linux-dev/drivers/gpu/drm/amd/display/dc/hdcp, branch master

drm/amd/display: Enforce DPCD Address ranges

2021-06-15T21:25:41Z

[WHY] Some DPCD addresses, notably LTTPR Capability registers, are expected to be read all together in a single DPCD transaction. Rather than force callers to read registers they don't need, we want to quietly extend the addresses read, and only return back the values the caller asked for. This does not affect DPCD writes. [HOW] Create an additional layer above AUX to perform 'checked' DPCD transactions. Iterate through an array of DPCD address ranges that are marked as being contiguous. If a requested read falls within one of those ranges, extend the read to include the entire range. After DPCD has been queried, copy the requested bytes into the caller's data buffer, and deallocate all resources used. Signed-off-by: Wesley Chalmers Reviewed-by: Jun Lei Acked-by: Anson Jacob Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher

drm/amd/display: Fix off by one in hdmi_14_process_transaction()

2021-03-03T15:51:37Z

The hdcp_i2c_offsets[] array did not have an entry for HDCP_MESSAGE_ID_WRITE_CONTENT_STREAM_TYPE so it led to an off by one read overflow. I added an entry and copied the 0x0 value for the offset from similar code in drivers/gpu/drm/amd/display/modules/hdcp/hdcp_ddc.c. I also declared several of these arrays as having HDCP_MESSAGE_ID_MAX entries. This doesn't change the code, but it's just a belt and suspenders approach to try future proof the code. Fixes: 4c283fdac08a ("drm/amd/display: Add HDCP module") Reviewed-by: Bhawanpreet Lakha Signed-off-by: Dan Carpenter Signed-off-by: Alex Deucher

drm/amd/display: query hdcp capability during link detect

2020-04-09T14:43:17Z

[Why] Query the hdcp caps of a link, it is useful and can be reported to the user [How] Create a query function and call it during link detect Signed-off-by: Bhawanpreet Lakha Reviewed-by: Rodrigo Siqueira Signed-off-by: Alex Deucher

drm/amd/display: remove redundant null pointer check before kfree

2019-10-30T15:07:13Z

kfree has taken null pointer into account. hence it is safe to remove the unnecessary check. Reviewed-by: Harry Wentland Signed-off-by: zhong jiang Signed-off-by: Alex Deucher

drm/amd/display: Add HDCP module

2019-10-03T14:10:58Z

This module manages HDCP for amdgpu driver. The module behaves as a state machine which handles the different authentication states of HDCP The module is divided into 3 major components +--------+ | Hdcp.c | +--------+ Manages the state machine, sends the events to be executed and communicates with the dm +-----------+ |Execution.c| +-----------+ This executes events based on the current state. Also generates execution results as transition inputs +------------+ |Transition.c| +------------+ Decides the next state based on the input and makes requests to hdcp.c to handle. +-------------+ ------> | Execution.c | ------ | +-------------+ | | V +----+ +--------+ +--------------+ | DM | -----> | Hdcp.c | <------------ | Transition.c | +----+ <----- +--------+ +--------------+ v2: Drop unused function definitions Signed-off-by: Bhawanpreet Lakha Signed-off-by: Wenjing Liu Reviewed-by: Wenjing Liu Acked-by: Harry Wentland Signed-off-by: Alex Deucher