kernel/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
  21 #include "fsl_dcu_drm_crtc.h"
  22 #include "fsl_dcu_drm_drv.h"
  23 #include "fsl_dcu_drm_plane.h"
  24
  25 static void fsl_dcu_drm_crtc_atomic_begin(struct drm_crtc *crtc,
  26                                           struct drm_crtc_state *old_crtc_state)
  27 {
  28 }
  29
  30 static int fsl_dcu_drm_crtc_atomic_check(struct drm_crtc *crtc,
  31                                          struct drm_crtc_state *state)
  32 {
  33         return 0;
  34 }
  35
  36 static void fsl_dcu_drm_crtc_atomic_flush(struct drm_crtc *crtc,
  37                                           struct drm_crtc_state *old_crtc_state)
  38 {
  39 }
  40
  41 static void fsl_dcu_drm_disable_crtc(struct drm_crtc *crtc)
  42 {
  43         struct drm_device *dev = crtc->dev;
  44         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
  45         int ret;
  46
  47         ret = regmap_update_bits(fsl_dev->regmap, DCU_DCU_MODE,
  48                                  DCU_MODE_DCU_MODE_MASK,
  49                                  DCU_MODE_DCU_MODE(DCU_MODE_OFF));
  50         if (ret)
  51                 dev_err(fsl_dev->dev, "Disable CRTC failed\n");
  52         ret = regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE,
  53                            DCU_UPDATE_MODE_READREG);
  54         if (ret)
  55                 dev_err(fsl_dev->dev, "Enable CRTC failed\n");
  56 }
  57
  58 static void fsl_dcu_drm_crtc_enable(struct drm_crtc *crtc)
  59 {
  60         struct drm_device *dev = crtc->dev;
  61         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
  62         int ret;
  63
  64         ret = regmap_update_bits(fsl_dev->regmap, DCU_DCU_MODE,
  65                                  DCU_MODE_DCU_MODE_MASK,
  66                                  DCU_MODE_DCU_MODE(DCU_MODE_NORMAL));
  67         if (ret)
  68                 dev_err(fsl_dev->dev, "Enable CRTC failed\n");
  69         ret = regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE,
  70                            DCU_UPDATE_MODE_READREG);
  71         if (ret)
  72                 dev_err(fsl_dev->dev, "Enable CRTC failed\n");
  73 }
  74
  75 static bool fsl_dcu_drm_crtc_mode_fixup(struct drm_crtc *crtc,
  76                                         const struct drm_display_mode *mode,
  77                                         struct drm_display_mode *adjusted_mode)
  78 {
  79         return true;
  80 }
  81
  82 static void fsl_dcu_drm_crtc_mode_set_nofb(struct drm_crtc *crtc)
  83 {
  84         struct drm_device *dev = crtc->dev;
  85         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
  86         struct drm_display_mode *mode = &crtc->state->mode;
  87         unsigned int hbp, hfp, hsw, vbp, vfp, vsw, div, index;
  88         unsigned long dcuclk;
  89         int ret;
  90
  91         index = drm_crtc_index(crtc);
  92         dcuclk = clk_get_rate(fsl_dev->clk);
  93         div = dcuclk / mode->clock / 1000;
  94
  95         /* Configure timings: */
  96         hbp = mode->htotal - mode->hsync_end;
  97         hfp = mode->hsync_start - mode->hdisplay;
  98         hsw = mode->hsync_end - mode->hsync_start;
  99         vbp = mode->vtotal - mode->vsync_end;
 100         vfp = mode->vsync_start - mode->vdisplay;
 101         vsw = mode->vsync_end - mode->vsync_start;
 102
 103         ret = regmap_write(fsl_dev->regmap, DCU_HSYN_PARA,
 104                            DCU_HSYN_PARA_BP(hbp) |
 105                            DCU_HSYN_PARA_PW(hsw) |
 106                            DCU_HSYN_PARA_FP(hfp));
 107         if (ret)
 108                 goto set_failed;
 109         ret = regmap_write(fsl_dev->regmap, DCU_VSYN_PARA,
 110                            DCU_VSYN_PARA_BP(vbp) |
 111                            DCU_VSYN_PARA_PW(vsw) |
 112                            DCU_VSYN_PARA_FP(vfp));
 113         if (ret)
 114                 goto set_failed;
