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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Copyright (C) 2015 Free Electrons4 * Copyright (C) 2015 NextThing Co5 *6 * Maxime Ripard <maxime.ripard@free-electrons.com>7 */8 9#include <linux/clk.h>10 11#include <drm/drm_atomic_helper.h>12#include <drm/drm_bridge.h>13#include <drm/drm_of.h>14#include <drm/drm_panel.h>15#include <drm/drm_print.h>16#include <drm/drm_probe_helper.h>17#include <drm/drm_simple_kms_helper.h>18 19#include "sun4i_crtc.h"20#include "sun4i_tcon.h"21#include "sun4i_rgb.h"22 23struct sun4i_rgb {24 struct drm_connector connector;25 struct drm_encoder encoder;26 27 struct sun4i_tcon *tcon;28 struct drm_panel *panel;29 struct drm_bridge *bridge;30};31 32static inline struct sun4i_rgb *33drm_connector_to_sun4i_rgb(struct drm_connector *connector)34{35 return container_of(connector, struct sun4i_rgb,36 connector);37}38 39static inline struct sun4i_rgb *40drm_encoder_to_sun4i_rgb(struct drm_encoder *encoder)41{42 return container_of(encoder, struct sun4i_rgb,43 encoder);44}45 46static int sun4i_rgb_get_modes(struct drm_connector *connector)47{48 struct sun4i_rgb *rgb =49 drm_connector_to_sun4i_rgb(connector);50 51 return drm_panel_get_modes(rgb->panel, connector);52}53 54/*55 * VESA DMT defines a tolerance of 0.5% on the pixel clock, while the56 * CVT spec reuses that tolerance in its examples, so it looks to be a57 * good default tolerance for the EDID-based modes. Define it to 5 per58 * mille to avoid floating point operations.59 */60#define SUN4I_RGB_DOTCLOCK_TOLERANCE_PER_MILLE 561 62static enum drm_mode_status sun4i_rgb_mode_valid(struct drm_encoder *crtc,63 const struct drm_display_mode *mode)64{65 struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(crtc);66 struct sun4i_tcon *tcon = rgb->tcon;67 u32 hsync = mode->hsync_end - mode->hsync_start;68 u32 vsync = mode->vsync_end - mode->vsync_start;69 unsigned long long rate = mode->clock * 1000;70 unsigned long long lowest, highest;71 unsigned long long rounded_rate;72 73 DRM_DEBUG_DRIVER("Validating modes...\n");74 75 if (hsync < 1)76 return MODE_HSYNC_NARROW;77 78 if (hsync > 0x3ff)79 return MODE_HSYNC_WIDE;80 81 if ((mode->hdisplay < 1) || (mode->htotal < 1))82 return MODE_H_ILLEGAL;83 84 if ((mode->hdisplay > 0x7ff) || (mode->htotal > 0xfff))85 return MODE_BAD_HVALUE;86 87 DRM_DEBUG_DRIVER("Horizontal parameters OK\n");88 89 if (vsync < 1)90 return MODE_VSYNC_NARROW;91 92 if (vsync > 0x3ff)93 return MODE_VSYNC_WIDE;94 95 if ((mode->vdisplay < 1) || (mode->vtotal < 1))96 return MODE_V_ILLEGAL;97 98 if ((mode->vdisplay > 0x7ff) || (mode->vtotal > 0xfff))99 return MODE_BAD_VVALUE;100 101 DRM_DEBUG_DRIVER("Vertical parameters OK\n");102 103 /*104 * TODO: We should use the struct display_timing if available105 * and / or trying to stretch the timings within that106 * tolerancy to take care of panels that we wouldn't be able107 * to have a exact match for.108 */109 if (rgb->panel) {110 DRM_DEBUG_DRIVER("RGB panel used, skipping clock rate checks");111 goto out;112 }113 114 /*115 * That shouldn't ever happen unless something is really wrong, but it116 * doesn't harm to check.117 */118 if (!rgb->bridge)119 goto out;120 121 tcon->dclk_min_div = 6;122 tcon->dclk_max_div = 127;123 rounded_rate = clk_round_rate(tcon->dclk, rate);124 125 lowest = rate * (1000 - SUN4I_RGB_DOTCLOCK_TOLERANCE_PER_MILLE);126 do_div(lowest, 1000);127 if (rounded_rate < lowest)128 return MODE_CLOCK_LOW;129 130 highest = rate * (1000 + SUN4I_RGB_DOTCLOCK_TOLERANCE_PER_MILLE);131 do_div(highest, 1000);132 if (rounded_rate > highest)133 return MODE_CLOCK_HIGH;134 135out:136 DRM_DEBUG_DRIVER("Clock rate OK\n");137 138 return MODE_OK;139}140 141static const struct drm_connector_helper_funcs sun4i_rgb_con_helper_funcs = {142 .get_modes = sun4i_rgb_get_modes,143};144 145static void146sun4i_rgb_connector_destroy(struct drm_connector *connector)147{148 drm_connector_cleanup(connector);149}150 151static const struct drm_connector_funcs sun4i_rgb_con_funcs = {152 .fill_modes = drm_helper_probe_single_connector_modes,153 .destroy = sun4i_rgb_connector_destroy,154 .reset = drm_atomic_helper_connector_reset,155 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,156 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,157};158 159static void sun4i_rgb_encoder_enable(struct drm_encoder *encoder)160{161 struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);162 163 DRM_DEBUG_DRIVER("Enabling RGB output\n");164 165 if (rgb->panel) {166 drm_panel_prepare(rgb->panel);167 drm_panel_enable(rgb->panel);168 }169}170 171static void sun4i_rgb_encoder_disable(struct drm_encoder *encoder)172{173 struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);174 175 DRM_DEBUG_DRIVER("Disabling RGB output\n");176 177 if (rgb->panel) {178 drm_panel_disable(rgb->panel);179 drm_panel_unprepare(rgb->panel);180 }181}182 183static const struct drm_encoder_helper_funcs sun4i_rgb_enc_helper_funcs = {184 .disable = sun4i_rgb_encoder_disable,185 .enable = sun4i_rgb_encoder_enable,186 .mode_valid = sun4i_rgb_mode_valid,187};188 189int sun4i_rgb_init(struct drm_device *drm, struct sun4i_tcon *tcon)190{191 struct drm_encoder *encoder;192 struct sun4i_rgb *rgb;193 int ret;194 195 rgb = devm_kzalloc(drm->dev, sizeof(*rgb), GFP_KERNEL);196 if (!rgb)197 return -ENOMEM;198 rgb->tcon = tcon;199 encoder = &rgb->encoder;200 201 ret = drm_of_find_panel_or_bridge(tcon->dev->of_node, 1, 0,202 &rgb->panel, &rgb->bridge);203 if (ret) {204 dev_info(drm->dev, "No panel or bridge found... RGB output disabled\n");205 return 0;206 }207 208 drm_encoder_helper_add(&rgb->encoder,209 &sun4i_rgb_enc_helper_funcs);210 ret = drm_simple_encoder_init(drm, &rgb->encoder,211 DRM_MODE_ENCODER_NONE);212 if (ret) {213 dev_err(drm->dev, "Couldn't initialise the rgb encoder\n");214 goto err_out;215 }216 217 /* The RGB encoder can only work with the TCON channel 0 */218 rgb->encoder.possible_crtcs = drm_crtc_mask(&tcon->crtc->crtc);219 220 if (rgb->panel) {221 drm_connector_helper_add(&rgb->connector,222 &sun4i_rgb_con_helper_funcs);223 ret = drm_connector_init(drm, &rgb->connector,224 &sun4i_rgb_con_funcs,225 DRM_MODE_CONNECTOR_Unknown);226 if (ret) {227 dev_err(drm->dev, "Couldn't initialise the rgb connector\n");228 goto err_cleanup_connector;229 }230 231 drm_connector_attach_encoder(&rgb->connector,232 &rgb->encoder);233 }234 235 if (rgb->bridge) {236 ret = drm_bridge_attach(encoder, rgb->bridge, NULL, 0);237 if (ret)238 goto err_cleanup_connector;239 }240 241 return 0;242 243err_cleanup_connector:244 drm_encoder_cleanup(&rgb->encoder);245err_out:246 return ret;247}248EXPORT_SYMBOL(sun4i_rgb_init);249