drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_crtc.c

   1 /*
   2  * Copyright 2015 Freescale Semiconductor, Inc.
   3  *
   4  * Freescale DCU drm device driver
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  */
  11
  12 #include <linux/clk.h>
  13 #include <linux/regmap.h>
  14
  15 #include <drm/drmP.h>
  16 #include <drm/drm_atomic.h>
  17 #include <drm/drm_atomic_helper.h>
  18 #include <drm/drm_crtc.h>
  19 #include <drm/drm_crtc_helper.h>
  20 #include <video/videomode.h>
  21
  22 #include "fsl_dcu_drm_crtc.h"
  23 #include "fsl_dcu_drm_drv.h"
  24 #include "fsl_dcu_drm_plane.h"
  25
  26 static void fsl_dcu_drm_crtc_atomic_flush(struct drm_crtc *crtc,
  27                                           struct drm_crtc_state *old_crtc_state)
  28 {
  29         struct drm_device *dev = crtc->dev;
  30         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
  31         struct drm_pending_vblank_event *event = crtc->state->event;
  32
  33         regmap_write(fsl_dev->regmap,
  34                      DCU_UPDATE_MODE, DCU_UPDATE_MODE_READREG);
  35
  36         if (event) {
  37                 crtc->state->event = NULL;
  38
  39                 spin_lock_irq(&crtc->dev->event_lock);
  40                 if (drm_crtc_vblank_get(crtc) == 0)
  41                         drm_crtc_arm_vblank_event(crtc, event);
  42                 else
  43                         drm_crtc_send_vblank_event(crtc, event);
  44                 spin_unlock_irq(&crtc->dev->event_lock);
  45         }
  46 }
  47
  48 static void fsl_dcu_drm_crtc_atomic_disable(struct drm_crtc *crtc,
  49                                         struct drm_crtc_state *old_crtc_state)
  50 {
  51         struct drm_device *dev = crtc->dev;
  52         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
  53
  54         /* always disable planes on the CRTC */
  55         drm_atomic_helper_disable_planes_on_crtc(old_crtc_state, true);
  56
  57         drm_crtc_vblank_off(crtc);
  58
  59         regmap_update_bits(fsl_dev->regmap, DCU_DCU_MODE,
  60                            DCU_MODE_DCU_MODE_MASK,
  61                            DCU_MODE_DCU_MODE(DCU_MODE_OFF));
  62         regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE,
  63                      DCU_UPDATE_MODE_READREG);
  64         clk_disable_unprepare(fsl_dev->pix_clk);
  65 }
  66
  67 static void fsl_dcu_drm_crtc_atomic_enable(struct drm_crtc *crtc,
  68                                            struct drm_crtc_state *old_state)
  69 {
  70         struct drm_device *dev = crtc->dev;
  71         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
  72
  73         clk_prepare_enable(fsl_dev->pix_clk);
  74         regmap_update_bits(fsl_dev->regmap, DCU_DCU_MODE,
  75                            DCU_MODE_DCU_MODE_MASK,
  76                            DCU_MODE_DCU_MODE(DCU_MODE_NORMAL));
  77         regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE,
  78                      DCU_UPDATE_MODE_READREG);
  79
  80         drm_crtc_vblank_on(crtc);
  81 }
  82
  83 static void fsl_dcu_drm_crtc_mode_set_nofb(struct drm_crtc *crtc)
  84 {
  85         struct drm_device *dev = crtc->dev;
  86         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
  87         struct drm_connector *con = &fsl_dev->connector.base;
  88         struct drm_display_mode *mode = &crtc->state->mode;
  89         unsigned int pol = 0;
  90         struct videomode vm;
  91
  92         clk_set_rate(fsl_dev->pix_clk, mode->clock * 1000);
  93
  94         drm_display_mode_to_videomode(mode, &vm);
  95
  96         /* INV_PXCK as default (most display sample data on rising edge) */
  97         if (!(con->display_info.bus_flags & DRM_BUS_FLAG_PIXDATA_POSEDGE))
  98                 pol |= DCU_SYN_POL_INV_PXCK;
  99
 100         if (vm.flags & DISPLAY_FLAGS_HSYNC_LOW)
 101                 pol |= DCU_SYN_POL_INV_HS_LOW;
