omap_fbdev.c 7.0 KB

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
  4. * Author: Rob Clark <rob@ti.com>
  5. */
  6. #include <drm/drm_crtc.h>
  7. #include <drm/drm_util.h>
  8. #include <drm/drm_fb_helper.h>
  9. #include <drm/drm_file.h>
  10. #include <drm/drm_fourcc.h>
  11. #include "omap_drv.h"
  12. MODULE_PARM_DESC(ywrap, "Enable ywrap scrolling (omap44xx and later, default 'y')");
  13. static bool ywrap_enabled = true;
  14. module_param_named(ywrap, ywrap_enabled, bool, 0644);
  15. /*
  16. * fbdev funcs, to implement legacy fbdev interface on top of drm driver
  17. */
  18. #define to_omap_fbdev(x) container_of(x, struct omap_fbdev, base)
  19. struct omap_fbdev {
  20. struct drm_fb_helper base;
  21. struct drm_framebuffer *fb;
  22. struct drm_gem_object *bo;
  23. bool ywrap_enabled;
  24. /* for deferred dmm roll when getting called in atomic ctx */
  25. struct work_struct work;
  26. };
  27. static struct drm_fb_helper *get_fb(struct fb_info *fbi);
  28. static void pan_worker(struct work_struct *work)
  29. {
  30. struct omap_fbdev *fbdev = container_of(work, struct omap_fbdev, work);
  31. struct fb_info *fbi = fbdev->base.fbdev;
  32. int npages;
  33. /* DMM roll shifts in 4K pages: */
  34. npages = fbi->fix.line_length >> PAGE_SHIFT;
  35. omap_gem_roll(fbdev->bo, fbi->var.yoffset * npages);
  36. }
  37. static int omap_fbdev_pan_display(struct fb_var_screeninfo *var,
  38. struct fb_info *fbi)
  39. {
  40. struct drm_fb_helper *helper = get_fb(fbi);
  41. struct omap_fbdev *fbdev = to_omap_fbdev(helper);
  42. if (!helper)
  43. goto fallback;
  44. if (!fbdev->ywrap_enabled)
  45. goto fallback;
  46. if (drm_can_sleep()) {
  47. pan_worker(&fbdev->work);
  48. } else {
  49. struct omap_drm_private *priv = helper->dev->dev_private;
  50. queue_work(priv->wq, &fbdev->work);
  51. }
  52. return 0;
  53. fallback:
  54. return drm_fb_helper_pan_display(var, fbi);
  55. }
  56. static const struct fb_ops omap_fb_ops = {
  57. .owner = THIS_MODULE,
  58. .fb_check_var = drm_fb_helper_check_var,
  59. .fb_set_par = drm_fb_helper_set_par,
  60. .fb_setcmap = drm_fb_helper_setcmap,
  61. .fb_blank = drm_fb_helper_blank,
  62. .fb_pan_display = omap_fbdev_pan_display,
  63. .fb_ioctl = drm_fb_helper_ioctl,
  64. .fb_read = drm_fb_helper_sys_read,
  65. .fb_write = drm_fb_helper_sys_write,
  66. .fb_fillrect = drm_fb_helper_sys_fillrect,
  67. .fb_copyarea = drm_fb_helper_sys_copyarea,
  68. .fb_imageblit = drm_fb_helper_sys_imageblit,
  69. };
  70. static int omap_fbdev_create(struct drm_fb_helper *helper,
  71. struct drm_fb_helper_surface_size *sizes)
  72. {
  73. struct omap_fbdev *fbdev = to_omap_fbdev(helper);
  74. struct drm_device *dev = helper->dev;
  75. struct omap_drm_private *priv = dev->dev_private;
  76. struct drm_framebuffer *fb = NULL;
  77. union omap_gem_size gsize;
  78. struct fb_info *fbi = NULL;
  79. struct drm_mode_fb_cmd2 mode_cmd = {0};
  80. dma_addr_t dma_addr;
  81. int ret;
  82. sizes->surface_bpp = 32;
  83. sizes->surface_depth = 24;
  84. DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
  85. sizes->surface_height, sizes->surface_bpp,
  86. sizes->fb_width, sizes->fb_height);
  87. mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
  88. sizes->surface_depth);
  89. mode_cmd.width = sizes->surface_width;
  90. mode_cmd.height = sizes->surface_height;
  91. mode_cmd.pitches[0] =
  92. DIV_ROUND_UP(mode_cmd.width * sizes->surface_bpp, 8);
  93. fbdev->ywrap_enabled = priv->has_dmm && ywrap_enabled;
  94. if (fbdev->ywrap_enabled) {
  95. /* need to align pitch to page size if using DMM scrolling */
  96. mode_cmd.pitches[0] = PAGE_ALIGN(mode_cmd.pitches[0]);
  97. }
  98. /* allocate backing bo */
  99. gsize = (union omap_gem_size){
  100. .bytes = PAGE_ALIGN(mode_cmd.pitches[0] * mode_cmd.height),
  101. };
  102. DBG("allocating %d bytes for fb %d", gsize.bytes, dev->primary->index);
  103. fbdev->bo = omap_gem_new(dev, gsize, OMAP_BO_SCANOUT | OMAP_BO_WC);
  104. if (!fbdev->bo) {
  105. dev_err(dev->dev, "failed to allocate buffer object\n");
  106. ret = -ENOMEM;
  107. goto fail;
  108. }
  109. fb = omap_framebuffer_init(dev, &mode_cmd, &fbdev->bo);
  110. if (IS_ERR(fb)) {
  111. dev_err(dev->dev, "failed to allocate fb\n");
  112. /* note: if fb creation failed, we can't rely on fb destroy
  113. * to unref the bo:
  114. */
  115. drm_gem_object_put(fbdev->bo);
  116. ret = PTR_ERR(fb);
  117. goto fail;
  118. }
  119. /* note: this keeps the bo pinned.. which is perhaps not ideal,
  120. * but is needed as long as we use fb_mmap() to mmap to userspace
  121. * (since this happens using fix.smem_start). Possibly we could
  122. * implement our own mmap using GEM mmap support to avoid this
  123. * (non-tiled buffer doesn't need to be pinned for fbcon to write
  124. * to it). Then we just need to be sure that we are able to re-
  125. * pin it in case of an opps.
