drm/amd/display: Modify comments to match the code

[Kazlauskas, Nicholas]

On 2019-11-26 9:46 a.m., Zhan liu wrote:
> [Why]
> This line of code was modified. However, comments
> remained unchanged. As a result, comments and code are
> mismatching.
> 
> [How]
> Modifying comments to reflect code. At the same time,
> explaining why the value was changed from 200ms to
> 3000ms.
> 
> Signed-off-by: Zhan Liu <zhan.liu at amd.com>

Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas at amd.com>

> ---
>   drivers/gpu/drm/amd/display/dc/dc_helper.c | 7 ++++++-
>   1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/amd/display/dc/dc_helper.c b/drivers/gpu/drm/amd/display/dc/dc_helper.c
> index 8da4576e2908..e41befa067ce 100644
> --- a/drivers/gpu/drm/amd/display/dc/dc_helper.c
> +++ b/drivers/gpu/drm/amd/display/dc/dc_helper.c
> @@ -485,7 +485,12 @@ void generic_reg_wait(const struct dc_context *ctx,
>   		return;
>   	}
>   
> -	/* something is terribly wrong if time out is > 200ms. (5Hz) */
> +	/*
> +	 * Something is terribly wrong if time out is > 3000ms.
> +	 * 3000ms is the maximum time needed for SMU to pass values back.
> +	 * This value comes from experiments.
> +	 *
> +	 */
>   	ASSERT(delay_between_poll_us * time_out_num_tries <= 3000000);
>   
>   	for (i = 0; i <= time_out_num_tries; i++) {
>