 102
 103         if (vm.flags & DISPLAY_FLAGS_VSYNC_LOW)
 104                 pol |= DCU_SYN_POL_INV_VS_LOW;
 105
 106         regmap_write(fsl_dev->regmap, DCU_HSYN_PARA,
 107                      DCU_HSYN_PARA_BP(vm.hback_porch) |
 108                      DCU_HSYN_PARA_PW(vm.hsync_len) |
 109                      DCU_HSYN_PARA_FP(vm.hfront_porch));
 110         regmap_write(fsl_dev->regmap, DCU_VSYN_PARA,
 111                      DCU_VSYN_PARA_BP(vm.vback_porch) |
 112                      DCU_VSYN_PARA_PW(vm.vsync_len) |
 113                      DCU_VSYN_PARA_FP(vm.vfront_porch));
 114         regmap_write(fsl_dev->regmap, DCU_DISP_SIZE,
 115                      DCU_DISP_SIZE_DELTA_Y(vm.vactive) |
 116                      DCU_DISP_SIZE_DELTA_X(vm.hactive));
 117         regmap_write(fsl_dev->regmap, DCU_SYN_POL, pol);
 118         regmap_write(fsl_dev->regmap, DCU_BGND, DCU_BGND_R(0) |
 119                      DCU_BGND_G(0) | DCU_BGND_B(0));
 120         regmap_write(fsl_dev->regmap, DCU_DCU_MODE,
 121                      DCU_MODE_BLEND_ITER(1) | DCU_MODE_RASTER_EN);
 122         regmap_write(fsl_dev->regmap, DCU_THRESHOLD,
 123                      DCU_THRESHOLD_LS_BF_VS(BF_VS_VAL) |
 124                      DCU_THRESHOLD_OUT_BUF_HIGH(BUF_MAX_VAL) |
 125                      DCU_THRESHOLD_OUT_BUF_LOW(BUF_MIN_VAL));
 126         return;
 127 }
 128
 129 static const struct drm_crtc_helper_funcs fsl_dcu_drm_crtc_helper_funcs = {
 130         .atomic_disable = fsl_dcu_drm_crtc_atomic_disable,
 131         .atomic_flush = fsl_dcu_drm_crtc_atomic_flush,
 132         .atomic_enable = fsl_dcu_drm_crtc_atomic_enable,
 133         .mode_set_nofb = fsl_dcu_drm_crtc_mode_set_nofb,
 134 };
 135
 136 static int fsl_dcu_drm_crtc_enable_vblank(struct drm_crtc *crtc)
 137 {
 138         struct drm_device *dev = crtc->dev;
 139         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 140         unsigned int value;
 141
 142         regmap_read(fsl_dev->regmap, DCU_INT_MASK, &value);
 143         value &= ~DCU_INT_MASK_VBLANK;
 144         regmap_write(fsl_dev->regmap, DCU_INT_MASK, value);
 145
 146         return 0;
 147 }
 148
 149 static void fsl_dcu_drm_crtc_disable_vblank(struct drm_crtc *crtc)
 150 {
 151         struct drm_device *dev = crtc->dev;
 152         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 153         unsigned int value;
 154
 155         regmap_read(fsl_dev->regmap, DCU_INT_MASK, &value);
 156         value |= DCU_INT_MASK_VBLANK;
 157         regmap_write(fsl_dev->regmap, DCU_INT_MASK, value);
 158 }
 159
 160 static const struct drm_crtc_funcs fsl_dcu_drm_crtc_funcs = {
 161         .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
 162         .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
 163         .destroy = drm_crtc_cleanup,
 164         .page_flip = drm_atomic_helper_page_flip,
 165         .reset = drm_atomic_helper_crtc_reset,
 166         .set_config = drm_atomic_helper_set_config,
 167         .enable_vblank = fsl_dcu_drm_crtc_enable_vblank,
 168         .disable_vblank = fsl_dcu_drm_crtc_disable_vblank,
 169 };
 170
 171 int fsl_dcu_drm_crtc_create(struct fsl_dcu_drm_device *fsl_dev)
 172 {
 173         struct drm_plane *primary;
 174         struct drm_crtc *crtc = &fsl_dev->crtc;
 175         int ret;
 176
 177         fsl_dcu_drm_init_planes(fsl_dev->drm);
 178
 179         primary = fsl_dcu_drm_primary_create_plane(fsl_dev->drm);
 180         if (!primary)
 181                 return -ENOMEM;
 182
 183         ret = drm_crtc_init_with_planes(fsl_dev->drm, crtc, primary, NULL,
 184                                         &fsl_dcu_drm_crtc_funcs, NULL);
 185         if (ret) {
 186                 primary->funcs->destroy(primary);
 187                 return ret;
 188         }
 189
 190         drm_crtc_helper_add(crtc, &fsl_dcu_drm_crtc_helper_funcs);
 191
 192         return 0;
 193 }