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linux (Generic): add temporary patch to fix i915 frame buffer corruption

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MilhouseVH 2019-11-15 01:30:43 +00:00
parent cced4248b9
commit 9011e4a547
1 changed files with 57 additions and 0 deletions
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packages/linux/patches/default/linux-999-drm-i915-fbdev-restore-pysical-addesses-for-fb_mmap.patch Normal file
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@ -0,0 +1,57 @@
From patchwork Wed Nov 13 18:06:33 2019
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Subject: drm/i915/fbdev: Restore physical addresses for fb_mmap()
From: Chris Wilson <chris@chris-wilson.co.uk>
X-Patchwork-Id: 340663
Message-Id: <20191113180633.3947-1-chris@chris-wilson.co.uk>
To: intel-gfx@lists.freedesktop.org
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Wed, 13 Nov 2019 18:06:33 +0000
fbdev uses the physical address of our framebuffer for its fb_mmap()
routine. While we need to adapt this address for the new io BAR, we have
to fix v5.4 first! The simplest fix is to restore the smem back to v5.4
and we will then probably have to implement our fbops->fb_mmap() call
back to handle local memory.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=112256
Fixes: 5f889b9a61dd ("drm/i915: Disregard drm_mode_config.fb_base")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reported-by: Neil MacLeod <freedesktop@nmacleod.com>
Tested-by: Neil MacLeod <freedesktop@nmacleod.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
drivers/gpu/drm/i915/display/intel_fbdev.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.c b/drivers/gpu/drm/i915/display/intel_fbdev.c
index 3d1061470e76..48c960ca12fb 100644
--- a/drivers/gpu/drm/i915/display/intel_fbdev.c
+++ b/drivers/gpu/drm/i915/display/intel_fbdev.c
@@ -234,6 +234,11 @@ static int intelfb_create(struct drm_fb_helper *helper,
info->apertures->ranges[0].base = ggtt->gmadr.start;
info->apertures->ranges[0].size = ggtt->mappable_end;
+ /* Our framebuffer is the entirety of fbdev's system memory */
+ info->fix.smem_start =
+ (unsigned long)(ggtt->gmadr.start + vma->node.start);
+ info->fix.smem_len = vma->node.size;
+
vaddr = i915_vma_pin_iomap(vma);
if (IS_ERR(vaddr)) {
DRM_ERROR("Failed to remap framebuffer into virtual memory\n");
@@ -243,10 +248,6 @@ static int intelfb_create(struct drm_fb_helper *helper,
info->screen_base = vaddr;
info->screen_size = vma->node.size;
- /* Our framebuffer is the entirety of fbdev's system memory */
- info->fix.smem_start = (unsigned long)info->screen_base;
- info->fix.smem_len = info->screen_size;
-
drm_fb_helper_fill_info(info, &ifbdev->helper, sizes);
/* If the object is shmemfs backed, it will have given us zeroed pages.