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 #include <drm/drm_gem_framebuffer_helper.h>
  20
  21 #include "shmob_drm_crtc.h"
  22 #include "shmob_drm_drv.h"
  23 #include "shmob_drm_kms.h"
  24 #include "shmob_drm_regs.h"
  25
  26 /* -----------------------------------------------------------------------------
  27  * Format helpers
  28  */
  29
  30 static const struct shmob_drm_format_info shmob_drm_format_infos[] = {
  31         {
  32                 .fourcc = DRM_FORMAT_RGB565,
  33                 .bpp = 16,
  34                 .yuv = false,
  35                 .lddfr = LDDFR_PKF_RGB16,
  36         }, {
  37                 .fourcc = DRM_FORMAT_RGB888,
  38                 .bpp = 24,
  39                 .yuv = false,
  40                 .lddfr = LDDFR_PKF_RGB24,
  41         }, {
  42                 .fourcc = DRM_FORMAT_ARGB8888,
  43                 .bpp = 32,
  44                 .yuv = false,
  45                 .lddfr = LDDFR_PKF_ARGB32,
  46         }, {
  47                 .fourcc = DRM_FORMAT_NV12,
  48                 .bpp = 12,
  49                 .yuv = true,
  50                 .lddfr = LDDFR_CC | LDDFR_YF_420,
  51         }, {
  52                 .fourcc = DRM_FORMAT_NV21,
  53                 .bpp = 12,
  54                 .yuv = true,
  55                 .lddfr = LDDFR_CC | LDDFR_YF_420,
  56         }, {
  57                 .fourcc = DRM_FORMAT_NV16,
  58                 .bpp = 16,
  59                 .yuv = true,
  60                 .lddfr = LDDFR_CC | LDDFR_YF_422,
  61         }, {
  62                 .fourcc = DRM_FORMAT_NV61,
  63                 .bpp = 16,
  64                 .yuv = true,
  65                 .lddfr = LDDFR_CC | LDDFR_YF_422,
  66         }, {
  67                 .fourcc = DRM_FORMAT_NV24,
  68                 .bpp = 24,
  69                 .yuv = true,
  70                 .lddfr = LDDFR_CC | LDDFR_YF_444,
  71         }, {
  72                 .fourcc = DRM_FORMAT_NV42,
  73                 .bpp = 24,
  74                 .yuv = true,
  75                 .lddfr = LDDFR_CC | LDDFR_YF_444,
  76         },
  77 };
  78
  79 const struct shmob_drm_format_info *shmob_drm_format_info(u32 fourcc)
  80 {
  81         unsigned int i;
  82
  83         for (i = 0; i < ARRAY_SIZE(shmob_drm_format_infos); ++i) {
  84                 if (shmob_drm_format_infos[i].fourcc == fourcc)
  85                         return &shmob_drm_format_infos[i];
  86         }
  87
  88         return NULL;
  89 }
  90
  91 /* -----------------------------------------------------------------------------
  92  * Frame buffer
  93  */
  94
  95 static struct drm_framebuffer *
  96 shmob_drm_fb_create(struct drm_device *dev, struct drm_file *file_priv,
  97                     const struct drm_mode_fb_cmd2 *mode_cmd)
  98 {
  99         const struct shmob_drm_format_info *format;
 100
 101         format = shmob_drm_format_info(mode_cmd->pixel_format);
 102         if (format == NULL) {
 103                 dev_dbg(dev->dev, "unsupported pixel format %08x\n",
 104                         mode_cmd->pixel_format);
 105                 return ERR_PTR(-EINVAL);
 106         }
 107
 108         if (mode_cmd->pitches[0] & 7 || mode_cmd->pitches[0] >= 65536) {
 109                 dev_dbg(dev->dev, "invalid pitch value %u\n",
 110                         mode_cmd->pitches[0]);
 111                 return ERR_PTR(-EINVAL);
 112         }
 113
 114         if (format->yuv) {
 115                 unsigned int chroma_cpp = format->bpp == 24 ? 2 : 1;
 116
 117                 if (mode_cmd->pitches[1] != mode_cmd->pitches[0] * chroma_cpp) {
 118                         dev_dbg(dev->dev,
 119                                 "luma and chroma pitches do not match\n");
 120                         return ERR_PTR(-EINVAL);
 121                 }
 122         }
 123
 124         return drm_gem_fb_create(dev, file_priv, mode_cmd);
 125 }
 126
 127 static const struct drm_mode_config_funcs shmob_drm_mode_config_funcs = {
 128         .fb_create = shmob_drm_fb_create,
 129 };
 130
 131 int shmob_drm_modeset_init(struct shmob_drm_device *sdev)
 132 {
 133         drm_mode_config_init(sdev->ddev);
 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 }