drm/bridge/cros-ec-anx7688.c

1 // SPDX-License-Identifier: GPL-2.0-only
3  * CrOS EC ANX7688 HDMI->DP bridge driver
58 	if (!anx->filter)  in cros_ec_anx7688_bridge_mode_fixup()
61 	/* Read both regs 0x85 (bandwidth) and 0x86 (lane count). */  in cros_ec_anx7688_bridge_mode_fixup()
62 	ret = regmap_bulk_read(anx->regmap, ANX7688_DP_BANDWIDTH_REG, regs, 2);  in cros_ec_anx7688_bridge_mode_fixup()
64 		DRM_ERROR("Failed to read bandwidth/lane count\n");  in cros_ec_anx7688_bridge_mode_fixup()
72 		DRM_ERROR("Invalid bandwidth/lane count (%02x/%d)\n", dpbw,  in cros_ec_anx7688_bridge_mode_fixup()
81 	requiredbw = mode->clock * 8 * 3;  in cros_ec_anx7688_bridge_mode_fixup()
87 		DRM_ERROR("Bandwidth/lane count are 0, not rejecting modes\n");  in cros_ec_anx7688_bridge_mode_fixup()
100 	struct device *dev = &client->dev;  in cros_ec_anx7688_bridge_probe()
108 		return -ENOMEM;  in cros_ec_anx7688_bridge_probe()
110 	anx7688->client = client;  in cros_ec_anx7688_bridge_probe()
113 	anx7688->regmap = devm_regmap_init_i2c(client, &cros_ec_anx7688_regmap_config);  in cros_ec_anx7688_bridge_probe()
114 	if (IS_ERR(anx7688->regmap)) {  in cros_ec_anx7688_bridge_probe()
115 		ret = PTR_ERR(anx7688->regmap);  in cros_ec_anx7688_bridge_probe()
121 	ret = regmap_bulk_read(anx7688->regmap, ANX7688_VENDOR_ID_REG,  in cros_ec_anx7688_bridge_probe()
133 		return -ENODEV;  in cros_ec_anx7688_bridge_probe()
136 	ret = regmap_bulk_read(anx7688->regmap, ANX7688_FW_VERSION_REG,  in cros_ec_anx7688_bridge_probe()
146 	anx7688->bridge.of_node = dev->of_node;  in cros_ec_anx7688_bridge_probe()
148 	/* FW version >= 0.85 supports bandwidth/lane count registers */  in cros_ec_anx7688_bridge_probe()
150 		anx7688->filter = true;  in cros_ec_anx7688_bridge_probe()
156 	anx7688->bridge.funcs = &cros_ec_anx7688_bridge_funcs;  in cros_ec_anx7688_bridge_probe()
157 	drm_bridge_add(&anx7688->bridge);  in cros_ec_anx7688_bridge_probe()
166 	drm_bridge_remove(&anx7688->bridge);  in cros_ec_anx7688_bridge_remove()
170 	{ .compatible = "google,cros-ec-anx7688" },
179 		.name = "cros-ec-anx7688-bridge",
186 MODULE_DESCRIPTION("ChromeOS EC ANX7688 HDMI->DP bridge driver");