kernel/drivers/gpu/drm/shmobile/shmob_drm_kms.c

   1 /*
   2  * shmob_drm_kms.c  --  SH Mobile DRM Mode Setting
   3  *
   4  * Copyright (C) 2012 Renesas Electronics Corporation
   5  *
   6  * Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  */
  13
  14 #include <drm/drmP.h>
  15 #include <drm/drm_crtc.h>
  16 #include <drm/drm_crtc_helper.h>
  17 #include <drm/drm_fb_cma_helper.h>
  18 #include <drm/drm_gem_cma_helper.h>
  19
  20 #include <video/sh_mobile_meram.h>
  21
  22 #include "shmob_drm_crtc.h"
  23 #include "shmob_drm_drv.h"
  24 #include "shmob_drm_kms.h"
  25 #include "shmob_drm_regs.h"
  26
  27 /* -----------------------------------------------------------------------------
  28  * Format helpers
  29  */
  30
  31 static const struct shmob_drm_format_info shmob_drm_format_infos[] = {
  32         {
  33                 .fourcc = DRM_FORMAT_RGB565,
  34                 .bpp = 16,
  35                 .yuv = false,
  36                 .lddfr = LDDFR_PKF_RGB16,
  37                 .meram = SH_MOBILE_MERAM_PF_RGB,
  38         }, {
  39                 .fourcc = DRM_FORMAT_RGB888,
  40                 .bpp = 24,
  41                 .yuv = false,
  42                 .lddfr = LDDFR_PKF_RGB24,
  43                 .meram = SH_MOBILE_MERAM_PF_RGB,
  44         }, {
  45                 .fourcc = DRM_FORMAT_ARGB8888,
  46                 .bpp = 32,
  47                 .yuv = false,
  48                 .lddfr = LDDFR_PKF_ARGB32,
  49                 .meram = SH_MOBILE_MERAM_PF_RGB,
  50         }, {
  51                 .fourcc = DRM_FORMAT_NV12,
  52                 .bpp = 12,
  53                 .yuv = true,
  54                 .lddfr = LDDFR_CC | LDDFR_YF_420,
  55                 .meram = SH_MOBILE_MERAM_PF_NV,
  56         }, {
  57                 .fourcc = DRM_FORMAT_NV21,
  58                 .bpp = 12,
  59                 .yuv = true,
  60                 .lddfr = LDDFR_CC | LDDFR_YF_420,
  61                 .meram = SH_MOBILE_MERAM_PF_NV,
  62         }, {
  63                 .fourcc = DRM_FORMAT_NV16,
  64                 .bpp = 16,
  65                 .yuv = true,
  66                 .lddfr = LDDFR_CC | LDDFR_YF_422,
  67                 .meram = SH_MOBILE_MERAM_PF_NV,
  68         }, {
  69                 .fourcc = DRM_FORMAT_NV61,
  70                 .bpp = 16,
  71                 .yuv = true,
  72                 .lddfr = LDDFR_CC | LDDFR_YF_422,
  73                 .meram = SH_MOBILE_MERAM_PF_NV,
  74         }, {
  75                 .fourcc = DRM_FORMAT_NV24,
  76                 .bpp = 24,
  77                 .yuv = true,
  78                 .lddfr = LDDFR_CC | LDDFR_YF_444,
  79                 .meram = SH_MOBILE_MERAM_PF_NV24,
  80         }, {
  81                 .fourcc = DRM_FORMAT_NV42,
  82                 .bpp = 24,
  83                 .yuv = true,
  84                 .lddfr = LDDFR_CC | LDDFR_YF_444,
  85                 .meram = SH_MOBILE_MERAM_PF_NV24,
  86         },
  87 };
  88
  89 const struct shmob_drm_format_info *shmob_drm_format_info(u32 fourcc)
  90 {
  91         unsigned int i;
  92
  93         for (i = 0; i < ARRAY_SIZE(shmob_drm_format_infos); ++i) {
  94                 if (shmob_drm_format_infos[i].fourcc == fourcc)
  95                         return &shmob_drm_format_infos[i];
  96         }
  97
  98         return NULL;
  99 }
 100
 101 /* -----------------------------------------------------------------------------
 102  * Frame buffer
 103  */
 104
 105 static struct drm_framebuffer *
 106 shmob_drm_fb_create(struct drm_device *dev, struct drm_file *file_priv,
 107                     struct drm_mode_fb_cmd2 *mode_cmd)
 108 {
 109         const struct shmob_drm_format_info *format;
 110
 111         format = shmob_drm_format_info(mode_cmd->pixel_format);
 112         if (format == NULL) {
 113                 dev_dbg(dev->dev, "unsupported pixel format %08x\n",
 114                         mode_cmd->pixel_format);
 115                 return ERR_PTR(-EINVAL);
 116         }
 117
 118         if (mode_cmd->pitches[0] & 7 || mode_cmd->pitches[0] >= 65536) {
 119                 dev_dbg(dev->dev, "invalid pitch value %u\n",
 120                         mode_cmd->pitches[0]);
 121                 return ERR_PTR(-EINVAL);
 122         }
 123
 124         if (format->yuv) {
 125                 unsigned int chroma_cpp = format->bpp == 24 ? 2 : 1;
 126
 127                 if (mode_cmd->pitches[1] != mode_cmd->pitches[0] * chroma_cpp) {
 128                         dev_dbg(dev->dev,
 129                                 "luma and chroma pitches do not match\n");
 130                         return ERR_PTR(-EINVAL);
 131                 }
 132         }
 133
 134         return drm_fb_cma_create(dev, file_priv, mode_cmd);
 135 }
 136
 137 static const struct drm_mode_config_funcs shmob_drm_mode_config_funcs = {
 138         .fb_create = shmob_drm_fb_create,
 139 };
 140
 141 int shmob_drm_modeset_init(struct shmob_drm_device *sdev)
 142 {
 143         drm_mode_config_init(sdev->ddev);
 144
 145         shmob_drm_crtc_create(sdev);
 146         shmob_drm_encoder_create(sdev);
 147         shmob_drm_connector_create(sdev, &sdev->encoder.encoder);
 148
 149         drm_kms_helper_poll_init(sdev->ddev);
 150
 151         sdev->ddev->mode_config.min_width = 0;
 152         sdev->ddev->mode_config.min_height = 0;
 153         sdev->ddev->mode_config.max_width = 4095;
 154         sdev->ddev->mode_config.max_height = 4095;
 155         sdev->ddev->mode_config.funcs = &shmob_drm_mode_config_funcs;
 156
 157         drm_helper_disable_unused_functions(sdev->ddev);
 158
 159         return 0;
 160 }