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![Jesse Barnes](/assets/img/avatar_default.png)
The BIOS or boot loader will generally create an initial display configuration for us that includes some set of active pipes and displays. This routine tries to figure out which pipes and connectors are active and stuffs them into the crtcs and modes array given to us by the drm_fb_helper code. The overall sequence is: intel_fbdev_init - from driver load intel_fbdev_init_bios - initialize the intel_fbdev using BIOS data drm_fb_helper_init - build fb helper structs drm_fb_helper_single_add_all_connectors - more fb helper structs intel_fbdev_initial_config - apply the config drm_fb_helper_initial_config - call ->probe then register_framebuffer() drm_setup_crtcs - build crtc config for fbdev intel_fb_initial_config - find active connectors etc drm_fb_helper_single_fb_probe - set up fbdev intelfb_create - re-use or alloc fb, build out fbdev structs v2: use BIOS connector config unconditionally if possible (Daniel) check for crtc cloning and reject (Daniel) fix up comments (Daniel) v3: use command line args and preferred modes first (Ville) Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org> Tested-by: Ville Syrjälä <ville.syrjala@linux.intel.com> [danvet: Re-add the WARN_ON for a missing encoder crtc - the state sanitizer should take care of this. And spell-ocd the comments.] Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
481 lines
14 KiB
C
481 lines
14 KiB
C
/*
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* Copyright © 2007 David Airlie
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* Authors:
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* David Airlie
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/tty.h>
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#include <linux/sysrq.h>
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#include <linux/delay.h>
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#include <linux/fb.h>
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#include <linux/init.h>
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#include <linux/vga_switcheroo.h>
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#include <drm/drmP.h>
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#include <drm/drm_crtc.h>
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#include <drm/drm_fb_helper.h>
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#include "intel_drv.h"
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#include <drm/i915_drm.h>
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#include "i915_drv.h"
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static struct fb_ops intelfb_ops = {
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.owner = THIS_MODULE,
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.fb_check_var = drm_fb_helper_check_var,
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.fb_set_par = drm_fb_helper_set_par,
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.fb_fillrect = cfb_fillrect,
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.fb_copyarea = cfb_copyarea,
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.fb_imageblit = cfb_imageblit,
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.fb_pan_display = drm_fb_helper_pan_display,
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.fb_blank = drm_fb_helper_blank,
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.fb_setcmap = drm_fb_helper_setcmap,
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.fb_debug_enter = drm_fb_helper_debug_enter,
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.fb_debug_leave = drm_fb_helper_debug_leave,
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};
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static int intelfb_alloc(struct drm_fb_helper *helper,
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struct drm_fb_helper_surface_size *sizes)
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{
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struct intel_fbdev *ifbdev =
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container_of(helper, struct intel_fbdev, helper);
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struct drm_framebuffer *fb;
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struct drm_device *dev = helper->dev;
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struct drm_mode_fb_cmd2 mode_cmd = {};
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struct drm_i915_gem_object *obj;
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int size, ret;
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/* we don't do packed 24bpp */
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if (sizes->surface_bpp == 24)
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sizes->surface_bpp = 32;
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mode_cmd.width = sizes->surface_width;
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mode_cmd.height = sizes->surface_height;
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mode_cmd.pitches[0] = ALIGN(mode_cmd.width *
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DIV_ROUND_UP(sizes->surface_bpp, 8), 64);
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mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
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sizes->surface_depth);
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size = mode_cmd.pitches[0] * mode_cmd.height;
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size = ALIGN(size, PAGE_SIZE);
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obj = i915_gem_object_create_stolen(dev, size);
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if (obj == NULL)
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obj = i915_gem_alloc_object(dev, size);
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if (!obj) {
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DRM_ERROR("failed to allocate framebuffer\n");
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ret = -ENOMEM;
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goto out;
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}
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/* Flush everything out, we'll be doing GTT only from now on */
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ret = intel_pin_and_fence_fb_obj(dev, obj, NULL);
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if (ret) {
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DRM_ERROR("failed to pin obj: %d\n", ret);
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goto out_unref;
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}
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fb = __intel_framebuffer_create(dev, &mode_cmd, obj);
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if (IS_ERR(fb)) {
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ret = PTR_ERR(fb);
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goto out_unpin;
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}
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ifbdev->fb = to_intel_framebuffer(fb);
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return 0;
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out_unpin:
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i915_gem_object_ggtt_unpin(obj);
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out_unref:
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drm_gem_object_unreference(&obj->base);
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out:
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return ret;
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}
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static int intelfb_create(struct drm_fb_helper *helper,
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struct drm_fb_helper_surface_size *sizes)
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{
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struct intel_fbdev *ifbdev =
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container_of(helper, struct intel_fbdev, helper);
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struct intel_framebuffer *intel_fb = ifbdev->fb;
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struct drm_device *dev = helper->dev;
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struct drm_i915_private *dev_priv = dev->dev_private;
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struct fb_info *info;
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struct drm_framebuffer *fb;
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struct drm_i915_gem_object *obj;
