drm/logicvc/logicvc_mode.c

0001 // SPDX-License-Identifier: GPL-2.0+
0002 /*
0003  * Copyright (C) 2019-2022 Bootlin
0004  * Author: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
0005  */
0006
0007 #include <linux/types.h>
0008
0009 #include <drm/drm_atomic.h>
0010 #include <drm/drm_atomic_helper.h>
0011 #include <drm/drm_crtc_helper.h>
0012 #include <drm/drm_drv.h>
0013 #include <drm/drm_fb_cma_helper.h>
0014 #include <drm/drm_fb_helper.h>
0015 #include <drm/drm_gem_cma_helper.h>
0016 #include <drm/drm_gem_framebuffer_helper.h>
0017 #include <drm/drm_mode_config.h>
0018 #include <drm/drm_panel.h>
0019 #include <drm/drm_print.h>
0020 #include <drm/drm_probe_helper.h>
0021 #include <drm/drm_vblank.h>
0022
0023 #include "logicvc_drm.h"
0024 #include "logicvc_interface.h"
0025 #include "logicvc_layer.h"
0026 #include "logicvc_mode.h"
0027
0028 static const struct drm_mode_config_funcs logicvc_mode_config_funcs = {
0029     .fb_create      = drm_gem_fb_create,
0030     .output_poll_changed    = drm_fb_helper_output_poll_changed,
0031     .atomic_check       = drm_atomic_helper_check,
0032     .atomic_commit      = drm_atomic_helper_commit,
0033 };
0034
0035 int logicvc_mode_init(struct logicvc_drm *logicvc)
0036 {
0037     struct drm_device *drm_dev = &logicvc->drm_dev;
0038     struct drm_mode_config *mode_config = &drm_dev->mode_config;
0039     struct logicvc_layer *layer_primary;
0040     uint32_t preferred_depth;
0041     int ret;
0042
0043     ret = drm_vblank_init(drm_dev, mode_config->num_crtc);
0044     if (ret) {
0045         drm_err(drm_dev, "Failed to initialize vblank\n");
0046         return ret;
0047     }
0048
0049     layer_primary = logicvc_layer_get_primary(logicvc);
0050     if (!layer_primary) {
0051         drm_err(drm_dev, "Failed to get primary layer\n");
0052         return -EINVAL;
0053     }
0054
0055     preferred_depth = layer_primary->formats->depth;
0056
0057     /* DRM counts alpha in depth, our driver doesn't. */
0058     if (layer_primary->formats->alpha)
0059         preferred_depth += 8;
0060
0061     mode_config->min_width = 64;
0062     mode_config->max_width = 2048;
0063     mode_config->min_height = 1;
0064     mode_config->max_height = 2048;
0065     mode_config->preferred_depth = preferred_depth;
0066     mode_config->funcs = &logicvc_mode_config_funcs;
0067
0068     drm_mode_config_reset(drm_dev);
0069
0070     drm_kms_helper_poll_init(drm_dev);
0071
0072     return 0;
0073 }
0074
0075 void logicvc_mode_fini(struct logicvc_drm *logicvc)
0076 {
0077     struct drm_device *drm_dev = &logicvc->drm_dev;
0078
0079     drm_kms_helper_poll_fini(drm_dev);
0080 }