,
+ "invalid channel node address: %u\n", i);
+ ret = -EINVAL;
+ of_node_put(child);
+ goto out;
+ }
+
+ /*
+ * Channel numbers have to be different, because channel0
+ * transmits odd pixels and channel1 transmits even pixels.
+ */
+ if (i == (ldb_ch->chno ^ 0x1)) {
+ companion_port = child;
+ break;
+ }
+ }
+
+ if (!companion_port) {
+ DRM_DEV_ERROR(dev,
+ "failed to find companion LDB channel port\n");
+ ret = -EINVAL;
+ goto out;
+ }
+
+ /*
+ * We need to work out if the sink is expecting us to function in
+ * dual-link mode. We do this by looking at the DT port nodes we are
+ * connected to. If they are marked as expecting odd pixels and
+ * even pixels than we need to enable LDB split mode.
+ */
+ port1 = of_graph_get_port_by_id(ldb_ch->np, 1);
+ port2 = of_graph_get_port_by_id(companion_port, 1);
+ dual_link = drm_of_lvds_get_dual_link_pixel_order(port1, port2);
+ of_node_put(port1);
+ of_node_put(port2);
+
+ switch (dual_link) {
+ case DRM_LVDS_DUAL_LINK_ODD_EVEN_PIXELS:
+ ldb_ch->link_type = LDB_CH_DUAL_LINK_ODD_EVEN_PIXELS;
+ break;
+ case DRM_LVDS_DUAL_LINK_EVEN_ODD_PIXELS:
+ ldb_ch->link_type = LDB_CH_DUAL_LINK_EVEN_ODD_PIXELS;
+ break;
+ default:
+ ret = dual_link;
+ DRM_DEV_ERROR(dev,
+ "failed to get dual link pixel order: %d\n", ret);
+ goto out;
+ }
+
+ ret = imx8qxp_ldb_check_chno_and_dual_link(ldb_ch, dual_link);
+ if (ret < 0) {
+ DRM_DEV_ERROR(dev,
+ "unmatched channel number(%u) vs dual link(%d)\n",
+ ldb_ch->chno, dual_link);
+ goto out;
+ }
+
+ imx8qxp_ldb->companion = of_drm_find_bridge(companion_port);
+ if (!imx8qxp_ldb->companion) {
+ ret = -EPROBE_DEFER;
+ DRM_DEV_DEBUG_DRIVER(dev,
+ "failed to find bridge for companion bridge: %d\n",
+ ret);
+ goto out;
+ }
+
+ DRM_DEV_DEBUG_DRIVER(dev,
+ "dual-link configuration detected (companion bridge %pOF)\n",
+ companion);
+
+ companion_ldb_ch = bridge_to_ldb_ch(imx8qxp_ldb->companion);
+ companion_ldb_ch->link_type = ldb_ch->link_type;
+out:
+ of_node_put(companion_port);
+ of_node_put(companion);
+ return ret;
+}
+
+static int imx8qxp_ldb_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct imx8qxp_ldb *imx8qxp_ldb;
+ struct imx8qxp_ldb_channel *imx8qxp_ldb_ch;
+ struct ldb *ldb;
+ struct ldb_channel *ldb_ch;
+ int ret, i;
+
+ imx8qxp_ldb = devm_kzalloc(dev, sizeof(*imx8qxp_ldb), GFP_KERNEL);
+ if (!imx8qxp_ldb)
+ return -ENOMEM;
+
+ imx8qxp_ldb->clk_pixel = devm_clk_get(dev, "pixel");
+ if (IS_ERR(imx8qxp_ldb->clk_pixel)) {
+ ret = PTR_ERR(imx8qxp_ldb->clk_pixel);
+ if (ret != -EPROBE_DEFER)
+ DRM_DEV_ERROR(dev,
+ "failed to get pixel clock: %d\n", ret);
+ return ret;
+ }
+
+ imx8qxp_ldb->clk_bypass = devm_clk_get(dev, "bypass");
+ if (IS_ERR(imx8qxp_ldb->clk_bypass)) {
+ ret = PTR_ERR(imx8qxp_ldb->clk_bypass);
+ if (ret != -EPROBE_DEFER)
+ DRM_DEV_ERROR(dev,
+ "failed to get bypass clock: %d\n", ret);
+ return ret;