 115         ret = regmap_write(fsl_dev->regmap, DCU_DISP_SIZE,
 116                            DCU_DISP_SIZE_DELTA_Y(mode->vdisplay) |
 117                            DCU_DISP_SIZE_DELTA_X(mode->hdisplay));
 118         if (ret)
 119                 goto set_failed;
 120         ret = regmap_write(fsl_dev->regmap, DCU_DIV_RATIO, div);
 121         if (ret)
 122                 goto set_failed;
 123         ret = regmap_write(fsl_dev->regmap, DCU_SYN_POL,
 124                            DCU_SYN_POL_INV_VS_LOW | DCU_SYN_POL_INV_HS_LOW);
 125         if (ret)
 126                 goto set_failed;
 127         ret = regmap_write(fsl_dev->regmap, DCU_BGND, DCU_BGND_R(0) |
 128                            DCU_BGND_G(0) | DCU_BGND_B(0));
 129         if (ret)
 130                 goto set_failed;
 131         ret = regmap_write(fsl_dev->regmap, DCU_DCU_MODE,
 132                            DCU_MODE_BLEND_ITER(1) | DCU_MODE_RASTER_EN);
 133         if (ret)
 134                 goto set_failed;
 135         ret = regmap_write(fsl_dev->regmap, DCU_THRESHOLD,
 136                            DCU_THRESHOLD_LS_BF_VS(BF_VS_VAL) |
 137                            DCU_THRESHOLD_OUT_BUF_HIGH(BUF_MAX_VAL) |
 138                            DCU_THRESHOLD_OUT_BUF_LOW(BUF_MIN_VAL));
 139         if (ret)
 140                 goto set_failed;
 141         ret = regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE,
 142                            DCU_UPDATE_MODE_READREG);
 143         if (ret)
 144                 goto set_failed;
 145         return;
 146 set_failed:
 147         dev_err(dev->dev, "set DCU register failed\n");
 148 }
 149
 150 static const struct drm_crtc_helper_funcs fsl_dcu_drm_crtc_helper_funcs = {
 151         .atomic_begin = fsl_dcu_drm_crtc_atomic_begin,
 152         .atomic_check = fsl_dcu_drm_crtc_atomic_check,
 153         .atomic_flush = fsl_dcu_drm_crtc_atomic_flush,
 154         .disable = fsl_dcu_drm_disable_crtc,
 155         .enable = fsl_dcu_drm_crtc_enable,
 156         .mode_fixup = fsl_dcu_drm_crtc_mode_fixup,
 157         .mode_set_nofb = fsl_dcu_drm_crtc_mode_set_nofb,
 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 };
 168
 169 int fsl_dcu_drm_crtc_create(struct fsl_dcu_drm_device *fsl_dev)
 170 {
 171         struct drm_plane *primary;
 172         struct drm_crtc *crtc = &fsl_dev->crtc;
 173         unsigned int i, j, reg_num;
 174         int ret;
 175
 176         primary = fsl_dcu_drm_primary_create_plane(fsl_dev->drm);
 177         ret = drm_crtc_init_with_planes(fsl_dev->drm, crtc, primary, NULL,
 178                                         &fsl_dcu_drm_crtc_funcs);
 179         if (ret < 0)
 180                 return ret;
 181
 182         drm_crtc_helper_add(crtc, &fsl_dcu_drm_crtc_helper_funcs);
 183
 184         if (!strcmp(fsl_dev->soc->name, "ls1021a"))
 185                 reg_num = LS1021A_LAYER_REG_NUM;
 186         else
 187                 reg_num = VF610_LAYER_REG_NUM;
 188         for (i = 0; i <= fsl_dev->soc->total_layer; i++) {
 189                 for (j = 0; j < reg_num; j++) {
 190                         ret = regmap_write(fsl_dev->regmap,
 191                                            DCU_CTRLDESCLN(i, j), 0);
 192                         if (ret)
 193                                 goto init_failed;
 194                 }
 195         }
 196         ret = regmap_update_bits(fsl_dev->regmap, DCU_DCU_MODE,
 197                                  DCU_MODE_DCU_MODE_MASK,
 198                                  DCU_MODE_DCU_MODE(DCU_MODE_OFF));
 199         if (ret)
 200                 goto init_failed;
 201         ret = regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE,
 202                            DCU_UPDATE_MODE_READREG);
 203         if (ret)
 204                 goto init_failed;
 205
 206         return 0;
 207 init_failed:
 208         dev_err(fsl_dev->dev, "init DCU register failed\n");
 209         return ret;
 210 }