1 // SPDX-License-Identifier: GPL-2.0-only
3  * (C) COPYRIGHT 2012-2013 ARM Limited. All rights reserved.
7  * Copyright (c) 2006-2008 Intel Corporation
15  * The PL110/PL111 is a simple LCD controller that can support TFT
29  * - Fix race between setting plane base address and getting IRQ for
32  * - Read back hardware state at boot to skip reprogramming the
33  *   hardware when doing a no-op modeset.
35  * - Use the CLKSEL bit to support switching between the two external
40 #include <linux/dma-buf.h>
76 	struct pl111_drm_dev_private *priv = dev->dev_private;  in pl111_modeset_init()
77 	struct device_node *np = dev->dev->of_node;  in pl111_modeset_init()
79 	struct drm_panel *panel = NULL;  in pl111_modeset_init()  local
89 	mode_config = &dev->mode_config;  in pl111_modeset_init()
90 	mode_config->funcs = &mode_config_funcs;  in pl111_modeset_init()
91 	mode_config->min_width = 1;  in pl111_modeset_init()
92 	mode_config->max_width = 1024;  in pl111_modeset_init()
93 	mode_config->min_height = 1;  in pl111_modeset_init()
94 	mode_config->max_height = 768;  in pl111_modeset_init()
101 		dev_dbg(dev->dev, "checking endpoint %d\n", i);  in pl111_modeset_init()
103 		ret = drm_of_find_panel_or_bridge(dev->dev->of_node,  in pl111_modeset_init()
108 			if (ret == -EPROBE_DEFER) {  in pl111_modeset_init()
111 				 * another way of saying -ENODEV, but let's  in pl111_modeset_init()
115 			} else if (ret != -ENODEV) {  in pl111_modeset_init()
117 				dev_err(dev->dev,  in pl111_modeset_init()
123 			dev_info(dev->dev,  in pl111_modeset_init()
124 				 "found panel on endpoint %d\n", i);  in pl111_modeset_init()
125 			panel = tmp_panel;  in pl111_modeset_init()
128 			dev_info(dev->dev,  in pl111_modeset_init()
137 	 * If we can't find neither panel nor bridge on any of the  in pl111_modeset_init()
138 	 * endpoints, and any of them retured -EPROBE_DEFER, then  in pl111_modeset_init()
141 	if ((!panel && !bridge) && defer)  in pl111_modeset_init()
142 		return -EPROBE_DEFER;  in pl111_modeset_init()
144 	if (panel) {  in pl111_modeset_init()
145 		bridge = drm_panel_bridge_add_typed(panel,  in pl111_modeset_init()
152 		dev_info(dev->dev, "Using non-panel bridge\n");  in pl111_modeset_init()
154 		dev_err(dev->dev, "No bridge, exiting\n");  in pl111_modeset_init()
155 		return -ENODEV;  in pl111_modeset_init()
158 	priv->bridge = bridge;  in pl111_modeset_init()
159 	if (panel) {  in pl111_modeset_init()
160 		priv->panel = panel;  in pl111_modeset_init()
161 		priv->connector = drm_panel_bridge_connector(bridge);  in pl111_modeset_init()
166 		dev_err(dev->dev, "Failed to init display\n");  in pl111_modeset_init()
170 	ret = drm_simple_display_pipe_attach_bridge(&priv->pipe,  in pl111_modeset_init()
175 	if (!priv->variant->broken_vblank) {  in pl111_modeset_init()
178 			dev_err(dev->dev, "Failed to init vblank\n");  in pl111_modeset_init()
190 	if (panel)  in pl111_modeset_init()
201 	struct pl111_drm_dev_private *priv = dev->dev_private;  in pl111_gem_import_sg_table()
204 	 * When using device-specific reserved memory we can't import  in pl111_gem_import_sg_table()
208 	if (priv->use_device_memory)  in pl111_gem_import_sg_table()
209 		return ERR_PTR(-EINVAL);  in pl111_gem_import_sg_table()
245 	struct device *dev = &amba_dev->dev;  in pl111_amba_probe()
247 	const struct pl111_variant_data *variant = id->data;  in pl111_amba_probe()
253 		return -ENOMEM;  in pl111_amba_probe()
259 	priv->drm = drm;  in pl111_amba_probe()
260 	drm->dev_private = priv;  in pl111_amba_probe()
261 	priv->variant = variant;  in pl111_amba_probe()
265 		dev_info(dev, "using device-specific reserved memory\n");  in pl111_amba_probe()
266 		priv->use_device_memory = true;  in pl111_amba_probe()
269 	if (of_property_read_u32(dev->of_node, "max-memory-bandwidth",  in pl111_amba_probe()
270 				 &priv->memory_bw)) {  in pl111_amba_probe()
272 		priv->memory_bw = 0;  in pl111_amba_probe()
276 	if (variant->is_pl110 || variant->is_lcdc) {  in pl111_amba_probe()
277 		priv->ienb = CLCD_PL110_IENB;  in pl111_amba_probe()
278 		priv->ctrl = CLCD_PL110_CNTL;  in pl111_amba_probe()
280 		priv->ienb = CLCD_PL111_IENB;  in pl111_amba_probe()
281 		priv->ctrl = CLCD_PL111_CNTL;  in pl111_amba_probe()
284 	priv->regs = devm_ioremap_resource(dev, &amba_dev->res);  in pl111_amba_probe()
285 	if (IS_ERR(priv->regs)) {  in pl111_amba_probe()
287 		ret = PTR_ERR(priv->regs);  in pl111_amba_probe()
299 	writel(0, priv->regs + priv->ienb);  in pl111_amba_probe()
301 	ret = devm_request_irq(dev, amba_dev->irq[0], pl111_irq, 0,  in pl111_amba_probe()
302 			       variant->name, priv);  in pl111_amba_probe()
316 	drm_fbdev_generic_setup(drm, priv->variant->fb_bpp);  in pl111_amba_probe()
329 	struct device *dev = &amba_dev->dev;  in pl111_amba_remove()
331 	struct pl111_drm_dev_private *priv = drm->dev_private;  in pl111_amba_remove()
334 	if (priv->panel)  in pl111_amba_remove()
335 		drm_panel_bridge_remove(priv->bridge);  in pl111_amba_remove()
364 /* RealView, Versatile Express etc use this modern variant */
440 		.name = "drm-clcd-pl111",