kernel/linux.git/drivers/gpu/drm/tegra/dp.c, branch v6.12.80

drm: Rename dp/ to display/

2022-04-25T09:17:45+00:00

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 Reviewed-by: Lyude Paul Reviewed-by: Javier Martinez Canillas Reviewed-by: Alex Deucher Link: https://patchwork.freedesktop.org/patch/msgid/20220421073108.19226-3-tzimmermann@suse.de

drm/dp: Fix OOB read when handling Post Cursor2 register

2022-02-25T09:24:20+00:00

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 Cc: Maarten Lankhorst Cc: Maxime Ripard Cc: Thomas Zimmermann Cc: David Airlie Cc: dri-devel@lists.freedesktop.org Fixes: 79465e0ffeb9 ("drm/dp: Add helper to get post-cursor adjustments") Signed-off-by: Kees Cook Reviewed-by: Gustavo A. R. Silva Reviewed-by: Jani Nikula Link: https://lore.kernel.org/r/20220105173507.2420910-1-keescook@chromium.org Signed-off-by: Thierry Reding

drm/dp: Move public DisplayPort headers into dp/

2022-01-17T10:25:44+00:00

Move all public DisplayPort headers into dp/ and update users. No functional changes. v3: * rebased onto latest drm-tip Signed-off-by: Thomas Zimmermann Acked-by: Daniel Vetter Link: https://patchwork.freedesktop.org/patch/msgid/20220114114535.29157-5-tzimmermann@suse.de

drm/tegra: sor: Add DisplayPort support

2019-10-28T10:18:54+00:00

Add support for regular DisplayPort on Tegra210 and Tegra186. Signed-off-by: Thierry Reding

drm/tegra: dp: Add DisplayPort link training helper

2019-10-28T10:18:53+00:00

Add a helper that will perform link training as described in the DisplayPort specification. Signed-off-by: Thierry Reding

drm/tegra: dp: Add support for eDP link rates

2019-10-28T10:18:53+00:00

Parses additional link rates from DPCD if the sink supports eDP 1.4. Signed-off-by: Thierry Reding

drm/tegra: dp: Add drm_dp_link_choose() helper

2019-10-28T10:18:52+00:00

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

drm/tegra: dp: Enable alternate scrambler reset when supported

2019-10-28T10:18:52+00:00

If the sink is eDP and supports the alternate scrambler reset, enable it. Signed-off-by: Thierry Reding

drm/tegra: dp: Set channel coding on link configuration

2019-10-28T10:18:52+00:00

Make use of ANSI 8B/10B channel coding if the DisplayPort sink supports it. Signed-off-by: Thierry Reding

drm/tegra: dp: Read AUX read interval from DPCD

2019-10-28T10:18:52+00:00

Store the AUX read interval from DPCD, so that it can be used to wait for the durations given in the specification during link training. Signed-off-by: Thierry Reding