change system file

hc

2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771

 kernel/drivers/gpu/drm/bridge/thc63lvd1024.c
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@@ -5,14 +5,16 @@
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  * Copyright (C) 2018 Jacopo Mondi <jacopo+renesas@jmondi.org>
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  */
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-#include <drm/drmP.h>
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-#include <drm/drm_bridge.h>
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-#include <drm/drm_panel.h>
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-
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 #include <linux/gpio/consumer.h>
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+#include <linux/module.h>
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+#include <linux/of.h>
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 #include <linux/of_graph.h>
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+#include <linux/platform_device.h>
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 #include <linux/regulator/consumer.h>
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 #include <linux/slab.h>
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+
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+#include <drm/drm_bridge.h>
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+#include <drm/drm_panel.h>
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 enum thc63_ports {
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 	THC63_LVDS_IN0,
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@@ -31,6 +33,8 @@
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 	struct drm_bridge bridge;
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 	struct drm_bridge *next;
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+
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+	struct drm_bridge_timings timings;
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 };
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 static inline struct thc63_dev *to_thc63(struct drm_bridge *bridge)
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@@ -38,11 +42,43 @@
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 	return container_of(bridge, struct thc63_dev, bridge);
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 }
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-static int thc63_attach(struct drm_bridge *bridge)
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+static int thc63_attach(struct drm_bridge *bridge,
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+			enum drm_bridge_attach_flags flags)
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 {
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 	struct thc63_dev *thc63 = to_thc63(bridge);
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-	return drm_bridge_attach(bridge->encoder, thc63->next, bridge);
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+	return drm_bridge_attach(bridge->encoder, thc63->next, bridge, flags);
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+}
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+
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+static enum drm_mode_status thc63_mode_valid(struct drm_bridge *bridge,
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+					const struct drm_display_info *info,
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+					const struct drm_display_mode *mode)
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+{
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+	struct thc63_dev *thc63 = to_thc63(bridge);
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+	unsigned int min_freq;
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+	unsigned int max_freq;
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+
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+	/*
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+	 * The THC63LVD1024 pixel rate range is 8 to 135 MHz in all modes but
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+	 * dual-in, single-out where it is 40 to 150 MHz. As dual-in, dual-out
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+	 * isn't supported by the driver yet, simply derive the limits from the
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+	 * input mode.
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+	 */
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+	if (thc63->timings.dual_link) {
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+		min_freq = 40000;
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+		max_freq = 150000;
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+	} else {
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+		min_freq = 8000;
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+		max_freq = 135000;
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+	}
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+
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+	if (mode->clock < min_freq)
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+		return MODE_CLOCK_LOW;
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+
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+	if (mode->clock > max_freq)
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+		return MODE_CLOCK_HIGH;
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+
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+	return MODE_OK;
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 }
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 static void thc63_enable(struct drm_bridge *bridge)
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@@ -77,25 +113,26 @@
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 static const struct drm_bridge_funcs thc63_bridge_func = {
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 	.attach	= thc63_attach,
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+	.mode_valid = thc63_mode_valid,
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 	.enable = thc63_enable,
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 	.disable = thc63_disable,
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 };
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 static int thc63_parse_dt(struct thc63_dev *thc63)
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 {
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-	struct device_node *thc63_out;
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+	struct device_node *endpoint;
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 	struct device_node *remote;
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-	thc63_out = of_graph_get_endpoint_by_regs(thc63->dev->of_node,
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-						  THC63_RGB_OUT0, -1);
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-	if (!thc63_out) {
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+	endpoint = of_graph_get_endpoint_by_regs(thc63->dev->of_node,
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+						 THC63_RGB_OUT0, -1);
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+	if (!endpoint) {
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 		dev_err(thc63->dev, "Missing endpoint in port@%u\n",
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 			THC63_RGB_OUT0);
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 		return -ENODEV;
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 	}
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-	remote = of_graph_get_remote_port_parent(thc63_out);
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-	of_node_put(thc63_out);
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+	remote = of_graph_get_remote_port_parent(endpoint);
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+	of_node_put(endpoint);
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 	if (!remote) {
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 		dev_err(thc63->dev, "Endpoint in port@%u unconnected\n",
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 			THC63_RGB_OUT0);
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@@ -113,6 +150,22 @@
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 	of_node_put(remote);
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 	if (!thc63->next)
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 		return -EPROBE_DEFER;
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+
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+	endpoint = of_graph_get_endpoint_by_regs(thc63->dev->of_node,
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+						 THC63_LVDS_IN1, -1);
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+	if (endpoint) {
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+		remote = of_graph_get_remote_port_parent(endpoint);
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+		of_node_put(endpoint);
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+
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+		if (remote) {
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+			if (of_device_is_available(remote))
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+				thc63->timings.dual_link = true;
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+			of_node_put(remote);
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+		}
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+	}
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+
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+	dev_dbg(thc63->dev, "operating in %s-link mode\n",
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+		thc63->timings.dual_link ? "dual" : "single");
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 	return 0;
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 }
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@@ -170,6 +223,7 @@
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 	thc63->bridge.driver_private = thc63;
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 	thc63->bridge.of_node = pdev->dev.of_node;
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 	thc63->bridge.funcs = &thc63_bridge_func;
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+	thc63->bridge.timings = &thc63->timings;
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 	drm_bridge_add(&thc63->bridge);
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