![Noralf Trønnes](/assets/img/avatar_default.png)
The CMA helper is already using the drm_fb_helper_generic_probe part of the generic fbdev emulation. This patch makes full use of the generic fbdev emulation by using its drm_client callbacks. This means that drm_mode_config_funcs->output_poll_changed and drm_driver->lastclose are now handled by the emulation code. Additionally fbdev unregister happens automatically on drm_dev_unregister(). The drm_fbdev_generic_setup() call is put after drm_dev_register() in the driver. This is done to highlight the fact that fbdev emulation is an internal client that makes use of the driver, it is not part of the driver as such. If fbdev setup fails, an error is printed, but the driver succeeds probing. Cc: Alexey Brodkin <abrodkin@synopsys.com> Signed-off-by: Noralf Trønnes <noralf@tronnes.org> Acked-by: Sam Ravnborg <sam@ravnborg.org> Acked-by: Alexey Brodkin <abrodkin@synopsys.com> Link: https://patchwork.freedesktop.org/patch/msgid/20181025201340.34227-2-noralf@tronnes.org
230 lines
5.7 KiB
C
230 lines
5.7 KiB
C
/*
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* ARC PGU DRM driver.
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*
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* Copyright (C) 2016 Synopsys, Inc. (www.synopsys.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/clk.h>
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#include <drm/drm_crtc_helper.h>
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#include <drm/drm_fb_cma_helper.h>
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#include <drm/drm_fb_helper.h>
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#include <drm/drm_gem_cma_helper.h>
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#include <drm/drm_gem_framebuffer_helper.h>
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#include <drm/drm_atomic_helper.h>
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#include <linux/of_reserved_mem.h>
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#include "arcpgu.h"
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#include "arcpgu_regs.h"
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static const struct drm_mode_config_funcs arcpgu_drm_modecfg_funcs = {
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.fb_create = drm_gem_fb_create,
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.atomic_check = drm_atomic_helper_check,
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.atomic_commit = drm_atomic_helper_commit,
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};
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static void arcpgu_setup_mode_config(struct drm_device *drm)
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{
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drm_mode_config_init(drm);
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drm->mode_config.min_width = 0;
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drm->mode_config.min_height = 0;
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drm->mode_config.max_width = 1920;
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drm->mode_config.max_height = 1080;
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drm->mode_config.funcs = &arcpgu_drm_modecfg_funcs;
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}
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DEFINE_DRM_GEM_CMA_FOPS(arcpgu_drm_ops);
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static int arcpgu_load(struct drm_device *drm)
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{
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struct platform_device *pdev = to_platform_device(drm->dev);
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struct arcpgu_drm_private *arcpgu;
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struct device_node *encoder_node;
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struct resource *res;
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int ret;
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arcpgu = devm_kzalloc(&pdev->dev, sizeof(*arcpgu), GFP_KERNEL);
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if (arcpgu == NULL)
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return -ENOMEM;
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drm->dev_private = arcpgu;
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arcpgu->clk = devm_clk_get(drm->dev, "pxlclk");
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if (IS_ERR(arcpgu->clk))
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return PTR_ERR(arcpgu->clk);
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arcpgu_setup_mode_config(drm);
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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arcpgu->regs = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(arcpgu->regs))
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return PTR_ERR(arcpgu->regs);
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dev_info(drm->dev, "arc_pgu ID: 0x%x\n",
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arc_pgu_read(arcpgu, ARCPGU_REG_ID));
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/* Get the optional framebuffer memory resource */
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ret = of_reserved_mem_device_init(drm->dev);
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if (ret && ret != -ENODEV)
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return ret;
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if (dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)))
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return -ENODEV;
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if (arc_pgu_setup_crtc(drm) < 0)
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return -ENODEV;
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/* find the encoder node and initialize it */
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encoder_node = of_parse_phandle(drm->dev->of_node, "encoder-slave", 0);
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if (encoder_node) {
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ret = arcpgu_drm_hdmi_init(drm, encoder_node);
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of_node_put(encoder_node);
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if (ret < 0)
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return ret;
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} else {
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ret = arcpgu_drm_sim_init(drm, NULL);
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if (ret < 0)
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return ret;
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}
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drm_mode_config_reset(drm);
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drm_kms_helper_poll_init(drm);
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platform_set_drvdata(pdev, drm);
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return 0;
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}
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static int arcpgu_unload(struct drm_device *drm)
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{
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drm_kms_helper_poll_fini(drm);
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drm_atomic_helper_shutdown(drm);
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drm_mode_config_cleanup(drm);
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return 0;
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}
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#ifdef CONFIG_DEBUG_FS