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int size, ret;
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mutex_lock(&dev->struct_mutex);
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if (!intel_fb || WARN_ON(!intel_fb->obj)) {
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DRM_DEBUG_KMS("no BIOS fb, allocating a new one\n");
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ret = intelfb_alloc(helper, sizes);
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if (ret)
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goto out_unlock;
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intel_fb = ifbdev->fb;
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} else {
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DRM_DEBUG_KMS("re-using BIOS fb\n");
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sizes->fb_width = intel_fb->base.width;
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sizes->fb_height = intel_fb->base.height;
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}
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obj = intel_fb->obj;
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size = obj->base.size;
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info = framebuffer_alloc(0, &dev->pdev->dev);
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if (!info) {
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ret = -ENOMEM;
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goto out_unpin;
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}
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info->par = helper;
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fb = &ifbdev->fb->base;
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ifbdev->helper.fb = fb;
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ifbdev->helper.fbdev = info;
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strcpy(info->fix.id, "inteldrmfb");
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info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
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info->fbops = &intelfb_ops;
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ret = fb_alloc_cmap(&info->cmap, 256, 0);
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if (ret) {
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ret = -ENOMEM;
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goto out_unpin;
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}
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/* setup aperture base/size for vesafb takeover */
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info->apertures = alloc_apertures(1);
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if (!info->apertures) {
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ret = -ENOMEM;
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goto out_unpin;
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}
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info->apertures->ranges[0].base = dev->mode_config.fb_base;
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info->apertures->ranges[0].size = dev_priv->gtt.mappable_end;
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info->fix.smem_start = dev->mode_config.fb_base + i915_gem_obj_ggtt_offset(obj);
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info->fix.smem_len = size;
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info->screen_base =
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ioremap_wc(dev_priv->gtt.mappable_base + i915_gem_obj_ggtt_offset(obj),
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size);
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if (!info->screen_base) {
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ret = -ENOSPC;
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goto out_unpin;
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}
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info->screen_size = size;
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/* This driver doesn't need a VT switch to restore the mode on resume */
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info->skip_vt_switch = true;
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drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
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drm_fb_helper_fill_var(info, &ifbdev->helper, sizes->fb_width, sizes->fb_height);
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/* If the object is shmemfs backed, it will have given us zeroed pages.
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* If the object is stolen however, it will be full of whatever
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* garbage was left in there.
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*/
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if (ifbdev->fb->obj->stolen)
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memset_io(info->screen_base, 0, info->screen_size);
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/* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
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DRM_DEBUG_KMS("allocated %dx%d fb: 0x%08lx, bo %p\n",
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fb->width, fb->height,
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i915_gem_obj_ggtt_offset(obj), obj);
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mutex_unlock(&dev->struct_mutex);
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vga_switcheroo_client_fb_set(dev->pdev, info);
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return 0;
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out_unpin:
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i915_gem_object_ggtt_unpin(obj);
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drm_gem_object_unreference(&obj->base);
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out_unlock:
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mutex_unlock(&dev->struct_mutex);
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return ret;
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}
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/** Sets the color ramps on behalf of RandR */
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static void intel_crtc_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
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u16 blue, int regno)
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{
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struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
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intel_crtc->lut_r[regno] = red >> 8;
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intel_crtc->lut_g[regno] = green >> 8;
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intel_crtc->lut_b[regno] = blue >> 8;
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}
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static void intel_crtc_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
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u16 *blue, int regno)
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{
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struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
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*red = intel_crtc->lut_r[regno] << 8;
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*green = intel_crtc->lut_g[regno] << 8;
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*blue = intel_crtc->lut_b[regno] << 8;
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}
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static struct drm_fb_helper_crtc *
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intel_fb_helper_crtc(struct drm_fb_helper *fb_helper, struct drm_crtc *crtc)
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{
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int i;
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for (i = 0; i < fb_helper->crtc_count; i++)
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if (fb_helper->crtc_info[i].mode_set.crtc == crtc)
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return &fb_helper->crtc_info[i];
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return NULL;
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}
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/*
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* Try to read the BIOS display configuration and use it for the initial
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* fb configuration.