+ }
+
+ imx8qxp_ldb->dev = dev;
+
+ ldb = &imx8qxp_ldb->base;
+ ldb->dev = dev;
+ ldb->ctrl_reg = 0xe0;
+
+ for (i = 0; i < MAX_LDB_CHAN_NUM; i++)
+ ldb->channel[i] = &imx8qxp_ldb->channel[i].base;
+
+ ret = ldb_init_helper(ldb);
+ if (ret)
+ return ret;
+
+ if (ldb->available_ch_cnt == 0) {
+ DRM_DEV_DEBUG_DRIVER(dev, "no available channel\n");
+ return 0;
+ } else if (ldb->available_ch_cnt > 1) {
+ DRM_DEV_ERROR(dev, "invalid available channel number(%u)\n",
+ ldb->available_ch_cnt);
+ return -EINVAL;
+ }
+
+ for (i = 0; i < MAX_LDB_CHAN_NUM; i++) {
+ imx8qxp_ldb_ch = &imx8qxp_ldb->channel[i];
+ ldb_ch = &imx8qxp_ldb_ch->base;
+
+ if (ldb_ch->is_available) {
+ imx8qxp_ldb->active_chno = ldb_ch->chno;
+ break;
+ }
+ }
+
+ imx8qxp_ldb_ch->phy = devm_of_phy_get(dev, ldb_ch->np, "lvds_phy");
+ if (IS_ERR(imx8qxp_ldb_ch->phy)) {
+ ret = PTR_ERR(imx8qxp_ldb_ch->phy);
+ if (ret != -EPROBE_DEFER)
+ DRM_DEV_ERROR(dev, "failed to get channel%d PHY: %d\n",
+ imx8qxp_ldb->active_chno, ret);
+ return ret;
+ }
+
+ ret = ldb_find_next_bridge_helper(ldb);
+ if (ret)
+ return ret;
+
+ ret = imx8qxp_ldb_set_di_id(imx8qxp_ldb);
+ if (ret)
+ return ret;
+
+ ret = imx8qxp_ldb_parse_dt_companion(imx8qxp_ldb);
+ if (ret)
+ return ret;
+
+ platform_set_drvdata(pdev, imx8qxp_ldb);
+ pm_runtime_enable(dev);
+
+ ldb_add_bridge_helper(ldb, &imx8qxp_ldb_bridge_funcs);
+
+ return ret;
+}
+
+static int imx8qxp_ldb_remove(struct platform_device *pdev)
+{
+ struct imx8qxp_ldb *imx8qxp_ldb = platform_get_drvdata(pdev);
+ struct ldb *ldb = &imx8qxp_ldb->base;
+
+ ldb_remove_bridge_helper(ldb);
+
+ pm_runtime_disable(&pdev->dev);
+
+ return 0;
+}
+
+static int __maybe_unused imx8qxp_ldb_runtime_suspend(struct device *dev)
+{
+ return 0;
+}
+
+static int __maybe_unused imx8qxp_ldb_runtime_resume(struct device *dev)
+{
+ struct imx8qxp_ldb *imx8qxp_ldb = dev_get_drvdata(dev);
+ struct ldb *ldb = &imx8qxp_ldb->base;
+
+ /* disable LDB by resetting the control register to POR default */
+ regmap_write(ldb->regmap, ldb->ctrl_reg, 0);
+
+ return 0;
+}
+
+static const struct dev_pm_ops imx8qxp_ldb_pm_ops = {
+ SET_RUNTIME_PM_OPS(imx8qxp_ldb_runtime_suspend,
+ imx8qxp_ldb_runtime_resume, NULL)
+};
+
+static const struct of_device_id imx8qxp_ldb_dt_ids[] = {
+ { .compatible = "fsl,imx8qxp-ldb" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, imx8qxp_ldb_dt_ids);
+
+static struct platform_driver imx8qxp_ldb_driver = {
+ .probe = imx8qxp_ldb_probe,
+ .remove = imx8qxp_ldb_remove,
+ .driver = {
+ .pm = &imx8qxp_ldb_pm_ops,
+ .name = DRIVER_NAME,
+ .of_match_table = imx8qxp_ldb_dt_ids,
+ },
+};
+module_platform_driver(imx8qxp_ldb_driver);
+
+MODULE_DESCRIPTION("i.MX8QXP LVDS Display Bridge(LDB)/Pixel Mapper bridge driver");
+MODULE_AUTHOR("Liu Ying <victor.liu@nxp.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" DRIVER_NAME);