There could be boards with DCN listed in IP discovery, but no
display hardware actually wired up. In this case the vbios
display table will not be populated. Detect this case and
skip loading DM when we detect it.
v2: Mark DCN as harvested as well so other display checks
elsewhere in the driver are handled properly.
Cc: Aurabindo Pillai <aurabindo.pillai@amd.com>
Reviewed-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
These sysfs nodes are tested supported, so enable them.
Signed-off-by: Yiqing Yao <yiqing.yao@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
A mistake has been made on some boards with NBIO 4.3.0 where some
NBIO registers aren't properly set by the hardware.
Ensure that they're set during initialization.
Cc: Natikar Basavaraj <Basavaraj.Natikar@amd.com>
Tested-by: Satyanarayana ReddyTVN <Satyanarayana.ReddyTVN@amd.com>
Tested-by: Rutvij Gajjar <Rutvij.Gajjar@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org # 6.1.x
Enable HDP clock gating control for gfx 11.0.3.
Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Feifei Xu <Feifei.Xu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
PMFW will handle the features disablement properly for gpu reset case,
driver involvement may cause some unexpected issues.
Cc: stable@vger.kernel.org # 6.1
Signed-off-by: Tim Huang <tim.huang@amd.com>
Reviewed-by: Yifan Zhang <yifan1.zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
[Why]
Otherwise we can be out of sync with what's in the hardware, leading
to us rerunning every command that's presently in the ringbuffer.
[How]
Reset software state for the mailboxes in hw_reset callback.
This is already done as part of the mailbox init in hw_init, but we
do need to remember to reset the last cached wptr value as well here.
Reviewed-by: Hansen Dsouza <hansen.dsouza@amd.com>
Acked-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
[Why]
The hwss function does_plane_fit_in_mall not applicable to dcn3.2 asics.
Using it with dcn3.2 can result in undefined behaviour.
[How]
Assign the function pointer to NULL.
Reviewed-by: Alvin Lee <Alvin.Lee2@amd.com>
Acked-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: George Shen <george.shen@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
[Why]
Lower max_downscale_ratio and ARGB888 downscale factor
to prevent cases where underflow may occur on dcn314
[How]
Set max_downscale_ratio to 400 and ARGB downscale factor
to 250 for dcn314
Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com>
Acked-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Daniel Miess <Daniel.Miess@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
[Why]
Brackets missing in the calculation for MIN_DST_Y_NEXT_START
[How]
Add missing brackets for this calculation
Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com>
Acked-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Daniel Miess <Daniel.Miess@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
SQ_WAVE_INST_DW0 isn't present on gfx11 compared to gfx10, so update
wave data type to signify a difference.
Signed-off-by: Graham Sider <Graham.Sider@amd.com>
Reviewed-by: Mukul Joshi <Mukul.Joshi@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org # 6.1.x
[Why&How]
Switching between certain modes that are freesync video modes and those
are not freesync video modes result in timing not changing as seen by
the monitor due to incorrect timing being driven.
The issue is fixed by ensuring that when a non freesync video mode is
set, we reset the freesync status on the crtc.
Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com>
Acked-by: Alan Liu <HaoPing.Liu@amd.com>
Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
[Why & How]
Now the vc_start_slot is controlled at drm side. When we
service a long HPD, we still need to run
dm_helpers_dp_mst_write_payload_allocation_table() to update
drm mst_mgr's relevant variable. Otherwise, on the next plug-in,
payload will get assigned with a wrong start slot.
Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/2171
Signed-off-by: Wayne Lin <Wayne.Lin@amd.com>
Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Fixes: 4d07b0bc40 ("drm/display/dp_mst: Move all payload info into the atomic state")
Cc: stable@vger.kernel.org # 6.1
Acked-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Tested-by: Didier Raboud <odyx@debian.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
[Why]
amdgpu expects to update payload table for one stream one time
by calling dm_helpers_dp_mst_write_payload_allocation_table().
Currently, it get modified to try to update HW payload table
at once by referring mst_state.
[How]
This is just a quick workaround. Should find way to remove the
temporary struct dc_dp_mst_stream_allocation_table later if set
struct link_mst_stream_allocatio directly is possible.
Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/2171
Signed-off-by: Wayne Lin <Wayne.Lin@amd.com>
Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Fixes: 4d07b0bc40 ("drm/display/dp_mst: Move all payload info into the atomic state")
Cc: stable@vger.kernel.org # 6.1
Acked-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Tested-by: Didier Raboud <odyx@debian.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Looks like I made a pretty big mistake here without noticing: it seems when
I moved the assignments of mst_state->pbn_div I completely missed the fact
that the reason for us calling drm_dp_mst_update_slots() earlier was to
account for the fact that we need to call this function using info from the
root MST connector, instead of just trying to do this from each MST
encoder's atomic check function. Otherwise, we end up filling out all of
DC's link information with zeroes.
So, let's restore that and hopefully fix this DSC regression.
Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/2171
Signed-off-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Fixes: 4d07b0bc40 ("drm/display/dp_mst: Move all payload info into the atomic state")
Cc: stable@vger.kernel.org # 6.1
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Tested-by: Didier Raboud <odyx@debian.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
To support new mes ip block
Signed-off-by: Li Ma <li.ma@amd.com>
Reviewed-by: Yifan Zhang <yifan1.zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
The GC 11.0.4 needs load IMU to power up GFX before loads GFX firmware.
Signed-off-by: Li Ma <li.ma@amd.com>
Reviewed-by: Yifan Zhang <yifan1.zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Rebase of driver has incorrect unconditional trap enablement
for GFX11 when adding mes queues.
Reported-by: Graham Sider <graham.sider@amd.com>
Signed-off-by: Jonathan Kim <jonathan.kim@amd.com>
Reviewed-by: Graham Sider <graham.sider@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org # 6.1.x
Causes flickering or white screens in some configurations.
Disable it for now until we can fix the issue.
Cc: roman.li@amd.com
Cc: yifan1.zhang@amd.com
Acked-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Roman Li <Roman.Li@amd.com>
Reviewed-by: Yifan Zhang <yifan1.zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org # 6.1.x
Always enable multipipe policy on ASICs with GC VERSION > 9.0.0
instead of MEC number > 1.
This will allow multipipe policy on ASICs with one MEC,
e.g., gfx11 APUs.
Signed-off-by: Lang Yu <Lang.Yu@amd.com>
Reviewed-by: Aaron Liu <aaron.liu@amd.com>
Reviewed-by: Yifan Zhang <yifan1.zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org # 6.1.x
There is only one MEC on these APUs.
Signed-off-by: Lang Yu <Lang.Yu@amd.com>
Reviewed-by: Aaron Liu <aaron.liu@amd.com>
Reviewed-by: Yifan Zhang <yifan1.zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org # 6.1.x
Currently, we run into a number of WARN()s when attempting to unload the
amdgpu driver (e.g. using "modprobe -r amdgpu"). These all stem from
calling drm_encoder_cleanup() too early. So, to fix this we can stop
calling drm_encoder_cleanup() from amdgpu_dm_fini() and instead have it
be called from amdgpu_dm_encoder_destroy(). Also, we don't need to free
in amdgpu_dm_encoder_destroy() since mst_encoders[] isn't explicitly
allocated by the slab allocator.
Fixes: f74367e492 ("drm/amdgpu/display: create fake mst encoders ahead of time (v4)")
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
It can be that neither fence were initialized when we run out of UVD
streams for example.
v2: fix typo breaking compile
Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/2324
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org # 6.1.x
The YCC conversion matrix for RGB -> COLOR_SPACE_YCBCR2020_TYPE is
missing the values for the fourth column of the matrix.
The fourth column of the matrix is essentially just a value that is
added given that the color is 3 components in size.
These values are needed to bias the chroma from the [-1, 1] -> [0, 1]
range.
This fixes color being very green when using Gamescope HDR on HDMI
output which prefers YCC 4:4:4.
