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_flush(struct drm_crtc *crtc,
  26                                           struct drm_crtc_state *old_crtc_state)
  27 {
  28         struct drm_device *dev = crtc->dev;
  29         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
  30         struct drm_pending_vblank_event *event = crtc->state->event;
  31
  32         regmap_write(fsl_dev->regmap,
  33                      DCU_UPDATE_MODE, DCU_UPDATE_MODE_READREG);
  34
  35         if (event) {
  36                 crtc->state->event = NULL;
  37
  38                 spin_lock_irq(&crtc->dev->event_lock);
  39                 if (drm_crtc_vblank_get(crtc) == 0)
  40                         drm_crtc_arm_vblank_event(crtc, event);
  41                 else
  42                         drm_crtc_send_vblank_event(crtc, event);
  43                 spin_unlock_irq(&crtc->dev->event_lock);
  44         }
  45 }
  46
  47 static void fsl_dcu_drm_crtc_atomic_disable(struct drm_crtc *crtc,
  48                                         struct drm_crtc_state *old_crtc_state)
  49 {
  50         struct drm_device *dev = crtc->dev;
  51         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
  52
  53         /* always disable planes on the CRTC */
  54         drm_atomic_helper_disable_planes_on_crtc(old_crtc_state, true);
  55
  56         drm_crtc_vblank_off(crtc);
  57
  58         regmap_update_bits(fsl_dev->regmap, DCU_DCU_MODE,
  59                            DCU_MODE_DCU_MODE_MASK,
  60                            DCU_MODE_DCU_MODE(DCU_MODE_OFF));
  61         regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE,
  62                      DCU_UPDATE_MODE_READREG);
  63         clk_disable_unprepare(fsl_dev->pix_clk);
  64 }
  65
  66 static void fsl_dcu_drm_crtc_atomic_enable(struct drm_crtc *crtc,
  67                                            struct drm_crtc_state *old_state)
  68 {
  69         struct drm_device *dev = crtc->dev;
  70         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
  71
  72         clk_prepare_enable(fsl_dev->pix_clk);
  73         regmap_update_bits(fsl_dev->regmap, DCU_DCU_MODE,
  74                            DCU_MODE_DCU_MODE_MASK,
  75                            DCU_MODE_DCU_MODE(DCU_MODE_NORMAL));
  76         regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE,
  77                      DCU_UPDATE_MODE_READREG);
  78
  79         drm_crtc_vblank_on(crtc);
  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_connector *con = &fsl_dev->connector.base;
  87         struct drm_display_mode *mode = &crtc->state->mode;
  88         unsigned int hbp, hfp, hsw, vbp, vfp, vsw, index, pol = 0;
  89
  90         index = drm_crtc_index(crtc);
  91         clk_set_rate(fsl_dev->pix_clk, mode->clock * 1000);
  92
  93         /* Configure timings: */
  94         hbp = mode->htotal - mode->hsync_end;
  95         hfp = mode->hsync_start - mode->hdisplay;
  96         hsw = mode->hsync_end - mode->hsync_start;
  97         vbp = mode->vtotal - mode->vsync_end;
  98         vfp = mode->vsync_start - mode->vdisplay;
  99         vsw = mode->vsync_end - mode->vsync_start;
 100
 101         /* INV_PXCK as default (most display sample data on rising edge) */
 102         if (!(con->display_info.bus_flags & DRM_BUS_FLAG_PIXDATA_POSEDGE))
 103                 pol |= DCU_SYN_POL_INV_PXCK;
 104
 105         if (mode->flags & DRM_MODE_FLAG_NHSYNC)
 106                 pol |= DCU_SYN_POL_INV_HS_LOW;
 107
 108         if (mode->flags & DRM_MODE_FLAG_NVSYNC)
 109                 pol |= DCU_SYN_POL_INV_VS_LOW;
 110
 111         regmap_write(fsl_dev->regmap, DCU_HSYN_PARA,
