linux-stable.git/drivers/gpu, branch v6.12.52

drm/amdgpu: Enable MES lr_compute_wa by default

2025-10-12T10:57:17+00:00

commit 1fb710793ce2619223adffaf981b1ff13cd48f17 upstream.

The MES set resources packet has an optional bit 'lr_compute_wa'
which can be used for preventing MES hangs on long compute jobs.

Set this bit by default.

Co-developed-by: Yifan Zhang 
Signed-off-by: Yifan Zhang 
Acked-by: Alex Deucher 
Signed-off-by: Mario Limonciello 
Signed-off-by: Alex Deucher 
Signed-off-by: Greg Kroah-Hartman

drm/amd/include : Update MES v12 API for fence update

2025-10-12T10:57:17+00:00

commit 15d8c92f107c17c2e585cb4888c67873538f9722 upstream.

MES fence_value will be updated in fence_addr if API success,
otherwise upper 32 bit will be used to indicate error code.
In any case, MES will trigger an EOP interrupt with 0xb1 as
context id in the interrupt cookie

Signed-off-by: Shaoyun Liu 
Acked-by: Alex Deucher 
Signed-off-by: Alex Deucher 
Signed-off-by: Greg Kroah-Hartman

drm/amd/include : MES v11 and v12 API header update

2025-10-12T10:57:17+00:00

commit 1c687c0da9efb7c627793483a8927554764e7a55 upstream.

MES requires driver set cleaner_shader_fence_mc_addr
for cleaner shader support.

Signed-off-by: Shaoyun Liu 
Acked-by: Alex Deucher 
Acked-by: Srinivasan Shanmugam 
Signed-off-by: Alex Deucher 
Signed-off-by: Greg Kroah-Hartman

drm/amd : Update MES API header file for v11 & v12

2025-10-12T10:57:17+00:00

commit ce4971388c79d36b3f50f607c3278dbfae6c789b upstream.

New features require the new fields defines

Signed-off-by: Shaoyun Liu 
Reviewed-by: Alex Deucher 
Signed-off-by: Alex Deucher 
Signed-off-by: Greg Kroah-Hartman

drm/i915/backlight: Return immediately when scale() finds invalid parameters

2025-10-02T11:44:15+00:00

commit 6f71507415841d1a6d38118e5fa0eaf0caab9c17 upstream.

The scale() functions detects invalid parameters, but continues
its calculations anyway. This causes bad results if negative values
are used for unsigned operations. Worst case, a division by 0 error
will be seen if source_min == source_max.

On top of that, after v6.13, the sequence of WARN_ON() followed by clamp()
may result in a build error with gcc 13.x.

drivers/gpu/drm/i915/display/intel_backlight.c: In function 'scale':
include/linux/compiler_types.h:542:45: error:
	call to '__compiletime_assert_415' declared with attribute error:
	clamp() low limit source_min greater than high limit source_max

This happens if the compiler decides to rearrange the code as follows.

        if (source_min > source_max) {
                WARN(..);
                /* Do the clamp() knowing that source_min > source_max */
                source_val = clamp(source_val, source_min, source_max);
        } else {
                /* Do the clamp knowing that source_min <= source_max */
                source_val = clamp(source_val, source_min, source_max);
        }

Fix the problem by evaluating the return values from WARN_ON and returning
immediately after a warning. While at it, fix divide by zero error seen
if source_min == source_max.

Analyzed-by: Linus Torvalds 
Suggested-by: Linus Torvalds 
Suggested-by: David Laight 
Cc: David Laight 
Cc: Jani Nikula 
Cc: Andy Shevchenko 
Signed-off-by: Guenter Roeck 
Reviewed-by: Rodrigo Vivi 
Link: https://patchwork.freedesktop.org/patch/msgid/20250121145203.2851237-1-linux@roeck-us.net
Signed-off-by: Rodrigo Vivi 
Signed-off-by: Greg Kroah-Hartman

drm/ast: Use msleep instead of mdelay for edid read

2025-10-02T11:44:14+00:00

commit c7c31f8dc54aa3c9b2c994b5f1ff7e740a654e97 upstream.

The busy-waiting in `mdelay()` can cause CPU stalls and kernel timeouts
during boot.

