[03/14] drm/amd/display: Add execution and transition states for HDCP2.2

[Nathan Chancellor]

On Thu, Nov 07, 2019 at 10:56:17AM -0500, Bhawanpreet Lakha wrote:
> The module works like a state machine
> 
>                                     +-------------+
>                             ------> | Execution.c | ------
>                             |       +-------------+       |
>                             |                             V
>     +----+              +--------+                 +--------------+
>     | DM |    ----->    | Hdcp.c |  <------------  | Transition.c |
>     +----+    <-----    +--------+                 +--------------+
> 
> This patch adds the execution and transition files for 2.2
> 
> Extension to "40a702d427 drm/amd/display: Add HDCP module" for 2.2
> 
> Signed-off-by: Bhawanpreet Lakha <Bhawanpreet.Lakha at amd.com>

The version of this patch in linux-next, 51466b3fd272 ("drm/amd/display:
Add execution and transition states for HDCP2.2") causes the following
error on arm32:

arm-linux-gnueabi-ld: drivers/gpu/drm/amd/display/modules/hdcp/hdcp2_execution.o: in function `locality_check':
hdcp2_execution.c:(.text+0xd2c): undefined reference to `__bad_udelay'
arm-linux-gnueabi-ld: drivers/gpu/drm/amd/display/modules/hdcp/hdcp2_execution.o: in function `poll_l_prime_available':
hdcp2_execution.c:(.text+0xe64): undefined reference to `__bad_udelay'

There is a limit of 2000us delays on arm:
https://elixir.bootlin.com/linux/v5.3.12/source/arch/arm/include/asm/delay.h#L60

If this function doesn't run in an atomic context, I assume msleep
should work.

Cheers,
Nathan