 112                      DCU_HSYN_PARA_BP(hbp) |
 113                      DCU_HSYN_PARA_PW(hsw) |
 114                      DCU_HSYN_PARA_FP(hfp));
 115         regmap_write(fsl_dev->regmap, DCU_VSYN_PARA,
 116                      DCU_VSYN_PARA_BP(vbp) |
 117                      DCU_VSYN_PARA_PW(vsw) |
 118                      DCU_VSYN_PARA_FP(vfp));
 119         regmap_write(fsl_dev->regmap, DCU_DISP_SIZE,
 120                      DCU_DISP_SIZE_DELTA_Y(mode->vdisplay) |
 121                      DCU_DISP_SIZE_DELTA_X(mode->hdisplay));
 122         regmap_write(fsl_dev->regmap, DCU_SYN_POL, pol);
 123         regmap_write(fsl_dev->regmap, DCU_BGND, DCU_BGND_R(0) |
 124                      DCU_BGND_G(0) | DCU_BGND_B(0));
 125         regmap_write(fsl_dev->regmap, DCU_DCU_MODE,
 126                      DCU_MODE_BLEND_ITER(1) | DCU_MODE_RASTER_EN);
 127         regmap_write(fsl_dev->regmap, DCU_THRESHOLD,
 128                      DCU_THRESHOLD_LS_BF_VS(BF_VS_VAL) |
 129                      DCU_THRESHOLD_OUT_BUF_HIGH(BUF_MAX_VAL) |
 130                      DCU_THRESHOLD_OUT_BUF_LOW(BUF_MIN_VAL));
 131         return;
 132 }
 133
 134 static const struct drm_crtc_helper_funcs fsl_dcu_drm_crtc_helper_funcs = {
 135         .atomic_disable = fsl_dcu_drm_crtc_atomic_disable,
 136         .atomic_flush = fsl_dcu_drm_crtc_atomic_flush,
 137         .atomic_enable = fsl_dcu_drm_crtc_atomic_enable,
 138         .mode_set_nofb = fsl_dcu_drm_crtc_mode_set_nofb,
 139 };
 140
 141 static int fsl_dcu_drm_crtc_enable_vblank(struct drm_crtc *crtc)
 142 {
 143         struct drm_device *dev = crtc->dev;
 144         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 145         unsigned int value;
 146
 147         regmap_read(fsl_dev->regmap, DCU_INT_MASK, &value);
 148         value &= ~DCU_INT_MASK_VBLANK;
 149         regmap_write(fsl_dev->regmap, DCU_INT_MASK, value);
 150
 151         return 0;
 152 }
 153
 154 static void fsl_dcu_drm_crtc_disable_vblank(struct drm_crtc *crtc)
 155 {
 156         struct drm_device *dev = crtc->dev;
 157         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 158         unsigned int value;
 159
 160         regmap_read(fsl_dev->regmap, DCU_INT_MASK, &value);
 161         value |= DCU_INT_MASK_VBLANK;
 162         regmap_write(fsl_dev->regmap, DCU_INT_MASK, value);
 163 }
 164
 165 static const struct drm_crtc_funcs fsl_dcu_drm_crtc_funcs = {
 166         .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
 167         .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
 168         .destroy = drm_crtc_cleanup,
 169         .page_flip = drm_atomic_helper_page_flip,
 170         .reset = drm_atomic_helper_crtc_reset,
 171         .set_config = drm_atomic_helper_set_config,
 172         .enable_vblank = fsl_dcu_drm_crtc_enable_vblank,
 173         .disable_vblank = fsl_dcu_drm_crtc_disable_vblank,
 174 };
 175
 176 int fsl_dcu_drm_crtc_create(struct fsl_dcu_drm_device *fsl_dev)
 177 {
 178         struct drm_plane *primary;
 179         struct drm_crtc *crtc = &fsl_dev->crtc;
 180         int ret;
 181
 182         fsl_dcu_drm_init_planes(fsl_dev->drm);
 183
 184         primary = fsl_dcu_drm_primary_create_plane(fsl_dev->drm);
 185         if (!primary)
 186                 return -ENOMEM;
 187
 188         ret = drm_crtc_init_with_planes(fsl_dev->drm, crtc, primary, NULL,
 189                                         &fsl_dcu_drm_crtc_funcs, NULL);
 190         if (ret) {
 191                 primary->funcs->destroy(primary);
 192                 return ret;
 193         }
 194
 195         drm_crtc_helper_add(crtc, &fsl_dcu_drm_crtc_helper_funcs);
 196
 197         return 0;
 198 }