Signed-off-by: Nirmoy Das 
Reviewed-by: Thomas Zimmermann 
Tested-by: Carol L Soto csoto@nvidia.com
Fixes: 594e9c04b586 ("drm/ast: Create the driver for ASPEED proprietory Display-Port")
Cc: KuoHsiang Chou 
Cc: Thomas Zimmermann 
Cc: Dave Airlie 
Cc: Jocelyn Falempe 
Cc: dri-devel@lists.freedesktop.org
Cc:  # v5.19+
Signed-off-by: Thomas Zimmermann 
Link: https://lore.kernel.org/r/20250917194346.2905522-1-nirmoyd@nvidia.com
Signed-off-by: Greg Kroah-Hartman

drm/panthor: Defer scheduler entitiy destruction to queue release

2025-10-02T11:44:12+00:00

[ Upstream commit 7d9c3442b02ab7dd3c44e20095a178fd57d2eccb ]

Commit de8548813824 ("drm/panthor: Add the scheduler logical block")
handled destruction of a group's queues' drm scheduler entities early
into the group destruction procedure.

However, that races with the group submit ioctl, because by the time
entities are destroyed (through the group destroy ioctl), the submission
procedure might've already obtained a group handle, and therefore the
ability to push jobs into entities. This is met with a DRM error message
within the drm scheduler core as a situation that should never occur.

Fix by deferring drm scheduler entity destruction to queue release time.

Fixes: de8548813824 ("drm/panthor: Add the scheduler logical block")
Signed-off-by: Adrián Larumbe 
Reviewed-by: Steven Price 
Reviewed-by: Boris Brezillon 
Signed-off-by: Steven Price 
Link: https://lore.kernel.org/r/20250919164436.531930-1-adrian.larumbe@collabora.com
Signed-off-by: Sasha Levin

drm/gma500: Fix null dereference in hdmi teardown

2025-10-02T11:44:11+00:00

[ Upstream commit 352e66900cde63f3dadb142364d3c35170bbaaff ]

pci_set_drvdata sets the value of pdev->driver_data to NULL,
after which the driver_data obtained from the same dev is
dereferenced in oaktrail_hdmi_i2c_exit, and the i2c_dev is
extracted from it. To prevent this, swap these calls.

Found by Linux Verification Center (linuxtesting.org) with Svacer.

Fixes: 1b082ccf5901 ("gma500: Add Oaktrail support")
Signed-off-by: Zabelin Nikita 
Signed-off-by: Patrik Jakobsson 
Link: https://lore.kernel.org/r/20250918150703.2562604-1-n.zabelin@mt-integration.ru
Signed-off-by: Sasha Levin

drm/xe: Fix a NULL vs IS_ERR() in xe_vm_add_compute_exec_queue()

2025-09-25T09:13:48+00:00

[ Upstream commit cbc7f3b4f6ca19320e2eacf8fc1403d6f331ce14 ]

The xe_preempt_fence_create() function returns error pointers.  It
never returns NULL.  Update the error checking to match.

Fixes: dd08ebf6c352 ("drm/xe: Introduce a new DRM driver for Intel GPUs")
Signed-off-by: Dan Carpenter 
Reviewed-by: Matthew Brost 
Link: https://lore.kernel.org/r/aJTMBdX97cof_009@stanley.mountain
Signed-off-by: Rodrigo Vivi 
(cherry picked from commit 75cc23ffe5b422bc3cbd5cf0956b8b86e4b0e162)
Signed-off-by: Rodrigo Vivi 
Signed-off-by: Sasha Levin

drm: bridge: cdns-mhdp8546: Fix missing mutex unlock on error path

2025-09-25T09:13:48+00:00

[ Upstream commit 288dac9fb6084330d968459c750c838fd06e10e6 ]

Add missing mutex unlock before returning from the error path in
cdns_mhdp_atomic_enable().

Fixes: 935a92a1c400 ("drm: bridge: cdns-mhdp8546: Fix possible null pointer dereference")
Reported-by: Hulk Robot 
Signed-off-by: Qi Xi 
Reviewed-by: Luca Ceresoli 
Reviewed-by: Dmitry Baryshkov 
Link: https://lore.kernel.org/r/20250904034447.665427-1-xiqi2@huawei.com
Signed-off-by: Luca Ceresoli 
Signed-off-by: Sasha Levin