Fixes: 40df2f809e ("drm/amd/display: color space ycbcr709 support")
Reviewed-by: Melissa Wen <mwen@igalia.com>
Signed-off-by: Joshua Ashton <joshua@froggi.es>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Code in get_output_color_space depends on knowing the pixel encoding to
determine whether to pick between eg. COLOR_SPACE_SRGB or
COLOR_SPACE_YCBCR709 for transparent RGB -> YCbCr 4:4:4 in the driver.
v2: Fixed patch being accidentally based on a personal feature branch, oops!
Fixes: ea117312ea ("drm/amd/display: Reduce HDMI pixel encoding if max clock is exceeded")
Reviewed-by: Melissa Wen <mwen@igalia.com>
Signed-off-by: Joshua Ashton <joshua@froggi.es>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
We need to reset this or otherwise run into list corruption later on.
Fixes: e44a0fe630 ("drm/amdgpu: rework reserved VMID handling")
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Tested-by: Candice Li <candice.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
From smu firmware,the value of power is transferred in units of watts.
Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/2321
Fixes: 137aac26a2 ("drm/amdgpu/smu12: fix power reporting on renoir")
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Jesse Zhang <Jesse.Zhang@amd.com>
Reviewed-by: Aaron Liu <aaron.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
[Why]
Setting scaling does not correctly update CRTC state. As a result
dc stream state's src (composition area) && dest (addressable area)
was not calculated as expected. This causes set scaling doesn's work.
[How]
Correctly update CRTC state when setting scaling property.
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Tested-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: hongao <hongao@uniontech.com>
Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
amd-drm-fixes-6.2-2023-01-11:
amdgpu:
- SMU13 fan speed fix
- SMU13 fix power cap handling
- SMU13 BACO fix
- Fix a possible segfault in bo validation error case
- Delay removal of firmware framebuffer
- Fix error when unloading
amdkfd:
- SVM fix when clearing vram
- GC11 fix for multi-GPU
Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230112033004.8184-1-alexander.deucher@amd.com
another orientation quirk for a Lenovo device, a use-after-free fix for
virtio, a regression fix in TTM and a performance regression in drm
buddy.
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Merge tag 'drm-misc-fixes-2023-01-12' of git://anongit.freedesktop.org/drm/drm-misc into drm-fixes
Several fixes for amdgpu (all addressing issues with fences), yet
another orientation quirk for a Lenovo device, a use-after-free fix for
virtio, a regression fix in TTM and a performance regression in drm
buddy.
Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20230112130954.pxt77g3a7rokha42@houat
The point bo->kfd_bo is NULL for queue's write pointer BO
when creating queue on mGPU. To avoid using the pointer
fixes the error.
Signed-off-by: Eric Huang <jinhuieric.huang@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This leverages the logic in smu11. No need to talk to SMU to
check BACO enablement as it's in BACO state already.
Signed-off-by: Guchun Chen <guchun.chen@amd.com>
Reviewed-by: Kenneth Feng <kenneth.feng@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org # 6.0, 6.1
There will be data corruption on vram allocated by svm
if the initialization is not complete and application is
writting on the memory. Adding sync to wait for the
initialization completion is to resolve this issue.
Signed-off-by: Eric Huang <jinhuieric.huang@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Removing the firmware framebuffer from the driver means that even
if the driver doesn't support the IP blocks in a GPU it will no
longer be functional after the driver fails to initialize.
This change will ensure that unsupported IP blocks at least cause
the driver to work with the EFI framebuffer.
Cc: stable@vger.kernel.org
Suggested-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Fix potential NULL dereference, in the case when "man", the resource manager
might be NULL, when/if we print debug information.
Cc: Alex Deucher <Alexander.Deucher@amd.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: AMD Graphics <amd-gfx@lists.freedesktop.org>
Cc: Dan Carpenter <error27@gmail.com>
Cc: kernel test robot <lkp@intel.com>
Fixes: 7554886daa ("drm/amdgpu: Fix size validation for non-exclusive domains (v4)")
Signed-off-by: Luben Tuikov <luben.tuikov@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
drm_sched_job_add_dependency() consumes the references of the gang
members. Only triggered by mesh shaders.
