This is a note to let you know that I've just added the patch titled
Revert "drm/amd: Disable S/G for APUs when 64GB or more host memory"
to the 6.5-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
revert-drm-amd-disable-s-g-for-apus-when-64gb-or-more-host-memory.patch
and it can be found in the queue-6.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 169ed4ece8373f02f10642eae5240e3d1ef5c038 Mon Sep 17 00:00:00 2001
From: Hamza Mahfooz <hamza.mahfooz@xxxxxxx>
Date: Fri, 8 Sep 2023 10:36:44 -0400
Subject: Revert "drm/amd: Disable S/G for APUs when 64GB or more host memory"
From: Hamza Mahfooz <hamza.mahfooz@xxxxxxx>
commit 169ed4ece8373f02f10642eae5240e3d1ef5c038 upstream.
This reverts commit 70e64c4d522b732e31c6475a3be2349de337d321.
Since, we now have an actual fix for this issue, we can get rid of this
workaround as it can cause pin failures if enough VRAM isn't carved out
by the BIOS.
Cc: stable@xxxxxxxxxxxxxxx # 6.1+
Acked-by: Harry Wentland <harry.wentland@xxxxxxx>
Reviewed-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Hamza Mahfooz <hamza.mahfooz@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu.h | 1
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 26 ----------------------
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 5 ++--
3 files changed, 3 insertions(+), 29 deletions(-)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -1296,7 +1296,6 @@ int amdgpu_device_gpu_recover(struct amd
void amdgpu_device_pci_config_reset(struct amdgpu_device *adev);
int amdgpu_device_pci_reset(struct amdgpu_device *adev);
bool amdgpu_device_need_post(struct amdgpu_device *adev);
-bool amdgpu_sg_display_supported(struct amdgpu_device *adev);
bool amdgpu_device_pcie_dynamic_switching_supported(void);
bool amdgpu_device_should_use_aspm(struct amdgpu_device *adev);
bool amdgpu_device_aspm_support_quirk(void);
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -1462,32 +1462,6 @@ bool amdgpu_device_need_post(struct amdg
}
/*
- * On APUs with >= 64GB white flickering has been observed w/ SG enabled.
- * Disable S/G on such systems until we have a proper fix.
- * https://gitlab.freedesktop.org/drm/amd/-/issues/2354
- * https://gitlab.freedesktop.org/drm/amd/-/issues/2735
- */
-bool amdgpu_sg_display_supported(struct amdgpu_device *adev)
-{
- switch (amdgpu_sg_display) {
- case -1:
- break;
- case 0:
- return false;
- case 1:
- return true;
- default:
- return false;
- }
- if ((totalram_pages() << (PAGE_SHIFT - 10)) +
- (adev->gmc.real_vram_size / 1024) >= 64000000) {
- DRM_WARN("Disabling S/G due to >=64GB RAM\n");
- return false;
- }
- return true;
-}
-
-/*
* Intel hosts such as Raptor Lake and Sapphire Rapids don't support dynamic
* speed switching. Until we have confirmation from Intel that a specific host
* supports it, it's safer that we keep it disabled for all.
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -1638,8 +1638,9 @@ static int amdgpu_dm_init(struct amdgpu_
}
break;
}
- if (init_data.flags.gpu_vm_support)
- init_data.flags.gpu_vm_support = amdgpu_sg_display_supported(adev);
+ if (init_data.flags.gpu_vm_support &&
+ (amdgpu_sg_display == 0))
+ init_data.flags.gpu_vm_support = false;
if (init_data.flags.gpu_vm_support)
adev->mode_info.gpu_vm_support = true;
Patches currently in stable-queue which might be from hamza.mahfooz@xxxxxxx are
queue-6.5/drm-amd-display-add-dpia-link-encoder-assignment-fix.patch
queue-6.5/revert-drm-amd-disable-s-g-for-apus-when-64gb-or-more-host-memory.patch
queue-6.5/drm-amd-display-fix-the-white-screen-issue-when-64gb-dram.patch
