drivers/gpu/drm/arm/malidp_crtc.c

   1 /*
   2  * (C) COPYRIGHT 2016 ARM Limited. All rights reserved.
   3  * Author: Liviu Dudau <Liviu.Dudau@arm.com>
   4  *
   5  * This program is free software and is provided to you under the terms of the
   6  * GNU General Public License version 2 as published by the Free Software
   7  * Foundation, and any use by you of this program is subject to the terms
   8  * of such GNU licence.
   9  *
  10  * ARM Mali DP500/DP550/DP650 driver (crtc operations)
  11  */
  12
  13 #include <drm/drmP.h>
  14 #include <drm/drm_atomic.h>
  15 #include <drm/drm_atomic_helper.h>
  16 #include <drm/drm_crtc.h>
  17 #include <drm/drm_crtc_helper.h>
  18 #include <linux/clk.h>
  19 #include <video/videomode.h>
  20
  21 #include "malidp_drv.h"
  22 #include "malidp_hw.h"
  23
  24 static bool malidp_crtc_mode_fixup(struct drm_crtc *crtc,
  25                                    const struct drm_display_mode *mode,
  26                                    struct drm_display_mode *adjusted_mode)
  27 {
  28         struct malidp_drm *malidp = crtc_to_malidp_device(crtc);
  29         struct malidp_hw_device *hwdev = malidp->dev;
  30
  31         /*
  32          * check that the hardware can drive the required clock rate,
  33          * but skip the check if the clock is meant to be disabled (req_rate = 0)
  34          */
  35         long rate, req_rate = mode->crtc_clock * 1000;
  36
  37         if (req_rate) {
  38                 rate = clk_round_rate(hwdev->mclk, req_rate);
  39                 if (rate < req_rate) {
  40                         DRM_DEBUG_DRIVER("mclk clock unable to reach %d kHz\n",
  41                                          mode->crtc_clock);
  42                         return false;
  43                 }
  44
  45                 rate = clk_round_rate(hwdev->pxlclk, req_rate);
  46                 if (rate != req_rate) {
  47                         DRM_DEBUG_DRIVER("pxlclk doesn't support %ld Hz\n",
  48                                          req_rate);
  49                         return false;
  50                 }
  51         }
  52
  53         return true;
  54 }
  55
  56 static void malidp_crtc_enable(struct drm_crtc *crtc)
  57 {
  58         struct malidp_drm *malidp = crtc_to_malidp_device(crtc);
  59         struct malidp_hw_device *hwdev = malidp->dev;
  60         struct videomode vm;
  61
  62         drm_display_mode_to_videomode(&crtc->state->adjusted_mode, &vm);
  63
  64         clk_prepare_enable(hwdev->pxlclk);
  65
  66         /* We rely on firmware to set mclk to a sensible level. */
  67         clk_set_rate(hwdev->pxlclk, crtc->state->adjusted_mode.crtc_clock * 1000);
  68
  69         hwdev->modeset(hwdev, &vm);
  70         hwdev->leave_config_mode(hwdev);
  71         drm_crtc_vblank_on(crtc);
  72 }
  73
  74 static void malidp_crtc_disable(struct drm_crtc *crtc)
  75 {
  76         struct malidp_drm *malidp = crtc_to_malidp_device(crtc);
  77         struct malidp_hw_device *hwdev = malidp->dev;
  78
  79         drm_crtc_vblank_off(crtc);
  80         hwdev->enter_config_mode(hwdev);
  81         clk_disable_unprepare(hwdev->pxlclk);
  82 }
  83
  84 static int malidp_crtc_atomic_check(struct drm_crtc *crtc,
  85                                     struct drm_crtc_state *state)
  86 {
  87         struct malidp_drm *malidp = crtc_to_malidp_device(crtc);
  88         struct malidp_hw_device *hwdev = malidp->dev;
  89         struct drm_plane *plane;
  90         const struct drm_plane_state *pstate;
  91         u32 rot_mem_free, rot_mem_usable;
  92         int rotated_planes = 0;
  93
  94         /*
  95          * check if there is enough rotation memory available for planes
  96          * that need 90° and 270° rotation. Each plane has set its required
  97          * memory size in the ->plane_check() callback, here we only make
  98          * sure that the sums are less that the total usable memory.
  99          *
 100          * The rotation memory allocation algorithm (for each plane):
 101          *  a. If no more rotated planes exist, all remaining rotate
 102          *     memory in the bank is available for use by the plane.