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*
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* The BIOS or boot loader will generally create an initial display
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* configuration for us that includes some set of active pipes and displays.
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* This routine tries to figure out which pipes and connectors are active
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* and stuffs them into the crtcs and modes array given to us by the
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* drm_fb_helper code.
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*
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* The overall sequence is:
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* intel_fbdev_init - from driver load
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* intel_fbdev_init_bios - initialize the intel_fbdev using BIOS data
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* drm_fb_helper_init - build fb helper structs
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* drm_fb_helper_single_add_all_connectors - more fb helper structs
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* intel_fbdev_initial_config - apply the config
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* drm_fb_helper_initial_config - call ->probe then register_framebuffer()
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* drm_setup_crtcs - build crtc config for fbdev
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* intel_fb_initial_config - find active connectors etc
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* drm_fb_helper_single_fb_probe - set up fbdev
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* intelfb_create - re-use or alloc fb, build out fbdev structs
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*
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* Note that we don't make special consideration whether we could actually
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* switch to the selected modes without a full modeset. E.g. when the display
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* is in VGA mode we need to recalculate watermarks and set a new high-res
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* framebuffer anyway.
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*/
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static bool intel_fb_initial_config(struct drm_fb_helper *fb_helper,
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struct drm_fb_helper_crtc **crtcs,
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struct drm_display_mode **modes,
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bool *enabled, int width, int height)
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{
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int i, j;
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for (i = 0; i < fb_helper->connector_count; i++) {
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struct drm_fb_helper_connector *fb_conn;
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struct drm_connector *connector;
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struct drm_encoder *encoder;
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struct drm_fb_helper_crtc *new_crtc;
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fb_conn = fb_helper->connector_info[i];
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connector = fb_conn->connector;
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if (!enabled[i]) {
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DRM_DEBUG_KMS("connector %d not enabled, skipping\n",
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connector->base.id);
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continue;
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}
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encoder = connector->encoder;
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if (!encoder || WARN_ON(!encoder->crtc)) {
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DRM_DEBUG_KMS("connector %d has no encoder or crtc, skipping\n",
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connector->base.id);
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enabled[i] = false;
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continue;
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}
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new_crtc = intel_fb_helper_crtc(fb_helper, encoder->crtc);
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/*
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* Make sure we're not trying to drive multiple connectors
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* with a single CRTC, since our cloning support may not
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* match the BIOS.
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*/
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for (j = 0; j < fb_helper->connector_count; j++) {
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if (crtcs[j] == new_crtc)
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return false;
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}
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DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
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fb_conn->connector->base.id);
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/* go for command line mode first */
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modes[i] = drm_pick_cmdline_mode(fb_conn, width, height);
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/* try for preferred next */
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if (!modes[i]) {
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DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
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fb_conn->connector->base.id);
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modes[i] = drm_has_preferred_mode(fb_conn, width,
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height);
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}
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/* last resort: use current mode */
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if (!modes[i]) {
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/*
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* IMPORTANT: We want to use the adjusted mode (i.e.
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* after the panel fitter upscaling) as the initial
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* config, not the input mode, which is what crtc->mode
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* usually contains. But since our current fastboot
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* code puts a mode derived from the post-pfit timings
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* into crtc->mode this works out correctly. We don't
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* use hwmode anywhere right now, so use it for this
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* since the fb helper layer wants a pointer to
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* something we own.
