drivers/gpu/drm/shmobile/shmob_drm_kms.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * shmob_drm_kms.c  --  SH Mobile DRM Mode Setting
   4  *
   5  * Copyright (C) 2012 Renesas Electronics Corporation
   6  *
   7  * Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   8  */
   9
  10 #include <drm/drm_crtc.h>
  11 #include <drm/drm_crtc_helper.h>
  12 #include <drm/drm_fb_cma_helper.h>
  13 #include <drm/drm_gem_cma_helper.h>
  14 #include <drm/drm_gem_framebuffer_helper.h>
  15 #include <drm/drm_probe_helper.h>
  16
  17 #include "shmob_drm_crtc.h"
  18 #include "shmob_drm_drv.h"
  19 #include "shmob_drm_kms.h"
  20 #include "shmob_drm_regs.h"
  21
  22 /* -----------------------------------------------------------------------------
  23  * Format helpers
  24  */
  25
  26 static const struct shmob_drm_format_info shmob_drm_format_infos[] = {
  27         {
  28                 .fourcc = DRM_FORMAT_RGB565,
  29                 .bpp = 16,
  30                 .yuv = false,
  31                 .lddfr = LDDFR_PKF_RGB16,
  32         }, {
  33                 .fourcc = DRM_FORMAT_RGB888,
  34                 .bpp = 24,
  35                 .yuv = false,
  36                 .lddfr = LDDFR_PKF_RGB24,
  37         }, {
  38                 .fourcc = DRM_FORMAT_ARGB8888,
  39                 .bpp = 32,
  40                 .yuv = false,
  41                 .lddfr = LDDFR_PKF_ARGB32,
  42         }, {
  43                 .fourcc = DRM_FORMAT_NV12,
  44                 .bpp = 12,
  45                 .yuv = true,
  46                 .lddfr = LDDFR_CC | LDDFR_YF_420,
  47         }, {
  48                 .fourcc = DRM_FORMAT_NV21,
  49                 .bpp = 12,
  50                 .yuv = true,
  51                 .lddfr = LDDFR_CC | LDDFR_YF_420,
  52         }, {
  53                 .fourcc = DRM_FORMAT_NV16,
  54                 .bpp = 16,
  55                 .yuv = true,
  56                 .lddfr = LDDFR_CC | LDDFR_YF_422,
  57         }, {
  58                 .fourcc = DRM_FORMAT_NV61,
  59                 .bpp = 16,
  60                 .yuv = true,
  61                 .lddfr = LDDFR_CC | LDDFR_YF_422,
  62         }, {
  63                 .fourcc = DRM_FORMAT_NV24,
  64                 .bpp = 24,
  65                 .yuv = true,
  66                 .lddfr = LDDFR_CC | LDDFR_YF_444,
  67         }, {
  68                 .fourcc = DRM_FORMAT_NV42,
  69                 .bpp = 24,
  70                 .yuv = true,
  71                 .lddfr = LDDFR_CC | LDDFR_YF_444,
  72         },
  73 };
  74
  75 const struct shmob_drm_format_info *shmob_drm_format_info(u32 fourcc)
  76 {
  77         unsigned int i;
  78
  79         for (i = 0; i < ARRAY_SIZE(shmob_drm_format_infos); ++i) {
  80                 if (shmob_drm_format_infos[i].fourcc == fourcc)
  81                         return &shmob_drm_format_infos[i];
  82         }
  83
  84         return NULL;
  85 }
  86
  87 /* -----------------------------------------------------------------------------
  88  * Frame buffer
  89  */
  90
  91 static struct drm_framebuffer *
  92 shmob_drm_fb_create(struct drm_device *dev, struct drm_file *file_priv,
  93                     const struct drm_mode_fb_cmd2 *mode_cmd)
  94 {
  95         const struct shmob_drm_format_info *format;
  96
  97         format = shmob_drm_format_info(mode_cmd->pixel_format);
  98         if (format == NULL) {
  99                 dev_dbg(dev->dev, "unsupported pixel format %08x\n",
 100                         mode_cmd->pixel_format);
 101                 return ERR_PTR(-EINVAL);
 102         }
 103
 104         if (mode_cmd->pitches[0] & 7 || mode_cmd->pitches[0] >= 65536) {
 105                 dev_dbg(dev->dev, "invalid pitch value %u\n",
 106                         mode_cmd->pitches[0]);
 107                 return ERR_PTR(-EINVAL);
 108         }
 109
 110         if (format->yuv) {
 111                 unsigned int chroma_cpp = format->bpp == 24 ? 2 : 1;
 112
 113                 if (mode_cmd->pitches[1] != mode_cmd->pitches[0] * chroma_cpp) {
 114                         dev_dbg(dev->dev,
 115                                 "luma and chroma pitches do not match\n");
 116                         return ERR_PTR(-EINVAL);
 117                 }
 118         }
 119
 120         return drm_gem_fb_create(dev, file_priv, mode_cmd);
 121 }
 122
 123 static const struct drm_mode_config_funcs shmob_drm_mode_config_funcs = {
 124         .fb_create = shmob_drm_fb_create,
 125 };
 126
 127 int shmob_drm_modeset_init(struct shmob_drm_device *sdev)
 128 {
 129         int ret;
 130
 131         ret = drmm_mode_config_init(sdev->ddev);
 132         if (ret)
 133                 return ret;
 134
 135         shmob_drm_crtc_create(sdev);
 136         shmob_drm_encoder_create(sdev);
 137         shmob_drm_connector_create(sdev, &sdev->encoder.encoder);
 138
 139         drm_kms_helper_poll_init(sdev->ddev);
 140
 141         sdev->ddev->mode_config.min_width = 0;
 142         sdev->ddev->mode_config.min_height = 0;
 143         sdev->ddev->mode_config.max_width = 4095;
 144         sdev->ddev->mode_config.max_height = 4095;
 145         sdev->ddev->mode_config.funcs = &shmob_drm_mode_config_funcs;
 146
 147         drm_helper_disable_unused_functions(sdev->ddev);
 148
 149         return 0;
 150 }