linux.git/drivers/gpu/drm/tegra, branch v6.16

drm/tegra: nvdec: Fix dma_alloc_coherent error check

2025-07-04T09:15:07+00:00

Check for NULL return value with dma_alloc_coherent, in line with
Robin's fix for vic.c in 'drm/tegra: vic: Fix DMA API misuse'.

Fixes: 46f226c93d35 ("drm/tegra: Add NVDEC driver")
Signed-off-by: Mikko Perttunen 
Signed-off-by: Thierry Reding 
Link: https://lore.kernel.org/r/20250702-nvdec-dma-error-check-v1-1-c388b402c53a@nvidia.com

drm/tegra: Fix a possible null pointer dereference

2025-05-07T16:07:27+00:00

In tegra_crtc_reset(), new memory is allocated with kzalloc(), but
no check is performed. Before calling __drm_atomic_helper_crtc_reset,
state should be checked to prevent possible null pointer dereference.

Fixes: b7e0b04ae450 ("drm/tegra: Convert to using __drm_atomic_helper_crtc_reset() for reset.")
Cc: stable@vger.kernel.org
Signed-off-by: Qiu-ji Chen 
Signed-off-by: Thierry Reding 
Link: https://lore.kernel.org/r/20241106095906.15247-1-chenqiuji666@gmail.com

drm/tegra: rgb: Fix the unbound reference count

2025-05-07T16:06:14+00:00

The of_get_child_by_name() increments the refcount in tegra_dc_rgb_probe,
but the driver does not decrement the refcount during unbind. Fix the
unbound reference count using devm_add_action_or_reset() helper.

Fixes: d8f4a9eda006 ("drm: Add NVIDIA Tegra20 support")
Signed-off-by: Biju Das 
Signed-off-by: Thierry Reding 
Link: https://lore.kernel.org/r/20250205112137.36055-1-biju.das.jz@bp.renesas.com

drm/tegra: falcon: Pipeline firmware copy

2025-05-07T15:47:36+00:00

The Falcon DMA engine allows queueing multiple operations for
improved performance. Do this to optimize firmware loading.
A performance improvement of 4x to 6x is observed.

Co-developed-by: Ivan Raul Guadarrama 
Signed-off-by: Ivan Raul Guadarrama 
Signed-off-by: Mikko Perttunen 
Signed-off-by: Thierry Reding 
Link: https://lore.kernel.org/r/20250205061027.1205748-1-mperttunen@nvidia.com

drm/tegra: dpaux: Use dev_err_probe()

2025-05-07T15:44:03+00:00

Replace the open-code with dev_err_probe() to simplify the code.

Signed-off-by: Zhang Enpei 
Signed-off-by: Shao Mingyin 
Signed-off-by: Thierry Reding 
Link: https://lore.kernel.org/r/20250402193758365XauggSF2EWBYY-e_jgNch@zte.com.cn

drm/tegra: Remove unneeded include

2025-05-07T15:25:22+00:00

The header file 'tegra_drm.h' is included in gem.c, but this file is
already include 'drm.h'. Although there is no harm in including this
file again, it is also not necessary. Furthermore, the header file is
located under 'include/uapi/drm' so ideally the full path would be
used to be explicit. For now, just remove from gem.c.

Signed-off-by: Jon Hunter 
Signed-off-by: Thierry Reding 
Link: https://lore.kernel.org/r/20250428153435.1013101-1-jonathanh@nvidia.com

drm/tegra: Assign plane type before registration

2025-05-07T15:16:56+00:00

Changes to a plane's type after it has been registered aren't propagated
to userspace automatically. This could possibly be achieved by updating
the property, but since we can already determine which type this should
be before the registration, passing in the right type from the start is
a much better solution.

Suggested-by: Aaron Kling 
Signed-off-by: Thierry Reding 
Cc: stable@vger.kernel.org
Fixes: 473079549f27 ("drm/tegra: dc: Add Tegra186 support")
Signed-off-by: Aaron Kling 
Signed-off-by: Thierry Reding 
Link: https://lore.kernel.org/r/20250421-tegra-drm-primary-v2-1-7f740c4c2121@gmail.com

drm/dp: Pull drm_dp_link_power_up/down from Tegra to common drm_dp_helper

2025-04-02T14:41:27+00:00

The helper functions drm_dp_link_power_up/down were moved to Tegra
DRM in commit 9a42c7c647a9 ("drm/tegra: Move drm_dp_link helpers to Tegra DRM")".

Now since more and more users are duplicating the same code in their
own drivers, it's time to make them as DRM DP common helpers again.

Signed-off-by: Andy Yan 
Acked-by: Dmitry Baryshkov 
Link: https://lore.kernel.org/r/20250318063452.4983-1-andyshrk@163.com
Signed-off-by: Dmitry Baryshkov

drm/tegra: move to devm_platform_ioremap_resource() usage

2025-03-06T17:37:53+00:00

Replace platform_get_resource + devm_ioremap_resource
with just devm_platform_ioremap_resource()

Used Coccinelle to do this change. SmPl patch:
@rule_1@
identifier res;
expression ioremap_res;
identifier pdev;
@@
-struct resource *res;
...
-res = platform_get_resource(pdev,...);
-ioremap_res = devm_ioremap_resource(...);
+ioremap_res = devm_platform_ioremap_resource(pdev,0);

Cc: Thierry Reding 
Cc: Mikko Perttunen 
Reviewed-by: Maxime Ripard 
Signed-off-by: Anusha Srivatsa 
Link: https://patchwork.freedesktop.org/patch/640855/?series=144073&rev=5

drm/atomic: Let drivers decide which planes to async flip

2025-02-13T22:54:29+00:00

Currently, DRM atomic uAPI allows only primary planes to be flipped
asynchronously. However, each driver might be able to perform async
flips in other different plane types. To enable drivers to set their own
restrictions on which type of plane they can or cannot flip, use the
existing atomic_async_check() from struct drm_plane_helper_funcs to
enhance this flexibility, thus allowing different plane types to be able
to do async flips as well.

Create a new parameter for the atomic_async_check(), `bool flip`. This
parameter is used to distinguish when this function is being called from
a plane update from a full page flip.

In order to prevent regressions and such, we keep the current policy: we
skip the driver check for the primary plane, because it is always
allowed to do async flips on it.

Signed-off-by: André Almeida 
Reviewed-by: Dmitry Baryshkov 
Reviewed-by: Christopher Snowhill 
Tested-by: Christopher Snowhill 
Link: https://patchwork.freedesktop.org/patch/msgid/20250127-tonyk-async_flip-v12-1-0f7f8a8610d3@igalia.com
Signed-off-by: Dmitry Baryshkov