  126. */
  127. ret = omap_gem_pin(fbdev->bo, &dma_addr);
  128. if (ret) {
  129. dev_err(dev->dev, "could not pin framebuffer\n");
  130. ret = -ENOMEM;
  131. goto fail;
  132. }
  133. fbi = drm_fb_helper_alloc_fbi(helper);
  134. if (IS_ERR(fbi)) {
  135. dev_err(dev->dev, "failed to allocate fb info\n");
  136. ret = PTR_ERR(fbi);
  137. goto fail;
  138. }
  139. DBG("fbi=%p, dev=%p", fbi, dev);
  140. fbdev->fb = fb;
  141. helper->fb = fb;
  142. fbi->fbops = &omap_fb_ops;
  143. drm_fb_helper_fill_info(fbi, helper, sizes);
  144. dev->mode_config.fb_base = dma_addr;
  145. fbi->screen_buffer = omap_gem_vaddr(fbdev->bo);
  146. fbi->screen_size = fbdev->bo->size;
  147. fbi->fix.smem_start = dma_addr;
  148. fbi->fix.smem_len = fbdev->bo->size;
  149. /* if we have DMM, then we can use it for scrolling by just
  150. * shuffling pages around in DMM rather than doing sw blit.
  151. */
  152. if (fbdev->ywrap_enabled) {
  153. DRM_INFO("Enabling DMM ywrap scrolling\n");
  154. fbi->flags |= FBINFO_HWACCEL_YWRAP | FBINFO_READS_FAST;
  155. fbi->fix.ywrapstep = 1;
  156. }
  157. DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
  158. DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);
  159. return 0;
  160. fail:
  161. if (ret) {
  162. if (fb)
  163. drm_framebuffer_remove(fb);
  164. }
  165. return ret;
  166. }
  167. static const struct drm_fb_helper_funcs omap_fb_helper_funcs = {
  168. .fb_probe = omap_fbdev_create,
  169. };
  170. static struct drm_fb_helper *get_fb(struct fb_info *fbi)
  171. {
  172. if (!fbi || strcmp(fbi->fix.id, MODULE_NAME)) {
  173. /* these are not the fb's you're looking for */
  174. return NULL;
  175. }
  176. return fbi->par;
  177. }
  178. /* initialize fbdev helper */
  179. void omap_fbdev_init(struct drm_device *dev)
  180. {
  181. struct omap_drm_private *priv = dev->dev_private;
  182. struct omap_fbdev *fbdev = NULL;
  183. struct drm_fb_helper *helper;
  184. int ret = 0;
  185. if (!priv->num_pipes)
  186. return;
  187. fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
  188. if (!fbdev)
  189. goto fail;
  190. INIT_WORK(&fbdev->work, pan_worker);
  191. helper = &fbdev->base;
  192. drm_fb_helper_prepare(dev, helper, &omap_fb_helper_funcs);
  193. ret = drm_fb_helper_init(dev, helper);
  194. if (ret)
  195. goto fail;
  196. ret = drm_fb_helper_initial_config(helper, 32);
  197. if (ret)
  198. goto fini;
  199. priv->fbdev = helper;
  200. return;
  201. fini:
  202. drm_fb_helper_fini(helper);
  203. fail:
  204. kfree(fbdev);
  205. dev_warn(dev->dev, "omap_fbdev_init failed\n");
  206. }
  207. void omap_fbdev_fini(struct drm_device *dev)
  208. {
  209. struct omap_drm_private *priv = dev->dev_private;
  210. struct drm_fb_helper *helper = priv->fbdev;
  211. struct omap_fbdev *fbdev;
  212. DBG();
  213. if (!helper)
  214. return;
  215. drm_fb_helper_unregister_fbi(helper);
  216. drm_fb_helper_fini(helper);
  217. fbdev = to_omap_fbdev(helper);
  218. /* unpin the GEM object pinned in omap_fbdev_create() */
  219. if (fbdev->bo)
  220. omap_gem_unpin(fbdev->bo);
  221. /* this will free the backing object */
  222. if (fbdev->fb)
  223. drm_framebuffer_remove(fbdev->fb);
  224. kfree(fbdev);
  225. priv->fbdev = NULL;
  226. }