kernel/linux.git/drivers/gpu/drm/tegra/dp.c, branch v6.18.22Linux kernel stable tree (mirror)https://git.radix-linux.su/kernel/linux.git/atom?h=v6.18.222025-04-02T14:41:27+00:00drm/dp: Pull drm_dp_link_power_up/down from Tegra to common drm_dp_helper2025-04-02T14:41:27+00:00Andy Yanandy.yan@rock-chips.com2025-03-18T06:34:35+00:00urn:sha1:09cdda7a60f45784cebddf1fa2109d6279f9890b
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 <andy.yan@rock-chips.com>
Acked-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20250318063452.4983-1-andyshrk@163.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
drm: Rename dp/ to display/2022-04-25T09:17:45+00:00Thomas Zimmermanntzimmermann@suse.de2022-04-21T07:31:02+00:00urn:sha1:da68386d9edb1f57abf886febe5c5169ebd4d2c9
Rename dp/ to display/ to account for additional display-related
helpers, such as HDMI. Update all related include statements. No
functional changes.
Various drivers, such as i915 and amdgpu, use similar naming scheme
by putting code for video-output standards into a local display/
directory. The new directory's name is aligned with this convention.
v2:
* update commit message (Javier)
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220421073108.19226-3-tzimmermann@suse.de
drm/dp: Fix OOB read when handling Post Cursor2 register2022-02-25T09:24:20+00:00Kees Cookkeescook@chromium.org2022-02-25T03:56:10+00:00urn:sha1:a2151490cc6c57b368d7974ffd447a8b36ade639
The link_status array was not large enough to read the Adjust Request
Post Cursor2 register, so remove the common helper function to avoid
an OOB read, found with a -Warray-bounds build:
drivers/gpu/drm/drm_dp_helper.c: In function 'drm_dp_get_adjust_request_post_cursor':
drivers/gpu/drm/drm_dp_helper.c:59:27: error: array subscript 10 is outside array bounds of 'const u8[6]' {aka 'const unsigned char[6]'} [-Werror=array-bounds]
59 | return link_status[r - DP_LANE0_1_STATUS];
| ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
drivers/gpu/drm/drm_dp_helper.c:147:51: note: while referencing 'link_status'
147 | u8 drm_dp_get_adjust_request_post_cursor(const u8 link_status[DP_LINK_STATUS_SIZE],
| ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Replace the only user of the helper with an open-coded fetch and decode,
similar to drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c.
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: David Airlie <airlied@linux.ie>
Cc: dri-devel@lists.freedesktop.org
Fixes: 79465e0ffeb9 ("drm/dp: Add helper to get post-cursor adjustments")
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Link: https://lore.kernel.org/r/20220105173507.2420910-1-keescook@chromium.org
Signed-off-by: Thierry Reding <treding@nvidia.com>
drm/dp: Move public DisplayPort headers into dp/2022-01-17T10:25:44+00:00Thomas Zimmermanntzimmermann@suse.de2022-01-14T11:45:34+00:00urn:sha1:5b529e8d9c387a34ca2b8008dc65f55d539b3ef6
Move all public DisplayPort headers into dp/ and update users. No
functional changes.
v3:
* rebased onto latest drm-tip
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Daniel Vetter <daniel@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20220114114535.29157-5-tzimmermann@suse.de
drm/tegra: sor: Add DisplayPort support2019-10-28T10:18:54+00:00Thierry Redingtreding@nvidia.com2019-10-15T12:59:37+00:00urn:sha1:0472c21b83192c61dbac7ba98abe8decacbd1d59
Add support for regular DisplayPort on Tegra210 and Tegra186.
Signed-off-by: Thierry Reding <treding@nvidia.com>
drm/tegra: dp: Add DisplayPort link training helper2019-10-28T10:18:53+00:00Thierry Redingtreding@nvidia.com2015-07-07T19:21:48+00:00urn:sha1:078c445733c1e8092e23391b251cad6b12f6156e
Add a helper that will perform link training as described in the
DisplayPort specification.
Signed-off-by: Thierry Reding <treding@nvidia.com>
drm/tegra: dp: Add support for eDP link rates2019-10-28T10:18:53+00:00Thierry Redingtreding@nvidia.com2018-02-01T16:46:42+00:00urn:sha1:6a127160c4883abf3a54d97024eda8118849fd5c
Parses additional link rates from DPCD if the sink supports eDP 1.4.
Signed-off-by: Thierry Reding <treding@nvidia.com>
drm/tegra: dp: Add drm_dp_link_choose() helper2019-10-28T10:18:52+00:00Thierry Redingtreding@nvidia.com2015-07-21T14:38:11+00:00urn:sha1:01f09f242eb5cb194a88cef669a099fa10fcb3f0
This helper chooses an appropriate configuration, according to the
bitrate requirements of the video mode and the capabilities of the
DisplayPort sink.
Signed-off-by: Thierry Reding <treding@nvidia.com>
drm/tegra: dp: Enable alternate scrambler reset when supported2019-10-28T10:18:52+00:00Thierry Redingtreding@nvidia.com2015-07-07T19:14:12+00:00urn:sha1:c4a27288520d35e7e6acc6e36fba4585e1bddde6
If the sink is eDP and supports the alternate scrambler reset, enable
it.
Signed-off-by: Thierry Reding <treding@nvidia.com>
drm/tegra: dp: Set channel coding on link configuration2019-10-28T10:18:52+00:00Thierry Redingtreding@nvidia.com2015-06-10T14:35:44+00:00urn:sha1:553769ff8d8c452cc81a5fe5b0a68cc456c31db3
Make use of ANSI 8B/10B channel coding if the DisplayPort sink supports
it.
Signed-off-by: Thierry Reding <treding@nvidia.com>