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*/
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intel_mode_from_pipe_config(&encoder->crtc->hwmode,
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&to_intel_crtc(encoder->crtc)->config);
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modes[i] = &encoder->crtc->hwmode;
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}
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crtcs[i] = new_crtc;
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DRM_DEBUG_KMS("connector %s on crtc %d: %s\n",
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drm_get_connector_name(connector),
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encoder->crtc->base.id,
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modes[i]->name);
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}
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return true;
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}
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static struct drm_fb_helper_funcs intel_fb_helper_funcs = {
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.initial_config = intel_fb_initial_config,
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.gamma_set = intel_crtc_fb_gamma_set,
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.gamma_get = intel_crtc_fb_gamma_get,
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.fb_probe = intelfb_create,
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};
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static void intel_fbdev_destroy(struct drm_device *dev,
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struct intel_fbdev *ifbdev)
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{
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if (ifbdev->helper.fbdev) {
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struct fb_info *info = ifbdev->helper.fbdev;
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unregister_framebuffer(info);
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iounmap(info->screen_base);
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if (info->cmap.len)
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fb_dealloc_cmap(&info->cmap);
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framebuffer_release(info);
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}
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drm_fb_helper_fini(&ifbdev->helper);
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drm_framebuffer_unregister_private(&ifbdev->fb->base);
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drm_framebuffer_remove(&ifbdev->fb->base);
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}
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int intel_fbdev_init(struct drm_device *dev)
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{
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struct intel_fbdev *ifbdev;
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struct drm_i915_private *dev_priv = dev->dev_private;
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int ret;
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ifbdev = kzalloc(sizeof(*ifbdev), GFP_KERNEL);
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if (!ifbdev)
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return -ENOMEM;
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dev_priv->fbdev = ifbdev;
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ifbdev->helper.funcs = &intel_fb_helper_funcs;
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ret = drm_fb_helper_init(dev, &ifbdev->helper,
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INTEL_INFO(dev)->num_pipes,
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4);
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if (ret) {
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kfree(ifbdev);
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return ret;
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}
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drm_fb_helper_single_add_all_connectors(&ifbdev->helper);
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return 0;
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}
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void intel_fbdev_initial_config(struct drm_device *dev)
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{
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struct drm_i915_private *dev_priv = dev->dev_private;
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/* Due to peculiar init order wrt to hpd handling this is separate. */
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drm_fb_helper_initial_config(&dev_priv->fbdev->helper, 32);
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}
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void intel_fbdev_fini(struct drm_device *dev)
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{
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struct drm_i915_private *dev_priv = dev->dev_private;
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if (!dev_priv->fbdev)
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return;
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intel_fbdev_destroy(dev, dev_priv->fbdev);
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kfree(dev_priv->fbdev);
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dev_priv->fbdev = NULL;
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}
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void intel_fbdev_set_suspend(struct drm_device *dev, int state)
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{
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struct drm_i915_private *dev_priv = dev->dev_private;
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struct intel_fbdev *ifbdev = dev_priv->fbdev;
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struct fb_info *info;
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if (!ifbdev)
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return;
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info = ifbdev->helper.fbdev;
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/* On resume from hibernation: If the object is shmemfs backed, it has
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* been restored from swap. If the object is stolen however, it will be
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* full of whatever garbage was left in there.
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*/
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if (state == FBINFO_STATE_RUNNING && ifbdev->fb->obj->stolen)
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memset_io(info->screen_base, 0, info->screen_size);
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fb_set_suspend(info, state);
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}
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void intel_fbdev_output_poll_changed(struct drm_device *dev)
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{
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struct drm_i915_private *dev_priv = dev->dev_private;
|
|
drm_fb_helper_hotplug_event(&dev_priv->fbdev->helper);
|
|
}
|
|
|
|
void intel_fbdev_restore_mode(struct drm_device *dev)
|
|
{
|
|
int ret;
|
|
struct drm_i915_private *dev_priv = dev->dev_private;
|
|
|
|
if (INTEL_INFO(dev)->num_pipes == 0)
|
|
return;
|
|
|
|
drm_modeset_lock_all(dev);
|
|
|
|
ret = drm_fb_helper_restore_fbdev_mode(&dev_priv->fbdev->helper);
|
|
if (ret)
|
|
DRM_DEBUG("failed to restore crtc mode\n");
|
|
|
|
drm_modeset_unlock_all(dev);
|
|
}
|