 103          *  b. If other rotated planes exist, and plane's layer ID is
 104          *     DE_VIDEO1, it can use all the memory from first bank if
 105          *     secondary rotation memory bank is available, otherwise it can
 106          *     use up to half the bank's memory.
 107          *  c. If other rotated planes exist, and plane's layer ID is not
 108          *     DE_VIDEO1, it can use half of the available memory
 109          *
 110          * Note: this algorithm assumes that the order in which the planes are
 111          * checked always has DE_VIDEO1 plane first in the list if it is
 112          * rotated. Because that is how we create the planes in the first
 113          * place, under current DRM version things work, but if ever the order
 114          * in which drm_atomic_crtc_state_for_each_plane() iterates over planes
 115          * changes, we need to pre-sort the planes before validation.
 116          */
 117
 118         /* first count the number of rotated planes */
 119         drm_atomic_crtc_state_for_each_plane_state(plane, pstate, state) {
 120                 if (pstate->rotation & MALIDP_ROTATED_MASK)
 121                         rotated_planes++;
 122         }
 123
 124         rot_mem_free = hwdev->rotation_memory[0];
 125         /*
 126          * if we have more than 1 plane using rotation memory, use the second
 127          * block of rotation memory as well
 128          */
 129         if (rotated_planes > 1)
 130                 rot_mem_free += hwdev->rotation_memory[1];
 131
 132         /* now validate the rotation memory requirements */
 133         drm_atomic_crtc_state_for_each_plane_state(plane, pstate, state) {
 134                 struct malidp_plane *mp = to_malidp_plane(plane);
 135                 struct malidp_plane_state *ms = to_malidp_plane_state(pstate);
 136
 137                 if (pstate->rotation & MALIDP_ROTATED_MASK) {
 138                         /* process current plane */
 139                         rotated_planes--;
 140
 141                         if (!rotated_planes) {
 142                                 /* no more rotated planes, we can use what's left */
 143                                 rot_mem_usable = rot_mem_free;
 144                         } else {
 145                                 if ((mp->layer->id != DE_VIDEO1) ||
 146                                     (hwdev->rotation_memory[1] == 0))
 147                                         rot_mem_usable = rot_mem_free / 2;
 148                                 else
 149                                         rot_mem_usable = hwdev->rotation_memory[0];
 150                         }
 151
 152                         rot_mem_free -= rot_mem_usable;
 153
 154                         if (ms->rotmem_size > rot_mem_usable)
 155                                 return -EINVAL;
 156                 }
 157         }
 158
 159         return 0;
 160 }
 161
 162 static const struct drm_crtc_helper_funcs malidp_crtc_helper_funcs = {
 163         .mode_fixup = malidp_crtc_mode_fixup,
 164         .enable = malidp_crtc_enable,
 165         .disable = malidp_crtc_disable,
 166         .atomic_check = malidp_crtc_atomic_check,
 167 };
 168
 169 static const struct drm_crtc_funcs malidp_crtc_funcs = {
 170         .destroy = drm_crtc_cleanup,
 171         .set_config = drm_atomic_helper_set_config,
 172         .page_flip = drm_atomic_helper_page_flip,
 173         .reset = drm_atomic_helper_crtc_reset,
 174         .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
 175         .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
 176 };
 177
 178 int malidp_crtc_init(struct drm_device *drm)
 179 {
 180         struct malidp_drm *malidp = drm->dev_private;
 181         struct drm_plane *primary = NULL, *plane;
 182         int ret;
 183
 184         ret = malidp_de_planes_init(drm);
 185         if (ret < 0) {
 186                 DRM_ERROR("Failed to initialise planes\n");
 187                 return ret;
 188         }
 189
 190         drm_for_each_plane(plane, drm) {
 191                 if (plane->type == DRM_PLANE_TYPE_PRIMARY) {
 192                         primary = plane;
 193                         break;
 194                 }
 195         }
 196
 197         if (!primary) {
 198                 DRM_ERROR("no primary plane found\n");
 199                 ret = -EINVAL;
 200                 goto crtc_cleanup_planes;
 201         }
 202
 203         ret = drm_crtc_init_with_planes(drm, &malidp->crtc, primary, NULL,
 204                                         &malidp_crtc_funcs, NULL);
 205
 206         if (!ret) {
 207                 drm_crtc_helper_add(&malidp->crtc, &malidp_crtc_helper_funcs);
 208                 return 0;
 209         }
 210
 211 crtc_cleanup_planes:
 212         malidp_de_planes_destroy(drm);
 213
 214         return ret;
 215 }