Signed-off-by: Christian König <christian.koenig@amd.com>
Fixes: 1728baa7e4 ("drm/amdgpu: use scheduler dependencies for CS")
Tested-by: Mike Lothian <mike@fireburn.co.uk>
Tested-by: Bert Karwatzki <spasswolf@web.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20230105111703.52695-1-christian.koenig@amd.com
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Luben Tuikov <luben.tuikov@amd.com>
Then we are able to set a new ppt limit via the hwmon interface(power1_cap).
Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org # 6.0.x, 6.1.x
Correct the reference clock as 25Mhz for SMU13 fan speed calculation.
Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org # 6.0.x, 6.1.x
This reverts commit de05abe6b9.
The bug referenced below was bisected to this commit. There has been no
activity toward fixing it in 3 months, so let's revert for now.
Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/2162
Signed-off-by: Michel Dänzer <mdaenzer@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
[Why]
SwathSizePerSurfaceY[] and SwathSizePerSurfaceC[] values are uninitialized
because we are using += instead of = operator.
[How]
Assign values in loop with = operator.
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Samson Tam <samson.tam@amd.com>
Reviewed-by: Aric Cyr <aric.cyr@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org # 6.0.x, 6.1.x
- Add ACPI IRQ override quirks for Asus ExpertBook B2502, Lenovo
14ALC7, and XMG Core 15 (Hans de Goede, Adrian Freund, Erik
Schumacher).
- Adjust ACPI video detection fallback path to prevent non-operational
ACPI backlight devices from being created on systems where the native
driver does not detect a suitable panel (Mario Limonciello).
- Fix Apple GMUX backlight detection (Hans de Goede).
- Add a low-power S0 idle (S0ix) handling quirk for HP Elitebook 865
and stop using AMD-specific low-power S0 idle code path for systems
with Rembrandt chips and newer (Mario Limonciello).
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Merge tag 'acpi-6.2-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull ACPI fixes from Rafael Wysocki:
"These are new ACPI IRQ override quirks, low-power S0 idle (S0ix)
support adjustments and ACPI backlight handling fixes, mostly for
platforms using AMD chips.
Specifics:
- Add ACPI IRQ override quirks for Asus ExpertBook B2502, Lenovo
14ALC7, and XMG Core 15 (Hans de Goede, Adrian Freund, Erik
Schumacher).
- Adjust ACPI video detection fallback path to prevent
non-operational ACPI backlight devices from being created on
systems where the native driver does not detect a suitable panel
(Mario Limonciello).
- Fix Apple GMUX backlight detection (Hans de Goede).
- Add a low-power S0 idle (S0ix) handling quirk for HP Elitebook 865
and stop using AMD-specific low-power S0 idle code path for systems
with Rembrandt chips and newer (Mario Limonciello)"
* tag 'acpi-6.2-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
ACPI: x86: s2idle: Stop using AMD specific codepath for Rembrandt+
ACPI: x86: s2idle: Force AMD GUID/_REV 2 on HP Elitebook 865
ACPI: video: Fix Apple GMUX backlight detection
ACPI: resource: Add Asus ExpertBook B2502 to Asus quirks
ACPI: resource: do IRQ override on Lenovo 14ALC7
ACPI: resource: do IRQ override on XMG Core 15
ACPI: video: Don't enable fallback path for creating ACPI backlight by default
drm/amd/display: Report to ACPI video if no panels were found
ACPI: video: Allow GPU drivers to report no panels
On desktop APUs amdgpu doesn't create a native backlight device
as no eDP panels are found. However if the BIOS has reported
backlight control methods in the ACPI tables then an acpi_video0
backlight device will be made 8 seconds after boot.
This has manifested in a power slider on a number of desktop APUs
ranging from Ryzen 5000 through Ryzen 7000 on various motherboard
manufacturers. To avoid this, report to the acpi video detection
that the system does not have any panel connected in the native
driver.
Link: https://bugzilla.redhat.com/show_bug.cgi?id=1783786
Reported-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
That function consumes the reference.
Reviewed-by: Luben Tuikov <luben.tuikov@amd.com>
Reported-by: Borislav Petkov (AMD) <bp@alien8.de>
Tested-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: Christian König <christian.koenig@amd.com>
Fixes: aab9cf7b69 ("drm/amdgpu: use scheduler dependencies for VM updates")
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Alex Deucher