On 05/31/2017 01:57 AM, Clint Taylor wrote:
On 05/26/2017 12:18 AM, Daniel Vetter wrote:
On Thu, May 25, 2017 at 05:06:25PM +0200, Hans Verkuil wrote:
From: Hans Verkuil <hans.verkuil@xxxxxxxxx>
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@xxxxxxxxx>
---
drivers/gpu/drm/Kconfig | 3 +
drivers/gpu/drm/Makefile | 1 +
drivers/gpu/drm/drm_dp_cec.c | 196 +++++++++++++++++++++++++++++++++++++++++++
include/drm/drm_dp_helper.h | 24 ++++++
4 files changed, 224 insertions(+)
create mode 100644 drivers/gpu/drm/drm_dp_cec.c
diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index 78d7fc0ebb57..dd771ce8a3d0 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -120,6 +120,9 @@ config DRM_LOAD_EDID_FIRMWARE
default case is N. Details and instructions how to build your own
EDID data are given in Documentation/EDID/HOWTO.txt.
+config DRM_DP_CEC
+ bool
We generally don't bother with a Kconfig for every little bit in drm, not
worth the trouble (yes I know there's some exceptions, but somehow they're
all from soc people). Just smash this into the KMS_HELPER one and live is
much easier for drivers. Also allows you to drop the dummy inline
functions.
All of the functions like cec_register_adapter() require
CONFIG_MEDIA_CEC_SUPPORT.
This will add a new dependency to the DRM drivers. All instances of
CONFIG_DRM_DP_CEC should be changed to CONFIG_MEDIA_CEC_SUPPORT so drm
can still be used without the media CEC drivers.
This has changed in the next version. I realized the same thing and there
are CEC core patches pending for 4.12 to solve this.
I plan on posting a new patch series for this later this week, and that
will include those patches for 4.12 so it is easier to test this.
Regards,
Hans
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