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path: root/drivers/gpu/drm/drm_dp_cec.c
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2022-01-17drm/dp: Move DisplayPort helpers into separate helper moduleThomas Zimmermann
Move DisplayPort functions into a separate module to reduce the size of the KMS helpers. Select DRM_DP_HELPER for all users of the code. To avoid naming conflicts, rename drm_dp_helper.c to drm_dp.c This change can help to reduce the size of the kernel binary. Some numbers from a x86-64 test build: Before: drm_kms_helper.ko: 447480 bytes After: drm_dp_helper.ko: 216632 bytes drm_kms_helper.ko: 239424 bytes For early-boot graphics, generic DRM drivers, such as simpledrm, require DRM KMS helpers to be built into the kernel. Generic helper functions for DisplayPort take up a significant portion of DRM KMS helper library. These functions are not used by generic drivers and can be loaded as a module. v3: * fix include statement in DRM selftests v2: * move DP helper code into dp/ (Jani) Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Acked-by: Lyude Paul <lyude@redhat.com> Acked-by: Daniel Vetter <daniel@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20220114114535.29157-4-tzimmermann@suse.de
2019-10-08drm_dp_cec: drop use of drmP.hSam Ravnborg
drmP.h is deprecated and will be deleted. Replace use with proper header. Divide header includes in blocks while touching these. Build tested with various archtectures and configs. Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Fixes: ae85b0df124f6928 ("drm_dp_cec: add connector info support.") Reviewed-by: Lyude Paul <lyude@redhat.com> Reviewed-by: Sean Paul <sean@poorly.run> Acked-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Cc: Dariusz Marcinkiewicz <darekm@google.com> Cc: Ben Skeggs <bskeggs@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20191007171224.1581-2-sam@ravnborg.org
2019-08-27drm_dp_cec: add connector info support.Dariusz Marcinkiewicz
Pass the connector info to the CEC adapter. This makes it possible to associate the CEC adapter with the corresponding drm connector. Signed-off-by: Dariusz Marcinkiewicz <darekm@google.com> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Tested-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Reviewed-by: Lyude Paul <lyude@redhat.com> Reviewed-by: Ben Skeggs <bskeggs@redhat.com> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Link: https://patchwork.freedesktop.org/patch/msgid/20190814104520.6001-2-darekm@google.com
2018-10-11drm: Do not call drm_dp_cec_set_edid() while registering DP connectorsJosé Roberto de Souza
drm_dp_cec_register_connector() is called when registering each DP connector in DRM, while sounds a good idea register CEC adapters as earlier as possible, it causes some driver initialization delay trying to do DPCD transactions in disconnected connectors. This change will cause no regressions as drm_dp_cec_set_edid() will still be called in further detection of connected connectors with a valid edid parameter. This change reduced the module load of i915 by average 0.5sec in a machine with just one DP port disconnected while reducing more than 3sec in a machine with 4 DP ports disconnected. Cc: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: José Roberto de Souza <jose.souza@intel.com> Acked-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20181011004439.4482-1-jose.souza@intel.com
2018-08-31drm_dp_cec: add note about good MegaChips 2900 CEC supportHans Verkuil
A big problem with DP CEC-Tunneling-over-AUX is that it is tricky to find adapters with a chipset that supports this AND where the manufacturer actually connected the HDMI CEC line to the chipset. Add a mention of the MegaChips 2900 chipset which seems to support this feature well. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Reviewed-by: Lyude Paul <lyude@redhat.com> Acked-by: Alex Deucher <alexander.deucher@amd.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180827075820.41109-3-hverkuil@xs4all.nl
2018-08-31drm_dp_cec: check that aux has a transfer functionHans Verkuil
If aux->transfer == NULL, then just return without doing anything. In that case the function is likely called for a non-(e)DP connector. This never happened for the i915 driver, but the nouveau and amdgpu drivers need this check. The alternative would be to add this check in those drivers before every drm_dp_cec call, but it makes sense to check it in the drm_dp_cec functions to prevent a kernel oops. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Reviewed-by: Lyude Paul <lyude@redhat.com> Acked-by: Alex Deucher <alexander.deucher@amd.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180827075820.41109-2-hverkuil@xs4all.nl
2018-07-28drm_dp_cec.c: fix formatting typo: %pdH -> %phDHans Verkuil
This caused a kernel oops since %pdH interpreted the pointer as a struct file. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.com> Link: https://patchwork.freedesktop.org/patch/msgid/f3720ddf-ec0f-cd22-46b6-720a5e2098f2@xs4all.nl
2018-07-13drm: add support for DisplayPort CEC-Tunneling-over-AUXHans Verkuil
This adds support for the DisplayPort CEC-Tunneling-over-AUX feature that is part of the DisplayPort 1.3 standard. Unfortunately, not all DisplayPort/USB-C to HDMI adapters with a chip that has this capability actually hook up the CEC pin, so even though a CEC device is created, it may not actually work. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180711132909.25409-2-hverkuil@xs4all.nl