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static int arcpgu_show_pxlclock(struct seq_file *m, void *arg)
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{
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struct drm_info_node *node = (struct drm_info_node *)m->private;
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struct drm_device *drm = node->minor->dev;
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struct arcpgu_drm_private *arcpgu = drm->dev_private;
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unsigned long clkrate = clk_get_rate(arcpgu->clk);
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unsigned long mode_clock = arcpgu->crtc.mode.crtc_clock * 1000;
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seq_printf(m, "hw : %lu\n", clkrate);
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seq_printf(m, "mode: %lu\n", mode_clock);
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return 0;
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}
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static struct drm_info_list arcpgu_debugfs_list[] = {
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{ "clocks", arcpgu_show_pxlclock, 0 },
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};
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static int arcpgu_debugfs_init(struct drm_minor *minor)
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{
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return drm_debugfs_create_files(arcpgu_debugfs_list,
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ARRAY_SIZE(arcpgu_debugfs_list), minor->debugfs_root, minor);
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}
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#endif
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static struct drm_driver arcpgu_drm_driver = {
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.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME |
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DRIVER_ATOMIC,
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.name = "arcpgu",
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.desc = "ARC PGU Controller",
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.date = "20160219",
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.major = 1,
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.minor = 0,
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.patchlevel = 0,
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.fops = &arcpgu_drm_ops,
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.dumb_create = drm_gem_cma_dumb_create,
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.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
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.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
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.gem_free_object_unlocked = drm_gem_cma_free_object,
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.gem_print_info = drm_gem_cma_print_info,
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.gem_vm_ops = &drm_gem_cma_vm_ops,
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.gem_prime_export = drm_gem_prime_export,
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.gem_prime_import = drm_gem_prime_import,
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.gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
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.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
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.gem_prime_vmap = drm_gem_cma_prime_vmap,
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.gem_prime_vunmap = drm_gem_cma_prime_vunmap,
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.gem_prime_mmap = drm_gem_cma_prime_mmap,
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#ifdef CONFIG_DEBUG_FS
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.debugfs_init = arcpgu_debugfs_init,
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#endif
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};
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static int arcpgu_probe(struct platform_device *pdev)
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{
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struct drm_device *drm;
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int ret;
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drm = drm_dev_alloc(&arcpgu_drm_driver, &pdev->dev);
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if (IS_ERR(drm))
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return PTR_ERR(drm);
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ret = arcpgu_load(drm);
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if (ret)
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goto err_unref;
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ret = drm_dev_register(drm, 0);
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if (ret)
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goto err_unload;
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drm_fbdev_generic_setup(drm, 16);
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return 0;
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err_unload:
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arcpgu_unload(drm);
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err_unref:
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drm_dev_unref(drm);
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return ret;
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}
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static int arcpgu_remove(struct platform_device *pdev)
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{
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struct drm_device *drm = platform_get_drvdata(pdev);
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drm_dev_unregister(drm);
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arcpgu_unload(drm);
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drm_dev_unref(drm);
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return 0;
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}
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static const struct of_device_id arcpgu_of_table[] = {
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{.compatible = "snps,arcpgu"},
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{}
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};
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MODULE_DEVICE_TABLE(of, arcpgu_of_table);
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static struct platform_driver arcpgu_platform_driver = {
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.probe = arcpgu_probe,
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.remove = arcpgu_remove,
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.driver = {
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.name = "arcpgu",
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.of_match_table = arcpgu_of_table,
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},
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};
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module_platform_driver(arcpgu_platform_driver);
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MODULE_AUTHOR("Carlos Palminha <palminha@synopsys.com>");
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MODULE_DESCRIPTION("ARC PGU DRM driver");
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MODULE_LICENSE("GPL");
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